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Free keywords:
20 ≤ A ≤ 38, Beta decay, Isomer decays, Nuclear structure & decays, Shell model
MPINP:
Starke Wechselwirkung und exotische Kerne – Abteilung Blaum
Abstract:
The cross-shell excited states of 34Si have been investigated via β decays of the 4− ground state and the 1+ isomeric state of 34Al. Since the valence protons and valence neutrons occupy different major shells in the ground state as well as the intruder 1+ isomeric state of 34Al, intruder levels of 34Si are populated via allowed β decays. Spin assignments to such intruder levels of 34Si were established through γ−γ angular correlation analysis for the negative-parity states with dominant configurations (νd3/2)−1⊗(νf7/2)1 as well as the positive-parity states with dominant configurations (νsd)−2⊗(νf7/2p3/2)2. The configurations of such intruder states play crucial roles in our understanding of the N=20 shell gap evolution. A configuration interaction model derived from the FSU Hamiltonian was utilized in order to interpret the intruder states in 34Si. Shell model interaction derived from a more fundamental theory with the valence space in medium similarity renormalization group method was also employed to interpret the structure of 34Si.
