TY - JOUR

T1 - Spin-triplet proton-neutron pair in spin-dipole excitations

AU - Yoshida, Kenichi

AU - Tanimura, Yusuke

N1 - Funding Information:
Discussions with K. Hagino and H. Sagawa are acknowledged. This work was supported by the JSPS KAKENHI (Grants No. JP19K03824, No. JP19K03861, and No. JP19K03872) and the JSPS/NRF/NSFC A3 Foresight Program “Nuclear Physics in the 21st Century.” The nuclear DFT calculations were performed on Yukawa-21 at the Yukawa Institute for Theoretical Physics, Kyoto University.
Funding Information:
Japan Society for the Promotion of Science Yukawa Institute for Theoretical Physics, Kyoto University
Publisher Copyright:
© 2021 American Physical Society

PY - 2021/7

Y1 - 2021/7

N2 - Background: Spin-triplet proton-neutron pairing in nuclei has been under debate. It is well known that the dynamical pairing affects the nuclear matrix element of the Gamow-Teller (GT) transition and the double decay. Purpose: We investigate the effect of the -pair interaction in the channel on the low-lying spin-dipole (SD) transition. We then aim at clarifying the distinction of the role in between the SD and GT transitions. Method: We perform a three-body model calculation for the transition , where is taken as a core. The strength of the pair interaction is varied to see the effect on the SD transition-strength distribution. To fortify the finding obtained by the three-body model, we employ the nuclear energy-density functional method for the SD transitions in several nuclei, where one can expect a strong effect. Results: The effect of the -pair interaction depends on the spatial overlap of the pair and the angular momentum of the valence nucleons; the higher the angular momentum of the orbitals, the more significant the effect. Conclusions: The dynamical pairing is effective even for SD states, although the spatial overlap of the pair can be smaller than GT states. The SD transition involving high- orbitals with the same principal quantum number is strongly affected by the dynamical pairing.

AB - Background: Spin-triplet proton-neutron pairing in nuclei has been under debate. It is well known that the dynamical pairing affects the nuclear matrix element of the Gamow-Teller (GT) transition and the double decay. Purpose: We investigate the effect of the -pair interaction in the channel on the low-lying spin-dipole (SD) transition. We then aim at clarifying the distinction of the role in between the SD and GT transitions. Method: We perform a three-body model calculation for the transition , where is taken as a core. The strength of the pair interaction is varied to see the effect on the SD transition-strength distribution. To fortify the finding obtained by the three-body model, we employ the nuclear energy-density functional method for the SD transitions in several nuclei, where one can expect a strong effect. Results: The effect of the -pair interaction depends on the spatial overlap of the pair and the angular momentum of the valence nucleons; the higher the angular momentum of the orbitals, the more significant the effect. Conclusions: The dynamical pairing is effective even for SD states, although the spatial overlap of the pair can be smaller than GT states. The SD transition involving high- orbitals with the same principal quantum number is strongly affected by the dynamical pairing.

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U2 - 10.1103/PhysRevC.104.014319

DO - 10.1103/PhysRevC.104.014319

M3 - Article

AN - SCOPUS:85111649081

VL - 104

JO - Physical Review C

JF - Physical Review C

SN - 2469-9985

IS - 1

M1 - 014319

ER -