Nicholas Stone

Abstract:

A low temperature nuclear orientation experiment has been performed on the 14.8d²²⁵Ra activity. Gamma anistotropy [²²¹Fr (4.8m) and²¹³Bi (45.6m)] and alpha anisotropy [²²⁵Ac (10.0d),²²¹Fr,²¹⁷At (32.3ms) and²⁰⁹Po (4.2μs)] measurements has been carried out and values for the hyperfine field of²²⁵Ac and²²¹Fr in iron and the magnetic moment of²¹³Bi are reported. © 1992 J.C. Baltzer A.G., Scientific Publishing Company.

Abstract:

Assignments for the principal Nilsson configuration in light β+-decaying bromine isotopes were proposed in a contribution to the OLNO-1 conference. These assignments were made on the basis of magnetic moments derived from the temperature dependence of anisotropies in daughter Se isotopes observed in the DOLIS-COLD facility at Daresbury. Anisotropy measurements have since been extended to a lower base temperature in74 mBr and72 gBr decay, leading to more stringent limits on the ground state moment of72Br. The proposed π[312]3/2 configuration for75Br has also now been confirmed by a measurement of the sign of its magnetic moment. This was done by observing the β-asymmetry in75Br decay using high purity Si detectors mounted within the dilution refrigerator. © 1992 J.C. Baltzer A.G., Scientific Publishing Company.