Mutually enhanced collectivity in self-conjugate 76Sr
A. Lemasson (NSCL, Michigan State University)
11h GANIL seminar room (105)
a coffee will be served 15mn before
The shape of the atomic nucleus is determined by the interplay of macroscopic and mi-
croscopic e ects within this nite quantum many-body system. Self-conjugate nuclei give an
opportunity to study the role of neutron proton correlations in deformation and have attracted
a great interest due to drastic shape evolution along the N = Z line. In these nuclei, pro-
ton and neutron shell e ects can act coherently, promoting an extreme sensitivity of nuclear
properties to small changes of nucleon numbers. Strong ground-state deformation is expected
to occur for N = Z nuclei above Z = 36 from the 2+ energy systematic as well as from
theoretical predictions and reduced transition strengths B(E2) can guide our understanding
of the onset of collectivity along the N = Z line.
In this talk, I will report on the rst determination of B(E2; 2+ -> 0+) for the N = Z = 38
nucleus 76Sr obtained from the measurement of the 2+ state lifetime using
rays line shape technique. 76Sr nuclei were produced at the NSCL in charge exchange reaction from fast
secondary 76Rb beam. g-rays emitted at the reaction target position were measured with the
SeGA HPGe array in coincidence with reaction residues detected in the S800 spectrometer.
Results will be discussed in the light of available data and theoretical predictions to provide
insight into the evolution of shell structure and collectivity in this region.
