Cross-shell excited configurations in the structure of 34Si
- Resource Type
- Working Paper
- Authors
- Lubna, R. S.; Garnsworthy, A. B.; Tripathi, Vandana; Ball, G. C.; Natzke, C. R.; Rocchini, M.; Andreoiu, C.; Bhattacharjee, S. S.; Dillmann, I.; Garcia, F. H.; Gillespie, S. A.; Hackman, G.; Griffin, C. J.; Leckenby, G.; Miyagi, T.; Olaizola, B.; Porzio, C.; Rajabali, M. M.; Saito, Y.; Spagnoletti, P.; Tabor, S. L.; Umashankar, R.; Vedia, V.; Volya, A.; Williams, J.; Yates, D.
- Source
- Phys. Rev. C 109, 014309 (2024)
- Subject
- Nuclear Experiment
- Language
The cross-shell excited states of $^{34}$Si have been investigated via $\beta$-decays of the $4^-$ ground state and the $1^+$ isomeric state of $^{34}$Al. Since the valence protons and valence neutrons occupy different major shells in the ground state as well as the intruder $1^+$ isomeric state of $^{34}$Al, intruder levels of $^{34}$Si are populated via allowed $\beta$ decays. Spin assignments to such intruder levels of $^{34}$Si were established through $\gamma$-$\gamma$ angular correlation analysis for the negative parity states with dominant configurations $(\nu d_{3/2})^{-1} \otimes (\nu f_{7/2})^{1}$ as well as the positive parity states with dominant configurations $(\nu sd)^{-2} \otimes (\nu f_{7/2}p_{3/2})^2$. 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 $^{34}$Si. Shell model interaction derived from a more fundamental theory with the Valence Space In Medium Similarity Renormalization Group (VS-IMSRG) method was also employed to interpret the structure of $^{34}$Si.