Stagnancy of the pygmy dipole resonance

  • The pygmy dipole resonance (PDR) of nickel isotopes is studied using the deformed random phase approximation method. The isoscalar character of the pygmy resonance is confirmed, and the correlation between the pygmy resonance and neutron skin thickness is discussed. Our investigation shows a linear correlation between PDR integral cross section and neutron skin thickness when the excess neutrons lie in pf orbits, with a correlation rate of about 0.27 fm-1. However, in more neutron-rich nickel isotopes, the growth of the pygmy dipole resonance is stagnant. Although the neutron skin thickness increases, the whole skin is not active. There is an inertial part in the nuclei 70-78Ni which does not participate in the pygmy resonance actively and as a result, contributes little to the photo-absorption cross section.
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Xu-Wei Sun, Jing Chen and Ding-Hui Lu. Stagnancy of the pygmy dipole resonance[J]. Chinese Physics C, 2018, 42(1): 014101. doi: 10.1088/1674-1137/42/1/014101
Xu-Wei Sun, Jing Chen and Ding-Hui Lu. Stagnancy of the pygmy dipole resonance[J]. Chinese Physics C, 2018, 42(1): 014101.  doi: 10.1088/1674-1137/42/1/014101 shu
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Received: 2017-06-23
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Stagnancy of the pygmy dipole resonance

    Corresponding author: Xu-Wei Sun,
  • 1. Department of Physics, Zhejiang University, Hangzhou 310027, China
Fund Project:  Supported by National Science Foundation of China

Abstract: The pygmy dipole resonance (PDR) of nickel isotopes is studied using the deformed random phase approximation method. The isoscalar character of the pygmy resonance is confirmed, and the correlation between the pygmy resonance and neutron skin thickness is discussed. Our investigation shows a linear correlation between PDR integral cross section and neutron skin thickness when the excess neutrons lie in pf orbits, with a correlation rate of about 0.27 fm-1. However, in more neutron-rich nickel isotopes, the growth of the pygmy dipole resonance is stagnant. Although the neutron skin thickness increases, the whole skin is not active. There is an inertial part in the nuclei 70-78Ni which does not participate in the pygmy resonance actively and as a result, contributes little to the photo-absorption cross section.

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