Mössbauer effect studies of the 58 keV level of 159Tb

✍ Scribed by U. Atzmony; E.R. Bauminger; S. Ofer

• Publisher: Elsevier Science
• Year: 1966
• Weight: 553 KB
• Volume: 89
• Category: Article
• ISSN: 0029-5582
• DOI: 10.1016/s0029-5582(66)80104-9

✦ Synopsis

The recoilless absorption spectra of the 58 keV ;~-rays from 159mTb in Z59Tb situated m Tb~O~, TbA12, Tb metal and TbFe 2 have been measured at temperatures ranging from 20 ° K to room temperature. The sources used were 159Dy and 159Gd in oxide form. All absorbers gave unsplit absorption lines. From the width measured at room temperature with an oxide source and absorber, a value of T_g_ ~ (1.054-0.15) × 10 -a° sec was deduced for the half-life of the 58 keV level. From the broadened absorption line obtained with the Tb metal absorber, a value of 1.50±0.10 n.m. was obtained for the magnetic moment of the 58 keV level of ~59Tb, though a value of 2.104-0.15 n.m. cannot unambiguously be excluded. The line width and shape obtained with a TbFe2 absorber, where the internal field is about 15 % higher than in Tb metal, are consistent with the above mentioned magnetic moment of the excited state. E[ NUCLEAR REACTION 159Tb(7' 7)' E = 58 keV; I measured Mtissbauer absorption. 15~Tb level deduced a, b, #.