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Role of exact treatment of thermal pairing in radiative strength functions of Dy161-163 nuclei

机译:DY161-163核辐射强度函数热配对精确处理的作用

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摘要

The enhancement of radiative strength function (RSF) in the region of low gamma-rays energy (E gamma <= 12 MeV), which is caused by the pygmy dipole resonance (PDR), is treated within the phonon damping model (PDM) plus exact thermal pairing (EP) without adding any extra PDR strength function. The numerical calculations performed for Dy161-163 show that, because of the effect of EP, the EP+PDM can describe reasonably well the total RSF data in both low- and high-energy regions of gamma rays. Consequently, as compared to the conventional description within the phenomenological generalized Lorentzian and standard Lorentzian models, the EP+PDM calculations can eliminate, at least, eight free parameters. This indicates the important role of microscopic approaches towards the precise description of the RSF. In particular, temperature is found to have significant contributions to the RSF below the neutron separation energy, questioning again the validity of the Brink-Axel hypothesis in this energy region.
机译:由pygmy偶极子共振(PDR)引起的辐射强度函数(RSF)在低伽马射线能量(E伽马<=12 MeV)区域的增强,在声子阻尼模型(PDM)和精确热配对(EP)内处理,而不添加任何额外的PDR强度函数。对Dy161-163进行的数值计算表明,由于EP的影响,EP+PDM可以合理地描述伽马射线低能区和高能区的总RSF数据。因此,与唯象广义洛伦兹模型和标准洛伦兹模型中的常规描述相比,EP+PDM计算至少可以消除八个自由参数。这表明微观方法在精确描述RSF方面的重要作用。特别是,温度对中子分离能以下的RSF有显著贡献,再次质疑了Brink-Axel假说在该能区的有效性。

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  • 来源
    《Physical review, C》 |2020年第6期|共6页
  • 作者单位

    Day Tan Univ Inst Fundamental &

    Appl Sci Ho Chi Minh City 700000 Vietnam;

    Day Tan Univ Inst Fundamental &

    Appl Sci Ho Chi Minh City 700000 Vietnam;

    RIKEN Nishina Ctr Accelerator Based Sci Quantum Hadron Phys Lab 2-1 Hirosawa Wako Saitama 3510198 Japan;

    Univ Khanh Hoa Dept Nat Sci &

    Technol Nha Trang City 652124 Khanh Hoa Provi Vietnam;

    Vietnam Atom Energy Inst Dalat Nucl Res Inst 01 Nguyen Tu Luc Dalat City 670000 Vietnam;

    Sungkyunkwan Univ Dept Phys Suwon 16419 South Korea;

    Univ Electrocommun Dept Engn Sci Chofu Tokyo 1828585 Japan;

    Hue Univ Univ Educ Fac Phys 34 Le Loi St Hue City 530000 Vietnam;

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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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