| Thème(s) : |
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Physique/Physique Nucléaire Expérimentale
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| Titre : |
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Unveiling the intruder deformed 0$^+_2$ state in $^{34}$Si |
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| Auteur : |
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F. Rotaru, F. Negoita, S. Grévy1, J. Mrazek, S. Lukyanov, F. Nowacki2, A. Poves, O. Sorlin1, C. Borcea, R. Borcea, A. Buta, L. Caceres1, S. Calinescu, R. Chevrier3, Zs. Dombradi, J.M. Daugas3, D. Lebhertz1, Y. Penionzhkevich, C. Petrone, D. Sohler, M. Stanoiu, J.C. Thomas1 |
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| Laboratoire : |
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| Résumé : |
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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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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication
ou d'écriture : |
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2012 |
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| Nom du périodique : |
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| Physical Review Letters (Phys. Rev. Lett.) |
| Publisher |
American Physical Society |
| ISSN |
0031-9007 (eISSN : 1079-7114) |
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| Volume : |
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109 |
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| Page/Article : |
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092503 |
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| Identifiant local : |
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GANIL P 2012-08, GANIL 2012-099 A |
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| Classification PACS : |
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23.35.+g,23.40.-s,23.20.Lv,27.30.+t |
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| Commentaire : |
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5 pages, 3 figures, Expérience GANIL/LISE3 |
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