Constraining the in-medium nucleon-nucleon cross section from the width of nuclear giant dipole resonance

Constraining the in-medium nucleon-nucleon cross section from the width of nuclear giant dipole resonance
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从核巨偶极子共振宽度约束介质内核子-核子横截面

DOI:
10.1016/j.physletb.2020.135532
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发表时间:
2020-06
期刊:
影响因子:
4.4
通讯作者:
Ma Yu-Gang
Ma Yu-Gang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wang Rui;Zhang Zhen;Chen Lie-Wen;Ko Che Ming;Ma Yu-Gang

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我们开发了一种新的格子哈密顿方法来求解 Boltzmann-Uehling-Uhlenbeck (BUU) 方程。采用随机方法处理碰撞项,并使用GPU并行计算进行计算,可以使碰撞项尤其是泡利块的计算精度达到相当高的水平,从而将BUU方程的求解精度提高到一个新的水平。应用这种晶格BUU方法来研究原子核中巨偶极共振(GDR)的宽度,其中碰撞项的精确处理至关重要,我们发现所获得的208 Pb的GDR宽度表现出对介质内核子-核子截面σ NN⁎的强烈依赖性。在日本大阪核物理研究中心重现 208 Pb GDR 宽度的测量值需要非常大的介质衰减 σ NN⁎。
We develop a new lattice Hamiltonian method for solving the Boltzmann-Uehling-Uhlenbeck (BUU) equation. Adopting the stochastic approach to treat the collision term and using the GPU parallel computing to carry out the calculations allows for a rather high accuracy in evaluating the collision term, especially its Pauli blocking, leading thus to a new level of precision in solving the BUU equation. Applying this lattice BUU method to study the width of giant dipole resonance (GDR) in nuclei, where the accurate treatment of the collision term is crucial, we find that the obtained GDR width of 208 Pb shows a strong dependence on the in-medium nucleon-nucleon cross section σ NN⁎. A very large medium reduction of σ NN⁎ is needed to reproduce the measured value of the GDR width of 208 Pb at the Research Center for Nuclear Physics in Osaka, Japan.
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