Nuclear structure investigations in the A ≈ 30 mass region

Experimental results for the structure of nuclei in the mass region A ≈ 30 are presented. The first part of the paper is dedicated to the mirror nuclei 31S and 31P. In the second part we focus on the structure of the N=Z nucleus of 30P. Excited states in the 30P, 31P and 31S were populated in the same experiment as the 1pn, 1p and 1n exit channels of the reaction 20Ne + 12C, respectively. The 20Ne beam accelerated to an energy of 33 MeV was delivered by the Piave-Alpi accelerator of the Laboratori Nazionali di Legnaro. Results for branching ratios measurements, angular correlations analysis of coincident γ-rays as well as Doppler-shift attenuation lifetime measurements are reported. The γ-rays were detected using the multi-detector array GASP with the EUCLIDES charged particle detector. The isospin symmetry in A=31 mirror nuclei was investigated using the Equation of Motion method based on a chiral potential and including two- and three-body forces. The level scheme and branching ratios for the positive parity band in the N=Z nucleus of 30P are well reproduced by the shell model calculations.