A (p, p'γ) angular correlation study of an intermediate structure in the 3- exit channel of 40Ca + p

Excitation functions of the 40Ca(p,p2γ) triple angular correlations have been measured in the region of an intermediate structure centered at Esub(p) = 6.25 MeV, for 12 pairs of proton and gamma detector positions. The angular correlations are consistent with the spin 5/2 assigned for these resonances and have established the psub(1/2) partial wave as the main decay mode of the intermediate structure in the 3- inelastic channel. These results are strongly supporting the description of the structure observed in the 3- exit channel as consisting of 2p-1 h doorway states in which a 2psub(1/2) single-particle state weakly coupled to 3- excited core is split by residual interactions. An improved dynamical treatment, aimed to obtain the strength function of the 2psub(1/2) single-particle state in the 3- channel, is suggested. (orig.)