LICA, R.; ROTARU, F.; BORGE, M.J.G.; GREVY, S.; NEGOITA, F.; POVES, A.; SORLIN, O.; ANDREYEV, A.N.; BORCEA, R.; COSTACHE, C.; DE WITTE, H.; FRAILE, L.M.; GREENLEES, P.T.; HUYSE, M.; IONESCU, A.; KISYOV, S.; KONKI, J.; LAZARUS, I.; MADURGA, M.; MARGINEAN, N.; MARGINEAN, R.; MIHAI, C.; MIHAI, R.E.; NEGRET, A.; NOWACKI, F.; PAGE, R.D.; PAKARINEN, J.; PUCKNELL, V.; RAHKILA, P.; RAPISARDA, E.; SERBAN, A.; SOTTY, C.O.; STAN, L.; STANOIU, M.; TENGBLAD, O.; TURTURICA, A.; VAN DUPPEN, P.; WARR, N.; DESSAGNE, Ph.; STORA, T.; BORCEA, C.; CALINESCU, S.; DAUGAS, J.M.; FILIPESCU, D.; KUTI, I.; FRANCHOO, S.; GHEORGHE, I.; MORFOUACE, P.; MOREL, Pierre; MRAZEK, J.; PIETREANU, D.; SOHLER, D.; STEFAN, I.; SUVAILA, R.; TOMA, S.; UR, C.A.

doi:10.1103/PhysRevC.100.034306

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Phys.Rev.C. 2019, vol. 100, n° 3, p. 034306

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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.< Réduire

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Nuclear Structure

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

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