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

Wu, J, Nishimura, S, Lorusso, G, Moller, P, Ideguchi, E, Regan, Patrick, Simpson, GS, Soderstrom, P-A, Walker, Philip, Watanabe, H et al, Xu, ZY, Baba, H, Browne, F, Daido, R, Doornenbal, P, Fang, YF, Gey, G, Isobe, T, Lee, PS, Liu, JJ, Li, Z, Korkulu, Z, Patel, Z, Phong, V, Rice, S, Sakurai, H, Sinclair, L, Sumikama, T, Tanaka, M, Yagi, A, Ye, YL, Yokoyama, R, Zhang, GX, Alharbi, T, Aoi, N, Bello Garrote, FL, Benzoni, G, Bruce, AM, Carroll, RJ, Chae, KY, Dombradi, Z, Estrade, A, Gottardo, A, Griffin, CJ, Kanaoka, H, Kojouharov, I, Kondev, FG, Kubono, S, Kurz, N, Kuti, I, Lalkovski, S, Lane, GJ, Lee, EJ, Lokotko, T, Lotay, Gavin, Moon, C-B, Nishibata, H, Nishizuka, I, Nita, CR, Odahara, A, Podolyak, Zsolt, Roberts, OJ, Schaffner, H, Shand, Callum, Taprogge, J, Terashima, S, Vajta, Z and Yoshida, S (2017) 94 -Decay Half-lives of Neutron-Rich 55Cs to 67Ho: Experimental Feedback and Evaluation of the r-Process Rare-Earth Peak Formation Physical Review Letters, 118 (7), 072701.

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Abstract

The -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 Radioactive Isotope Beam Factory (RIBF), providing a new experimental basis to test theoretical models. Striking, large drops of -decay half-lives are observed at neutron-number N = 97 for 58Ce, 59Pr, 60Nd, 62Sm, and N = 105 for 63Eu, 64Gd, 65Tb, 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.

Item Type:	Article
Subjects :	Physics
Divisions :	Faculty of Engineering and Physical Sciences > Physics
Authors :	Name Email ORCID Wu, J Nishimura, S Lorusso, G Moller, P Ideguchi, E Regan, Patrick P.Regan@surrey.ac.uk Simpson, GS Soderstrom, P-A Walker, Philip P.Walker@surrey.ac.uk Watanabe, H Xu, ZY Baba, H Browne, F Daido, R Doornenbal, P Fang, YF Gey, G Isobe, T Lee, PS Liu, JJ Li, Z Korkulu, Z Patel, Z Phong, V Rice, S Sakurai, H Sinclair, L Sumikama, T Tanaka, M Yagi, A Ye, YL Yokoyama, R Zhang, GX Alharbi, T Aoi, N Bello Garrote, FL Benzoni, G Bruce, AM Carroll, RJ Chae, KY Dombradi, Z Estrade, A Gottardo, A Griffin, CJ Kanaoka, H Kojouharov, I Kondev, FG Kubono, S Kurz, N Kuti, I Lalkovski, S Lane, GJ Lee, EJ Lokotko, T Lotay, Gavin g.lotay@surrey.ac.uk Moon, C-B Nishibata, H Nishizuka, I Nita, CR Odahara, A Podolyak, Zsolt Z.Podolyak@surrey.ac.uk Roberts, OJ Schaffner, H Shand, Callum c.shand@surrey.ac.uk Taprogge, J Terashima, S Vajta, Z Yoshida, S
Date :	16 February 2017
DOI :	10.1103/PhysRevLett.118.072701
Copyright Disclaimer :	Copyright 2017 American Physical Society
Related URLs :	Publisher
Depositing User :	Symplectic Elements
Date Deposited :	31 Jan 2017 18:17
Last Modified :	16 Jan 2019 17:11
URI:	http://epubs.surrey.ac.uk/id/eprint/813417

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