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Phys. Rev. C 70, 034314 (2004) [5 pages]

Probing the sustainability of the N=82 and Z=50 shell closures for neutron-rich nuclides: Decay of 120Rh75 to levels of 120Pd74

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W. B. Walters1, B. E. Tomlin2,3, P. F. Mantica2,3, B. A. Brown2,4, J. Rikovska Stone1,5, A. D. Davies2,4, A. Estrade4,6, P. T. Hosmer2,4, N. Hoteling1, S. N. Liddick2,3, T. J. Mertzimekis2, F. Montes2,4, A. C. Morton2, W. F. Mueller2, M. Ouellette2,4,6, E. Pellegrini4,6, P. Santi2, D. Seweryniak7, H. Schatz2,4,6, J. Shergur1, and A. Stolz2
1Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
2National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
3Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
4Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
5Department of Physics, Oxford University, Oxford, UK OXI 3PU United Kingdom
6Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
7Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

Received 9 June 2004; published 28 September 2004

The low-energy levels of 120Pd74 were populated by β decay of 120Rh75 , which was produced via projectile fragmentation of a 136Xe82 beam at 120  MeV∕nucleon . Delayed β -gated γ rays with energies of 438 and 618  keV were observed in coincidence with 120Rh75 fragments and assigned to the 21+→0+ and 41+→21+ transitions, respectively, in 120Pd74 . Isomeric γ -ray transitions are also reported for 120Rh75 and 126Cd78 . The low-energy structure of 120Pd74 shows remarkable similarity to those of the isotopic 108Pd62 and isotonic 128Xe74 suggesting that these nuclides share the same Z=50 and N=82 closed shell structures with neutron-rich 120Pd74 .


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.70.034314
DOI: 10.1103/PhysRevC.70.034314
PACS: 23.40.-s, 23.20.Lv, 21.60.Ev, 27.60.+j

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