High sensitivity of a future search for P-odd/T-odd interactions on the 0.75 eV $p$-wave resonance in $\vec{n}{+}^{139}\overrightarrow{\mathrm{La}}$ forward transmission determined using pulsed neutron beam

Abstract

Neutron transmission experiments can offer a new type of highly sensitive search for time-reversal invariance violating (TRIV) effects in nucleon-nucleon interactions via the same enhancement mechanism observed for large parity violating (PV) effects in neutron-induced compound nuclear processes. In these compound processes, the TRIV cross-section is given as the product of the PV cross-section, a spin-factor $\kappa$, and a ratio of TRIV and PV matrix elements. We determined $\kappa$ to be $0.59\pm 0.05$ for ${}^{139}$La+$n$ using both $(n,\gamma )$ spectroscopy and ($\vec{n}{+}^{139}\overrightarrow{\mathrm{La}}$) transmission. This result quantifies for the first time the high sensitivity of the ${}^{139}$La 0.75~eV $p$-wave resonance in a future search for P-odd/T-odd interactions in ($\vec{n}{+}^{139}\overrightarrow{\mathrm{La}}$) forward transmission.

References in corpus (11)

• Measurement of the permanent electric dipole moment of the neutron
• Reduced Limit on the Permanent Electric Dipole Moment of ${}^{199}$Hg
• P,T-Violating Nuclear Matrix Elements in the One-Meson Exchange Approximation
• First Observation of $P$-odd $\gamma$ Asymmetry in Polarized Neutron Capture on Hydrogen
• Angular Distribution of $\gamma$-rays from Neutron-Induced Compound States of ${}^{140}$La
• On the Search for Time Reversal Invariance Violation in Neutron Transmission
• Transverse asymmetry of $\gamma$ rays from neutron-induced compound states of ${}^{140}\mathrm{La}$
• Parity violation in low energy neutron deuteron scattering
• Time reversal invariance violation in neutron-nucleus scattering
• Nuclear spin dependence of time reversal invariance violating effects in neutron scattering
• Neutron spin dynamics in polarized targets