scholarly journals Erratum: Generation and monitoring of directed neutrino beams using electron-capture β-decay sources [Phys. Rev. C 86, 034615 (2012)]

2019 ◽  
Vol 99 (3) ◽  
Author(s):  
C. DeAngelis ◽  
L. M. Folan ◽  
V. I. Tsifrinovich
Keyword(s):  
Electron Capture ◽  
Β Decay

scholarly journals Electron-capture modes with realistic nuclear structure calculations

2019 ◽  
Vol 21 ◽  
pp. 4
Author(s):  
P. G. Giannaka ◽  
T. S. Kosmas
Keyword(s):  
Electron Capture ◽  
Cross Sections ◽  
Nuclear Reactions ◽  
Random Phase ◽  
Point Of View ◽  
Electron Neutrino ◽  
Β Decay ◽  
Decay Modes ◽  
Theory Point ◽  
Nuclear Structure Calculations

Nuclear electron capture posses prominent position among other weak interaction processes occuring in explosive nucleosynthesis. In particular, this process plays important role in the core-colapse of massive stars by modifying the electron to baryon ratio Ye. From a nuclear theory point of view, such processes may be studied by using the same nuclear methods (e.g. the quasi-particle random phase approximation, QRPA), employed in the present work with these used for the one-body charge changing nuclear reactions (β-decay modes, charged-current electron-neutrino absorption by nuclei, etc). In this work we calculate e−-capture cross sections on 56Fe using two different approaches. At first, original cross section calculations are perfored by using the pn-QRPA method considering all the accessible transitions of the final nucleus 56Mn. Secondly, we evaluate the Gamow-Teller strength distributions and obtain the cross sections at the limit of zero-momentum transfer. The agreement between the two methods is very good.

Electron-capture decay ofTc100and the double-β decay ofMo100

1993 ◽  
Vol 47 (6) ◽  
pp. 2910-2915 ◽  
Author(s):  
A. García ◽  
Y-D Chan ◽  
M. T. F. da Cruz ◽  
R. M. Larimer ◽  
K. T. Lesko ◽  
...  
Keyword(s):  
Electron Capture ◽  
Β Decay ◽  
Electron Capture Decay ◽  
Double Β Decay

scholarly journals Strong neutrino cooling by cycles of electron capture and β− decay in neutron star crusts

Nature ◽  
2013 ◽  
Vol 505 (7481) ◽  
pp. 62-65 ◽  
Author(s):  
H. Schatz ◽  
S. Gupta ◽  
P. Möller ◽  
M. Beard ◽  
E. F. Brown ◽  
...  
Keyword(s):  
Neutron Star ◽  
Electron Capture ◽  
Β Decay

scholarly journals Electron capture detector based on a non-radioactive electron source: operating parameters vs. analytical performance

2017 ◽  
Vol 6 (2) ◽  
pp. 381-387 ◽  
Author(s):  
Erik Bunert ◽  
Ansgar T. Kirk ◽  
Jens Oermann ◽  
Stefan Zimmermann
Keyword(s):  
Electron Capture ◽  
Detection Limits ◽  
Electron Source ◽  
Analytical Performance ◽  
Electron Capture Detector ◽  
Operating Parameters ◽  
Free Electrons ◽  
Β Decay ◽  
Radioactive Materials ◽  
Electron Capture Detectors

Abstract. Gas chromatographs with electron capture detectors are widely used for the analysis of electron affine substances such as pesticides or chlorofluorocarbons. With detection limits in the low pptv range, electron capture detectors are the most sensitive detectors available for such compounds. Based on their operating principle, they require free electrons at atmospheric pressure, which are usually generated by a β− decay. However, the use of radioactive materials leads to regulatory restrictions regarding purchase, operation, and disposal. Here, we present a novel electron capture detector based on a non-radioactive electron source that shows similar detection limits compared to radioactive detectors but that is not subject to these limitations and offers further advantages such as adjustable electron densities and energies. In this work we show first experimental results using 1,1,2-trichloroethane and sevoflurane, and investigate the effect of several operating parameters on the analytical performance of this new non-radioactive electron capture detector (ECD).

scholarly journals β-DECAY OF KEY TITANIUM ISOTOPES IN STELLAR ENVIRONMENT

2011 ◽  
Vol 20 (03) ◽  
pp. 705-719
Author(s):  
JAMEEL-UN NABI ◽  
IRGAZIEV BAKHADIR
Keyword(s):  
Electron Capture ◽  
Large Scale ◽  
Massive Stars ◽  
Random Phase ◽  
Neutrino Energy ◽  
Decay Rates ◽  
Β Decay ◽  
Quasiparticle Random Phase Approximation ◽  
Stellar Temperatures ◽  
Titanium Isotopes

Amongst iron regime nuclei, β-decay rates on titanium isotopes are considered to be important during the late phases of evolution of massive stars. The key β-decay isotopes during presupernova evolution were searched from available literature and a microscopic calculation of the decay rates were performed using the proton–neutron quasiparticle random phase approximation (pn-QRPA) theory. As per earlier simulation results, electron capture and β-decay on certain isotopes of titanium are considered to be important for the presupernova evolution of massive stars. Earlier the stellar electron capture rates and neutrino energy loss rates due to relevant titanium isotopes were presented. In this paper we finally present the β-decay rates of key titanium isotopes in stellar environment. The results are also compared against previous calculations. The pn-QRPA β-decay rates are bigger at high stellar temperatures and smaller at high stellar densities compared to the large scale shell model results. This study can prove useful for the core-collapse simulators.

The electron capture and β+ decay of 132Cs

1974 ◽  
Vol 227 (3) ◽  
pp. 506-512 ◽  
Author(s):  
S.C. Goverse ◽  
J.C. Klein ◽  
J. Kuijper ◽  
J. Blok
Keyword(s):  
Electron Capture ◽  
Β Decay

Precise measurement of the β decay and electron capture ofNa22,Au198, andAu196in low-temperature metal hosts, and reexamination of lifetime modifications

2008 ◽  
Vol 77 (6) ◽  
Author(s):  
Götz Ruprecht ◽  
Christof Vockenhuber ◽  
Lothar Buchmann ◽  
Russell Woods ◽  
Chris Ruiz ◽  
...  
Keyword(s):  
Low Temperature ◽  
Electron Capture ◽  
Precise Measurement ◽  
Β Decay

scholarly journals Production of <sup>40</sup>Ar by an overlooked mode of <sup>40</sup>K decay with implications for K-Ar geochronology

Geochronology ◽  
2020 ◽  
Vol 2 (2) ◽  
pp. 355-365
Author(s):  
Jack Carter ◽  
Ryan B. Ickert ◽  
Darren F. Mark ◽  
Marissa M. Tremblay ◽  
Alan J. Cresswell ◽  
...  
Keyword(s):  
Electron Capture ◽  
Decay Mode ◽  
Ground State ◽  
Decay Constant ◽  
Decay Rates ◽  
Theoretical Argument ◽  
Β Decay ◽  
Systematic Uncertainties ◽  
Dating Methods ◽  
Ar Geochronology

Abstract. The decay of 40K to the stable isotopes 40Ca and 40Ar is used as a measure of time for both the K-Ca and K-Ar geochronometers, the latter of which is most generally utilized by the variant 40Ar∕39Ar system. The increasing precision of geochronology has forced practitioners to deal with the systematic uncertainties rooted in all radioisotope dating methods. A major component of these systematic uncertainties for the K-Ar and 40Ar∕39Ar techniques is imprecisely determined decay constants and an incomplete knowledge of the decay scheme of 40K. Recent geochronology studies question whether 40K can decay to 40Ar via an electron capture directly to ground state (ECground), citing the lack of experimental verification as reasoning for its omission. In this study, we (1) provide a theoretical argument in favor of the presence of this decay mode and (2) evaluate the magnitude of this decay mode by calculating the electron capture to positron ratio (ECground/β+) and comparing calculated ratios to previously published calculations, which yield ECground/β+ between 150–212. We provide support for this calculation through comparison of the experimentally verified ECground/β+ ratio of 22Na with our calculation using the theory of β decay. When combined with measured values of β+ and β− decay rates, the best estimate for the calculated ECground/β+ for 40K yields a partial decay constant for 40K direct to ground-state 40Ar of 11.6±1.5×10-13 a−1 (2σ). We calculate a partial decay constant of 40K to 40Ar of 0.592±0.014×10-10 a−1 and a total decay constant of 5.475±0.107×10-10 a−1 (2σ), and we conclude that although omission of this decay mode can be significant for K-Ar dating, it is minor for 40Ar∕39Ar geochronology and is therefore unlikely to have significantly biased published measurements.

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