期刊
PHYSICAL REVIEW LETTERS
卷 127, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.182503
关键词
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资金
- National Science Foundation [PHY-14-30152, PHY-15-65546, PHY-18-11855, PHY-21-10365, PHY-21-11185]
- U.S. Department of Energy Office of Science, Office of Nuclear Physics [DE-FG02-92ER40750]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [279384907-SFB 1245]
The nuclear charge radius of Ni-54 was determined using collinear laser spectroscopy, with the difference in charge radii compared to Fe-54 and the symmetry energy at nuclear saturation density yielding new insights into nuclear properties.
The nuclear root-mean-square charge radius of Ni-54 was determined with collinear laser spectroscopy to be R(Ni-54) =3.737 (3) fm. In conjunction with the known radius of the mirror nucleus Fe-54, the difference of the charge radii was extracted as Delta R-ch = 0.049 (4) fm. Based on the correlation between Delta R-ch and the slope of the symmetry energy at nuclear saturation density (L), we deduced 21 = L = 88 MeV. The present result is consistent with the L from the binary neutron star merger GW170817, favoring a soft neutron matter EOS, and barely consistent with the PREX-2 result within 1 sigma error bands. Our result indicates the neutron-skin thickness of Ca-48 as 0.15-0.21 fm.
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