T=0 and T=1 States in the Odd-Odd N=Z Nucleus, 7035Br35

Jenkins, D. G.; Kelsall, N. S.; Lister, C. J.; Balamuth, D. P.; Carpenter, M. P.; Sienko, T. A.; Fischer, S. M.; Clark, R. M.; Fallon, P.; Görgen, A.; Macchiavelli, A. O.; Svensson, C. E.; Wadsworth, R.; Reviol, W.; Sarantites, D. G.; Ball, G. C.; Rikovska Stone, J.; Juillet, O.; Isacker, P. van; Afanasjev, A. V.; Frauendorf, S.

T=0 and T=1 States in the Odd-Odd N=Z Nucleus, ⁷⁰₃₅Br₃₅

Jenkins, D. G.; Kelsall, N. S.; Lister, C. J.; Balamuth, D. P.; Carpenter, M. P.; Sienko, T. A.; Fischer, S. M.; Clark, R. M.; Fallon, P.; Görgen, A.; Macchiavelli, A. O.; Svensson, C. E.; Wadsworth, R.; Reviol, W.; Sarantites, D. G.; Ball, G. C.; Rikovska Stone, J.; Juillet, O.; van Isacker, P.; Afanasjev, A. V.; Frauendorf, S.

Excited states in ⁷⁰Br were populated in the ⁴⁰Ca(³²S,pn) reaction at E_beam = 80-100 MeV and the ⁴⁰Ca(³⁶Ar, αpn) reaction at E_beam = 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 J^π=0⁺ ground state and a previously known J^π=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.

Phys. Rev. C 65 (2002) 064307

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