Eur. Phys. J. A (2014) 50: 117
https://doi.org/10.1140/epja/i2014-14117-7

Regular Article - Experimental Physics

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

¹ Department of Physics, Kyungpook National University, 702-701, Daegu, Republic of Korea
² Research Center, Dongnam Institute of Radiological and Medical Science, 619-953, Busan, Republic of Korea
³ Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, 790-784, Pohang, Republic of Korea
⁴ Radiochemistry Division, Bhabha Atomic Research Centre, 400085, Mumbai, India
⁵ Nuclear Data Center, Korea Atomic Energy Research Institute, 305-353, Dajeon, Republic of Korea

^* e-mail: gnkim@knu.ac.kr

Received: 20 March 2014
Revised: 15 June 2014
Accepted: 19 June 2014
Published online: 25 July 2014

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 E _P = 15–45 MeV as well as those from the ⁸⁹Y(α, α2n) reaction with E _α = 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.