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Phys. Rev. C 73, 035801 (2006) [9 pages]

β-decay half-lives and β-delayed neutron emission probabilities for neutron rich nuclei close to the N=82r-process path

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F. Montes1,2,4, A. Estrade1,2,4, P. T. Hosmer1,2,4, S. N. Liddick3,4,*, P. F. Mantica3,4, A. C. Morton4,†, W. F. Mueller4, M. Ouellette1,2,4, E. Pellegrini2,4, P. Santi4,‡, H. Schatz1,2,4, A. Stolz4, B. E. Tomlin3,4, O. Arndt5,6, K.-L. Kratz5,6, B. Pfeiffer5,6, P. Reeder7, W. B. Walters8, A. Aprahamian9, and A. Wöhr9
1Joint Institute for Nuclear Astrophysics, USA
2Dept. of Physics and Astronomy, Michigan State University, E. Lansing, Michigan 48824, USA
3Dept. of Chemistry, Michigan State University, E. Lansing, Michigan 48824, USA
4National Superconducting Cyclotron Laboratory, Michigan State University, E. Lansing, Michigan 48824, USA
5Institut für Kernchemie, Universität Mainz, Fritz-Strassmann Weg 2, D-55128 Mainz, Germany
6VISTARS–Virtuelles Institut der Struktur der Kerne und nuklearer Astrophysik, Mainz, Germany
7Richland, Washington 99352, USA
8Dept. of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
9Joint Institute for Nuclear Astrophysics, and Institute for Structure and Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46616, USA

Received 21 November 2005; published 10 March 2006

β-delayed neutron emission branchings (or upper limits) for neutron rich 116-120Rh, 120-122Pd, and 124Ag have been measured. These branching ratios serve as direct inputs to astrophysical rapid neutron capture process models and affect the final abundances calculated in these models. In addition, half-lives for neutron rich 114-115Tc, 114-118Ru, 116-121Rh, and 119-124Pd near the proposed path of the r-process have also been measured. The results agree with theoretical quasiparticle random-phase approximation calculations within model uncertainties; the only exception is the delayed neutron branching in the decay of 120Rh, which is found to be much smaller than predicted.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.73.035801
DOI:
10.1103/PhysRevC.73.035801
PACS:
21.10.Tg, 23.40.-s, 26.30.+k, 27.60.+j

*Current address: UNIRIB, Oak Ridge, TN, USA.

†Current address: TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 1R9 Canada.

‡Current address: Los Alamos National Laboratory, Safeguards Science and Technology Group (N-1), E540, Los Alamos, NM 87544, USA.

§http://www.vistars.de

**http://www.jinaweb.org

 
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