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Unveiling the intruder deformed 0$^+_2$ state in $^{34}$Si

Abstract : The 0$^+_2$ state in $^{34}$Si has been populated at the {\sc Ganil/Lise3} facility through the $\beta$-decay of a newly discovered 1$^+$ isomer in $^{34}$Al of 26(1)~ms half-life. The simultaneous detection of $e^+e^-$ pairs allowed the determination of the excitation energy E(0$^+_2$)=2719(3)~keV and the half-life T$_{1/2}$=19.4(7)~ns, from which an electric monopole strength of $\rho^2$(E0)=13.0(0.9)$\times$10$^{-3}$ was deduced. The 2$^+_1$ state is observed to decay both to the 0$^+_1$ ground state and to the newly observed 0$^+_2$ state (via a 607(2)~keV transition) with a ratio R(2$^+_1$$\rightarrow$0$^+_1$/2$^+_1$$\rightarrow$0$^+_2$)=1380(717). Gathering all information, a weak mixing with the 0$^+_1$ and a large deformation parameter of $\beta$=0.29(4) are found for the 0$^+_2$ state, in good agreement with shell model calculations using a new {\sc sdpf-u-mix} interaction allowing \textit{np-nh} excitations across the $N=20$ shell gap.
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Preprints, Working Papers, ...
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http://hal.in2p3.fr/in2p3-00712670
Contributor : Michel Lion <>
Submitted on : Wednesday, June 27, 2012 - 4:43:29 PM
Last modification on : Monday, June 7, 2021 - 10:02:05 AM
Long-term archiving on: : Friday, September 28, 2012 - 2:45:31 AM

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  • HAL Id : in2p3-00712670, version 1
  • ARXIV : 1206.6572

Citation

F. Rotaru, F. Negoita, S. Grévy, J. Mrazek, S. Lukyanov, et al.. Unveiling the intruder deformed 0$^+_2$ state in $^{34}$Si. 2012. ⟨in2p3-00712670v1⟩

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