Normal and intruder configurations in ${}^{34}$Si populated in the ${\beta }^{-}$ decay of ${}^{34}$Mg and ${}^{34}$Al

Abstract

The structure of ${}^{34}$Si was studied through $\gamma$ spectroscopy separately in the ${\beta }^{-}$ decays of ${}^{34}$Mg and ${}^{34}$Al at the ISOLDE facility of CERN. Different configurations in ${}^{34}$Si were populated independently from the two recently identified $\beta$-decaying states in ${}^{34}$Al having spin-parity assignments $J^{\pi }=4^{-}$ dominated by the normal configuration $\pi (d_{5/2}{)}^{-1}\otimes \nu (f_{7/2})$ and $J^{\pi }=1^{+}$ by the intruder configuration $\pi (d_{5/2}{)}^{-1}\otimes \nu (d_{3/2}{)}^{-1}(f_{7/2}{)}^2$. The paper reports on spectroscopic properties of ${}^{34}$Si such as an extended level scheme, spin and parity assignments based on log($ft$) values and $\gamma$-ray branching ratios, absolute $\beta$ feeding intensities and neutron emission probabilities. A total of 11 newly identified levels and 26 transitions were added to the previously known level scheme of ${}^{34}$Si. Large scale shell-model calculations using the {\sc sdpf-u-mix} interaction, able to treat higher order intruder configurations, are compared with the new results and conclusions are drawn concerning the predictive power of {\sc sdpf-u-mix}, the $N=20$ shell gap, the level of mixing between normal and intruder configurations for the 0${}_1^{+}$, 0${}_2^{+}$ and 2${}_1^{+}$ states and the absence of triaxial deformation in ${}^{34}$Si.

References in corpus (5)

• Nuclear magic numbers: new features far from stability
• Discovery of the shape coexisting 0+ state in 32Mg by a two neutron transfer reaction
• A proton density bubble in the doubly magic ${}^{34}$Si nucleus
• Unveiling the intruder deformed 0${}_2^{+}$ state in ${}^{34}$Si
• Symmetry conserving configuration mixing method with cranked states

Cited by in corpus (5)

• The Neutron-Rich Edge of the Nuclear Landscape. Experiment and Theory
• The Structure of ${}^{33}$Si and the magicity of the N=20 gap at Z=14
• In-beam $\gamma$-ray spectroscopy of ${}^{32}$Mg via direct reactions
• Cross-shell excited configurations in the structure of 34Si
• Coexisting normal and intruder configurations in ${}^{32}$Mg