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Phys. Rev. C 79, 035806 (2009) [18 pages]

β-decay half-lives and β-delayed neutron emission probabilities of nuclei in the region A≲110, relevant for the r process

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J. Pereira1,2,*, S. Hennrich2,3,4, A. Aprahamian5,6, O. Arndt3,4, A. Becerril1,2,7, T. Elliot1,2,7, A. Estrade1,2,7, D. Galaviz1,2,†, R. Kessler2,3,4, K.-L. Kratz4,8, G. Lorusso1,2,7, P. F. Mantica1,9, M. Matos1,2, P. Möller10, F. Montes1,2, B. Pfeiffer3,4, H. Schatz1,2,7, F. Schertz2,3,4, L. Schnorrenberger2,11, E. Smith2,12, A. Stolz1, M. Quinn5,6, W. B. Walters13, and A. Wöhr5,6
1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan, USA
2Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan, USA
3Institut für Kernchemie, Universität Mainz, Mainz, Germany
4Virtuelles Institut für Struktur der Kerne and Nuklearer Astrophysik, Mainz, Germany
5Institute of Structure and Nuclear Astrophysics, University of Notre Dame, South Bend, Indiana, USA
6Joint Institute for Nuclear Astrophysics, University of Notre Dame, South Bend, Indiana, USA
7Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan, USA
8Max Planck Institut für Chemie, Otto-Hahn-Institut, Mainz, Germany
9Department of Chemistry, Michigan State University, East Lansing, Michigan, USA
10Theoretical Division, Los Alamos National Laboratory, New Mexico, USA
11Institut für Kernphysik, TU Darmstadt, Darmstadt, Germany
12Department of Physics, Ohio State University, Columbus, Ohio, USA
13Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, USA

Received 30 December 2008; published 26 March 2009

Measurements of β-decay properties of A≲110 r-process nuclei have been completed at the National Superconducting Cyclotron Laboratory at Michigan State University. β-decay half-lives for 105Y, 106,107Zr, and 111Mo, along with β-delayed neutron emission probabilities of 104Y, 109,110Mo and upper limits for 105Y, 103-107Zr, and 108,111Mo have been measured for the first time. Studies on the basis of the quasi-random-phase approximation are used to analyze the ground-state deformation of these nuclei.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.79.035806
DOI:
10.1103/PhysRevC.79.035806
PACS:
23.40.-s, 21.10.Tg, 27.60.+j, 26.30.-k

*pereira@nscl.msu.edu

Present address: Centro de Física Nuclear da Universidade de Lisboa, 1649-003, Lisboa, Portugal.