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

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arxiv 2312.06115 v1 pith:D7M3TY2E submitted 2023-12-11 nucl-ex hep-ex

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

classification nucl-ex hep-ex
keywords transmissioninteractionssearchtrivcompoundcross-sectiondeterminedeffects
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 $0.59\pm0.05$ for $^{139}$La+$n$ using both $(n, \gamma)$ spectroscopy and ($\vec{n}+^{139}\vec{\rm La}$) 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 ($\vec{n}+^{139}\vec{\rm La}$) forward transmission.

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