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

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

IDS

Collaboration

•

R. Lica
(
- Bucharest, IFIN-HH and
- CERN
)

Aug 30, 2019

11 pages

Published in:

Phys.Rev.C 100 (2019) 3, 034306

Published: Sep 12, 2019

e-Print:

1908.11626 [nucl-ex]

DOI:

10.1103/PhysRevC.100.034306

View in:

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Abstract: (APS)

The structure of Si34 was studied through γ spectroscopy separately in the β− decays of Mg34 and Al34 at the ISOLDE facility of CERN. Different configurations in Si34 were populated independently from the two recently identified β-decaying states in Al34 having spin-parity assignments Jπ=4− dominated by the normal configuration π(d5/2)−1⊗ν(f7/2) and Jπ=1+ by the intruder configuration π(d5/2)−1⊗ν(d3/2)−1(f7/2)2. The paper reports on spectroscopic properties of Si34 such as an extended level scheme, spin and parity assignments based on log(ft) values and γ-ray branching ratios, absolute β 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 Si34. Large scale shell-model calculations using the 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 SDPF-U-MIX, the N=20 shell gap, the level of mixing between normal and intruder configurations for the 01+, 02+, and 21+ states, and the absence of triaxial deformation in Si34.

Nuclear Structure

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