Abstract
It is theoretically suggested that the violation of charge conjugation and parity symmetry (CP-violation) could be enhanced in several compound nuclear reactions. According to the CPT theorem the violation of time-reversal symmetry (T-violation) would be enhanced too. The experimental sensitivity to find a T-violating effect in neutron-induced compound nuclear reactions depends on the value of a spin factor κ(J), which is a parameter specific for each nuclide. It can be determined from the angular dependence of γ-ray emission in (n,γ) reactions induced near a p-wave resonance. In this paper, the measurement result and the analysis status of experiments using the target nucleus 117Sn are reported.
Highlights
Violation of charge conjugation and parity symmetry (CPviolation) stronger than expected within the Standard Model of particle physics is necessary to explain the dominance of matter over anti-matter in the current universe
According to the CPT theorem the violation of timereversal symmetry (T-violation) must be enhanced
CP-violation (T-violation) is one of the necessary conditions to explain the dominance of matter over antimatter in the current universe
Summary
Violation of charge conjugation and parity symmetry (CPviolation) stronger than expected within the Standard Model of particle physics is necessary to explain the dominance of matter over anti-matter in the current universe. It is theoretically suggested that CP-violation is enhanced in several nuclear compound reactions [1]. By measuring the spin-dependent neutron transmission asymmetry through polarized nuclear targets one can measure enhanced T-violating terms in the neutronnucleus forward scattering amplitude, providing a sensitive probe for T-violation beyond the Standard Model. It is related to neutron resonance partial widths via a mixing angle φ describing the superposition of different spin components. Where θγ is the angle between the flight directions of the emitted gamma-ray and the incident neutron. Equation (1) indicates that, due to these terms, the shape of the p-wave resonance depends on the direction of emitted γ -rays with respect to the incident neutron beam. The results of a measurement of the angular dependence of γ -ray emission near the p-wave resonance at 1.33 eV is reported
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