Isomeric and beta-decay spectroscopy of Ho-173,Ho-174

J. J. Liu,J. Lee, H. Watanabe,S. Nishimura,G. X. Zhang, J. Wu,P. M. Walker,P. H. Regan,P-A Soderstrom, H. Kanaoka,Z. Korkulu,P. S. Lee,A. Yagi,A. C. Dai, F. R. Xu,D. S. Ahn,T. Alharbi,H. Baba,F. Browne,A. M. Bruce, R. J. Carroll,K. Y. Chae,Zs Dombradi,P. Doornenbal, A. Estrade, N. Fukuda, C. Griffin, E. Ideguchi,N. Inabe,T. Isobe,S. Kanaya, I Kojouharov,F. G. Kondev,T. Kubo, S. Kubono,N. Kurz,I Kuti,S. Lalkovski,G. J. Lane,C. S. Lee,E. J. Lee,G. Lorusso,G. Lotay,C-B Moon,I Nishizuka,C. R. Nita, A. Odahara,Z. Patel,V. H. Phong,Zs Podolyak,O. J. Roberts,H. Sakurai, H. Schaffner,C. M. Shand,Y. Shimizu,T. Sumikama,H. Suzuki,H. Takeda,S. Terashima,Zs Vajta,J. J. Valiente-Dobon,Z. Y. Xu

PHYSICAL REVIEW C（2020）

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摘要

beta-decay spectroscopy of Ho-173,Ho-174 (Z = 67, N =106,107) was conducted at Radioactive Isotope Beam Factory at RIKEN by using in-flight fission of a 345-MeV/u U-238 primary beam. A previously unreported isomeric state at 405 keV with half-life of 3.7(12) mu s and a spin and parity of (3/2(+)) is identified in Ho-173. Moreover, a new state with a spin and parity of 9(-) was discovered in Er-174. The experimental log ft values of 5.84(20) and 5.25(18) suggest an allowed-hindered beta decay from the ground state of Ho-174 to the K-pi = 8(-) isomeric state in Er-174. Configuration-constrained potential energy surface (PES) calculations were performed and the predictions are in reasonable agreement with the experimental results.

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