The Kπ = 2 − octupole vibration band in 182W

Abstract

An investigation of the electromagnetic properties of the K π = 2 − octupole band in 182W populated in the β − decay of 182Ta was undertaken. The multipolarity mixings of the intraband 114 keV and 85 keV transitions were determined from L-subshell measurements. The mixing parameters δ 2(E2/M1) are 0.130(7) and 0.124(2) respectively. The directional correlations of the (100–1121) keV, (100–1157) keV and (100–1189) keV cascades were investigated. The E1, M2, E3 mixing of the 1189 keV transition was extracted from the angular correlation coefficients and conversion data taken from the literature. We get a mixing of (57.0 ± 3.7) % E1 + (13.7 ± 1.9) % M2 + (29.3 ± 6.6) % E3. A centroid shift determination of the lifetime of the 3 −(1374keV)state gave the result τ = 112 ± 15 ps. From this we obtain the reduced E3 transition probability from the ground state as B(E3; O + → 3 −) = (8.0 ± 1.2) · 10 4 e 2 · fm 6 = (41 ± 6)SPU. The g-factor of this state was measured using the integral PAC method in the hyperfine field of an iron host lattice yielding g = 0.32(9). The experimental data are discussed in terms of the collective model taking into account Coriolis coupling.