6533b7d6fe1ef96bd1265a70
RESEARCH PRODUCT
Isospin symmetry in B(E2) values: Coulomb excitation study of Mg21
M. HollM. HollS. R. StrobergN. BernierN. BernierPaul GreenleesTuomas GrahnCorina AndreoiuChing-yen WuJanne PakarinenL. J. EvittsL. J. EvittsM. Q. BucknerG. C. BallJoochun ParkJoochun ParkA. KurkjianG. HackmanJ. K. SmithAaron ChesterD. KisliukE. McgeeA. B. GarnsworthyPanu RuotsalainenS. CruzS. CruzR. FrederickG. H. SargsyanK. StarostaR. Caballero-folchArchana SaxenaD. MücherK. G. LeachJ. MeasuresJ. MeasuresP. C. SrivastavaD. SouthallM. WilliamsK. WhitmoreM. BowryJames SmallcombeRauno JulinF. SarazinKristina D. LauneyC. E. SvenssonJack Hendersonsubject
Physics010308 nuclear & particles physicsNuclear structureAb initioCoulomb excitation01 natural sciencesSymmetry (physics)Excited stateIsospin0103 physical sciencesMirror nucleiAtomic physics010306 general physicsGround statedescription
The Tz=−32 nucleus 21Mg has been studied by Coulomb excitation on 196Pt and 110Pd targets. A 205.6(1)-keV γ-ray transition resulting from the Coulomb excitation of the 52+ ground state to the first excited 12+ state in 21Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the 12+ state yield an adopted value of B(E2;52+→12+)=13.3(4) W.u. A new excited state at 1672(1) keV with tentative 92+ assignment was also identified in 21Mg. This work demonstrates a large difference in the B(E2;52+→12+) value between T=32, 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. (Less)
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-05-06 | Physical Review C |