Decay of tungsten-189
Makaleler > Tam Makale · 2002
Yazarlar: S Mirzadeh, Fatma YURT, RM Lambrecht
APPLIED RADIATION AND ISOTOPES, SCI Expanded İndekslerine Giren Dergi, Uluslararası, 2002, cilt 57, ss 637-640
DOI: 10.1016/s0969-8043(02)00177-x
Özet
We studied the decay of W-189 as produced via the Os-192[n,alpha]W-189 reaction on a 99.9% isotopically enriched Os-192 target. The irradiations were performed at the intense neutron beam facility at Cyclotron Research Center, Universite Catholique Louvain-la-Neuve(CRC-UCL) (Belgium), where fast neutrons [E-n similar to20MeV, phi(n) = (4.8+/-0.3)10(11) ns(-1) cm(-2)] were generated by stopping 50 MeV deuterons on a thick Be target. The half-life of W-189 was determined to be 9.3+/-0.3min, compared to 10.8+/-0.2min obtained from the W-188[n,gamma]W-189 reaction. The energies of the two predominant gamma-rays of W-189, 260.4+/-1.3 and 421.7+/-1.4 keV were in good agreement with that from the [n,gamma] reaction, however, the relative intensities of the two T-rays were not consistent. From the [n,] reaction, the relative intensities of the 260 and 421 keV gamma-rays were 97 to 100, whereas from the [n,alpha] reaction the relative intensities were 100 to 77, respectively. Assuming a cross-section ratio of 20+/-5 for [n,p3n] to [n,alpha] reactions, a cross-section of 0.5+/-0.2 mb was suggested for the Os-192[n,alpha]W-189 reaction, and the absolute intensity of the 260 keV gamma-ray was estimated to be similar to50%. (C) 2002 Elsevier Science Ltd. All rights reserved.