Isomeric yield ratios of 87m,gY from different nuclear reactions

Abstract

The independent isomeric yield ratios of 87m,gY produced from the 93Nb(γ, α2n) and natZr(γ, pxn) reactions with the end-point bremsstrahlung energy of 45–70 MeV have been determined by an off-line γ-ray spectrometric technique using 100 MeV electron linac at the Pohang accelerator laboratory, Korea. The isomeric yield ratios of 87m,gY were also determined from the natZr(p, αxn) and the 89Y(p,p2n) reactions with EP = 15–45 MeV as well as those from the 89Y(α, α2n) reaction with Eα = 32–43 MeV using the MC-50 cyclotron at the Korea Institute of Radiological and Medical Science, Korea. The isomeric yield ratios of 87m,gY from the present work in the 93Nb(γ, α2n), natZr(γ, pxn), natZr(p, αxn), 89Y(p,p2n), and 89Y(α, α2n) reactions were compared with those of the literature data in the 85Rb(α, 2n), the 86,87,88Sr(d, xn), 89Y(n,3n), and the 89Y(γ, 2n) reactions to examine the role of target, projectiles, and ejectiles through compound nucleus excitation energy and input angular momentum. The isomeric yield ratios of 87m,gY in the above eleven reactions were also calculated using the computer code TALYS 1.4 and compared with the experimental data. The different behaviors between photon- and neutron-induced reactions and charged-particle-induced reactions are discussed from the viewpoint of compound and non-compound (pre-equilibrium) process.