Magnetic moment of the three-quasiparticle state in 177Ta

Abstract

An experimental investigation was made of the γ-transitions feeding or de-exciting the 1355 keV isomeric state in 177Ta. The E2/M1 mixing ratios for the 311 keV interband transition from the isomer and for the 271 keV and the 295 keV intraband transitions within the rotational band on the isomer were determined to be δ = 0.29 −0.06 +0.11, 0.25 −0.03 +0.05 and 0.30 −0.08 +0.06, respectively, employing combined measurements of the linear polarization and angular distribution of the γ-rays with the aid of conversion electron measurements. Spin and parity assignments of the isomer were confirmed to be 21 2 − . The half-life of the isomer was remeasured to be T 1 2 = 5.0 ± 0.2 μ s and the magnetic moment was found to be μ = 0.080 ± 0.014 μ N. The g K and g R factors for the band on the isomer were deduced separately to be g K = 2 21 2 − 0.062 −0.008 +0.11 and g R = −0.56 −0.13 +0.09 . Comparing the experimental g K factor with the theoretical value, it was found that the configuration of the isomer is 21 2 −( P 7 2 +[404] N 5 2 −[512] N 9 2 +[624] . The B(E2) and B(M1) probabilities for the interband transitions were deduced. Discussion concerning the mixed state which caused the interband transitions is based on the experimental B(E2) ratio within the framework of single K m , mixing.