Limits of time-reversal violating interaction from compound nuclear experiments

Abstract

Mean square matrix elements of the time reversal invariance violating (TRIV) interaction between the compound nuclear states are calculated within the statistical model, using the explicit form of the TRIV interaction via the ρmeson exchange. From the comparison of the calculated values with the data known for p + 27 Al ⇔ 24 M g + α reaction, and for γ-correlation measurements in 113 Cd(n, γ) 114 Cd process, the bounds on the TRIV constant are obtained g ρ < ∼ 1.8 × 10 −2 andḡ ρ < ∼ 1.1 × 10 −2 . The sensitivity of the recently proposed detailed balance test experiments on isolated resonances in 32 S to the value ofḡ ρ is shown to be as high as to reach valuesḡ ρ ∼ 10 −4 .

Constraints on Parity-Even Time Reversal Violation in the Nucleon-Nucleon System and Its Connection to Charge Symmetry Breaking

“…This ineffectiveness, emphasized already in Ref. [15] has recently been verified also for processes in heavy nuclei governed by the statistical model [3,4], for which high sensitivity has long been claimed, as well as in other calculations [5,7,8].…”

“…The final limit |ḡ ρ | ≤ 6.7 × 10 −3 , 95% CL (12) (|ḡ ρ | ≤ 4.4 × 10 −3 , 80% CL) is obtained from the weighted average of the three values for g ρ extracted from the three CSB measurements in Table I. This limit is considerably lower than those obtained so far from the analysis of nuclear processes [3][4][5][6][7]. It is also slightly better than the constraints obtained from atomic electric dipole moments (EDM's) [3,4].…”

“…Investigations of time-reversal violation (TRV) orders of magnitude above the weak interaction scale and thus necessarily of non-weak origin continue to enjoy popularity in nuclear and nucleon-nucleon physics [1][2][3][4][5][6][7][8].…”