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Lic, R.*; Rotaru, F.*; Borge, M. J. G.*; Grvy, S.*; Negoita, F.*; Poves, A.*; Sorlin, O.*; Andreyev, A. N.; Borcea, R.*; Costache, C.*; et al.
Physical Review C, 95(2), p.021301_1 - 021301_6, 2017/02
被引用回数:18 パーセンタイル:80.37(Physics, Nuclear)The decay of Mg was used to study the Al nucleus through spectroscopy at the Isotope Separator On-Line facility of CERN. Previous studies identified two -decaying states in Al having spin-parity assignments =4 dominated by the normal configuration (d5/2) (f7/2) and = 1 by the intruder configuration (d5/2) (d3/2)(f7/2). Their unknown ordering and relative energy have been the subject of debate for the placement of Al inside or outside the = 20 "island of inversion". We report here that the 1 intruder lies only 46.6 keV above the 4 ground state. In addition, a new half-life of =44.9(4)ms, that is twice as long as thepreviously measured 20(10) ms, has been determined for Mg. Large-scale shell-model calculations with the recently developed SDPF-U-MIX interaction are compared with the new data and used to interpret the mechanisms at play at the very border of the = 20 island of inversion.
Buiron, L.*; Rimpault, G*; Fontaine, B.*; Kim, T. K.*; Stauff, N. E.*; Taiwo, T. A.*; 山路 哲史*; Gulliford, J.*; Fridmann, E.*; Pataki, I.*; et al.
Proceedings of International Conference on the Physics of Reactors; The Role of Reactor Physics toward a Sustainable Future (PHYSOR 2014) (CD-ROM), 16 Pages, 2014/09
OECDの国際協力活動で実施中の大型ナトリウム冷却高速炉の核特性ベンチマークについて、複数の研究機関の参加者の評価結果を取りまとめた。反応度、同位体組成燃焼変化、反応度フィードバック、反応率分布について、異なる計算手法により評価された。参加者間の計算スキームの違いにかかわらず、燃焼組成、遅発中性子割合、ドップラー反応度係数、ナトリウムボイド反応度については、参加者間でよい一致を見た。しかしながら、臨界性に対しては、大きな差異が見られた。これは、計算手法の違いによるものではなく、使用した核データライブラリの違いによるものである。