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首页> 外文会议>8th International Conference on Isotopes 2014 >Mapping the N=152 Deformed Shell Closure with High-Precision Penning-Trap Mass Measurements of Transuranium Nuclides at TRIGA-TRAP
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Mapping the N=152 Deformed Shell Closure with High-Precision Penning-Trap Mass Measurements of Transuranium Nuclides at TRIGA-TRAP

机译：使用TRIGA-TRAP上的超铀核素的高精度Penning-Trap质量测量方法绘制N = 152变形的壳盖

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摘要

Superheavy elements with Z ≥ 104 owe their existence to shell effects, which stabilize their nuclei against immediate spontaneous fission caused by the large number of protons. These effects, without which such elements would not exist, lead to enhanced nuclear binding. Direct access to the binding energy can be obtained through high precision mass measurements, exploiting Einstein's relation between (nuclear) mass and (nuclear binding) energy. High-precision mass measurements with single ions can be performed with Penning-trap mass spectrometers. TRIGA-TRAP is such an experiment, installed at the research reactor TRIGA Mainz. It is optimized for measurements of neutron-rich nuclides produced by neutron-induced fission of ~(235)U or ~(249)Cf inside the reactor, and also of long-lived transuranium isotopes, thus reaching into the realm of the heaviest elements, where direct experimental values are rare because of the low availability of the isotopes of interest. The latest mass measurements of transuranium nuclides (e.g. Pu-244, Am-241/243, Cf-249) will be presented. Microgram amounts of the isotopes of interest were deposited on suitable substrates. The ions for the measurements were produced by a non-resonant laser ion source combined with a new miniature radio-frequency quadrupole device. The performed measurements, near the deformed shell closure at N=152, provide benchmark data for testing nuclear models used to predict properties of superheavy elements and provide anchor points of a-decay chains, which are used to identify SHE isotopes produced in heavy ion fusion reactions.
机译：Z≥104的超重元素归因于壳层效应，使它们的核稳定，以防止大量质子引起的立即自发裂变。没有这些元素将不存在的这些影响导致增强的核结合。利用爱因斯坦（核）质量与（核结合）能之间的关系，可以通过高精度质量测量直接获得结合能。可以使用Penning-trap质谱仪执行单离子的高精度质量测量。 TRIGA-TRAP是这样的实验，安装在研究堆TRIGA Mainz上。它被优化用于测量由中子诱发的反应堆内部〜（235）U或〜（249）Cf裂变产生的富中子核素，以及长寿命的超铀同位素，从而进入最重元素的境界，因为感兴趣的同位素的可用性较低，因此无法获得直接的实验值。将介绍最新的铀核素质量测量方法（例如Pu-244，Am-241 / 243，Cf-249）。将微克量的感兴趣的同位素沉积在合适的基质上。用于测量的离子是由非共振激光离子源与新型微型射频四极杆设备组合产生的。所执行的测量在N = 152处变形的壳闭合附近，为测试用于预测超重元素性质的核模型提供了基准数据，并提供了a衰变链的锚定点，用于识别在重离子聚变中产生的SHE同位素反应。

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  • 来源
  • 会议地点 Chicago IL(US)
  • 作者

    D. Renisch; T.Beyer; K. Blaum; M. Block; Ch. E. Duellmann; K. Eberhardt; M. Eibach; J.Grund; Sz. Nagy; W. Noertershaeuser; F. Schneider;

  • 作者单位

    Institut fuer Kernchemie, JGU Mainz: Fritz Strassmann Weg 2, 55128 Mainz, Germany;

    Max-Planck-Institut fuer Kernphysik: Saupfercheck Weg 1, 69117 Heidelberg, Germany;

    Max-Planck-Institut fuer Kernphysik: Saupfercheck Weg 1, 69117 Heidelberg, Germany;

    GSI Helmholtzzentrum fuer Schwerionenforschung: Planckstrasse 1, 64291 Darmstadt, Germany;

    Institut fuer Kernchemie, JGU Mainz: Fritz Strassmann Weg 2, 55128 Mainz, Germany ,GSI Helmholtzzentrum fuer Schwerionenforschung: Planckstrasse 1, 64291 Darmstadt, Germany ,Helmholtz-Institut Mainz: 55099 Mainz, Germany;

    Institut fuer Kernchemie, JGU Mainz: Fritz Strassmann Weg 2, 55128 Mainz, Germany ,Helmholtz-Institut Mainz: 55099 Mainz, Germany;

    Max-Planck-Institut fuer Kernphysik: Saupfercheck Weg 1, 69117 Heidelberg, Germany;

    Institut fuer Kernchemie, JGU Mainz: Fritz Strassmann Weg 2, 55128 Mainz, Germany;

    Max-Planck-Institut fuer Kernphysik: Saupfercheck Weg 1, 69117 Heidelberg, Germany;

    GSI Helmholtzzentrum fuer Schwerionenforschung: Planckstrasse 1, 64291 Darmstadt, Germany ,Technische Universitaet Darmstadt: Schlossgartenstrasse 2, 64289 Darmstadt, Germany;

    Institut fuer Kernchemie, JGU Mainz: Fritz Strassmann Weg 2, 55128 Mainz, Germany ,Institut fuer Physik, JGU Mainz: Staudingerweg 7, 55128 Mainz, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Penning-trap mass spectrometry; transuranium isotopes; superheavy element (SHE) research; neutron shell closure;

    机译：潘宁阱质谱超铀同位素超重元素（SHE）研究；中子壳封闭;

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