Spectroscopic studies of near stable cadmium and indium nuclei
A fusion-evaporation reaction between a thick self-supporting 110Pd target
and a 'Li beam has been used to populate and study indium and cadmium
nuclei with A=112-114 using the YRAST Ball -y-ray spectrometer array. Previously
unreported states in 112In and 114In have been observed by use of -y--y and
'y3 coincidences, and tentative spin and parity assignments using -y-ray angular
correlation and distribution analysis have identified several bands consisting of
stretched dipole transitions. Experimental B(M1)/B(E2) values extracted from
these dipole bands are consistent with values indicative of a shears mechanism.
The experimental B(M1)/B(E2) values have been compared with theoretical values
calculated using the semi-classical Dönau formalism and are consistent with a
single 99/2 proton coupled to various rotationally aligned neutron configurations.
Calculations of Z(2)/B(E2) result in values in excess of those usually obtained
from rotational bands based on collective rotation and further add to the evidence
of angular momentum generation by the shears mechanism. Two previously unreported
states in 112C d have been observed which allow the observation of the
vibrational to rotational evolution by use of E-GOS curves.
The commissioning of SASSYER, a recoil separator situated at the Wright
Nuclear Structure Laboratory, Yale University, is documented in Appendix A.
The use of an array of solar cells as a recoil detector is reported and the initial
performance of SASSYER is investigated.