Statistical issues in the 17-keV neutrino experiments

Bonvicini, G.

doi:10.1007/bf01290345

Cited by 14 publications

(6 citation statements)

References 17 publications

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“…The endpoint, 231.37 +0.10keV could be compared with the value of 231.7 _+ 0.7 keV listed by Wapstra and Audi [10] and the value of 231.6 _+ 0.3 keV recently listed in the 1993 Atomic Mass Evaluation [11]. Our value differs from the value of 231.0 keV obtained by Wietfeldt et al [1][2][3][4][5][6][7] (the uncertainty of QEc is not given in [7]). …”

Section: Decay Energymentioning

confidence: 62%

“…The experiments since 1985 fall into two categories, characterized by how the energies of the decay electrons are measured: magnetic spectrometer or solid-state detector. All the evidence for a 17-keV neutrino has come from experiments that employed solid-state detectors; no positive results have been obtained with magnetic spectrometers (for review see [2][3][4]). …”

Section: Introductionmentioning

confidence: 99%

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TheQ EC dependence of evidence for a 17-keV neutrino from the55Fe radiative decay

Daszewski

Janas

Kurcewicz

et al. 1995

Z. Physik A - Hadrons and Nuclei

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Abstract. The internal bremsstrahlung spectrum of 55Fe was studied using HPGe detector in low background and reduced pileup conditions. The data show that the conclusion on the presence of a heavy mass neutrino strongly depends from the experimental decay energy value taken in the analysis. The decay energy was found to be Q~c = 231.37 _+ 0.10 keV. The obtained results also show the need for the higher accuracy QEc used in the analysis of the existence of a 17-keV neutrino in the 55Fe decay.

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Section: Decay Energymentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

TheQ EC dependence of evidence for a 17-keV neutrino from the55Fe radiative decay

Daszewski

Janas

Kurcewicz

et al. 1995

Z. Physik A - Hadrons and Nuclei

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“…"It is therefore difficult to see how these experiments can rule out a 1 % effect, which requires an accuracy of perhaps 0.2% over the analyzed region" (Simpson, 1992, p. 598). 43 Simpson's view of the early negative magnetic spectrometer results was strongly supported by Bonvicini's work [published first as a 1992 CERN report (CERN-PPE/92-54) and later as Bonvicini (1993)]. 44 In this work Bonvicini discussed the question of whether a kink in the energy spectrum due to an admixture of a 17-keV neutrino could be masked by the presence of unknown distortions, such as the shape-correction factors used in magnetic spectrometer experiments.…”

Section: A the Tide Ebbsmentioning

confidence: 96%

“…A second summary appeared inMorrison (1992b).37 Bonvicini (1993) also considered tritium experiments to be too limited statistically.Rev. Mod.…”

mentioning

confidence: 99%

The appearance and disappearance of the 17-keV neutrino

Franklin

1995

Rev. Mod. Phys.

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It is a fact of life in empirical science that experiments often give discordant results. This is nowhere better illustrated than in the recent history of experiments concerning the existence of a heavy, 17-keV neutrino. The 17-keV neutrino was first "discovered" by Simpson in 1985. The initial replications of the experiment all gave negative results, and suggestions were made that attempted to explain Simpson's result using accepted physics, without the need for a heavy neutrino. Subsequent positive results by Simpson and others led to further investigation. Several of these later experiments found evidence supporting that claim, whereas others found no evidence for such a particle. Some theorists attempted to explain away the result, and others tried to explain it and to incorporate it within existing theory without the need for a new particle, or to look for the further implications of such a particle, or to propose a new theory that would incorporate the new particle. The question of the existence of such a heavy neutrino remained for several years. Recently, doubt has been cast on the two most convincing positive experimental results, and errors have been found in those experiments. In addition, recent, extremely sensitive experiments have found no evidence for the 17-keV neutrino. The consensus is that it does not exist. The discord has been resolved by a combination of finding errors in one set of experiments and a preponderance of evidence.

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“…A recent work by Bonvicini [19] looked at the correlation between arbitrary shape corrections and a heavy neutrino signal, but failed to infer the importance of the difference in end point between the null and the positive fits for the HJ91 data.…”

mentioning

confidence: 99%

β-decay end point and heavy neutrino searches

Bahran

Kalbfleisch

1993

Phys. Rev. D

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We carefully consider the relation between the 8-decay end point and heavy neutrino mixing relative to the least x2 fitting procedure. We examine the 1991 experimental results of Hime and Jelley by considering variations due to end-point energy, radiative corrections, and spectrum pileup. We show that their result can be made consistent with the null hypothesis within 3 standard deviations. From consideration of end-point effects we conclude that the spectral region very near to the end point is questionable at best and should be ignored in the analysis of the data. These findings apply to any search for heavy neutrino mixing near the end point of 8 decay.PACS numberh): 23.40. Bw, 12.15.Ff, 14.60.Gh, 29.30.Dn Recent controversy regarding the existence of a heavy neutrino in /3 decay has attracted attention [I-181. A t issue is a spectral excess below Q -17, where Q is the end-

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Statistical issues in the 17-keV neutrino experiments

Cited by 14 publications

References 17 publications

TheQ EC dependence of evidence for a 17-keV neutrino from the55Fe radiative decay

TheQ EC dependence of evidence for a 17-keV neutrino from the55Fe radiative decay

The appearance and disappearance of the 17-keV neutrino

β-decay end point and heavy neutrino searches

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