Phys.Rev.Lett. 118, 072701 (2017)

J.Wu, S.Nishimura, G.Lorusso, P.Moller, E.Ideguchi, P.-H.Regan, G.S.Simpson, P.-A.Soderstrom, 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.Liu, Z.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.Podolyak, O.J.Roberts, H.Schaffner, C.Shand, J.Taprogge, S.Terashima, Z.Vajta, S.Yoshida

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

RADIOACTIVITY ^{144,145,146,147,148,149,150,151}Cs, ^{146,147,148,149,150,151,152,153,154}Ba, ^{148,149,150,151,152,153,154,155,156}La, ^{150,151,152,153,154,155,156,157,158}Ce, ^{153,154,155,156,157,158,159,160}Pr, ^{156,157,158,159,160,161,162}Nd, ^{159,160,161,162,163}Pm, ^{160,161,162,163,164,165,166}Sm, ^{161,162,163,164,165,166,167,168}Eu, ^{165,166,167,168,169,170}Gd, ^{166,167,168,169,170,171,172}Tb, ^{169,170,171,172,172m,173}Dy, ^{172,173,174,175}Ho, ^174mEr(β^-)[from Be(²³⁸U, X), E=345 MeV/nucleon]; measured and analyzed reaction products using BigRIPS separator and ZeroDegree Spectrometer (ZDS), γ rays, half-lives by (implant)β correlations using WAS3ABi and EURICA detection systems at RIBF-RIKEN facility; deduced Gamow-Teller strength functions, r-process abundance pattern in the solar system. Comparison with previous experimental half-lives, and with three theoretical calculations using FRDM+QRPA, KTUY+GT2, and RHB+pn-RQRPA models. Numerical values of half-lives listed in supplementary file.

doi: 10.1103/PhysRevLett.118.072701