The size of a nucleus defined by the radius of its nucleon (proton and neutron) density distribution and the proton charge distribution is one of the most fundamental and important nuclear characteristics. Nuclear radius determines the basic properties of nuclei and is a consequence of the fundamental features of the strong interaction.
The development of methods of measuring the radii of...
In our previous publications [1–4] we discussed various manifestations of a new decay channel of the low excited heavy nuclei called collinear cluster tri-partition (CCT). In the frame of the essentially modified experimental method, additional linear structures corresponding to the relations M1 + M2 = const and M1 – M2 = const for the masses M1 and M2 of the fission fragments (FFs) from...
This work presents the results of single and double charge exchange reactions measuring in the fragmentation of carbon ions at the energy of 300 MeV/nucleon. Experimental data were collected at the FRAGM facility and the ITEP-TWAC multi-purpose accelerator complex on a thin beryllium target [1, 2]. The search was made for the following set of isotopes that carried out with nucleon charge...
Results of a search for hidden patterns in the behavior of the 214Po half-life solar-daily variation parameters obtained in the data collected in the 2012 – 2015 years are presented. It is shown that amplitude of the sine curve approximated a half-life solar-daily dependence obtained for an each season of the year by an averaging through 90 days could reach 3.3∙10-3 from the daily averaged...
The formation of the unbound heavy helium isotopes 7,9He was studied in the reactions of stopped pion absorption by light nuclei. The ground and excited states were observed in the following channels: 9Be(pion-,d)7He, 11B(pion-,pt)7He, 10B(pion-,pd)7He, 11B(pion-,pt)7He, 10B(pion-,dd)7He, 12C(pion-,p4He)7He, 12C(pion-,d3He)7He, 14C(pion-,t4He)7He and 11B(pion-,pp)9He, 14C(pion-,p4He)9He,...
On behalf of BSTU-PhIAN-INF collaboration
Possible temporal variations of nucleus decay parameters were studied extensively in the last years, their observation can be the signal of unknown physical effects. Several experiments reported the annual and daily decay rate oscillations in alpha and beta-decays of some radioactive nuclides at the level of .05 % [1,2]. Also, correlation of ...
Cluster structure plays an important role in nuclei, in particular, in light ones. One of the common types of clusters is the α-particle. Consisting of four nucleons, the alpha particle is tightly bound and has no excited state up to 20 MeV and behaves as a well-established subunit in nuclei.
Considerable attention has been drawn to the studies of $\alpha$-cluster states in $^{12}$C,...
The mass distributions of 252Cf(sf) ternary fission fragments with the emission of a light charged particle are measured. The experiment was carried out on a modernized COMETA time-of-flight spectrometer consisting of 28 silicon pin diodes with a thin input window and a starting detector based on microchannel plates. The threshold for the measured particle energy was ~1 MeV. The mass...
Measurements of the neutron cross-sections of heavy nuclei and their
analysis at the IAE and ITEP, carried out in the 1950s and later, made
it possible to find out deviations from the statistical model in the
distributions of positions and spacings of neutron resonance levels.
This work is a review of the analysis of the energies
of nuclear states and the particle mass spectrum, based on...
One of the most interesting properties of an atomic nucleus is its root-mean-square charge radius. This quantity can be measured using several different types of experiments. One of them is the observation of an isotopic shift in atomic spectra. An important feature of this method is the ability to determine the radii of short-lived nuclei. To find the radius from experimental data for one...
Generation of 14C radioisotope in the Earth atmosphere occurs by the 14N(n,p)14C reaction under cosmogenic fluxes and this process is considered as the main source of radiocarbon creation with rate of accumulation is evaluated as ~ 6.6 kg per year. An exclusively opportunities of dating based on the analysis of 14C concentration in the very old and ancient organic samples led to the discovery...
Studies of hypernuclei with proton or neutron excess are of particular relevance now in strangeness physics. Such systems scarcely studied experimentally can currently be produced in heavy ion collisions at NICA complex developed in DUBNA. Research in exotic hypernuclei can provide insight into various aspects of hyperonic interactions including density dependence of the ΛN interaction, core...
Masses of nuclei constitute an important part of the nuclear data required by many astrophysical models. We describe a method of obtaining Bayesian estimates of difference expressions of nuclear binding energies for medium and heavy nuclei, such as the residual neutron-proton interaction energy $\Delta_{np}$ and the well-known Garvey--Kelson expressions, using the Markov chain Monte-Carlo...
The properties of the collective low-lying states of Zr isotopes indicate that some of these states are mainly spherical and the other are mainly deformed ones. In our previous works [1,2], it was shown that the structure of low-lying collective states of $^{96}$Zr can be satisfactorily described within the framework of a geometric collective model based on the Bohr Hamiltonian with a...
A comprehensive analysis of the isoscalar giant monopole resonance (ISGMR) has long been a subject of extensive theoretical and experimental research [1,2]. The ISGMR properties are presently an important problem not only from the nuclear structure point of view [2,3] but also because of the special role they play in many astrophysical processes such as prompt supernova explosions [4] and the...
The design of nuclear installations based on accelerators (or Accelerator Driven Systems - ADS) requires sufficiently accurate data on the total and differential cross sections for nuclear fission by neutrons with energies up to several hundred MeV. The situation with the reliability and completeness of such data and other important characteristics associated with them, which cannot always be...
**Heavy-ion-induced projectile fragmentation reactions at Fermi energies are of interest to investigate the properties of nuclei far from the valley of stability, to know more about nuclear potential and equation of state of nuclear matter. These reactions are also useful to obtain exotic nuclei to be used as secondary beams. The reaction mechanism of these reaction is complicated, this...
