Forbidden Beta-Ray Spectra

Smith, A. M.

doi:10.1103/physrev.82.955

Cited by 43 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pursey showed that these spectra would contain energy-dependent interference terms, similar to those that Fierz had predicted for allowed spectra, if the decay interaction included both vector (V) and tensor (T) terms, or axial vector (A) and pseudoscalar (P) terms, or scalar (S) and axial vector (A) terms. 45 The failure to observe such terms further restricted the forms of the interaction.…”

Section: Beta-decay Theory After World War IImentioning

confidence: 99%

Are the Laws of Physics Inevitable?

Franklin

2008

Phys. perspect.

View full text Add to dashboard Cite

Section: Beta-decay Theory After World War IImentioning

confidence: 99%

Are the Laws of Physics Inevitable?

Franklin

2008

Phys. perspect.

View full text Add to dashboard Cite

“…1 In application of his method, one makes use of C n x V factors given for beta decay by Konopinski and Uhlenbeck 2 and Greuling 3 for pure interactions and by Smith 4 and Pursey 5 for interference terms arising from mixed interactions. We have used ZweifePs method to derive explicit formulas for /values appropriate for // comparisons with beta emitters.…”

mentioning

confidence: 99%

ftValues andLKRatios for Orbital Electron Capture

Hoff

Rasmussen

1956

Phys. Rev.

View full text Add to dashboard Cite

The calculation of// values for allowed and first forbidden orbital electron capture transitions is discussed. It is shown that ft values for A/=l, yes, orbital electron capture transitions, calculated using allowed/ functions, can be compared directly with ft values for similar transitions involving beta particle emission. The L/K electron capture ratios for Al~ 1, yes, transitions are shown generally to be the same as for allowed transitions of similar energy for a given element. Comparison with experimentally measured L/K capture ratios is made.

show abstract

“…+ (9/4) Mol f (pcr X "'ml ) 12]. (9) We put (10) then X and Y are real numbers13) .and except for the energy independent factor the correction factor becomes …”

mentioning

confidence: 99%

Theoretical Reinvestigation of the β-spectrum of RaE

Yamada¹

1953

Prog. Theor. Phys.

View full text Add to dashboard Cite

The S·spectrum of RaE is reinvestigated taking into account the finite de Broglie wave length effect pointed out by Rose et al. 'and the correction to' the nuclear matrix elements pointed out by the author, and it is shown that the conclusion of Petschek and Marshak that only the assumption of tensor + pseudoscalar, spin chan/Si 0-0, parity change yes is able to explain the experimental ,results is incorrect. Taking into account the above two effects, many other assumptions can explain the experiments. The results are as follows: TPo-o (tensor+pseudoscdar and spin change o-o), STI-O and VAt-O fit the experiments only with the finite de Broglie wave length effect, Ao-o (including APO-O) and VTI-O requires both elects, but VT1-'0 seems too artificial. Other cases can not fit the experiments_ § 1. Introduction and summary It has been well known long since that the p-spectrum of RaE deviates from the allowed shape, but there had been no definite theory to explain it. By the Mayer's nuclear shell model it is made clear that this transition is parity change yes, and last year Petschek and Marshak!) concluded that only the mixture of tensor and pseudoscalar interaction and spin change 0-0 (of course parity change yes) is able to explain the experiments. Some time after, however, Ahrens, Feenberg and Primakoff2) insisted using their method:!) to evaluate the ratios between nuclear matrix elements that the nuclear matrix element \l1r;; in pseudoscalar type is very small and the large ratio of the coupling constantslGI'/GII ~133 is required to fit the Petschek's and Marshak's interpretation.However, this large ratio causes many awkward affairs, * and recently Ruderman 6 ) has shown that if the nuclear force includes a large pro type one the relation of Ahrens, Feenberg and PrimakofPl becomes invalid and the magnitude of \J9rs is of the order of other momentum type nuclear matrix elements (\ a, I pa and frs). According to his theory it is sufficient to take the coupling constant Gp to the same order as G 7 , to fit the result of Petschek and Marshak!)On the other hand, if the 'nuclear force is entirely due to the pseudovector coupling of 1r-mesons, the evaluation of Ahrens, Feenberg and Primakoff2) is valid, and a large pseudoscalar coupling constant is required. Therefore, if the foundation of the article of Petschek and Marshak were reliable and if it becomes clear that a * First, as pointed out by Ahrens, Feenberg and Primako£f2) a new nuclear matrix element should be added to the old one, ISr". The effect of this new nuclear matrix element to the S,speetrum of RaE will be examined by Takebe. 4 ) Moreover, this large coupling constant destroys the allowed shape of high energy 6-spectra.5) Also Cf. t'eferenee 6.

show abstract

Forbidden Beta-Ray Spectra

Cited by 43 publications

References 6 publications

Are the Laws of Physics Inevitable?

Are the Laws of Physics Inevitable?

ftValues andLKRatios for Orbital Electron Capture

Theoretical Reinvestigation of the β-spectrum of RaE

Contact Info

Product

Resources

About