Journal
PHYSICAL REVIEW C
Volume 98, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.98.014315
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Funding
- Key Research Program of Frontier Sciences of CAS [QYZDJ-SSW-S]
- National Key R&D Program of China [2016YFA0400504, 2018YFA0404400]
- Helmholtz-CAS Joint Research Group [HCJRG-108]
- European Research Council (ERC) under the European Union's Horizon 2020 Research and Innovation Programme [682841]
- Chinese Academy of Sciences through the CAS visiting professorship [2009J2-23]
- CAS External Cooperation Program [GJHZ1305]
- Nuclear Astrophysics Virtual Institute (NAVI) of the Helmholtz Association
- Ministry of Science and Technology of China (Talented Young Scientist Program)
- China Postdoctoral Science Foundation [2014M562481]
- CAS Light of West China Program
- ExtreMe Matter Institute EMMI at the GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt, Germany
- Max Planck Society through the Max-Planck Partner Group
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Isochronous mass spectrometry has been applied in the storage ring CSRe to measure the masses of the T-z = -3/2 nuclei P-27 and S-29. The new mass excess value ME(S-29) = -3094(13) keV is 66(52) keV larger than the result of the previous S-32(He-3, He-6)S-29 reaction measurement in 1973 and a factor of 3.8 more precise. The new result for S-29 together with those of the T = 3/2 isobaric analog states in P-29, Si-29, and Al-29 fit well into the quadratic form of the isobaric multiplet mass equation (IMME). The mass excess of P-27 has been remeasured to be ME(P-27) = -685(42) keV. By analyzing the linear and quadratic coefficients of the IMME in the T-z = -3/2 sd-shell nuclei, it was found that the ratio of the Coulomb radius parameters is R approximate to 0.96 and is nearly the same for all T-z = 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.
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