94 β -Decay Half-Lives of Neutron-Rich Cs 55 to Ho 67: Experimental Feedback and Evaluation of the r -Process Rare-Earth Peak Formation

J. Wu, S. Nishimura, G. Lorusso, P. Möller, E. Ideguchi, P. H. Regan, G. S. Simpson, P. A. Söderström, P. M. Walker, H. Watanabe, Z. Y. Xu, H. Baba, F. Browne, R. Daido, P. Doornenbal, Y. F. Fang, G. Gey, T. Isobe, P. S. Lee, J. J. LiuZ. Li, Z. Korkulu, Z. Patel, V. Phong, S. Rice, H. Sakurai, L. Sinclair, T. Sumikama, M. Tanaka, A. Yagi, Y. L. Ye, R. Yokoyama, G. X. Zhang, T. Alharbi, N. Aoi, F. L. Bello Garrote, G. Benzoni, A. M. Bruce, R. J. Carroll, K. Y. Chae, Z. Dombradi, A. Estrade, A. Gottardo, C. J. Griffin, H. Kanaoka, I. Kojouharov, F. G. Kondev, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G. J. Lane, E. J. Lee, T. Lokotko, G. Lotay, C. B. Moon, H. Nishibata, I. Nishizuka, C. R. Nita, A. Odahara, Zs Podolyák, O. J. Roberts, H. Schaffner, C. Shand, J. Taprogge, S. Terashima, Z. Vajta, S. Yoshida

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    73 Citations (Scopus)

    Abstract

    The β-decay half-lives of 94 neutron-rich nuclei Cs144-151, Ba146-154, La148-156, Ce150-158, Pr153-160, Nd156-162, Pm159-163, Sm160-166, Eu161-168, Gd165-170, Tb166-172, Dy169-173, Ho172-175, and two isomeric states Er174m, Dy172m were measured at the Radioactive Isotope Beam Factory, providing a new experimental basis to test theoretical models. Strikingly large drops of β-decay half-lives are observed at neutron-number N=97 for Ce58, Pr59, Nd60, and Sm62, and N=105 for Eu63, Gd64, Tb65, and Dy66. Features in the data mirror the interplay between pairing effects and microscopic structure. r-process network calculations performed for a range of mass models and astrophysical conditions show that the 57 half-lives measured for the first time play an important role in shaping the abundance pattern of rare-earth elements in the solar system.

    Original languageEnglish
    Article number072701
    JournalPhysical Review Letters
    Volume118
    Issue number7
    DOIs
    Publication statusPublished - 16 Feb 2017

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