Ruotsalainen, P, Henderson, J, Hackman, G, Sargsyan, GH, Launey, KD, Saxena, A, Srivastava, PC, Stroberg, SR, Grahn, T, Pakarinen, J et al (show 30 more authors)
(2019)
Isospin symmetry in <i>B</i>(<i>E</i>2) values: Coulomb excitation study of <SUP>21</SUP>Mg.
PHYSICAL REVIEW C, 99 (5).
051301-.
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Abstract
The $T_z$~=~$-\frac{3}{2}$ nucleus ${}^{21}$Mg has been studied by Coulomb excitation on ${}^{196}$Pt and ${}^{110}$Pd targets. A 205.6(1)-keV $\gamma$-ray transition resulting from the Coulomb excitation of the $\frac{5}{2}^+$ ground state to the first excited $\frac{1}{2}^+$ state in ${}^{21}$Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the $\frac{1}{2}^+$ state yield an adopted value of $B(E2;\frac{5}{2}^+\rightarrow\frac{1}{2}^+)$~=~13.3(4)~W.u. A new excited state at 1672(1)~keV with tentative $\frac{9}{2}^+$ assignment was also identified in ${}^{21}$Mg. This work demonstrates large difference of the $B(E2;\frac{5}{2}^+\rightarrow\frac{1}{2}^+)$ values between $T$~=~$\frac{3}{2}$, $A$~=~21 mirror nuclei. The difference is investigated in the shell-model framework employing both isospin conserving and breaking USD interactions and using modern \textsl{ab initio} nuclear structure calculations, which have recently become applicable in the $sd$ shell.
| Item Type: | Article |
|---|---|
| Additional Information: | 8 pages, 6 figures, submitted to Phys. Rev. C, Rapid Communication |
| Uncontrolled Keywords: | nucl-ex, nucl-ex |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 16 Jan 2020 08:42 |
| Last Modified: | 17 Mar 2024 01:17 |
| DOI: | 10.1103/PhysRevC.99.051301 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3070732 |
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