94 beta-Decay Half-Lives of Neutron-Rich Cs-55 to Ho-67: Experimental Feedback and Evaluation of the r-Process Rare-Earth Peak Formation
- Wu, J.
- Nishimura, S.
- Lorusso, G.
- Moller, P.
- Ideguchi, E.
- Regan, P.H.
- Simpson, G. S.
- Soderstrom, P.A.
- Walker, P. M.
- Watanabe, H.
- Xu, Z. Y.
- Baba, H.
- Browne, F.
- Daido, R.
- Doornenbal, P.
- Fang, Y. F.
- Gey, G.
- Isobe, T.
- Lee, P. S.
- Liu, J. J.
- Li, Z.
- Korkulu, Z.
- Patel, Z.
- Phong, V.
- Rice, S.
- Sakurai, H.
- Sinclair, L.
- Sumikama, T.
- Tanaka, M.
- Yagi, A.
- Ye, Y. L.
- Yokoyama, R.
- Zhang, G. X.
- Alharbi, T.
- Aoi, N.
- Garrote, F. L. Bello
- Benzoni, G.
- Bruce, A. M.
- Carroll, R. J.
- Chae, K. Y.
- Dombradi, Z.
- Estrade, A.
- Gottardo, A.
- Grif
DOIAbstract
The beta-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 Er-174m, Dy-172m were measured at the Radioactive Isotope Beam Factory, providing a new experimental basis to test theoretical models. Strikingly large drops of beta-decay half-lives are observed at neutron-number N = 97 for Ce-58, Pr-59, Nd-60, and Sm-62, and N = 105 for Eu-63, Gd-64, Tb-65, and Dy-66. 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...
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