Eric Gordon Wasserman

A New Measurement of the Strength of the Superallowed Fermi Branch in the Beta Decay of {sup 10}C with GAMMASPHERE

Abstract We report a new measurement of the strength of the superallowed 0 + →0 + transition in the β -decay of 10 C. The experiment was done at the LBNL 88-inch cyclotron using forty-seven GAMMASPHERE germanium detectors. The technique used in this measurement was similar to that of an earlier experiment, but the systematic corrections were significantly different. The measured branching ratio: 1.4665±0.0038×10 −2 is used to compute the superallowed Fermi f t, which gives the weak vector coupling constant and the u to d element of the Cabibbo–Kobayashi–Maskawa quark mixing matrix.

New measurement of the {beta}-{gamma} directional correlation in {sup 22}Na

We have measured the {beta}-{gamma} directional correlation coefficient A{sub 22} in the decay of {sup 22}Na to the 2{sup +} 1275 keV excited state of {sup 22}Ne. We find A{sub 22}=(5.3{plus_minus}2.5){times}10{sup {minus}4}. This measurement has higher precision but disagrees with most previous experiments. The value for A{sub 22}, combined with other experimental inputs, gives recoil-order form factors in disagreement with theoretical estimates. This experiment demonstrates the capabilities of Gammasphere as an instrument for precise {beta}-{gamma} correlation measurements. {copyright} {ital 1999} {ital The American Physical Society}