TIME REVERSAL EFFECTS IN MUON DECAY

1957 ◽  
Vol 35 (10) ◽  
pp. 1199-1203 ◽  
Author(s):  
Robert T. Sharp ◽  
Glen Bach
Keyword(s):  
Electron Spin ◽  
Time Reversal ◽  
Muon Spin ◽  
Muon Decay ◽  
Transverse Polarization ◽  
Dependent Term ◽  
Two Component ◽  
Neutrino Theory

Expressions are given for the distribution of electrons emitted in the decay of aligned muons as a function of their energy, direction, and spin. The two-component neutrino theory of Yang and Lee is used, and two cases are considered: (i) neutrino and antineutrino emitted; (ii) two neutrinos emitted. Various correlation terms arise as a result of the inclusion of electron spin. Among these is a time reversal dependent term whose presence would be evinced by asymmetry in a transverse polarization of electrons emitted at right angles to the muon spin.

scholarly journals Muon Decay

2021 ◽  
Author(s):  
Wulf Fetscher
Keyword(s):  
Time Reversal ◽  
Muon Decay ◽  
Transverse Polarization ◽  
Scalar Coupling ◽  
Precision Measurements ◽  
Upper Limits ◽  
Reversal Invariance ◽  
Decay Parameters ◽  
First Time ◽  
Decay Asymmetry

The decay of the muon has been studied at PSI with several precision measurements: The longitudinal polarization P_{\mathrm{L}}(E)PL(E) with the muon decay parameters \xi'ξ′, \xi''ξ″, the Time-Reversal Invariance (TRI) conserving transverse polarization P_{\mathrm{T_{1}}}(E)PT1(E) with the muon decay parameters \etaη, \eta''η″, the TRI violating transverse polarization P_{\mathrm{T_{2}}}(E)PT2(E), with \alpha'/Aα′/A, \beta'/Aβ′/A and the muon decay asymmetry with P_{\mu}\xiPμξ. The detailed theoretical analysis of all measurements of normal and inverse muon decay has led for the first time to a lower limit |g^{V}_{LL}| > 0.960|gLLV|>0.960 (“V-AV−A”) and upper limits for nine other possible complex couplings, especially the scalar coupling |g^{S}_{LL}| < 0.550|gLLS|<0.550 which had not been excluded before.

A PROPOSED β-DECAY INTERACTION

1957 ◽  
Vol 35 (9) ◽  
pp. 1017-1020 ◽  
Author(s):  
M. A. Preston
Keyword(s):  
Experimental Data ◽  
Time Reversal ◽  
Neutrino Emission ◽  
Β Decay ◽  
Present Experimental Data ◽  
Decay Interaction ◽  
Tensor Term ◽  
Two Component ◽  
Neutrino Theory

It is shown that one can retain the two-component neutrino theory and time reversal with scalar and tensor interactions in the β-decay Hamiltonian, if one postulates that the scalar term produces neutrino emission and the tensor term antineutrino emission. This is consistent with all present experimental data.

Electron spin resonance detection of heterogeneous reactions of Pigment Red 122

1990 ◽  
Vol 68 (4) ◽  
pp. 640-643
Author(s):  
Mary Jane Walzak ◽  
John R. Harbour
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Radical Anion ◽  
Heterogeneous Reactions ◽  
Resonance Spectroscopy ◽  
G Factor ◽  
Spin Resonance ◽  
Two Component ◽  
Induced Signal ◽  
Resonance Detection

Electron spin resonance spectroscopy (ESR) has been used to investigate the electrochemical and photolytic behaviour of particulate C.I. Pigment Red 122. Heterogeneous electrochemical reduction and oxidation of the pigment resulted in different reversible ESR signals with the radical cation giving a signal of ΔHpp = 2.3 G and g-factor of 2.0033 and the radical anion giving ΔHpp = 3.2 G and g-factor 2.0039. On exposure to light the inherent ESR signal, which was determined to be a two-component signal, increased in intensity by a factor of 2.4 but did not change in linewidth or g-factor. This light-induced signal was reversible and decayed to initial levels in the dark. The mechanism of these reactions is discussed. Keywords: ESR, pigment, electrochemistry, photo effects.

scholarly journals Isolation of EPR spectra and estimation of spin-states in two-component mixtures of paramagnets

2018 ◽  
Vol 47 (31) ◽  
pp. 10473-10479 ◽  
Author(s):  
Sonia Chabbra ◽  
David M. Smith ◽  
Bela E. Bode
Keyword(s):  
Electron Spin ◽  
Epr Spectra ◽  
Spin States ◽  
Spin Multiplicity ◽  
System P ◽  
Two Component

The isolation of component EPR spectra and identification of electron spin multiplicity is explored in an industrially relevant precatalyst system.

Pion and muon decay

1958 ◽  
Vol 246 (1247) ◽  
pp. 463-466
Keyword(s):  
Angular Distribution ◽  
Muon Spin ◽  
Muon Decay ◽  
Decay Process ◽  
Pion Decay ◽  
Decay Sequence ◽  
Spin Equation

The non-conservation of parity in pion and muon decay was discovered (Garwin, Lederman & Weinrich 1957; Friedman & Telegdi 1957) almost immediately after it had been observed in /?-decay. Experimentally it was shown that in the π - μ - e decay sequence the intensity of the final electrons had an angular distribution of the type I = A + B p μ ·p e´ where p μ (p e ) is the momentum of the muon (electron) at the point of emission. Since the muons were brought to rest between the two decay events, the connecting link could only be the muon spin. Equation (1) is thus the consequence of two separate equations, one for each decay process, pion decay σ μ = Cp μ, muon decay I = A + Dσ μ ·p e´

scholarly journals Detection of Time-Reversal Symmetry Breaking in the Noncentrosymmetric SuperconductorRe6ZrUsing Muon-Spin Spectroscopy

2014 ◽  
Vol 112 (10) ◽  
Author(s):  
R. P. Singh ◽  
A. D. Hillier ◽  
B. Mazidian ◽  
J. Quintanilla ◽  
J. F. Annett ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Time Reversal ◽  
Muon Spin ◽  
Time Reversal Symmetry ◽  
Muon Spin Spectroscopy

Polarized muon decay: Measurement of the polarization vector of the decay positrons as a test of time reversal invariance

2003 ◽  
Vol 721 ◽  
pp. C457-C460 ◽  
Author(s):  
W. Fetscher ◽  
K. Bodek ◽  
A. Budzanowski ◽  
N. Danneberg ◽  
C. Hilbes ◽  
...  
Keyword(s):  
Time Reversal ◽  
Polarization Vector ◽  
Muon Decay ◽  
Time Reversal Invariance ◽  
Reversal Invariance ◽  
Decay Measurement
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