Brice M. Rustad

Post-deadline paper by Rustad and Ruby

B. M. Rustad and S. L. Ruby
American Physical Society meeting
Jan 28 1958

Text and abstract not recorded. 
Franklin summarizes as mea culpa
. Other papers cite as acknowledgement of error.

The Beta-Spectrum of He6

C. S. Wu, B. M. Rustad, V. Perez-Mendez, and L. Lidofsky
Physical Review
Aug 5 1952

Used Columbia spectrometer to calculate revised comparative lifetime of He6


The end point together with tg=0.823 yields the ft value of He' of 815~70 sec.' Moszkowski4 estimated the relative contribution of P and G —T interactions by equating ft M ' for the H3—He3 and He6—Li6 transitions. Using the old He6 "ft"value he obtained E=Cg'/CG'=0. 11~0.45, which leads to the conclusion of the insignificant role of the F interaction in beta-decay.

If one repeats the calculation of Moszkowski using the new ft values for He6 one obtains K&1.4&0.7 which completely alters the picture. The recent finding of the C' —8"* and 0'4 —N'4* transitions which should be allowed and favored 0—0 transitions, demonstrates that the presence of the Fermi interaction in the beta-process is definitely necessary.

Correlation Between Electron and Recoil Nucleus in He-6 Decay

Brice M. Rustad and Stanley L. Ruby
Physical Review
Dec 31 1952

First publication of Rustad-Ruby results. Together with Allen-Jentschke, seen as definitive determination of Tensor coupling in GT interactions


A STUDY of the correlation between the electron and the recoil nucleus in the He6-Li6 decay has been made to determine whether the tensor or axial vector interaction should be retained in the formulation of beta-theory. The remaining interactions, scalar, polar vector, and pseudoscalar, are forbidden for this particular transition on the basis of the allowed ft value of 815~70 seconds' and the nuclear spin change' b,I=1.


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