Speaker
Prof.
Hui Hua
(Peking University)
Description
The β-delayed γ-ray spectroscopy of neutron-rich 123,125Ag isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN, and the long-predicted 1/2− β-emitting isomers in 123,125Ag are identified for the first time[1]. With the new experimental results, the systematic trend of energy spacing between the lowest 9/2+ and 1/2− levels is extended in Ag isotopes up to N = 78, providing a clear signal for the reduction of the Z = 40 subshell gap in Ag towards N = 82. To study the β-delayed neutron decay of nuclei far from β stability line, a new beta-delayed neutron detection system working with the continuous beam mode has been built at Peking University and tested with radioactive ion beams[2]. This detection system has been applied to study the β-delayed neutron decay of nuclei around the ‘island of inversion'.
To explore the spectroscopy of 18Mg by its four-proton decay to 14O, an experiment was performed at NSCL. The goal of the experiment was to study the energy level and the internal proton correlations of 18Mg, which is further beyond the proton-drip line than the previously well-known two-proton radioactive nucleus 19Mg. The secondary beam of 20Mg was produced by fragmenting 24Mg from the CCF on a 9Be target and purified in the A1900 fragment separator. 18Mg was produced by a two-neutron knockout reaction on another 9Be target in the S800 target chamber. Protons were detected by a silicon (S4) and cesium iodide (CsI) array, and the 14O residues were analyzed by a newly made scintillator fiber array and the S800 spectrometer.
Ref.
[1]Z.Q. Chen, Z.H. Li, H. Hua, H. Watanabe, C.X. Yuan et al., Physical Review Letters 122, 212502 (2019);
[2]C.G. Wang, X.Q. Li, R. Han, Z.H. Li a, H. Hua et al., Nuclear Inst. and Methods in Physics Research, A940, 83–87(2019)
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Primary author
Prof.
Hui Hua
(Peking University)
Co-author
Dr
Zhihuan Li
(Peking University)
