Measurements of Isomeric Yield Ratios of (44m,g)Sc and (85m,g)Y with Intermediate Energy Bremsstrahlung

Abstract

We measured the energy dependent isomeric yield ratios for the Ti-nat(gamma,xn1p)Sc-44m,Sc-g and the Y-89(gamma,4n)Y-85m,Y-g reactions by a photo-activation method with the bremsstrahlung end point energies from 50- to 70-MeV and from 60- to 70-MeV with a step of Delta E = 10 MeV. The bremsstrahlung beam is produced by accelerated electrons bombarded into a thin tungsten target at Pohang Accelerator Laboratory (PAL). The yields are produced by photonuclear reactions that determined from the activated foil through characteristics gamma-spectra using a HPGe detector. The details of the formation of the isomers together with literature values of the investigated nuclides are compared and discussed.