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In-beam gamma-ray spectroscopy of Mn-63

机译：MN-63的束射伽马射线光谱

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Background: Neutron- rich, even- mass chromium and iron isotopes approaching neutron number N = 40 have been important benchmarks in the development of shell- model effective interactions incorporating the effects of shell evolution in the exotic regime. Odd- mass manganese nuclei have received less attention, but provide important and complementary sensitivity to these interactions. Purpose: We report the observation of two new. gamma-ray transitions in Mn-63, which establish the ( 9/ 2(-)) and ( 11/ 2-) levels on top of the previously known ( 7/ 2-) first-excited state. The lifetime for the ( 7/ 2-) and ( 9/ 2-) excited states were determined for the first time, while an upper limit could be established for the ( 11/ 2-) level. Method: Excited states in 63Mn have been populated in inelastic scattering from a Be-9 target and in the fragmentation of Fe-65.gamma gamma coincidence relationships were used to establish the decay level scheme. A Doppler line- shape analysis for the Doppler- broadened ( 7/ 2-)-> 5/ 2-, ( 9/ 2-)-> (7/2(-)), and ( 11/ 2-)-> (9/2(-)) transitions was used to determine ( limits for) the corresponding excited- state lifetimes. Results: The low- lying level scheme and the excited- state lifetimes were compared with large- scale shell- model calculations using different model spaces and effective interactions in order to isolate important aspects of shell evolution in this region of structural change. Conclusions: While the theoretical ( 7/ 2-) and ( 9/ 2-) excitation energies show little dependence on the model space, the calculated lifetime of the ( 7/ 2-) level and calculated energy of the ( 11/ 2-) level reveal the importance of including the neutron g9/ 2 and d5/ 2 orbitals in the model space. The LNPS effective shell- model interaction provides the best overall agreement with the new data.
机译：背景：富含中子数N = 40的中子，均多铬和铁同位素在开发外壳演化中的壳种有效相互作用的发展中是重要的基准。奇数锰核感受不太关注，但为这些相互作用提供重要和互补的敏感性。目的：我们报告了两个新的观察。 Mn-63中的γ射线过渡，其在先前已知的（7/2-）的第一激发状态的顶部建立（9/2（ - ））和（11/2-）水平。第一次确定（7/2-）和（9 / 2-）激发态的寿命，而可以为（11/2-）水平建立上限。方法：63Mn中的激发态已填充在来自BE-9目标的无弹性散射中，并且在Fe-65.Gamma伽玛巧合关系中用于建立衰减水平方案。多普勒 - 扩大（7/2 - ） - > 5 / 2-，（9/2 - ） - >（7/2（ - ））和（11/2 - ） - >的多普勒线形分析（9/2（ - ））过渡用于确定相应的激发态生命周期的（限制）。结果：利用不同模型空间和有效相互作用将低洼水平方案和兴奋状态的寿命与大规模的贝壳模型计算进行比较，以隔离结构变化区域的壳体演变的重要方面。结论：虽然理论（7/2-）和（9/2-）激励能量略微对模型空间的依赖，但计算的寿命（7/2-）水平和计算能量（11/2- ）水平揭示了模型空间中中子G9 / 2和D5 / 2轨道的重要性。 LNP有效的壳牌模型交互提供了与新数据的最佳总体协议。

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  • 来源
    《Physical review, C》 |2016年第1期|共7页
  • 作者

    Baugher T.; Gade A.; Janssens R. V. F.; Lenzi S. M.; Bazin D.; Carpenter M. P.; Chiara C. J.; Deacon A. N.; Freeman S. J.; Grinyer G. F.; Hoffman C. R.; Kay B. P.; Kondev F. G.; Lauritsen T.; Lunderberg E. M.; McDaniel S.; Meierbachtol K. C.; Ratkiewicz A.; Stroberg S. R.; Walsh K. A.; Weisshaar D.; Zhu S.;

  • 作者单位

    Michigan State Univ Natl Supercond Cyclotron Lab E Lansing MI 48824 USA;

    Michigan State Univ Natl Supercond Cyclotron Lab E Lansing MI 48824 USA;

    Argonne Natl Lab Div Phys Argonne IL 60439 USA;

    Dipartimento Fis &

    Astron Univ I-35131 Padua Italy;

    Michigan State Univ Natl Supercond Cyclotron Lab E Lansing MI 48824 USA;

    Argonne Natl Lab Div Phys Argonne IL 60439 USA;

    Argonne Natl Lab Div Phys Argonne IL 60439 USA;

    Univ Manchester Sch Phys &

    Astron Manchester M13 9PL Lancs England;

    Univ Manchester Sch Phys &

    Astron Manchester M13 9PL Lancs England;

    CEA DSM CNRS IN2P3 GANIL Bvd Henri Becquerel F-14076 Caen France;

    Argonne Natl Lab Div Phys Argonne IL 60439 USA;

    Argonne Natl Lab Div Phys Argonne IL 60439 USA;

    Argonne Natl Lab Nucl Engn Div 9700 S Cass Ave Argonne IL 60439 USA;

    Argonne Natl Lab Div Phys Argonne IL 60439 USA;

    Michigan State Univ Natl Supercond Cyclotron Lab E Lansing MI 48824 USA;

    Michigan State Univ Natl Supercond Cyclotron Lab E Lansing MI 48824 USA;

    Michigan State Univ Natl Supercond Cyclotron Lab E Lansing MI 48824 USA;

    Michigan State Univ Natl Supercond Cyclotron Lab E Lansing MI 48824 USA;

    Michigan State Univ Natl Supercond Cyclotron Lab E Lansing MI 48824 USA;

    Michigan State Univ Natl Supercond Cyclotron Lab E Lansing MI 48824 USA;

    Michigan State Univ Natl Supercond Cyclotron Lab E Lansing MI 48824 USA;

    Argonne Natl Lab Div Phys Argonne IL 60439 USA;

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  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
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