Continuum dipole response near the threshold and the direct neutron capture cross section at astrophysical energies

International Symposium on Exotic Nuclear Structure From Nucleons 2012

Matsuo, Masayuki^1

Department of Physics, Faculty of Science, Niigata University, Niigata 950-2181, Japan^1

关键词: Astrophysical energies;    Detailed balance;    Dipole strengths;    Electric dipole strength;    Neutron capture cross section;    Neutron decays;    Quasi particles;    Random phase approximations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/445/1/012019/pdf
DOI  :  10.1088/1742-6596/445/1/012019

来源: IOP

【 摘 要 】

We apply the continuum quasiparticle random phase approximation to calculate the direct neutron capture cross section relevant to the r-process nucleo-synthesis. The electric dipole strength function in an even-even n-rich nucleus is decomposed with respect to the channels of direct neutron decays. Using the detailed balance relation, the partial dipole strengths are converted to obtain the direct neutron-capture cross sections. Numerical examples are given for142Sn.