Study of theV50Nucleus with the (He3,d), (He3,α), (He3,p), and (He3,pγ) Reactions

Abstract
The nucleus V50 has been studied with the Ti49(He3,d), V51(He3,α), Ti48(He3,p), and Ti48(He3,pγ) reactions induced by the He++3 beam from the Argonne tandem Van de Graaff. The (He3,d), (He3,α), and (He3,p) angular distributions at E(He3)=22 MeV and with 20-, 30-, and 75-keV over-all resolution, respectively, have been analyzed with the distorted-wave Born approximation. The (He3,p) and (He3,pγ) reactions were also studied at 13 MeV to obtain the γ decay of V50 levels (including two 0+ isobaric analog states) in which the neutron-proton pair is transferred with zero orbital angular momentum. The two 0+ isobaric analog states are observed to decay by M1 transitions to two different low-lying 1+ states, one of which is f72 and the other is a complex configuration. Several levels between 1.3- and 4-MeV excitation energy are seen to decay in part to the 1+ levels populated by decay of the two 0+ analog states. The V50 levels at 1.333 and 1.490 MeV are assigned 1+, and the previous tentative spin assignments 5+, 4+, 3+, and 2+ of the first four excited states are supported. All available data are used to evaluate two models: (1) the truncated 1f72 shell model of McCullen, Bayman, and Zamick and (2) the Coriolos-coupling model of Wasielewski and Malik.

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