期刊
PHYSICAL REVIEW C
卷 99, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.99.051301
关键词
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资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation
- British Columbia Knowledge Development Fund
- National Research Council of Canada
- Academy of Finland under the Finnish Center of Excellence Programme (2012-2017)
- U.S. Department of Energy [DE-SC0017649]
- U.S. National Science Foundation [OIA-1738287, ACI-1713690]
- NSF [OCI-0725070, ACI-1238993]
- State of Illinois
- [DE-AC52-07NA27344]
- U.S. Department of Energy (DOE) [DE-SC0017649] Funding Source: U.S. Department of Energy (DOE)
The T-z = -3/2 nucleus Mg-21 has been studied by Coulomb excitation on Pt-196 and Pd-110 targets. A 205.6(1)-keV gamma-ray transition resulting from the Coulomb excitation of the 5/2(+) ground state to the first excited 1/2(+) state in Mg-21 was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the 1/2(+) state yield an adopted value of B(E2; 5/2(+) -> 1/2(+)) = 13.3(4) W.u. A new excited state at 1672(1) keV with tentative 9/2(+) assignment was also identified in Mg-21. This work demonstrates a large difference in the B(E2; 5/2(+) -> 1/2(+)) value between T = 3/2, A = 21 mirror nuclei. The difference is investigated in the shell-model framework employing both isospin conserving and breaking USD interactions and using modern ab initio nuclear structure calculations, which have recently become applicable in the sd shell.
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