Das �-Spektrum des nat�rlichen Rhenium 187

Huster, E.; Verbeek, H.

doi:10.1007/bf01322058

Cited by 19 publications

(6 citation statements)

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“…Brodzinski and Conway [5] and Huster and Verbeek [7] used a simplified form for the theoretical spectral shape in the analysis of their data. Payne [6], on the other hand, used the complete expression, included the effects of finite nuclear size but did not consider screening corrections.…”

Section: Resultsmentioning

confidence: 99%

Beta decay ofRe187and cosmochronology

Ashktorab

1993

Phys. Rev. C

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Uncertainties which limit the use of the Re-Os isobaric pair as a cosmochronometer for the age of the galaxy and the universe include those of the partial half-lives of the continuum and boundstate decays of Re. While the total half-life of the decay is well established, the partial half-life for the continuum decay is uncertain, and several previous measurements are not compatible with each other. A high-temperature quartz proportional counter has been used in this work to remeasure the continuum decay of Re by introducing a metallo-organic rhenium compound into the counting gas. The measured beta end-point energy for the continuum decay of neutral Re to singly ionized Os of 2.70 + 0.09 keV agrees with earlier results. However, the present half-life measurement of (45 + 3) Gyr agrees within the quoted uncertainties only with an earlier measurement. The new half-life for the continuum decay and the recently reported total half-life of (43.5 6 1. 3) Gyr yield a branching ratio for the bound-state decay into discrete atomic states of (3 + 6) %%uo. This is in agreement with the most recent calculated theoretical branching ratio of approximately 1%.

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Section: Resultsmentioning

confidence: 99%

Beta decay ofRe187and cosmochronology

Ashktorab

1993

Phys. Rev. C

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“…and Verbeek [188] using gas proportional counters. From those early measurements, they determined a Q value of 2.6 keV.…”

Section: B the Mac-e Filter And Katrinmentioning

confidence: 99%

Direct Measurements of Neutrino Mass

Formaggio,

de Gouvêa,

Robertson

2021

Preprint

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The turn of the 21st century witnessed a sudden shift in our fundamental understanding of particle physics. While the minimal Standard Model predicts that neutrino masses are exactly zero, the discovery of neutrino oscillations proved the Standard Model wrong. Neutrino oscillation measurements, however, do not shed light on the scale of neutrino masses, nor the mechanism by which those are generated. The neutrino mass scale is most directly accessed by studying the energy spectrum generated by beta decay or electron capture -a technique dating back to Enrico Fermi's formulation of radioactive decay. In this Article, we review the methods and techniques -both past and present -aimed at measuring neutrino masses kinematically. We focus on recent experimental developments that have emerged in the past decade, overview the spectral refinements that are essential in the treatment of the most sensitive experiments, and give a simple yet effective protocol for estimating the sensitivity. Finally, we provide an outlook of what future experiments might be able to achieve. Contents I. Introduction II. Neutrino Masses: Current Status A. Neutrino oscillations B. Neutrinoless double beta decay C. Cosmology D. Neutrinos from Astrophysical Sources -Time of Flight

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“…13.8 keV). [31][32] The very soft /3-rays are absorbed by solid rhenium compounds, but an accurate determination of the /3-spectrum was achieved using gaseous -Cp2ReH. 32 The measured half-life for decay to continuum states, (6.6 ± 1.3) X 1010 yr,31 Is longer than the total half-life, (4.3 ± 0.5) X 1010 yr, estimated from 187Re/ 1870s ratios In geologically dated molybdenites,33 because 50 ± 30% of disintegrations are to bound atomic states.…”

Section: General Properties Of the Elementmentioning

confidence: 99%