Study of spontaneous fission with EUROGAM - Shape transition in A similar to 100 Sr and Zr nuclei

Prompt gamma radiation following spontaneous fission has been measured using the EUROGAM 2 array. Using these data and newly developed analysis techniques a number of subjects were studied, which are briefly discussed. One of these subjects, shape transition in A approximate to 100 Sr and Zr nuclei is discussed in more detail. Quadrupole moments were determined, for rotational bands in the N=58,59,60,62 and 64 Sr and Zr isotopes. Deformation parameters, which increase from beta(2) approximate to 0.1 at N=56 to beta(2) approximate to 0.4 at N=64, suggest that in strontium and zirconium isotopes shape change happens gradually between N=56 and N=62 and is probably due to an occupancy of three or more deformation-driving orbitals of h(11/2) parentage.

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