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SUMMARY:Study of the 6Li low-lying excited states
DTSTART;VALUE=DATE-TIME:20241023T080000Z
DTEND;VALUE=DATE-TIME:20241023T081500Z
DTSTAMP;VALUE=DATE-TIME:20260422T235317Z
UID:indico-contribution-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/
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