Cross-shell excited configurations in the structure of 34Si
Phys. Rev. C 109, 014309 (2024) 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 i...
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Zusammenfassung: | Phys. Rev. C 109, 014309 (2024) 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. |
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DOI: | 10.48550/arxiv.2401.04195 |