Mass-23 nuclei in astrophysics

38th Symposium on Nuclear Physics

Fraser, P.R.^1 ; Amos, K.^2,3 ; Canton, L.^4 ; Karataglidis, S.^2,3 ; Svenne, J.P.^5 ; Van Der Kniff, D.^2

Department of Imaging and Applied Physics, Curtin University, Bentley

WA

6102, Australia^1

School of Physics, University of Melbourne, VIC

3010, Australia^2

Department of Physics, University of Johannesburg, P.O. Box 524, Auckland-Park

2006, South Africa^3

Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Padova

I-35131, Italy^4

Department of Physics and Astronomy, University of Manitoba, Winnipeg Institute for Theoretical Physics, Winnipeg

MB

R3T 2N2, Canada^5

关键词: Distribution of element;    Ground-state band;    Multi channel;    Nuclear scattering;    Radiative capture;    Stellar models;    Target state;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/639/1/012005/pdf
DOI  :  10.1088/1742-6596/639/1/012005

来源: IOP

【 摘 要 】

The formation of mass-23 nuclei by radiative capture is of great interest in astrophysics. A topical problem associated with these isobars is the so-called22Na puzzle of ONe white dwarf novae, where the abundance of22Na observed is not as is predicted by current stellar models, indicating there is more to learn about how the distribution of elements in the universe occurred. Another concerns unexplained variations in elements abundance on the surface of aging red giant stars. One method for theoretically studying nuclear scattering is the Multi-Channel Algebraic Scattering (MCAS) formalism. Studies to date have used a simple collective-rotor prescription to model the target states which couple to projectile nucleons. While, in general, the target states considered all belong to the ground state rotor band, for some systems it is necessary to include coupling to states outside of this band. Herein we discuss an extension of MCAS to allow coupling of different strengths between such states and the ground state band. This consideration is essential when studying the scattering of neutrons from22Ne, a necessary step in studying the mass-23 nuclei mentioned above.