β-decay studies close to the N=82 r-process path

F. Montes, H. Schatz, A. Aprahamian, O. Arndt, A. Estrade, K. L. Kratz, S. N. Liddick, P. F. Mantica, W. F. Mueller, P. Hosmer, A. C. Morton, M. Ouellette, E. Pellegrini, B. Pfeiffer, P. Reeder, P. Santi, A. Stolz, B. E. Tomlin, W. B. Walters, A. Wöhr

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Abstract

New half-lives for neutron-rich ruthenium, rhodium and palladium isotopes close to the r-process path along the N=82 closed shell have been measured at the National Superconducting Cyclotron Laboratory at Michigan State University. The studied isotopes are close to the critical A=118-126 mass region in the astrophysical r-process, where incorrect nuclear structure development towards the shell closure may have the most pronounced effect on the abundances of elements produced. Neutron-rich nuclei were produced by fragmentation of a 120-MeV per nucleon 136Xe beam on Be and were separated by the A1900 fragment separator. The nuclei of interest were implanted into a double-sided Si strip detector at the center of the MSU β counting system. Charge states and fully- stripped isotopes were distinguished by a measurement of the total kinetic energy of each implant. Our measured half-lives will provide first clues on whether our understanding of nuclear structure evolution in this mass region is correct.

Original languageEnglish
Pages (from-to)643-646
Number of pages4
JournalNuclear Physics A
Volume758
Issue number1-4 SPEC. ISS.
DOIs
StatePublished - Jul 25 2005

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