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首页> 外文期刊>Physical review, C >Precision mass measurements of neutron-rich Co isotopes beyond N=40
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Precision mass measurements of neutron-rich Co isotopes beyond N=40

机译：超出N = 40的中子CO同位素的精确质量测量

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摘要

The region near Z = 28 and N = 40 is a subject of great interest for nuclear structure studies due to spectroscopic signatures in Ni-68 suggesting a subshell closure at N = 40. Trends in nuclear masses and their derivatives provide a complementary approach to shell structure investigations via separation energies. Penning trap mass spectrometry has provided precise measurements for a number of nuclei in this region; however, a complete picture of the mass surfaces has so far been limited by the large uncertainty remaining for nuclei with N 40 along the iron (Z = 26) and cobalt (Z = 27) chains because these species are not available from traditional isotope separator online rare isotope facilities. The Low-Energy Beam and Ion Trap Facility at the National Superconducting Cyclotron Laboratory is the first and only Penning trap mass spectrometer coupled to a fragmentation facility and therefore presents the unique opportunity to perform precise mass measurements of these elusive isotopes. Here we present the first Penning trap measurements of Co-68,Co-69, carried out at this facility. Some ambiguity remains as to whether the measured values are ground-state or isomeric-state masses. A detailed discussion is presented to evaluate this question and to motivate future work. In addition, we perform ab initio calculations of ground-state and two-neutron separation energies of cobalt isotopes with the valence-space in-medium similarity renormalization group approach based on a particular set of two-and three-nucleon forces that predict saturation in infinite matter. We discuss the importance of these measurements and calculations for understanding the evolution of nuclear structure near Ni-68.
机译：Z = 28和n = 40附近的区域是由于NI-68中的光谱签名，核结构研究的群体是核结构研究的主题，这表明在N = 40处闭合闭合。核心群及其衍生物的趋势提供了壳体的互补方法通过分离能量的结构调查。捏阱质谱法为该地区的许多核提供了精确的测量值;然而，到目前为止，肿块表面的完整图像受到N＆GT的核的大不确定性的限制。 40沿铁（Z = 26）和钴（Z = 27）链，因为这些物种不能从传统的同位素分离器在线罕见同位素设施。国家超导回旋毒实验室的低能量梁和离子阱设施是耦合到碎片设施的第一和唯一捕获陷阱质谱仪，因此呈现了对这些难以置心的同位素进行精确的质量测量的独特机会。在这里，我们介绍了在该设施进行的CO-68，CO-69的第一个占用陷阱测量。一些模糊性仍然是测量值是否是地面状态或异构状态质量。提出了详细讨论以评估这个问题并激励未来的工作。此外，我们基于预测饱和的特定两种和三核力力，对钴同位素的地面和两中子分离能量进行地面和两个中子分离能量的AB初始和两中子分离能量。无限的物质。我们讨论了这些测量和计算了解NI-68附近的核结构演变的重要性。

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  • 来源
    《Physical review, C》 |2018年第1期|共7页
  • 作者

    Izzo C.; Bollen G.; Brodeur M.; Eibach M.; Gulyuz K.; Holt J. D.; Kelly J. M.; Redshaw M.; Ringle R.; Sandler R.; Schwarz S.; Stroberg S. R.; Sumithrarachchi C. S.; Valverde A. A.; Villari A. C. C.;

  • 作者单位

    Michigan State Univ Dept Phys &

    Astron E Lansing MI 48824 USA;

    Michigan State Univ Dept Phys &

    Astron E Lansing MI 48824 USA;

    Univ Notre Dame Dept Phys Notre Dame IN 46556 USA;

    Natl Superconducting Cyclotron Lab E Lansing MI 48824 USA;

    Natl Superconducting Cyclotron Lab E Lansing MI 48824 USA;

    TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada;

    Univ Notre Dame Dept Phys Notre Dame IN 46556 USA;

    Natl Superconducting Cyclotron Lab E Lansing MI 48824 USA;

    Natl Superconducting Cyclotron Lab E Lansing MI 48824 USA;

    Michigan State Univ Dept Phys &

    Astron E Lansing MI 48824 USA;

    Natl Superconducting Cyclotron Lab E Lansing MI 48824 USA;

    TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada;

    Natl Superconducting Cyclotron Lab E Lansing MI 48824 USA;

    Michigan State Univ Dept Phys &

    Astron E Lansing MI 48824 USA;

    Facil Rare Isotope Beams E Lansing MI 48824 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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