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Phys. Rev. C 65, 064307 (2002) [16 pages]

T=0 and T=1 states in the odd-odd N=Z nucleus, 3570Br35

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D. G. Jenkins1,2,*, N. S. Kelsall3, C. J. Lister2, D. P. Balamuth1, M. P. Carpenter2, T. A. Sienko2, S. M. Fischer4, R. M. Clark5, P. Fallon5, A. Görgen5, A. O. Macchiavelli5, C. E. Svensson5, R. Wadsworth3, W. Reviol6, D. G. Sarantites6, G. C. Ball7, J. Rikovska Stone8,9, O. Juillet10, P. Van Isacker10, A. V. Afanasjev2,11,12, and S. Frauendorf11,13
1Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104
2Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
3Department of Physics, University of York, Heslington, York YO1 5DD, United Kingdom
4Department of Physics, DePaul University, Chicago, Illinois 60614
5Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
6Department of Chemistry, Washington University, St. Louis, Missouri 63130
7TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
8Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
9Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
10Grand Accélérateur National d’Ions Lourds, Boîte Postale 55027, F-14076 Caen Cedex 5, France
11Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
12Laboratory of Radiation Physics, Institute of Solid State Physics, University of Latvia, LV 2169 Salaspils, Miera str. 31, Latvia
13IKH, Rossendorf Research Centre, PB 51 01 19, D-01314 Dresden, Germany

Received 18 January 2002; published 28 May 2002

Excited states in 70Br were populated in the 40Ca(32S,pn) reaction at Ebeam=80–100 MeV and the 40Ca(36Ar,αpn) reaction at Ebeam=145 MeV. The resulting gamma decay was detected using the Gammasphere array triggered by a 30-element neutron detector. The cross-bombardment allowed the unambiguous assignment of levels to 70Br, comprising a total of 32 states built both on the Jπ=0+ ground state and a previously known Jπ=9+ isomer, which is located at an excitation energy of 2293 keV by the observation of linking transitions. The structures are discussed within the context of the two-quasiparticle plus rotor model, the IBM-4 model and the cranked Nilsson-Strutinsky formalism. The nonobservation of a doublet of J=0, T=1 and J=1, T=0 states at low excitation in 70Br is indicative that T=0 proton-neutron pairing strength is weak in comparison to T=1 pairing.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.65.064307
DOI:
10.1103/PhysRevC.65.064307
PACS:
21.10.Hw, 21.10.Re, 23.20.Lv, 27.50.+e

*Present address: Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 3BX, United Kingdom.

 
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