The weak neutral current in the nucleon-nucleon interaction

The search for the weak neutral currents in the nucleon-nucleon-interaction was performed using reactions of polarised cold neutrons with light nuclei. P-odd asymmetries were investigated in the reactions ⁶Li(n,a)T and ¹⁰B(n,α)⁷Li^* → ⁷Li+γ, using a multi-section ionisation chamber and large scintillation crystals, respectively. These detectors, an integral method to detect the events, and the most intense neutron beam in the world, allowed us to measure the asymmetries with a record sensitivity of about 4.10^-8.

Ref.: V.A. Vesna et al, Phys. Rev. C 77, 035501 (2008).