Directional Correlation of the Gamma Rays inW182

Abstract

Directional correlation measurements were performed on seven cascades involving the gamma rays in ${\mathrm{W}}^{182}$. The angular momenta of the excited states and the character of the gamma transitions which were determined by the correlation measurements are in good agreement with the values as determined by previous investigators. There is evidence for the existence of three rotational bands with the possibility of a fourth band in ${\mathrm{W}}^{182}$. The nature of these rotational bands is explained in terms of the Bohr-Mottelson model for spheroidal nuclei. The levels are characterized by the quantum numbers ($K, I, \pi$). After correction for x-ray interference the 1.222 Mev-0.068-Mev correlation results in a spin of 3 to the 1.290-Mev level. The 0.068-Mev gamma ray is essentially pure dipole radiation. The results of the 1.231 Mev-0.100-Mev correlation are in good agreement with spin 3 to the 1.331-Mev level with a quadrupole content of 2±0.5% for the 1.231-Mev radiation. The 0.152 Mev-1.222-Mev correlation is only in agreement with an assignment of spin 3 to the 1.374-Mev level with a quadrupole content of less than 0.5% for the 0.152-Mev transition. The 0.152 Mev-1.122-Mev correlation yields a quadrupole content of (3-11% or 94-99%) for the 1.122-Mev transition. The 0.222 Mev-1.231 Mev, 0.264 Mev-1.222-Mev correlations are in good agreement with the assignment of spin 4 to the 1.554-Mev level. However, spins of 3 or 5 for the 1.554-Mev level are also in agreement with the correlation data.