Electrostatic spectrometer for measurement of internal conversion electrons in the 0.1–20 keV region

Varga, D.; Kádár, Imre; Kövér, Á.; Cserny, I.; Mórik, Gyula; Brabec, V.; Dragoun, O.; Kovalı́k, A.; Adam, J.

doi:10.1016/0029-554x(82)90833-3

Cited by 46 publications

(16 citation statements)

References 3 publications

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“…The natural width of such a peak is determined by the natural widths of the corresponding atomic level and nuclear transition. In our investigations, we employed two different types of electron spectrometers: the differential electrostatic ESA12 [21,22] of the cylindrical-mirror type with second-order focusing, supplied with a retarding (accelerating) lens and a channel multiplier as an electron detector (Institute of Nuclear Physics, Academy of Sciences of the Czech Republic, Ř ež near Prague), and an integral spectrometer [23] with the magnetic adiabatic collimator with an electrostatic filter type -the MAC-E-Filter (Institute of Physics, University of Mainz, Germany). The first of the spectrometers operates in the 0-20 keV range with a relative instrument resolution ΔE/E= 0.011 in the "basic" mode and with an absolute resolution ΔE = 1 and 3 eV for electron energies of 2 keV and 7 keV, respectively, in the electron retardation mode (reduced transmission).…”

mentioning

confidence: 99%

Erratum to: “Development of a Super-Stable Datum Point for Monitoring the Energy Scale of Electron Spectrometers in the Energy Range up to 20 keV” by D. Vénos, M. Zbořil, J. Kašpar, O. Dragoun, J. Bonn, A. Kovalík, O. Lebeda, N. A. Lebedev, M. Ryšavý, K. Schlösser, A. Špalek, and Ch. Weinheimer, Vol. 53, No. 3, pp. 305–312, July, 2010

et al. 2010

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confidence: 99%

Erratum to: “Development of a Super-Stable Datum Point for Monitoring the Energy Scale of Electron Spectrometers in the Energy Range up to 20 keV” by D. Vénos, M. Zbořil, J. Kašpar, O. Dragoun, J. Bonn, A. Kovalík, O. Lebeda, N. A. Lebedev, M. Ryšavý, K. Schlösser, A. Špalek, and Ch. Weinheimer, Vol. 53, No. 3, pp. 305–312, July, 2010

et al. 2010

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“…The conversion electron measurements were carried out at l~e~ near Prague with the electrostatic cylindrical mirror spectrometer [5]. All spectra were measured in cycles with the exposure time of a few seconds per point in each cycle.…”

Section: Methodsmentioning

confidence: 99%

“…1. In this mode, the energy dependence of the channeltron efficiency had to be taken into account; going from 600 to 1,000 eV the efficiency decreased [5] by 17%. During preliminary experiments with another source, in which the Z~ ions were implanted into a platinum backing at kinetic energy of 15 keV, this ratio was 1/11.…”

Section: Methodsmentioning

confidence: 99%

Some nuclear and atomic properties of201Hg determined by conversion electron spectroscopy

Dragoun

Brabec

Ryšavý

et al. 1987

Z. Physik A - Atomic Nuclei

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Conversion electron measurements with an electrostatic spectrometer proved the existence of the 1,565 __ 6 eV transition in 2~The conversion intensity ratios, N1/N2 = 1.2+0.2, NI/N3 = 1.1 +0.2, N2/N3 =0.92_+0.15, N4/N3=0.03+O.02 and Ns/N3 =0.04 _+ 0.02 were determined. These values agree with our calculations for the M 1 + E2 multipolarity with the E 2/M 1 mixing ratio 62= (1.1 _+ 0.3) x 10-4 and exclude all pure multipolarities with L__<4. The total conversion coefficient for the above M1 +E2 mixture was evaluated to be (4.7_+0.7)x 104. The reduced B(M 1, 1/2 ~ 3/2) probability was derived to be (3.9_+ 1.2)x 10 .3 (eh/2Mc) 2. The natural widths of the N-subshell conversion lines in mercury were found to be F(N 0 = 8.3 _+ 1.5, F(N2)= 5.8 _+ 1.5 and F(N3)= 6.5 _+ 1.0 eV, Monte Carlo calculations of electron scattering in matter yielded the conversion line shapes in qualitative agreement with the experiment.

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“…The original source was prepared by vacuum evaporation onto Al backing and was contaminated by a usual hydrocarbon over layer 23 Within the search for an additional neutrino mass-state in the β-decay of 241 Pu (Q β = 20.8 keV, T 1/2 = 14.4 y) [209], the electron scattering and energy losses within a vacuum-evaporated source were carefully examined. The measurements were carried out with two electrostatic spectrometers [210], [211]. The individual elastic and inelastic scattering events were simulated using the Monte Carlo method.…”

Section: Previous Experimentsmentioning

confidence: 99%

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

Dragoun¹,

Vénos²

2016

PHY

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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.

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Electrostatic spectrometer for measurement of internal conversion electrons in the 0.1–20 keV region

Cited by 46 publications

References 3 publications

Some nuclear and atomic properties of201Hg determined by conversion electron spectroscopy

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

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