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Level densities of Ge-74,Ge-76 from compound nuclear reactions

机译:GE-74,GE-76的水平密度来自复合核反应

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摘要

The level densities of Ge-74,Ge-76 nuclei are studied with Zn-68,Zn-70(Li-7, Xp) reactions. Proton evaporation spectra are measured at backward angles in a wide energy region, from about 2 to 25 MeV. The analysis of spectra allows for the testing of level density models used in modern reaction codes for practical cross-section calculations. Our results show that at excitation energies above the discrete level region, all level density models tested in this work overestimate the level densities that are needed to reproduce proton spectra from these reactions. The Gilbert and Cameron model, which includes the constant-temperature energy dependence of the level density, shows the best agreement with experiment, however, its parameters need to be adjusted to reflect the observed reduction of the level density at higher excitation energies.
机译:用Zn-68,Zn-70(Li-7,XP)反应研究了GE-74,GE-76核的水平密度。 质子蒸发光谱在宽能量区域的落后角度,约2至25meV测量。 光谱分析允许测试现代反应码中使用的水平密度模型,以实现实际横截面计算。 我们的研究结果表明,在离散级别区域上方的励磁能量时,在该工作中测试的所有水平密度模型高估了从这些反应再现质子光谱所需的水平密度。 包括水平密度恒温能量依赖性的吉尔伯特和卡梅隆模型表明了与实验的最佳协议,然而,需要调整其参数以反映在更高的激发能中观察到的降低水平密度。

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  • 来源
    《Physical review, C》 |2019年第5期|共11页
  • 作者单位

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

    Univ Oslo Dept Phys N-0316 Oslo Norway;

    Lawrence Livermore Natl Lab 7000 East Ave Livermore CA 94551 USA;

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

    Univ Oslo Dept Phys N-0316 Oslo Norway;

    Univ Oslo Dept Phys N-0316 Oslo Norway;

    Michigan State Univ Dept Chem E Lansing MI 48824 USA;

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

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

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

    Cent Michigan Univ Dept Phys Mt Pleasant MI 48859 USA;

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

    Cent Michigan Univ Dept Phys Mt Pleasant MI 48859 USA;

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

    Ohio Univ Dept Phys &

    Astron Athens OH 45701 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
  • 关键词

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