Spectroscopy of the N = 27 doubly odd nuclei through the J-dependence of the (3He, t) reaction

The doubly odd nuclei 48 Sc, 50 V, 52 Mn and 54 Co have been studied by the charge exchange reaction ( 3 He, t) on 48 Ca, 50 Ti, 52 Cr and 54 Fe enriched targets. In addition to the analogue state of the target ground state, we observed a great number of low-lying energy levels, especially those which can be described by the [( f 7 2 ) p ( f 7 2 ) n −1 ] configuration. For these levels we got angular distributions from 10° to 70° c.m. We observed that these angular distributions show a typical pattern for each value of the total transferred angular momentum J as shown by levels of 48 Sc, 52 Mn and 54 Co for which spins are already known. This property allowed us to propose J -values for the more excited levels. Thus, most of the components of the [( f 7 2 ) p ( f 7 2 ) n −1 ] multiplet have been identified in 48 Sc, 50 V and 52 Mn. For 48 Sc, angular distributions are practically identical at 18.5 and 30.2 MeV. It seems that the ( 3 He, t) reaction at 30.2 MeV on N = 28 targets proceeds through an apparently quite simple mechanism.