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Masses of the Tz = −3/2 nuclei 27P and 29S

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Blaum,  K.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

Chen,  X. C.
Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China;
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Tu,  X. L.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China;
Joint Research Center for Modern Physics and Clean Energy, South China Normal University, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China;

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Citation

Fu, C. Y., Zhang, Y. H., Zhou, X. H., Wang, M., Litvinov, Y. A., Blaum, K., et al. (2018). Masses of the Tz = −3/2 nuclei 27P and 29S. Physical Review C, 98(1): 014315. doi:10.1103/PhysRevC.98.014315.


Cite as: https://hdl.handle.net/21.11116/0000-0001-B526-8
Abstract
Isochronous mass spectrometry has been applied in the storage ring CSRe to measure the masses of the Tz=−3/2 nuclei 27 P and 29 S. The new mass excess value ME( 29 S)=−3094(13)keV is 66(52) keV larger than the result of the previous 32 S( 3 He, 6 He) 29 S reaction measurement in 1973 and a factor of 3.8 more precise. The new result for 29 S together with those of the T=3/2 isobaric analog states in 29 P, 29 Si, and 29 Al fit well into the quadratic form of the isobaric multiplet mass equation (IMME). The mass excess of 27 P has been remeasured to be ME( 27 P)=−685(42)keV. By analyzing the linear and quadratic coefficients of the IMME in the Tz =−3/2 sd-shell nuclei, it was found that the ratio of the Coulomb radius parameters is R≈0.96 and is nearly the same for all T=3/2 isospin multiplets. Such a nearly constant R value, apparently valid for the entire light mass region with A>9, can be used to set stringent constraints on the isovector and isotensor components of the isospin nonconserving forces in theoretical calculations.