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Low-energy proton-deuteron elastic scattering and the A(y) puzzle.

机译：低能质子-氘核弹性散射和A（y）难题。

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摘要

Angular distributions of cross sections and complete sets of analyzing powers have been measured for d-p scattering at a center-of-mass energy of 667 +/- 1 keV. This set of high-precision data was compared to the most recent variational calculations with the nucleon- nucleon potential AV18 alone and with AV18 plus the UR three-nucleon potential. The calculations have the best agreement with the cross-section data while the comparison with the tensor analyzing powers showed good agreement. However, a comparison between the vector analyzing powers revealed differences of approximately 40% in the maxima of the angular distributions. These NAP discrepancies have been observed at Ec.m. ≥ 2.0 MeV as well as in the n-d scattering case. After the n-d experiments, the problem has been labelled the " Ay Puzzle". A chi2/datum analysis was performed with the lowest values achieved by the inclusion of a three-nucleon force in the theoretical calculations. This fact provides more credence for the existence of three-nucleon forces. However, the chi2/datum for the VAPs remained approximately 100. To investigate the root of the problem in addition to other differences between the theory and the data, a single-energy phase shift analysis (PSA) was performed. The best fits to the NAP data displayed an ≈20% increase in the mixing parameter e32- and an increase in the splitting between 4 PJ phase shifts from the variational calculations with the AV18+UR potentials.
机译：在质量中心能量为667 +/- 1 keV的情况下，已针对d-p散射测量了横截面的角分布和整套分析能力。将这组高精度数据与最新的变分计算结果进行了比较，分别使用了单核素-核子电位AV18和AV18加UR的三核子电位。计算与横截面数据具有最佳一致性，而与张量分析能力的比较显示出良好的一致性。但是，矢量分析能力之间的比较表明，角度分布的最大值存在大约40％的差异。这些NAP差异已在Ec.m处观察到。 ≥2.0 MeV以及在n-d散射情况下。经过n-d次实验后，该问题被标记为“ Ay Puzzle”。通过在理论计算中包含三核子力实现的最低值执行chi2 / data分析。这一事实为三核子力的存在提供了更多的证据。但是，VAP的chi2 /数据仍然大约为100。除了理论和数据之间的其他差异之外，为了研究问题的根源，还执行了单能量相移分析（PSA）。对NAP数据的最佳拟合显示，混合参数e32-增加了20％左右，而从带有AV18 + UR电位的变分计算得出的4个PJ相移之间的分离增加了。

著录项

  • 作者

    Wood, Michael H.;

  • 作者单位

    The University of North Carolina at Chapel Hill.;

  • 授予单位 The University of North Carolina at Chapel Hill.;
  • 学科 Physics Nuclear.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 133 p.
  • 总页数 133
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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