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Sn and spin-orbit splitting in neutron-rich nucleiOrlandi, R.; Pain, S. D.*; Ahn, S.*; Jungclaus, A.*; Schmitt, K. T.*; Bardayan, D. W.*; Catford, W. N.*; Chapman, R.*; Chipps, K. A.*; Cizewski, J. A.*; et al.
Physics Letters B, 785, p.615 - 620, 2018/10
被引用回数：7 パーセンタイル：52.71(Astronomy & Astrophysics)Low-lying neutron-hole states in Sn were populated via the 
Sn(d,t) reaction at Oak Ridge National Laboratory. The triton angular distributions were compared to DWBA calculations and revealed spectroscopic factors compatible with a single-hole nature of the states populated. The data permit to determine the spin-orbit splitting of the strongly bound 
and 
neutron orbits below the shell gap, which was compared to the splitting of the weakly bound 3
and 2
orbits above the gap. The comparison revealed a smaller energy splitting of the 3 orbits. All splittings were reproduced using Woods-Saxon calculations, and the lower splitting of the 3 orbits was explained to arise from the large radial extent of the wavefunction and small value of the amplitude at the surface. This result is important to understand at a fundamental level the spin-orbit interaction, and its effects on neutron-rich nuclei.
大木 繁夫; Massimo Ma*; Peter Smit*; Robert Jac*; Roland Sou*
Proceedings of European Nuclear Conference (ENC'98), Vol.2, 0 Pages, 1998/00
高速炉はプルトニウム(以下Pu)を用いることによる最大エネルギー生産の鍵となるとともに、保管物質の潜在的な毒性の削減による環境に対する負荷軽減の性能を有している。CAPRA酸化物燃料レファレンス炉心は上記目的を達成するために設計され、開発の第一段階として大量のPuの消費が目標としてあげられている。これよりPu燃焼を効率よく行うための高いPu富化度(35%)が本炉心の重要な特徴となっている。本論文ではCEAカダラッシュの臨界集合体MASURCAを用いて行われたPu燃焼炉のための臨界実験(CIRANO実験計画)の中で、Pu富化度を段階的に増加させた一連の実験に関する解析結果について述べる。本実験解析によって、新しい高速炉設計のための核データ及び解析コードの妥当性の確認が行われるとともに、CAPRA酸化物燃料レファレンス炉心における許容マージンに関する情報が与えられた。
Sn studied via the Sn(d,t)Sn reactionOrlandi, R.; Pain, S. D.*; Bardayan, D. W.*; Gross, C. J.*; Smith, M. S.*; Jungclaus, A.*; Ahn, S.*; Jones, K. L.*; Pittman, S. T.*; Schmitt, K. T.*; et al.
no journal, ,
Knowledge of single-particle energies in the vicinity of exotic doubly-magic nuclei is of critical importance to understand evolution of nuclear structure. In the present work, the Sn(d,t)Sn reaction (Q=-1.055 MeV) was studied in inverse kinematics at HRIBF of Oak Ridge National Laboratory. The Sn ISOL beam was post-accelerated to an energy of 4.39 MeV/u using the ORNL HRIBF accelerator. The beam (average intensity of 
1.2e4 pps) impinged on a 250 
g/cm
deuterated polyethylene target, for approximately 4 days. Ejected tritons were detected using the Super ORRUBA array of segmented Si telescopes. Low-lying states in Sn were populated in the experiment. Preliminary results will be shown.
