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

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  • R. Lica
  • F. Rotaru
  • M. J.G. Borge
  • S. Grévy
  • F. Negoiţǎ
  • A. Poves
  • O. Sorlin
  • 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. Mǎrginean
  • R. 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


Publication details

JournalPhysical Review C
DateAccepted/In press - 28 Aug 2019
DatePublished (current) - 11 Sep 2019
Issue number3
Number of pages11
Original languageEnglish


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.

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