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Fig.1 Partial energy level diagram of 84Sr
Figure 2 84Sr positive parity TRS
Recently, scientists from the Nuclear Energy Safety Research Institute of the Chinese Academy of Sciences' Institute of Atomic Energy Research and the China Atomic Energy Research Institute have cooperated with the beam γ spectrometry team to utilize the heavy ion fusion evaporation reaction mechanism and gamma ray detector array to achieve high spin state of the spherical 84Sr core. The energy level structure has been experimentally studied and theoretically analyzed, and new progress has been made. The results were published in the new issue of the “Science Report†of the “Nature†Publishing Group.
Theoretically, it has been predicted that neutron nuclides 76, 78Sr are deformation nuclei and their ß2 = 0.421; and for 88Sr, where the number of sons is N = 50 and the number of protons is Z = 38, they belong to the double illusion nucleus and should be spherical nuclei. The 84Sr has four neutron cavities compared to the double psychedelic 88Sr and should have both collective and quasi-particle excitation.
The 18O beam provided by the tandem electrostatic accelerator was used by the Institute of Atomic Energy in the beam γ spectroscopy group. The high spin state of the stable 84Sr was posed by the heavy-ion fused evaporation reaction 70Zn(18O, 4n)84Sr, and a new energy level of 84Sr was established. Outline diagram (see Figure 1). The experimental observation of the positive and negative reverberation zone 14+ above shows the phenomenon of rotational symmetry, indicating that the nuclei are no longer maintaining the near-spherical shape in the low-spin state.
He Shenhui, a researcher at the Institute of Nuclear Safety of the Hefei Research Institute, studied the deformation of the 84Sr (see Figure 2) by calculating the total rotational energy surface TRS of the Zhengyu belt under the framework of a pairing-deformation-rotating frequency self-consistent pushing shell model. At a low rotational frequency, the core is a nearly spherical nucleus. As the rotational frequency increases, the nucleus hardens slightly. When the rotational frequency ћw=0.6 MeV, a deformation occurs minimally, and the deformation is extremely small at ћw=0.7 MeV. At minimum, and maintain high rotational frequency. This is a test for investigating the energy level structure of this kind of core with a projection shell model. Recently, a triaxial projection shell model has also been used to consider the work of such cores. The energy level of the negative parity band is in good agreement with the previous one's deformation configuration hybrid shell model (DCM). An abrupt increase in the ratio of B(M1)/B(E2) above 11-state may be attributed to neutron holes occupying the high-Ω orbit of g9/2.
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