BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Constraints on neutron skin thickness and symmetry energy DTSTART;VALUE=DATE-TIME:20241024T081500Z DTEND;VALUE=DATE-TIME:20241024T083000Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4418@cern.ch DESCRIPTION:Speakers: Nikolay Arsenyev (Bogoliubov Laboratory of Theoretic al Physic\, Joint Institute for Nuclear Research)\nThe structure of exotic neutron-rich nuclei is one of the main science drivers in contemporary nu clear physics research [1]. The new measurements of pygmy dipole (PDR) and giant dipole (GDR) resonances in neutron-rich nuclei have sparked advance ments in nuclear models. The quasiparticle random phase approximation\, ut ilizing the self-consistent mean-field derived from Skyrme effective inter actions\, is a widely used tool for describing the PDR and GDR. This appro ach made it possible to a successful description of the properties of low- lying states and the characteristics of giant multipole resonances in sphe rical nuclei [2\,3].\nDue to the anharmonicity of vibrations there is a co upling between simple particle-hole configurations and more complex states [4\,5]. As an illustration\, we study the properties of the low-lying dip ole states in the neutron-rich Ca and Ni isotopes [6\,7]. This reveals a n umber of characteristic features of the low-energy E1 modes. The effect of the low-energy E1 strength on the electric dipole polarizability is discu ssed [5]. The correlations between the electric dipole polarizability\, th e symmetry energy\, and neutron skin thickness are studied [8].\nThe resea rch was supported within the framework of the scientific program of the Na tional Center for Physics and Mathematics\, topic no. 6 “Nuclear and Rad iation Physics” (stage 2023-2025).\n\n[1] A. Zilges\, D.L. Balabanski\, J. Isaak\, and N. Pietralla\, Prog. Part. Nucl. Phys. 122\, 103903 (2022). \n[2] N. Paar\, D. Vretenar\, E. Khan\, and G. Colò\, Rep. Progr. Phys. 7 0\, 691 (2007).\n[3] E.G. Lanza\, L. Pellegri\, A. Vitturi\, and M.V. Andr és\, Prog. Part. Nucl. Phys. 129\, 104006 (2023).\n[4] V.G. Soloviev\, Th eory of Atomic Nuclei: Quasiparticles and Phonons. Bristol/Philadelphia 19 92.\n[5] A.P. Severyukhin\, N.N. Arsenyev\, and N. Pietralla\, Phys. Rev. C. 104\, 024310 (2021).\n[6] N.N. Arsenyev\, A.P. Severyukhin\, V.V. Voron ov\, and N.V. Giai\, Phys. Rev. C. 95\, 054312 (2017).\n[7] N.N. Arsenyev\ , A.P. Severyukhin\, V.V. Voronov\, and N.V. Giai\, Phys. Part. Nucl. 50\, 528 (2019).\n[8] N.N. Arsenyev\, and A.P. Severyukhin\, Moscow Univ. Phys . Bull. 79\, 200 (2024).\n\nhttps://indico.particle.mephi.ru/event/436/con tributions/4418/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4418/ END:VEVENT BEGIN:VEVENT SUMMARY:Resonant states of muonic three-particle systems with lithium\, he lium and hydrogen nuclei DTSTART;VALUE=DATE-TIME:20241024T080000Z DTEND;VALUE=DATE-TIME:20241024T081500Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4182@cern.ch DESCRIPTION:Speakers: Alexey Eskin (Samara University)\nMuonic molecular i ons He-p-µ and Li-p-µ are studied numerically in the variational approac h. Using the complex coordinate rotation method we calculate energies of r esonant states. These molecular systems may be of interest for studying lo w-energy fusion reactions.\n\nhttps://indico.particle.mephi.ru/event/436/c ontributions/4182/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4182/ END:VEVENT BEGIN:VEVENT SUMMARY:Low-energy spectra of nobelium isotopes: Skyrme random-phase-appro ximation analysis DTSTART;VALUE=DATE-TIME:20241024T074500Z DTEND;VALUE=DATE-TIME:20241024T080000Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4167@cern.ch DESCRIPTION:Speakers: Mariia Mardyban ()\nThe low-energy multipole spectru m in isotopes 250-260No is investigated in the framework of fully self-c onsistent Quasiparticle-Random-Phase-Approximation (QRPA) method with Skyr me forces [1\,2]. The representative set of Skyrme parametrizations (SLy5 \, SLy6\, SkM* and SVbas) is applied. The main attention is paid to nuclei 252No and 254No\, where we have most of the experimental spectroscopic in formation [3\,4]. In addition to low-energy one-phonon collective states (lm=20\,22\,30\,31\,32) and their rotational band\, the isomeric states ar e inspected. In general\, a good agreement with the experimental data is o btained. Some K-isomers in these nuclei are inspected. It is shown that\, in the chain 250−260No\, features of 252No and 254No exhibit essential i rregularities caused by a shell gap in the neutron single-particle spectra and corresponding break of the neutron pairing. The low-energy pairing-vi brational Kπ = 0+ state is predicted.\n \n [1] P.-G. Reinhard\, B. Schuet rumpf\, and J. A. Maruhn\, Comp. Phys. Commun. 258\, 107603 (2021).\n\n[2] A. Repko\, J. Kvasil\, V.O. Nesterenko and P.-G. Reinhard\, arXiv:1510.0 1248[nucl-th]. \n\n[3] R.-D. Herzberg and P.T. Greenlees\, Prog. Part. Nuc l. Phys. 61\, 674 (2008).\n\n[4] R.-D. Herzberg\, arXiv:2309.10468[nucl-ex ].\n\n[5] F.L. Bello Garrote et all\, Phys. Lett. B834\, 137479 (2022).\n\ nhttps://indico.particle.mephi.ru/event/436/contributions/4167/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4167/ END:VEVENT BEGIN:VEVENT SUMMARY:THE ROLE OF QUARKS IN NUCLEAR STRUCTURE: ALPHA-CLUSTERING AND NUCL EOSYNTHESIS IN STARS DTSTART;VALUE=DATE-TIME:20241024T073000Z DTEND;VALUE=DATE-TIME:20241024T074500Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4171@cern.ch DESCRIPTION:Speakers: Genis Musulmanbekov (JINR)\nWe propose a quark model of nuclear structure where quark correlations lead to nucleon-nucleon cor relations and arrangement of them into lattice--like structure. The model is based on the quark model of nucleon structure in which valence quarks a re strongly correlated within a nucleon (SCQM) [1]. Nuclei are built by ju nctions of SU(3) color fields of two quarks of neighboring nucleons. Appli cation of the model to larger collections of nucleons reveals the emergenc e of the face-centered cubic (FCC) symmetry at a nuclear level where nucle ons are arranged in alternating spin--isospin layers [2\, 3]. The model of nuclear structure becomes isomorphic to the shell model and\, moreover\, composes the features of the liquid drop and cluster models. In difference with the shell model\, protons and neutrons in our model are strongly cor related. It turns out that building blocks of the nuclear structure are t hree-nucleon (triton and 3He) and four-nucleon (α-cluster) like configura tions. These configurations form inside nuclei virtual triton/3He and α- clusters. We apply the model to analyze nucleosynthesis in stars in the fr amework of α-clustering. It turns out that the gateway for synthesis of e lements heavier than 12C is provided by composition of 5 α- clusters\, th at corresponds to the excited state 20Ne. Excited 20Ne\, than decays to li ghter nuclei C\, N\, O.\nOur approach is an alternative to the 3-α Hoyle state that provides the nucleosynthesis of heavier elements occurring na turally in stars.\n\n\n\n1. G. Musulmanbekov\, in Frontiers of Fundamental Physics\, Ed. B. G. Sidharth\, (Kluwer Acad./Plenum Pub.\, New York\, 200 1)\, p. 109–120. (2004)\; PEPAN Lett.\, Vol.\, № 5\, p. 548-558.\n2. G . Musulmanbekov and N.D. Cook\, Phys.Atom.Nucl. \, 71\, 1226 (2008).\n3. G . Musulmanbekov\, in Exotic Nuclei\, Eds. Yu.Peniozhkevich and Yu. Sobolev \, World Sci.\, Singapore\, 2017\, p. 58\; arXiv:1708.04437v2 [nucl-th].\n \nhttps://indico.particle.mephi.ru/event/436/contributions/4171/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4171/ END:VEVENT BEGIN:VEVENT SUMMARY:Double-humped fission barrier and statistical mechanism of formati on of angular anisotropy of fission fragments DTSTART;VALUE=DATE-TIME:20241024T071500Z DTEND;VALUE=DATE-TIME:20241024T073000Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4174@cern.ch DESCRIPTION:Speakers: A. L. Barabanov (National Research Centre “Kurchat ov Institute”\, Moscow\, Russia\; National Research Nuclear University M EPhI\, Moscow\, Russia)\nFission of heavy nuclei by neutrons at low and in termediate energies (up to 100 MeV) occurs at relatively low angular momen ta\, which has little effect on the dynamics of nuclear deformation. Due t o this\, the anisotropy of the angular distribution of fission fragments r elative to the direction of motion of incident neutrons is determined by t he distribution over the projection K of the spin of the fissioning nucleu s onto the deformation axis. This distribution is formed at the fission ba rrier [1\,2]. At sufficiently high excitation energies\, the distribution over quantum number K is determined by statistical mechanism [3] and depen ds on the deformation and temperature of the nucleus. However\, due to var ious difficulties\, experimental and theoretical studies of the angular an isotropy of fission fragments by neutrons have not received sufficient att ention for a long time. In particular\, there is a lack of understanding o f the role of the the internal and external humps of fission barrier in t he formation of the K-distribution in each fissionable nucleus. Meanwhile\ , the answer to this question depends on various factors that determine th e energy dependence of the nuclear fission cross section for neutrons.\nOv er the past decade\, we have conducted measurements on a neutron time-of-f light spectrometer based on the GNEIS neutron complex at the 1 GeV proton synchrocyclotron of the National Research Centre “Kurchatov Institute” - PNPI (Gatchina) . We have obtained significant data on fission cross se ctions and the angular distributions of fission fragments for low and inte rmediate energy neutrons. In addition\, we have developed new approaches t o the analysis of these characteristics [4\,5]. In this paper\, we demonst rate that in the area of ​​applicability of the statistical model\, it is possible to determine from the angular distribution of fragments which hump of the fission barrier is responsible for the formation of the K-dis tribution.\n\n[1] A. Bohr. Proceedings of the International Conference on the Peaceful Uses of Atomic Energy\, 1955. V. 2. United Nations\, New York \, 1956. P. 151.\n\n[2] A. L. Barabanov\, W. I. Furman. Z. Phys. A 357\, 4 11 (1997).\n\n[3] R. Vandenbosch\, J. R. Huizenga. Nuclear Fission. New Yo rk\, Academic Press\, Inc.\, 1973.\n\n[4] A. S. Vorobyev et al. Phys. Rev. C 108\, 014621 (2023).\n\n[5] A. S. Vorobyev et al. Eur. Phys. J. A 60\, 117 (2024).\n\nhttps://indico.particle.mephi.ru/event/436/contributions/41 74/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4174/ END:VEVENT BEGIN:VEVENT SUMMARY:Investigation of the structure of the lowest quadrupole excitation s in Ge isotopes DTSTART;VALUE=DATE-TIME:20241024T070000Z DTEND;VALUE=DATE-TIME:20241024T071500Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4178@cern.ch DESCRIPTION:Speakers: Evgenii Mardyban (Joint institute of nuclear researc h)\nAt present\, a lot of experimental information has been accumulated on the structure of low-lying excited states in Ge isotopes. Interest in the se nuclei is due to the fact that with an increase in the number of neutro ns there is a transition between spherical and deformed forms of the nucle us that determine their structure. On the other hand\, microscopic calcula tions show that Ge isotopes are soft in relation to triaxial deformation. In this report\, we analyze the properties of low-lying 2+ states in isoto pes of 70-88Ge. Calculations were carried out by constructing and diagonal ization of the collective quadrupole Hamiltonian. The surfaces of potentia l energy and mass parameters were calculated in the relativistic mean fiel d model with two parameterization of the energy density functional: PC-PK1 and NL3. The results of the calculations are compared with the experiment al data and the results obtained within other approaches.\n\nhttps://indic o.particle.mephi.ru/event/436/contributions/4178/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4178/ END:VEVENT BEGIN:VEVENT SUMMARY:Relations of isotope yields as an indicator of neutron fluxes in a rtificial rapid process DTSTART;VALUE=DATE-TIME:20241024T064500Z DTEND;VALUE=DATE-TIME:20241024T070000Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4180@cern.ch DESCRIPTION:Speakers: Vladimir Lyashuk (Institute for Nuclear Research of the Russian Academy of Sciences)\nThe creation of heavy isotopes under ext remal pulsed neutron fluences (of $10^{24}$ n/cm$^2$ units) of artificial nucleosynthesis is investigated by means of the dynamical model taking int o account the temperature decrease at the matter expansion. The first tim e the creation of isotopes with neutron excess up to mass A = 255 was obta ined and discovered in the Mike experiment [1]. An intensive (n\,γ)-activ ation of the irradiated 238U target ensures the creation of neutron-rich i sotopes up to 257Fm. The rapid process is the consistent multiple neutron capture in the target (manufactured from the 238U or more heavy/mixture is otopes as 232Th\, 237Np\, 238U\, 242Pu\, 243Am). Creation of transuranium isotopes were investigated during the Plowshare program and some next nucl ear tests: Anacostia\, Kennebec\, Par\, Barbel\, Tweed\, Cyclamen\, Kankak ee\, Vulcan and Hutch [2-5].\nIn the realized model of the nucleosynthesis (realized during the short time exposition - ~$10^{-6}$ s) it were consid ered the sequential (n\,γ)-neutron captures by mono isotope 238U target a nd binary (238U + 239Pu)-variant for case of 239Pu injection [6\,7]. The m odel includes the temperature decrease during the adiabatic expansion with index γ = 1.5 at the initial temperature ~20 keV and linear velocity ~19 0 km/s. Here we simulated the isotope yields for Mike\, Anacostia\, Barbel \, Par\, Vulcan and Kankakee experiments. The obtained results indicated o n the approximately linear dependence for relations of the isotope yields relative to the obtained neutron fluence [8]. In the work we considered t he pairs of neighboring isotopes with atomic masses A=245 and 244\, A=246 and 245\, A=247 and 246. The relation 246/245 (i.e.\, yields with masses A =246 and 245) depending on the fluences is the most strong demonstrator of the linear dependence. The most strong confirmation of the roughly linear dependence was obtained for the pure 238U target.\n\nReferences\n\n[1] Do rn DW. Phys Rev 1962\;126:693\n\n[2] United States Nuclear Tests. July 194 5 through September 1992. DOE/NV-209-REV 16. September 2015.\n\n[3] Hoff R W\, Dorn DW. Nucl Sci Eng 1964\;18:110.\n\n[4] Dorn DW\, Hoff RW. Phys Rev Lett 1965\;14:440. \n\n[5] Balagna JP\, et al. Los Alamos Radiohemistry G roup. Phys Rev Lett 1965\;14:962.\n\n[6] Lutostansky YuS\, Lyashuk VI\, Pa nov IV. Bull Russ Acad Sci: Phys 2010\;75:533.\n \n[7] Lyashuk VI. Bull Ru ss Acad Sci: Phys 2012\;76:1182–6. \n\n[8] Lyashuk V.I.\, Results in Phy sics 2024\; 56:107234.\n\nhttps://indico.particle.mephi.ru/event/436/contr ibutions/4180/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4180/ END:VEVENT BEGIN:VEVENT SUMMARY:Charge radii and beta-decay properties of heavy Hg and Pt isotopes . DTSTART;VALUE=DATE-TIME:20241024T063000Z DTEND;VALUE=DATE-TIME:20241024T064500Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4179@cern.ch DESCRIPTION:Speakers: Ivan Borzov (National Research Centre Kurchatov inst itute)\nI.N. Borzov\, 1\, 2\n\n1) National Research Centre”Kurchatov Ins titute”\, Moscow\, Russia\n \n2) Bogolubov Laboratory of Theoretical Phy sics\, JINR\, Dubna\, Russia \n\nThe charge radii\, beta decay half-lives (T1/2) and delayed neutron emission probabilities (Pn) are calculated in t he chains of heavy Hg and Pt isotopes. The self-consistent Finite Fermi Sy stems theory (TFFS) with the Fayans energy-density functional DF3-a [1] is used. It describes well the experimental spectra of single-quasiparticle levels in isotopes near Z=82\, N >126. The isotopic dependence of the char ge radii has a characteristic kink at crossing of the neutron shell N = 12 6. The kink indices $\\xi$ = $ \\delta (128/126)/ \n \\delta (126/124)$\ , measured in [2\,3]\, are reproduced in the present calculations due to t he density gradient pairing and surface terms of DF3-a. In contrast\, with in the relativistic approach [4] a good description of the radii is achiev ed mostly due to an inversion of 2ng9/2 and 1ni11/2 levels which exists in the family of relativistic density functionals used in [4] but does not s how up in the experimental spectra. Half-lives and Pn values are compared with the compilation of experimental data [5] and with relativistic RHB+RQ RPA calculations [6]. Importantly\, an inversion of 2ng9/2 and 1ni11/2 lev els\, does not allow one to simultaneously describe the experimental charg e radii and beta decay rates in [4\,6]. However\, based on the Fayans func tional such a description is possible.\n\n1. I.N. Borzov\, S.V. Tolokonnik ov\, Physics of Atomic Nuclei 87\, 423 (2024). \n2. Z. Yue\, A. N. Andrey ev\, A. E. Barzakh \, I. N. Borzov \, J. G. Cubiss et.al. Physical Review C 110 (2024)\, accepted. \n3. Y. Hirayama for KISS Collaboration. Phys.Rev . C 106\, 034326 (2022)\; Eur. Phys. J. Spec. Top. 233\, 1209–1223 (2024 ). \n4. U.C. Perera\, A.V. Afanasjev\, P. Ring\, Phys. Rev. C 104\, 064313 (2021)\n5. Reference Database for Beta-Delayed Neutron Emission. https: //www-nds.iaea.org/beta-delayed-neutron/database.html \n6. T. Marketin\, L . Huther\, and G. Martínez-Pinedo. Phys. Rev. C 93\, 025805 (2016).\n\nht tps://indico.particle.mephi.ru/event/436/contributions/4179/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4179/ END:VEVENT BEGIN:VEVENT SUMMARY:Study of the 6Li low-lying excited states DTSTART;VALUE=DATE-TIME:20241023T080000Z DTEND;VALUE=DATE-TIME:20241023T081500Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4169@cern.ch DESCRIPTION:Speakers: Alla Demyanova (NRC Kurchatov Institute)\n6He is one of the simplest nuclei with a halo in the ground state 0+\; its study has received significant theoretical attention [1]. In [2]\, an assumption wa s made about a halo-like structure in the isobar-analog state of the 3.563 -MeV\, 0+ 6Li state. This structure is a spatially extended halo-like stru cture with an alpha particle core and a proton and neutron surrounding it. One of the last theoretical results is the calculations within the ab ini tio NCSM (no-core shell model) [3]. Calculations showed that the radius of the ground state of 6Li\, within the error limits\, coincides with the ra dius of the 3.56 MeV state of 6Li.\nOur group is studying the 6Li nucleus\ , especially its second excited 3.563-MeV\, 0+ state for a long time. One of the first results was the Modified diffraction model (MDM) application [4] to existing literature data. The literature differential cross section s for inelastic scattering of 3He + 6Li with excitation of the 2.19 MeV st ate\, 3+ at energies of 34 and 72 MeV and 3.56 MeV\, and 0+ state at energ ies of 24.6 and 27 MeV were analyzed. It was shown that the radius of the 2.19 MeV\, 3+ state\, within errors\, coincides with the radius of the gro und state\, and the radius of the 3.56 MeV\, 0+ state is 2.5 ± 0.2 fm [4] and\, within errors\, coincides with the radius of 6He\, which allows for the possibility of the presence of a halo (proton-neutron\, and in some w orks called tango-halo) [5]. The obtained value is less than the previousl y predicted radius of this state of 2.73 fm [2].\nDuring last year’s we are adopting “Distorted Wave Born Approximation” (DWBA) to make some q ualitative estimations on radii of 6Li excited states. Two new experiments were done: 1) 7Li (d\, t)6Li experiment was performed on the deuteron bea m of the U-150M cyclotron at the Institute of Nuclear Physics (Almaty\, Re public of Kazakhstan) at an energy of 14.5 MeV\; 2) 10B(7Li\,6Li)11B exper iment was performed on the 7Li beam of the U-400 accelerator beam of the F LNR JINR\, Dubna at energy of 58 MeV. The angular distributions for the gr ound and first excited states of 6Li were obtained. The experimental data were analyzed within the framework of the DWBA. We obtained radial depende nces of the form factors and the ANC values for 6Lig.s and 6Li (3.56 MeV) states. The obtained values of the ANC for the 6Lig.s. and 6Li(3.56 MeV) s tates are similar to those in the literature. This fact confirms correctne ss of our DWBA analysis. Comparison of the radial dependences of form fact ors shows that the wave function of the 6Li nucleus in the 6Li (3.56 MeV) state has increased spatial dimension compared to the 6Lig.s. state.\n\n[1 ] Y. Suzuki\, Nucl. Phys. A 528\, 395 (1991).\n\n[2] K. Arai et al.\, Phys . Rev. C 51\, 2488 (1995).\n\n[3] D. M. Rodkin\, Yu. M. Tchuvil’sky\, JE TP Letters\, 118 (3)\, 153 (2023).\n\n[4] A.S. Demyanova et al.\, “Possi ble existence of neutron-proton halo in 6Li” KnE Energy & Physics\, 1\, DOI 10.18502/ken.v3i1.1715 (2018). \n\n[5] I.N. Izosimov\, Phys. At. Nucl. 80\, 867 (2017).\n\nhttps://indico.particle.mephi.ru/event/436/contributi ons/4169/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4169/ END:VEVENT BEGIN:VEVENT SUMMARY:Study of the $^8$Li low-lying excited states DTSTART;VALUE=DATE-TIME:20241023T081500Z DTEND;VALUE=DATE-TIME:20241023T083000Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4170@cern.ch DESCRIPTION:Speakers: Andrey Danilov (NRC Kurchatov Institute)\nIn the A=8 multiplet\, a halo was first discovered in $^8$B in [1] based on the incr eased quadrupole moment. It was shown that the halo structure is core $^7$ Be and has a valence proton. It should be noted that the halo was discover ed despite the presence of both the Coulomb and centrifugal barriers. In [ 2]\, using total cross sections\, the presence of a proton halo in $^8$B w as confirmed\, and the root-mean-square radius R$_{rms}$ = 2.58 fm and the halo radius R$_h$ = 4.24 fm were determined. However\, the latest researc h indicates that $^8$B looks like a normal heavy ion [3]. All experiments confirm a narrow width of the longitudinal momentum distribution of the co re\, and an obvious tail structure in the density distribution.\n\nThis im plies that mirror nuclei $^8$Li will be an interesting candidate for explo ring the formation of the halo structure. Many calculations have been made to investigate its structure\, such as ab initio calculations\, the clust er model\, the shell model\, the Hartree-Fock method\, and the relativisti c mean field. In fact\, there is still a large ambiguity to explain the st ructure of $^8$Li theoretically due to the lack of experimental constraint s. Although some of these methods could reproduce the radius or the quadru pole moment for $^8$Li well\, none of them could well describe both 8Li an d 8B simultaneously. \n\nMeanwhile\, several groups have tried to determin e its structure directly by deducing its matter radius or density distribu tion through the measurement of cross sections. In [4] using total cross s ections\, it is stated that there is no halo in $^8$Li. In [5] $^8$Li was found to have a skin-like structure by comparing with the Li isotope and i ts mirror $^8$B. However\, the structure of the $^8$Li nucleus still canno t be clearly concluded\, especially for excited states.\n\nWe applied Modi fied diffraction model (MDM) to existing literature data on d+$^8$Li and $ ^8$Li+$^{12}$C scattering and obtained radii of low-lying excited states o f $^8$Li\, practically similar as for g.s.\n\nhttps://indico.particle.meph i.ru/event/436/contributions/4170/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4170/ END:VEVENT BEGIN:VEVENT SUMMARY:Double-hit experimental approach in studies of the multibody decay s of heavy nuclei. DTSTART;VALUE=DATE-TIME:20241023T074500Z DTEND;VALUE=DATE-TIME:20241023T080000Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4176@cern.ch DESCRIPTION:Speakers: Z.I. Goryainova (JINR)\nIn our previous publications [1–3]\, a very specific effect\, unknown in the past\, was discussed\, namely a break-up of the fission fragment while it passes through a solid- state foil. The fraction of the fragments which undergo the break-up is su pposed to be born in the shape isomer states. The bulk of the results were obtained in the frame of the so-called missing mass experimental method w hen only one of two partners of the break-up is detected by the spectromet er. The difference between the total mass of the detected fragments and th e mass of the mother system serves a sign of at least ternary decay. Alter native\, so called” double-hit” approach lets obtain more direct infor mation about the process. By definition\, the double-hit registration app roach means that two fragments were detected in the same PIN diode during one registration gate of 200 ns length. If a minimum time interval betwee n their time stamps is less than 30 ns a pile-up of the signals take place . Restoring original signals from pile-up is discussed.\n\nhttps://indico. particle.mephi.ru/event/436/contributions/4176/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4176/ END:VEVENT BEGIN:VEVENT SUMMARY:Manifestation of the N=32\, 34 subshell closures in the ternary de cays of heavy nuclei. DTSTART;VALUE=DATE-TIME:20241023T073000Z DTEND;VALUE=DATE-TIME:20241023T074500Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4175@cern.ch DESCRIPTION:Speakers: Yuri Pyatkov ()\nIn our previous publications [1-4] we presented experimental evidences of rare ternary decay mode of low exci ted heavy nuclei. Essential feature of this process is that some of the fi ssion fragments (FFs) born during binary fission undergo a break-up\, whil e they pass a solid-state foil. This break-up is delayed and occurs after the binary fission of the mother system. It is reasonable to think of such specific FFs as formed in the shape-isomer states. The break-up is due to the FF inelastic scattering in the foil medium. Strong indication was obt ained of clustering of the mother system at the stage of binary fission an d clustering of the intermediate fragment which undergoes further break-up . Deformed magic and semi-magic nuclei play role of clusters. We especiall y discuss the manifestation of the N=32\, 34 subshell closures in the ligh t products of the break-up.\n\nReferences\n\n1. Yu.V. Pyatkov et al.\, Eur . Phys. J. A 45\, 29 (2010).\n\n2. Yu.V. Pyatkov et al.\, Eur. Phys. J. A 48\, 94 (2012).\n\n3. Yu.V. Pyatkov et al.\, Phys. Rev. C 96 (2017) 064606 . \n\n4. Yu. V. Pyatkov et al.\, Physics of Atomic Nuclei\, 85\, 763 (2022 )\n\nhttps://indico.particle.mephi.ru/event/436/contributions/4175/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4175/ END:VEVENT BEGIN:VEVENT SUMMARY:Formation of the multi-neutron systems 2n and 3n in the reactions of stopped pion absorption DTSTART;VALUE=DATE-TIME:20241023T071500Z DTEND;VALUE=DATE-TIME:20241023T073000Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4181@cern.ch DESCRIPTION:Speakers: Boris Chernyshev ( National Research Nuclear Univers ity MEPhI)\nThe formation of the multi-neutron systems 2n and 3n was studi ed in the reactions of stopped pion absorption by 9Be nuclei. Measurements were carried out at low energy pion channel of LANL using two-arm multila yer semiconductor spectrometer. The bound states of 2n and 3n have not bee n found. In the missing mass spectrum of the reaction 9Be(pi-\, t4He)\, a peak was observed near the threshold\, which is due to the formation of th e s-wave virtual state of the dineutron. Indications of the existence of two states of the 3n with resonant parameters (Er ≈ 5 MeV\, Г \n\nhttp s://indico.particle.mephi.ru/event/436/contributions/4181/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4181/ END:VEVENT BEGIN:VEVENT SUMMARY:Peculiarities of the momentum spectra of light fragments at 56Fe f ragmentation with incident energy of 230 MeV/nucleon. DTSTART;VALUE=DATE-TIME:20241023T070000Z DTEND;VALUE=DATE-TIME:20241023T071500Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4183@cern.ch DESCRIPTION:Speakers: A.A. Kulikovskaya (NRC Kurchatov Institute)\nNew exp erimental results were obtained for the fragmentation of 230 MeV/nucleon 5 6Fe on 9Be\, 27Al\, 64Cu targets. The experiment was carried out on the FR AGM setup at TWA heavy ion facility. The detector FRAGM allows to measure the fragment momentum with high accuracy at an angle of 3.5 degrees [1\,2] . It was found that the momentum distribution of light fragments in the re st frame of the incident nucleus has a double-humped structure\, which is not typical for fragmentation processes. This paper contains a phenomenolo gical description of the magnitude of momentum peak splitting\, which is e specially manifested in proton spectra and decreases for heavier fragments . Experimental results are compared with data obtained on the FRS-GSI setu p [3] and with the predictions of different models of nucleus-nuclear coll isions. The possible source of this phenomenon is connected with coulomb e ffects in the asymmetric fission.\n\nBibliography\n\n[1] B.M. Abramov et a l.\, Phys.Atom.Nucl. 85\, 1541 (2022).\n\n[2] A.A. Kulikovskaya et al.\, P hys.Atom.Nucl. 85\, 466 (2022).\n\n[3] P. Napolitani et al.\, Phys.Rev. C 70\, 054607 (2004).\n\nhttps://indico.particle.mephi.ru/event/436/contribu tions/4183/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4183/ END:VEVENT BEGIN:VEVENT SUMMARY:Experimental study of the interaction of the proton and deuteron w ith the atomic nuclei of lithium and boron DTSTART;VALUE=DATE-TIME:20241023T064500Z DTEND;VALUE=DATE-TIME:20241023T070000Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4184@cern.ch DESCRIPTION:Speakers: Georgii Ostreinov (Budker Institute of Nuclear Physi cs)\nThe interaction of deuteron and proton beams with light nuclei is cha racterized by a wide variety of reactions of interest for both technical a nd fundamental applications.\nThe reaction $^7Li(d\,n)α$ is characterized by a high neutron yield and high neutron energy (13.125 MeV)\, which is r elevant for conducting radiation tests of modern materials and equipment.\ nFor the reaction $^{11}B(p\, α)αα$\, reliable knowledge of the cross s ection is relevant for proton therapy of cancer\, the implementation of th e boron-proton fusion reaction in thermonuclear energy and the study of th e mechanism of primary nucleosynthesis.\nDespite the long-standing interes t in these processes\, the experimental data on cross-sections vary greatl y among different authors\, and for a number of reactions\, cross-section values ​​are not available in the databases.\nAt the Institute of Nucl ear Physics of the Siberian Branch of the Russian Academy of Sciences\, at the VITA accelerator neutron source\, the cross-sections of the following reactions were measured experimentally in the energy range of 0.3-2.3 MeV :\n - $^6Li(d\,α)α$\, $^6Li(d\,p)^7Li$\, $^6Li(d\,p)^7Li^*$\,$^7Li(d\, α)^5He$\, $^7Li(d\,nα)α$\, $^{10}B(d\,α_0)^8Be$\, $^{10}B(d\,α_1)^8Be ^*$\, $^{10}B(d\,p_2)^9Be^*$\, $^{11}B(d\,α_0)^9Be$\, $^{11}B(d\,α_2)^9B e^*$\n - $^{11}B(p\,α)αα$\, $^{11}B(p\,α_0)^8Be$\, $^{11}B(p\,α_1)^8 Be^{**}$\n\nThe study was supported by the Russian Science Foundation gran t No. 19-72-30005\, https://rscf.ru/project/19-72-30005/.\n\nhttps://indic o.particle.mephi.ru/event/436/contributions/4184/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4184/ END:VEVENT BEGIN:VEVENT SUMMARY:Alpha-particle states in relativistic nuclear fragmentation DTSTART;VALUE=DATE-TIME:20241023T063000Z DTEND;VALUE=DATE-TIME:20241023T064500Z DTSTAMP;VALUE=DATE-TIME:20260715T163913Z UID:indico-contribution-216-4186@cern.ch DESCRIPTION:Speakers: Andrei Zaitsev ()\nEnsembles of He and H isotopes ca n be studied with unique completeness and resolution in nuclear emulsion l ayers longitudinally exposed to relativistic nuclei [1\,2]. Determination of the invariant mass of their pairs or triplets by emission angles in the velocity conservation approximation is sufficient to identify a number of unstable states – $^8$Be(0$^+$)\, $^8$Be(2$^+$)\, $^9$B\, $^{12}$C(0$^+ _2$)\, $^{12}$C(3$^-$)\, $^6$Be.\n\nThe BECQUEREL experiment [3\,4]\, usin g this approach\, is aimed at searching for the α-particle Bose-Einstein condensate (αBEC)\, an unstable of S-wave α-particle state. $^8$Be(0$^+$ ) is associated with 2αBEC\, and $^{12}$C(0$^+_2$) or the Hoyle state wit h 3αBEC. In the relativistic fragmentation of heavy nuclei\, an enhanceme nt of $^8$Be\, $^9$B and $^{12}$C(0$^+_2$) is detected\, suggesting their synthesis in the fusion of associated α-particles. The focus of the searc h is the 4αBEC state of $^{16}$O(0$^+_6$) at 660 keV above the 4α thresh old\, decaying into α$^{12}$C(0$^+_2$) or 2$^8$Be. In this context\, the status of the analysis of α-particle fragmentation in a nuclear emulsion exposed to $^{84}$Kr nuclei at 950 MeV per nucleon is presented. Secondary stars produced by relativistic neutrons are observed in the nucleus fragm entation cone [4]. The neutron average energy in the parent nucleus system is estimated to be 1.3 MeV [5].\n\nThe αBEC search leads to the study of nuclear matter in the region of temperature and density from red giants t o supernova. It is characterized by the ratios of $^{1\,2\,3}$H and $^{3\, 4}$He. Nuclear emulsion layers exposed to heavy nuclei of several GeV per nucleon at the NICA accelerator complex are optimal for identifying H and He isotopes by multiple scattering\, searching for unstable states\, and a ssessing neutron accompaniment. An exposure to $^{124}$Xe nuclei of 3.8 Ge V per nucleon\, performed at the NICA/Nuclotron accelerator complex\, allo ws the use of proven approaches. Parameters of the beam are determined usi ng the CR-39 track detector by direct crater counting on the Olympus BX63 microscope.\n\n[1] P.I. Zarubin\, Lect. Notes in Phys. 875\, Clusters in N uclei\, Volume 3. Springer Int. Publ.\, 51 (2013)\; arXiv: 1309.4881.\n\n[ 2] D.A. Artemenkov et al.\, Eur. Phys. J. A 56 250 (2020)\; arXiv: 2004.10 277.\n\n[3] A.A. Zaitsev et al.\, Phys. Lett. B 820 136460 (2021)\; arXiv: 2102.09541.\n\n[4] D.A. Artemenkov et al.\, Phys. At. Nucl. 85\, 528 (202 2)\; arXiv: 2206.096.\n\n[5] A.A. Zaitsev et al.\, Phys. At. Nucl. 86\, 1 101 (2023)\; arXiv: 2307.16465.\n\nhttps://indico.particle.mephi.ru/event/ 436/contributions/4186/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4186/ END:VEVENT END:VCALENDAR