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Physical Review Letters 105 (2010) 102501
Prolate-Spherical Shape Coexistence at N=28 in $^{44}$S
C. Force1, S. Grévy1, L. Gaudefroy2, O. Sorlin1, L. Caceres1, F. Rotaru3, J. Mrazek4, N.L. Achouri5, J.C. Angélique5, F. Azaiez6, B. Bastin5, R. Borcea3, A. Buta3, J.M. Daugas2, Z. Dlouhy4, Zs. Dombradi7, F. de Oliveira1, F. Negoita3, Y. Penionzhkevich8, M.G. Saint-Laurent1, D. Sohler7, M. Stanoiu3, I. Stefan6, C. Stodel1, F. Nowacki9

The structure of $^{44}$S has been studied using delayed $\gamma$ and electron spectroscopy at \textsc{ganil}. The decay rates of the 0$^+_2$ isomeric state to the 2$^+_1$ and 0$^+_1$ states have been measured for the first time, leading to a reduced transition probability B(E2~:~2$^{+}_1$$\rightarrow$0$^{+}_2)$= 8.4(26)~e$^2$fm$^4$ and a monopole strength $\rho^2$(E0~:~0$^{+}_2$$\rightarrow$0$^{+}_1)$ =~8.7(7)$\times$10$^{-3}$. Comparisons to shell model calculations point towards prolate-spherical shape coexistence and a phenomenological two level mixing model is used to extract a weak mixing between the two configurations.
1 :  GANIL - Grand Accélérateur National d'Ions Lourds
2 :  DAM/DIF - DAM Île-de-France
3 :  NIPNE - Horia Hulubei National Institute of Physics and Nuclear Engineering
4 :  Nuclear Physics Institute, ASCR Rez
5 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
6 :  IPNO - Institut de Physique Nucléaire d'Orsay
7 :  ATOMKI - Institute of Nuclear Research of the Hungarian Academy of Sciences
9 :  IPHC - Institut Pluridisciplinaire Hubert Curien
Structure nucléaire
Physique/Physique Nucléaire Expérimentale
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