Single-particle and collective motions from nuclear many-body correlation (PCM2025)

Session

session #7

5 Mar 2025, 13:40

Main Lecture Hall (University of Aizu)

Conveners

session #7

• Marek Płoszajczak

61. Single-Neutron Excitations Outside of ${}^{132}$Sn and the Fate of Spin-Orbit Partners in Weakly Bound Systems

Benjamin P. Kay (Physics Division, Argonne National Laboratory)

05/03/2025, 13:40

Recent works using direct reactions and the solenoidal-spectrometer technique have revealed insights into the single-particle structure of weakly bound nuclei. Using CERN’s HIE-ISOLDE facility and the ISOLDE Solenoidal Spectrometer, the single-neutron strengths and energies of the $1f_{7/2}$, $2p_{3/2}$, $2p_{1/2}$, $0h_{9/2}$, $1f_{5/2}$, and $0i_{13/2}$ valence neutron orbitals outside of...

6. Pseudo-spin symmetry and tensor force

Hitoshi Nakada (Chiba University)

05/03/2025, 14:05

As representing the shell structure in certain regions, the pseudo-spin symmetry (PSS) has been found helpful in describing some characteristic structures of nuclei. In short, the PSS is the near degeneracy of single-particle (s.p.) orbitals with $\mathit{\Delta }j=1$ and $\mathit{\Delta }\ell =2$. It has been argued since the late 1990s that the PSS is a relativistic symmetry, as the s.p....

9. Evolutions from 1p-1h to 2p-2h states studied within Second Random-Phase Approximation

Futoshi Minato (Kyushu University)

05/03/2025, 14:25

We would like to present the effect of including two-particle two-hole (2p-2h) states in nuclear resonances. Configuration spaces of 2p-2h are known to be important to describe a spreading width of nuclear resonances. Recently, our group pointed out that its effect is also important to reproduce high-energy particle emission rates. To understand this phenomena comprehensively, it is necessary...

4. Study of multi-neutron emission process through beta-neutron-gamma spectroscopy of $N>50$ Gallium isotopes

Rin Yokoyama

05/03/2025, 14:45

Beta-delayed neutron emission occurs in neutron-rich nuclei where the decay energy window is large enough to populate states above the neutron separation energy in the daughter nucleus. Multi-neutron emission is expected to be the dominant decay mode for the nuclides far from stability, along the astrophysical r-process path. The number of neutrons emitted after 𝛽-decays affects the final...