期刊
PHYSICAL REVIEW LETTERS
卷 126, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.252501
关键词
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资金
- RIKEN Special Postdoctoral Researcher Program
- IPA program at the RIKEN Nishina Center
- Japan Society for the Promotion of Science [JP16K05352]
- JSPS KAKENHI [JP16H02179, JP18H05404]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [BL 1513/1-1, 279384907-SFB 1245]
- GSI-TU Darmstadt cooperation agreement
- BMBF [05P19RDFN1]
- Swedish Research Council [621-2014-5558, 201904880]
- Vietnam MOST via the Physics Development Program [DTDLCN.25/18]
- European Regional Development Fund [GINOP-2.3.3-15-2016-00034]
- National Research, Development and Innovation Fund of Hungary [K128947]
- IBS - Korea government [IBS-R031-D1]
The study investigated direct proton-knockout reactions of Sc-55, populated states of Ca-54, calculated level energies and theoretical cross sections, and found that despite excited neutron configurations in the ground state of Sc-55, valence proton removals predominantly populated the ground state of Ca-54. This counterintuitive result is attributed to pairing effects leading to a dominance of the ground-state spectroscopic factor, which could be generally applicable to direct knockout reactions from odd-even to even-even nuclei.
Direct proton-knockout reactions of Sc-55 at similar to 220 MeV/nucleon were studied at the RIKEN Radioactive Isotope Beam Factory. Populated states of Ca-54 were investigated through -ray and invariant-mass spectroscopy. Level energies were calculated from the nuclear shell model employing a phenomenological intemucleon interaction. Theoretical cross sections to states were calculated from distorted-wave impulse approximation estimates multiplied by the shell model spectroscopic factors, which describe the wave function overlap of the Sc-55 ground state with states in Ca-54. Despite the calculations showing a significant amplitude of excited neutron configurations in the ground-state of Sc-55, valence proton removals populated predominantly the ground state of Ca-54. This counterintuitive result is attributed to pairing effects leading to a dominance of the ground-state spectroscopic factor. Owing to the ubiquity of the pairing interaction, this argument should be generally applicable to direct knockout reactions from odd-even to even-even nuclei.
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