Mixing Ratios of Transitions in the Decay ofIr192

Abstract

Mixing ratios of the 485-keV transition in Os 192 and the 296-, 308-, and 604-keV transitions in Pt 192 populated from the decay of Ir 192 were measured using the 7-7 directional-correlation method. In addition, the 468-316-keV, 589-612-keV, 885~316-keV, and 1063-316-keV 7-7 directional correlations in Pt 192 have been remeasured. Coaxial and planar Ge(Li) detectors and Nal(Tl) scintillation detectors were used in different combinations depending on the energy resolution required for a particular measurement. The results for the mixing ratios are 5 48& = + (10.9"i. 5 + 2 -1 ), 5 29 6= -(9.1_i. 7 + 2 -7 ), 5308= -(9.9±1.0), and §6o4-+ (2.0±0.2). The over-all agreement of the signs, as well as the absolute values of the mixing ratios with predictions of the pairing-plus-quadrupole model of Kumar and Baranger, is good.

Measurement of theg-factor of the 21 + state of192Pt in an external magnetic field

“…We can, however, compare the TF results for the 2~ state of 194pt with our result since the ratio g(2/, a94pt)/g (2[, 192pt) is well known, free of systematic errors, from the careful IPAC experiments of Katayama et al [4] done with the identical 192irF e sample: g(2 +, '94pt) coLV(2 +, 194pt) T(2~, 192pt) g(2 +, a92p~-coL.C(2 +, 192pt ) T(2 +, 194pt ) = 1.02 (6) 2.1.06 (2) 3 --1.08 (6). We can, however, compare the TF results for the 2~ state of 194pt with our result since the ratio g(2/, a94pt)/g (2[, 192pt) is well known, free of systematic errors, from the careful IPAC experiments of Katayama et al [4] done with the identical 192irF e sample: g(2 +, '94pt) coLV(2 +, 194pt) T(2~, 192pt) g(2 +, a92p~-coL.C(2 +, 192pt ) T(2 +, 194pt ) = 1.02 (6) 2.1.06 (2) 3 --1.08 (6).…”

“…In order to investigate its magnitude and to correct for it we have applied the following procedure: we have analysed very carefully the effect of the superposition of all cascades contributing to the background (including triple and sum peak cascades) using the known values of their relative intensities and anisotropies [4][5][6] and the known ratio COLZ(2+)/COLT(2 +) of the integral rotations in the second and first excited 2 + state [4]. The oversimplifying linear interpolation of the rather large Compton background under the ~468 keV peak produces, of course, a systematic error, but it turned out that this error is quite small.…”