Normal and intruder configurations in Si 34 populated in the β- Decay of Mg 34 and Al 34

R. Lica, F. Rotaru, M. J.G. Borge, S. Grévy, F. Negoiţǎ, A. Poves, O. Sorlin, A. N. Andreyev, R. Borcea, C. Costache, H. De Witte, L. M. Fraile, P. T. Greenlees, M. Huyse, A. Ionescu, S. Kisyov, J. Konki, I. Lazarus, M. Madurga, N. MǎrgineanR. Mǎrginean, C. Mihai, R. E. Mihai, A. Negret, F. Nowacki, R. D. Page, J. Pakarinen, V. Pucknell, P. Rahkila, E. Rapisarda, A. Şerban, C. O. Sotty, L. Stan, M. Stǎnoiu, O. Tengblad, A. Turturicǎ, P. Van Duppen, N. Warr, Ph Dessagne, T. Stora, C. Borcea, S. Cǎlinescu, J. M. Daugas, D. Filipescu, I. Kuti, S. Franchoo, I. Gheorghe, P. Morfouace, P. Morel, J. Mrazek

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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.

Original languageEnglish
Article number034306
Number of pages11
JournalPhysical Review C
Issue number3
Publication statusPublished - 11 Sept 2019

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