Shape evolution in neutron-rich Rh isotopes: First measurement of negative-parity isomers in 117,119Rh

Zhang, J.Z.; Chen, Z.Q.; Qu, T.; Wang, Y.K.; Li, Z.H.; Hua, H.; Zhao, P.W.; Watanabe, H.; Lorusso, G.; Yuan, C.X.; Nishimura, S.; Baba, H.; Benzoni, G.; Browne, F.; Chae, K.Y.; Crespi, F.C.L.; Doornenbal, P.; Fukuda, N.; Gernhauser, R.; Gey, G.; Guo, C.Y.; Inabe, N.; Isobe, T.; Jiang, D.X.; Jin, Y.; Jung, H.S.; Jungclaus, A.; Kameda, D.; Kim, G.D.; Kim, Y.K.; Kojouharov, I.; Kondev, F.G.; Kubo, T.; Kurz, N.; Lane, G.J.; Li, X.Q.; Lou, J.L.; Luo, D.W.; Montaner-Piza, A.; Moschner, K.; Naqvi, F.; Ni, L.; Niikura, M.; Nishibata, H.; Odahara, A.; Orlandi, R.; Patel, Z.; Podolyák, Zs.; Sakurai, H.; Schaffner, H.; Simpson, G.S.; Soderstrom, P.-A.; Steiger, K.; Sumikama, T.; Suzuki, H.; Takeda, H.; Taprogge, J.; Wendt, A.; Wu, H.Y.; Wu, J.; Xu, C.; Xu, Z.Y.; Yagi, A.; Ye, Y.L.; Yoshinaga, K.; Zhang, S.Q.; Zhang, S.Y.; Zhou, Z.X.

doi:10.1016/j.physletb.2025.140144

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Shape evolution in neutron-rich Rh isotopes: First measurement of negative-parity isomers in 117,119Rh

Zhang, J.Z.;
Chen, Z.Q.;
Qu, T.;
Wang, Y.K.;
Li, Z.H.;
... Chae, K.Y.;
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The β -delayed γ -ray spectroscopy of neutron-rich 117,119Rh isotopes has been investigated at the Radioactive Isotope Beam Factory of RIKEN. The 1/2− isomers in 117,119Rh have been identified for the first time. The systematics of energy differences between the 9/2+ and 1/2− states have been extended up to N=74, which shows a tendency to first increase with the neutron number N , then reach a maximum at N ≈ 68, and subsequently decrease. Self-consistent triaxial relativistic Hartree-Bogoliubov (TRHB) calculations highlight the crucial role of triaxial deformation, particularly in the positive-parity states, in driving the observed evolution of energy differences. A shape transition from axially symmetric to triaxial and back to axially symmetric deformation is suggested along the Rh isotopic chain. These findings provide new insights into the structure of neutron-rich nuclei in the A ∼ 110 region and motivate further studies of exotic isotopes in this region to explore the interplay between triaxiality and shell evolution.

키워드

Isomeric decays; Shape evolution; Triaxial relativistic Hartree-Bogoliubov calculations; Triaxiality; NUCLEAR-DATA SHEETS; COEXISTENCE; RIKEN; ROTATION; STATES

제목: Shape evolution in neutron-rich Rh isotopes: First measurement of negative-parity isomers in 117,119Rh

저자: Zhang, J.Z.; Chen, Z.Q.; Qu, T.; Wang, Y.K.; Li, Z.H.; Hua, H.; Zhao, P.W.; Watanabe, H.; Lorusso, G.; Yuan, C.X.; Nishimura, S.; Baba, H.; Benzoni, G.; Browne, F.; Chae, K.Y.; Crespi, F.C.L.; Doornenbal, P.; Fukuda, N.; Gernhauser, R.; Gey, G.; Guo, C.Y.; Inabe, N.; Isobe, T.; Jiang, D.X.; Jin, Y.; Jung, H.S.; Jungclaus, A.; Kameda, D.; Kim, G.D.; Kim, Y.K.; Kojouharov, I.; Kondev, F.G.; Kubo, T.; Kurz, N.; Lane, G.J.; Li, X.Q.; Lou, J.L.; Luo, D.W.; Montaner-Piza, A.; Moschner, K.; Naqvi, F.; Ni, L.; Niikura, M.; Nishibata, H.; Odahara, A.; Orlandi, R.; Patel, Z.; Podolyák, Zs.; Sakurai, H.; Schaffner, H.; Simpson, G.S.; Soderstrom, P.-A.; Steiger, K.; Sumikama, T.; Suzuki, H.; Takeda, H.; Taprogge, J.; Wendt, A.; Wu, H.Y.; Wu, J.; Xu, C.; Xu, Z.Y.; Yagi, A.; Ye, Y.L.; Yoshinaga, K.; Zhang, S.Q.; Zhang, S.Y.; Zhou, Z.X.

DOI: 10.1016/j.physletb.2025.140144

발행일: 2026-02

유형: Article

저널명: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

권: 873

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