Annihilation signatures of neutron dark decay models in neutron oscillation and proton decay searches

The Beta-, Neutrino- and Proton-Asymmetry in Neutron β-Decay

This article describes measurements of angular-correlation coefficients in the decay of free neutrons with the superconducting spectrometer PERKEO II. A method for measuring the β-asymmetry coefficient A is presented, as well as a new method for determining the neutrino-asymmetry coefficient B, which allows a value for the proton-asymmetry coefficient C to be obtained for the first time. An ong...

PANDA Precision Measurement of the Proton Asymmetry in Neutron Decay

Neutron and proton spectra from the decay of Λ hypernuclei

We have determined the spectra of neutrons and protons following the decay of Λ hypernuclei through the oneand two-nucleon induced mechanisms. The momentum distributions of the primary nucleons are calculated and a Monte Carlo simulation is used to account for final state interactions. From the spectra we calculate the number of neutrons (Nn) and protons (Np) per Λ decay and show how the measur...

Precision Neutron Polarimetry for Neutron Beta Decay

The abBA collaboration is developing a new type of field-expansion spectrometer for a measurement of the three correlation coefficients a, A, and B and the shape parameter b. The measurement of A and B requires precision neutron polarimetry. We will polarize a pulsed cold neutron beam from the SNS using a (3)He neutron spin filter. The well-known polarizing cross section for n-(3)He has a 1/v d...

Erratum: Neutron and proton spectra from the decay

An error in the computer program which evaluated nucleon spectra following the decay of Λ hypernuclei has been detected. The error affected the final state interaction (FSI) of the nucleons, reducing by a factor ten the nucleon-nucleon (NN) collision probability. When correcting the error, some results and conclusions of Ref. [1] have changed substantially. In this erratum we present the correc...