B. W. Ridley

Experimental physicist trained at Cambridge. Doctoral dissertation assessed state of angular correlation experiments in 1953. His results contrary to Rustad-Ruby were pre-announced at the Rehovoth conference in September 1957. Later, he provided Allan Franklin with materials for his historical assessment. 

The Measurement of Electron-Neutrino Angular Correlations [and Discussion]

B. W. Ridley and discussants
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences
Aug 26 1958
Excerpt(s): 

A. Salam, Imperial College: Could Dr Ridley say, if he were asked to choose between these two diagrams, which would he prefer?
B. W. Ridley: I think I am all right in saying that the 35A point is fairly certain, because it would have to move a very long way to change the picture significantly, and one feels that the 19Ne results are significant, merely from the weight of what are now four inde- pendent experiments. A. Salam: So you would be inclined to discount the 6He experiments if you had to choose?

Nuclear Recoil in Beta Decay

B. W. Ridley
Jan 1 1954
Comment(s): 

Franklin pro-He6 citation
PhD thesis

THE ELECTRON-NEUTRINO ANGULAR CORRELATION IN BETA DECAY OF HELIUM 6

B. W. Ridley
Nuclear Physics
Jan 23 1961
Excerpt(s): 

On the debit side, apart from smaller counting rates, coincidence experiments are generally more critically sensitive to the distribution of activity within and near the source volume on account of changing solid angle efficiencies. Uncertainty in the source distribution has in the past led to serious errors in both r-recoil angular correlations 18, ~) and in recoil T.O.F. distributions zl, a).

THE ELECTRON-NEUTRINO ANGULAR CORRELATION IN DECAY OF Ne-23

B. W. Ridley
Nuclear Physics
Nov 18 1957
Comment(s): 

Finds Ruby-Rustad in disagreement with other recent results

Excerpt(s): 

Individual angular correlations can be interpreted uniquely only when either Fermi or G.T. nuclear matrix elements are eliminated by selection rules. In the pure G.T. decay of Hes, Rustad and Ruby ‘) found that CI= +0.36f0.10 and +0.31&0.14 in two measurements, implying a predominantly T interaction. Pure Fermi emitters are comparatively rare and so far none has been found suitable for recoil experiments. However, mixed transitions (occurring when dJ = 0, not 0 + 0) can yield information about the Fermi interaction if the ratio of Fermi to G.T.


If we assume that both the major transitions from Ne23 are pure G.T., then the value a = -O.OS&O.lO implies that 0.86 5 X 5 1.62. This appears to be in serious disagreement with the result -0.5 5 X s +0.3 quoted by Rustad and Ruby 7) for another pure G.T. emitter, He6. The He6 result, however, was evaluated on the basis of the old parity conserving beta decay theory in which an admixture of T and A interactions necessarily implies the existence of a Fierz interference term.

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