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首页> 外文期刊>Physical review letters >Neutron Single Particle Structure in ~(131)Sn and Direct Neutron Capture Cross Sections
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Neutron Single Particle Structure in ~(131)Sn and Direct Neutron Capture Cross Sections

机译：〜（131）Sn和直接中子俘获截面中的中子单粒子结构

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摘要

Recent calculations suggest that the rate of neutron capture by ~(130)Sn has a significant impact on late-time nucleosynthesis in the r process. Direct capture into low-lying bound states is expected to be significant in neutron capture near the N = 82 closed shell, so r-process reaction rates may be strongly impacted by the properties of neutron single particle states in this region. In order to investigate these properties, the (d,p) reaction has been studied in inverse kinematics using a 630 MeV beam of ~(130)Sn (4.8 MeV/u) and a (CD_2)_n target. An array of Si strip detectors, including the Silicon Detector Array and an early implementation of the Oak Ridge Rutgers University Barrel Array, was used to detect reaction products. Results for the ~(130)Sn(d,p)~(131)Sn reaction are found to be very similar to those from the previously reported ~(132)Sn(d,p)~(133)Sn reaction. Direct-semidirect (n, γ) cross section calculations, based for the first time on experimental data, are presented. The uncertainties in these cross sections are thus reduced by orders of magnitude from previous estimates.
机译：最近的计算表明，〜（130）Sn捕获中子的速率对r过程中的后期核合成有重大影响。在N = 82密闭壳附近的中子捕获中，直接捕获到低位束缚态被认为是重要的，因此r-反应的反应速率可能会受到该区域中子单粒子态性质的强烈影响。为了研究这些性质，已经使用〜（130）Sn（4.8 MeV / u）的630 MeV光束和（CD_2）_n靶在逆运动学中研究了（d，p）反应。一系列的硅带检测器，包括硅检测器阵列和橡树岭罗格斯大学桶式阵列的早期实现，被用于检测反应产物。发现〜（130）Sn（d，p）〜（131）Sn反应的结果与先前报道的〜（132）Sn（d，p）〜（133）Sn反应的结果非常相似。首次提出了基于实验数据的直接-半直接（n，γ）截面计算。因此，这些横截面中的不确定性比以前的估计值降低了几个数量级。

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  • 来源
    《Physical review letters》 |2012年第17期|172501.1-172501.5|共5页
  • 作者

    R. L. Kozub; G. Arbanas; A. S. Adekola; D. W. Bardayan; J. C. Blackmon; K. Y. Chae; K. A. Chipps; J. A. Cizewski; L. Erikson; R. Hatarik; W.R. Hix; K.L. Jones; W. Krolas; J.F. Liang; Z. Ma; C. Matei; B.H. Moazen; C.D. Nesaraja; S.D. Pain; D. Shapira; J.F. Shriner Jr; M.S. Smith; T.P. Swan;

  • 作者单位

    Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505, USA;

    Reactor and Nuclear Systems Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6171, USA;

    Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA,Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA;

    Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA,Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA.;

    Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA,Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea;

    Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA;

    Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA;

    Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA,Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA.;

    Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA,Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.;

    Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA,Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Institute of Nuclear Physics, PAN, 31-342 Krakow, Poland;

    Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Oak Ridge Associated Universities, Building 6008, P.O. Box 2008, Oak Ridge, Tennessee 37831-6374, USA,European Commission-Joint Research Centre, Institute for Reference Materials and Measurements, Retieseweg 111 2440 GEEL, Belgium.;

    Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA,Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505, USA;

    Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA,Department of Physics, University of Surrey, Guilford, Surrey, GU2 7XH, United Kingdom;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    spectroscopic factors; transfer reactions; transfer reactions;

    机译：光谱因素转移反应;转移反应;

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