A High Resolution Nuclear Spectrometer

Langer, Lawrence M.; Cook, C. Sharp

doi:10.1063/1.1741239

Cited by 80 publications

(7 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The beta-ray spectrum was obtained with a hollow anthracene scintillation spectrometer and with a 40-cm radius, high resolution, shaped magnetic field spectrometer. 9 For the latter studies, sources were transported to Indiana University after irradiation and extraction of the Nb 90 at ORNL. Thus, essentially carrier-free sources were used with the magnetic spectrometer.…”

Section: Experimental Methodsmentioning

confidence: 99%

Nuclear Structure ofZr90

et al. 1958

View full text Add to dashboard Cite

PROBABILITY OF excitation energy for this relatively narrow range of excitation energies. Batzel 5 has analyzed the data for the 340-Mev proton-induced spallation of uranium 30 and concludes that the assumption that T n /T F is independent of excitation energy is a better approximation than the assumption that the probability of emission of a neutron increases much more rapidly as a function of excitation energy than does the probability of fission. If one considers the mean value of T n /T F obtained from an (a,4») cross section to approximate that of the intermediate product halfway along the neutron evaporation chain, it is possible to compare the mean values of T n /T F obtained from (a y An) cross sections with values from fast neutron fission cross sections in the two cases for the hypothetical average compound nuclei U 234 -U 235 and Pu 240 -Pu 241 . The mean value of T n /T F obtained from cross sections for the Th 232 (a,4^)U 232 reaction is 0.86 for an approximate average excitation energy of 25 Mev, .while the average value from fast neutron fission cross sections 31 of U 233 and U 234 is 0.78 for an 30 M. Lindner and R. N. Osborne, Phys. Rev. 102, 378 (1956). 31 Fission cross sections were taken from a recent compilation by W. D. Allen and R. L. Henkel which is to appear in Progress

show abstract

Section: Experimental Methodsmentioning

confidence: 99%

Nuclear Structure ofZr90

et al. 1958

View full text Add to dashboard Cite

show abstract

“…Magnetic spectrometer [93] with an electron orbit of 40 cm. The iron pole pieces produced the radially inhomogeneous magnetic field that yielded better focus at 180° than a homogenous field.…”

Section: Fig (8)mentioning

confidence: 99%

Constraints on the Active and Sterile Neutrino Masses from Beta-Ray Spectra: Past, Present and Future1

Dragoun¹,

Vénos²

2016

PHY

View full text Add to dashboard Cite

Abstract:Although neutrinos are probably the most abundant fermions of the universe their mass is not yet known. Oscillation experiments have proven that at least one of the neutrino mass states has m i > 0.05 eV while various interpretations of cosmological observations yielded an upper limit for the sum of neutrino masses ∑m i < (0.14 -1.7) eV. The searches for the yet unobserved 0νββ decay result in an effective neutrino mass m ββ < (0.2 -0.7) eV. The analyses of measured tritium β-spectra provide an upper limit for the effective electron neutrino mass m(v e ) < 2 eV. In this review, we summarize the experience of two generations of β-ray spectroscopists who improved the upper limit of m(v e ) by three orders of magnitude. We describe important steps in the development of radioactive sources and electron spectrometers, and recapitulate the lessons from now-disproved claims for the neutrino mass of 30 eV and the 17 keV neutrino with an admixture larger than 0.03%. We also pay attention to new experimental approaches and searches for hypothetical sterile neutrinos.

show abstract

“…6 Certain improvements on the original design have been made, and these have been discussed in previous papers. [7][8][9] In addition, two other changes should be mentioned.…”

Section: Spectrometermentioning

confidence: 99%

“…Experiments have been reported by Hayward and Fuller, 2 Beckman and Sandstrom, 3 Booth, 4 Vanhuyse and Vanpraet, 5 and by Seward et al 6 In these experiments the nuclei to be investigated were exposed to continuous x-ray spectra as obtained from electron accelerators, and the scattered radiation analyzed. Since such x-ray beams are continuous in energy up to a specific maximum, all energy levels of the nuclei irradiated below this maximum energy can be excited.…”

Section: Introductionmentioning

confidence: 99%

Mean Lifetimes of the First Excited States ofLi7andNa23by Reson

1962

View full text Add to dashboard Cite

A 1.4-MeV electron accelerator was used as a source of bremsstrahlung to determine the widths T, and, hence, the mean lifetimes r, of the first excited states of Li 7 and Na 23 . Self-absorption experiments were performed in both cases. For the 480-keV level in Li 7 the following results were obtained: T= (5.28±0.27) X10 -3 eV, corresponding to r= (1.25±0.06)X10-13 sec. For the 440-keV level in Na 23 the results obtained were r= (3.66±0.50)XH)-4 eV, corresponding to r= (1.80db0.28)X10-12 sec.

show abstract

A High Resolution Nuclear Spectrometer

Cited by 80 publications

References 3 publications

Nuclear Structure ofZr90

Nuclear Structure ofZr90

Constraints on the Active and Sterile Neutrino Masses from Beta-Ray Spectra: Past, Present and Future1

Mean Lifetimes of the First Excited States ofLi7andNa23by Reson

Contact Info

Product

Resources

About