LXXI International conference "NUCLEUS – 2021. Nuclear physics and elementary particle physics. Nuclear physics technologies"

SELF-CONSISTENT CALCULATIONS OF THE GROUND STATE AND β–DECAY PROPERTIES IN C, N, O REGION.

20 Sept 2021, 16:00

25m

Oral report Section 1. Experimental and theoretical studies of the properties of atomic nuclei. Section 1. Experimental and theoretical studies of the properties of atomic nuclei

Speaker

Ivan Borzov (NRC KI)

Description

I.N. Borzov 1,2

1 National Research Centre “Kurchatov Institute”, 123182, Moscow, Russia
2Bogolubov Laboratory of Theoretical Physics, Joint Institute of Nuclear Research, 141980,
†E-mail: Borzov_IN@nrcki.ru, cc: ibor48@mail.ru

Including the light neutron-rich nuclei to the r-process network is known to change the resulting heavy element abundances [1]. However, large-scale predictions of input data, in particular the β–decay rates are usualy obtained in the HF+BCS Quasiparticle Random Phase (QRPA) approximations. In case of the light neutron-rich nuclei they have to be taken with some care. In loosely bound isotopes close to the particle continuum in which a weak pairing approximation does not work, the cluster effects dominate [2].
The applicability limit of self-consistent description of the beta-decay properties using iterative HF+BCS for the ground state and continuum pnQRPA [3] is carefully checked for very neutron-rich C, N, O nuclei around the neutron shells at N=8,16 and compared with relativistic RHB+RQRPA [4] and FRDM+RPA [5] frameworks.
Supported by the grant of Russian Scientific Foundation (RSF 21-12-00061).

Fig. 1. The Sxn-values within the DF3a functional and FRDM in 22-30Oisotopes.
Fig. 2. The T1/2 and total Pn-values calculated from DF3a+CQRPA and RHB+RQRPA
in O isotopic chain compared with AME-2020.

1. Terasawa, M., K. Sumiyoshi, T. Kajino, G. J. Mathews, and I.Tanihata, Astrophys. J. 562, 479 (2001).
2. J. Okolowicz, M. Ploszajczac, W. Nazarewicz, Prog.Theor. Phys.Sup.,196, 230,2012
3. I. N. Borzov ,Phys.Rev. C67, 025802 (2003); Phys.At. Nuclei 83, 700(2020)
4. T. Marketin, L. Huther, and G. Martı´nez-Pinedo, Phys. Rev. C 93, 025805 (2016).
5. P. Mo¨ ller, M. R. Mumpower, T. Kawano, and W. D. Myers, At. Data Nucl. Data Tables 125, 1(2019).

Presentation materials

INB_Light Nucleus-21.pdf