An empirical equation for the backscattering coefficient of electrons

Tabata, Tatsuo; Ito, Rinsuke; Okabe, S.

doi:10.1016/0029-554x(71)90013-9

Cited by 133 publications

(41 citation statements)

References 24 publications

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“…A Si detector of this thickness is able to fully stop electrons with energies up to ∼350 keV, while at the same time having a rather low sensitivity to γ radiation in comparison to a thicker Si detector or a highpurity Ge detector. Another advantage of using a Si detector is that the electron backscattering probability for Si is significantly lower than for Ge (by a factor of about 2.3 [46]). …”

Section: A Experimental Setupmentioning

confidence: 99%

Precision measurements of theCo60β-asymmetry parameter in search for tensor currents in weak interactions

et al. 2010

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The β-asymmetry parameter A for the Gamow-Teller decay of 60 Co was measured by polarizing the radioactive nuclei with the brute force low-temperature nuclear-orientation method. The 60 Co activity was cooled down to milliKelvin temperatures in a 3 He-4 He dilution refrigerator in an external 13 T magnetic field. The β particles were observed by a 500 µm thick Si PIN diode operating at a temperature of about 10 K in a magnetic field of 0.6 T. Extensive GEANT4 Monte-Carlo simulations were performed to gain control over the systematic effects. Our result, A = −1.014 (12)stat (16)syst, is in agreement with the Standard-Model value of −0.987(9), which includes recoil-order corrections that were addressed for the first time for this isotope. Further, it enables limits to be placed on possible tensor-type charged weak currents as well as other physics beyond the Standard Model.

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Section: A Experimental Setupmentioning

confidence: 99%

Precision measurements of theCo60β-asymmetry parameter in search for tensor currents in weak interactions

et al. 2010

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“…(29) (for the energy dependence) and Ref. (31) (for the angular dependence) by a factor of approximately 1.2.…”

Section: Electrons Backscattering Simulationsmentioning

confidence: 99%

A GEANT4 Monte-Carlo simulation code for precision spectroscopy

Wauters

Kraev

Zákoucký

et al. 2009

Nuclear Instruments and Methods in Physics Research Section A:

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The measurement of the β asymmetry parameter in nuclear β decay is a potentially very sensitive tool to search for non V − A components in the charge-changing weak interaction. To reach the required precision (percent level) all effects that modify the emission pattern of the β radiation, i.e. the geometry of the setup, the effect of the magnetic field on the trajectories of β particles as well as (back)scattering in the source, on the sample holder and on the detector, have to be correctly taken into account in the analysis of the data. A thorough study of these effects and a new method based on detailed GEANT4 Monte-Carlo simulations that was developed for this purpose is presented here. The code was developed for β asymmetry measurements by means of the Low Temperature Nuclear Orientation (LTNO) method, but can in principle be generalized to other experimental setups using other polarization techniques.

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“…These results are consistent with each other at less than 0.5% precision. As a cross-check to these simulations, a phenomenological model was also used to parametrize electron backscattering which was derived from electron backscattering studies on plastic scintillators [45,46] and modified to match the results of Martin et al [47].…”

Section: Electron Backscatteringmentioning

confidence: 99%

Radiativeβdecay of the free neutron

et al. 2010

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The theory of quantum electrodynamics predicts that the β decay of the neutron into a proton, electron, and antineutrino is accompanied by a continuous spectrum of emitted photons described as inner bremsstrahlung. While this phenomenon has been observed in nuclear β decay and electron-capture decay for many years, it has only been recently observed in free-neutron decay. We present a detailed discussion of an experiment in which the radiative decay mode of the free neutron was observed. In this experiment, the branching ratio for this rare decay was determined by recording photons that were correlated with both the electron and proton emitted in neutron decay. We determined the branching ratio for photons with energy between 15 and 340 keV to be (3.09 ± 0.32) × 10 −3 (68% level of confidence), where the uncertainty is dominated by systematic effects. This value for the branching ratio is consistent with theoretical predictions. The characteristic energy spectrum of the radiated photons, which differs from the uncorrelated background spectrum, is also consistent with the theoretical spectrum.

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An empirical equation for the backscattering coefficient of electrons

Cited by 133 publications

References 24 publications

Precision measurements of theCo60β-asymmetry parameter in search for tensor currents in weak interactions

Precision measurements of theCo60β-asymmetry parameter in search for tensor currents in weak interactions

A GEANT4 Monte-Carlo simulation code for precision spectroscopy

Radiativeβdecay of the free neutron

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