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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. Xu H. Baba F. Browne R. Daido P. Doornenbal Y. f. Fang G. Gey 1, 2 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. Nita A. Odahara Zs. Podolyák Q.J. Roberts H. Schaffner C. Shand J. Taprogge S. Terashima Z. Vajta S. Yoshida
1 ILL - Institut Laue-Langevin
2 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
Abstract : The β-decay half-lives of 94 neutron-rich nuclei 144−151Cs, 146−154Ba, 148−156La, 150−158Ce, 153−160Pr, 156−162Nd, 159−163Pm, 160−166Sm, 161−168Eu, 165−170Gd, 166−172Tb, 169−173Dy, 172−175Ho, and two isomeric states 174mEr, 172mDy 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 58Ce, 59Pr, 60Nd, and 62Sm, and N=105 for 63Eu, 64Gd, 65Tb, and 66Dy. 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.
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Submitted on : Monday, February 20, 2017 - 12:39:51 PM
Last modification on : Friday, April 3, 2020 - 11:44:43 AM

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J. Wu, S. Nishimura, G. Lorusso, P. Möller, E. Ideguchi, et al.. 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. Physical Review Letters, American Physical Society, 2017, 118 (7), pp.072701 ⟨10.1103/PhysRevLett.118.072701⟩. ⟨in2p3-01471856⟩

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