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 β Decay of V61 and its Role in Cooling Accreted Neutron Star Crusts

2020 ◽  
Vol 125 (26) ◽  
Author(s):  
W.-J. Ong ◽  
E. F. Brown ◽  
J. Browne ◽  
S. Ahn ◽  
K. Childers ◽  
...  
Keyword(s):  
Neutron Star ◽  
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 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 Mass measurements of neutron rich isotopes in the Fe region and electron capture processes in neutron star crusts

2011 ◽  
Author(s):  
Alfredo Estrade ◽  
Milan Matos ◽  
Hendrik Schatz ◽  
Matthew Amthor ◽  
Mary Beard ◽  
...  
Keyword(s):  
Neutron Star ◽  
Electron Capture ◽  
Mass Measurements ◽  
Neutron Rich Isotopes

scholarly journals Testing claims of the GW170817 binary neutron star inspiral affecting β-decay rates

2020 ◽  
Vol 119 ◽  
pp. 102431 ◽  
Author(s):  
P.A. Breur ◽  
J.C.P.Y. Nobelen ◽  
L. Baudis ◽  
A. Brown ◽  
A.P. Colijn ◽  
...  
Keyword(s):  
Neutron Star ◽  
Decay Rates ◽  
Β Decay ◽  
Binary Neutron Star

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.

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