Nuclear structure studies of172Yb

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Abstract
A study has been made of excited states in 172Yb populated in the 170Er( alpha ,2n)172Yb reaction using a bombarding energy of 19 MeV. The experimental information has been derived from gamma-ray singles, coincidence, angular distribution and conversion electron singles measurements. A Coulomb excitation experiment using alphas at projectile energies of 12 and 14 MeV produced measurements of six B(E2)'s and three B(E3)'s to excited 2+ and 3- states respectively. The properties of 172Yb have been examined with particular attention being paid to departures from adiabatic rotational behaviour of the excited Kpi =0+ band at 1043 keV and the Kpi =1- octupole band at 1155 keV. M1 admixtures to the Delta I=0 transitions between the band at 1043 keV and the ground-state band have been examined in an attempt to determine their source. E0 strengths have also been measured for these transitions.