Abstract
Excitation functions of the40Ca(p,p 2γ) triple angular correlations have been measured in the region of an intermediate structure centered atE 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 thep 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-1h doorway states in which a 2p 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 2p 1/2 single-particle state in the 3− channel, is suggested.
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