ON THE NEUTRON DRIP-LINE OF Ca ISOTOPES

14 Oct 2020, 18:10
1h
Online

Online

Poster report Section 1. Experimental and theoretical studies of the properties of atomic nuclei. Poster session 1 (part 2)

Speaker

Dr Vyacheslav Tarasov (NSC, Kharkov Institute of Physics and Technology, Kharkov, Ukraine)

Description

On the basis of the Hartree-Fock-Bogolyubov (HFB) method with various versions of Skyrme forces we investigated the position of the neutron drip-line (NDL) of Ca isotopes with allowance for axial deformation of nuclei. For calculations of the properties of the ground state of even-even isotopes of Ca, we used computer code HFBTHO v2.00d [1] and our software package as in [2]. Our calculations and those of various authors [3] have shown that the position of the NDL for different types of Skyrme forces differs significantly in the boundary value of the number of neutrons $N_{drip-line}$. We have shown that for the same type of Skyrme forces, the determination of the $N_{drip-line}$ is also ambiguous. We performed constrained HFB calculations of the total energy of Ca isotopes in the vicinity of the NDL depending on the quadrupole deformation parameter $\beta_2$ in the range of $-0.5\leq\beta_2\leq0.5$. It is shown that for the isotopes $^{68}$Ca (forces UNEDF1) and $^{66}$Ca (forces SLy4) over the entire range of considered $\beta_2$, in the vicinity of the min curve E($\beta_2$), the chemical potential of the nuclei is $\lambda_n<0$. These isotopes can be considered as neutron-stable. For the isotopes $^{70}$Ca (forces UNEDF1) and $^{68}$Ca (forces SLy4) in the vicinity of the min curve E($\beta_2$), the chemical potential of the nuclei is $\lambda_n>0$. If we consider the condition $\lambda_n<0$ as a condition for the stability of the nucleus with respect to the emission of one neutron, then the nucleus $^{70}$Ca (for forces UNEDF1) and $^{68}$Ca (for SLy4 forces) cannot be considered as neutron-stable. In [3], these nuclei are given as neutron-stable for which the separation energies of one neutron have positive values.

  1. M.V.Stoitsov et al. // Comp. Phys. Com. 2013. V. 184. P. 1592.
  2. V.N.Tarasov et al. // Phys. Atom. Nucl. 2012. V. 75. P. 17.
  3. J.Erler et al. // Nature 2012. V. 486. P. 509; http://massexplorer.frib.msu.edu/.

Primary author

Dr Vyacheslav Tarasov (NSC, Kharkov Institute of Physics and Technology, Kharkov, Ukraine)

Co-authors

Dr Viktor Kuprikov (NSC, Kharkov Institute of Physics and Technology, Kharkov, Ukraine) Mr Dmytro Tarasov (NSC, Kharkov Institute of Physics and Technology, Kharkov, Ukraine)

Presentation materials

There are no materials yet.