%0 Journal Article
%T Observation of mutually enhanced collectivity in self-conjugate $^{76}_{38}$Sr$_{38}$
%A A. Lemasson
%A H. Iwasaki
%A C. Morse
%A D. Bazin
%A T. Baugher
%A J. S. Berryman
%A A. Dewald
%A C. Fransen
%A A. Gade
%A S. McDaniel
%A A. Nichols
%A A. Ratkiewicz
%A S. Stroberg
%A P. Voss
%A R. Wadsworth
%A D. Weisshaar
%A K. Wimmer
%A R. Winkler
%J Physics
%D 2012
%I arXiv
%R 10.1103/PhysRevC.85.041303
%X The lifetimes of the first 2$^{+}$ states in the neutron-deficient $^{76,78}$Sr isotopes were measured using a unique combination of the $\gamma$-ray line-shape method and two-step nucleon exchange reactions at intermediate energies. The transition rates for the 2$^{+}$ states were determined to be $B$(E2;2$^{+}$$\to 0^{+}$) = 2220(270) e$^{2}$fm$^{4}$ for $^{76}$Sr and 1800(250) e$^{2}$fm$^{4}$ for $^{78}$Sr, corresponding to large deformation of $\beta_2$ = 0.45(3) for $^{76}$Sr and 0.40(3) for $^{78}$Sr. The present data provide experimental evidence for mutually enhanced collectivity that occurs at $N$ = $Z$ = 38. The systematic behavior of the excitation energies and $B$(E2) values indicates a signature of shape coexistence in $^{76}$Sr, characterizing $^{76}$Sr as one of most deformed nuclei with an unusually reduced $E$(4$^{+}$)/$E$(2$^{+}$) ratio.
%U http://arxiv.org/abs/1204.2279v1