Speaker
Mr
Yoshihiko Kobayashi
(Niigata University)
Description
Low-lying (less than 1 MeV) resonances in neutron-rich nuclei has important role in neutron capture phenomena like the r-process. We focus on a new type resonance in superfluid nuclei. That is called quasi-particle resonance [1,2]. Many nuclei with open-shell configuration have superfluidity generated by pairing correlation. The pairing correlation causes continuum coupling in weakly bound nuclei like neutron drip-line nuclei. The Hartree-Fock-Bogoliubov theory in coordinate space can describe such weakly bound superfluid system [3,4]. It is a mean-field theory including pair condensate field. The theory predict the quasi-particle resonance in a single-particle scattering problem on a superfluid nucleus. An unbound particle couples a Cooper pair and a hole orbit, then forms the quasi-particle resonance. We have investigated the effects of pairing correlation on the width of low-lying p wave quasi-particle resonance. Through this investigation, we have discovered that the pairing correlation has the effect of reducing the resonance width [5].
[1] S. T. Belyaev, A. V. Smirnov, S. V. Tolokonnikov, and S. A. Fayans, Sov. J. Nucl. Phys. 45, 783 (1987).
[2] A. Bulgac, arXiv:nucl-th/9907088 (1980).
[3] J. Dobaczewski, H. Flocard, and J. Treiner, Nucl. Phys. A 422, 103 (1984).
[4] J. Dobaczewski, W. Nazarewicz, T. R. Werner, J. F. Berger, C. R. Chinn, and J. Dechargé, Phys. Rev. C 53, 2809 (1996).
[5] Y. Kobayashi and M. Matsuo, Prog. Theor. Exp. Phys. 013D01 (2016).
Primary author
Mr
Yoshihiko Kobayashi
(Niigata University)
Co-author
Prof.
Masayuki Matsuo
(Department of Physics, Niigata University)
