Atomic screening of nuclear transitions

Abstract

In the analysis of time-reversal and Mossbauer absorption experiments, it is important to consider atomic processes which interfere with the dllect nuclear transition. Interaction of the photon with the atomic electrons causes the radiation to acquire a phase shift,-specified by the interference parameter s(L1T). We present theoretical

Vector analyzing power in elastic electron-proton scattering

“…Uncertainties in theoretical calculations of these final state interactions would cloud the interpretation of a sufficiently precise T-odd, P-even measurement in terms of new interactions. Observations of T-odd, P-even correlations in nuclear ␥-decays are consistent with theoretical calculations of QED final state interactions [9], while T-odd, P-even searches in neutron ␤-decay have yet to reach the sensitivity needed to discern these effects. Recently, the SAMPLE Collaboration has reported a nonzero measurement of the VAP in polarized, elastic electronproton scattering [10], making it the first nonzero result for any T-odd, P-even observable in any electron scattering process.…”

Mössbauer test ofTinvariance inYb171

“…However, theoretical estimates realistically give the value ε to be in the range −3.9 × 10 −3 ε − 4.7 × 10 −3 [3]. The upper limit of the T -parity violation was found to be | η| < 10 −3 .…”

“…On the other hand, the phase determined in the Mössbauer experiments is ε E,M , the accuracy of determination being usually about 15% [3]. Therefore, neither the accuracy of the theoretical calculations of ε, nor the experimental possibilities of estimating ε from ε E,M currently permit achieving a higher than 10 −3 accuracy for the determination of the η in the emission experiments.…”

Accurate Mössbauer line-shape measurements including interference inW182,Wagoner1, Mullen2, Schupp3 1993Phys. Rev. C7010View full textAdd to dashboardCite

“…The interference parameter arises from final state interference between nuclear and inner electron shell interactions [1 -3]. Few existing interference measurements are accurate, due primarily to the use of Lorentzian line-shape approximations which fail to correctly account for finite absorber thickness and hence lead to incorrect values of P [2]. There also is a shortage of experimental confirmation of measured P values, due perhaps to the difficulty of measuring the asymmetric component of the Mossbauer line shape which is usually only a few percent of the total line-shape peak height.…”