Enhancedγ-Ray Emission from Neutron Unbound States Populated inβDecay

Enhanced γ-Ray Emission from Neutron Unbound States Populated in β Decay.

Total absorption spectroscopy is used to investigate the β-decay intensity to states above the neutron separation energy followed by γ-ray emission in (87,88)Br and (94)Rb. Accurate results are obtained thanks to a careful control of systematic errors. An unexpectedly large γ intensity is observed in all three cases extending well beyond the excitation energy region where neutron penetration is...

Neutron radioactivity—Lifetime measurements of neutron-unbound states

A new technique to measure the lifetime � of a neutron-radioactive nucleus that decays in-flight via neutron emission is presented and demonstrated utilizing MonteCarlo simulations. The method is based on the production of the neutron-unbound nucleus in a target, which at the same time slows down the produced nucleus and the residual nucleus after (multi-) neutron emission. The spectrum of the ...

Simulation of Neutron and Gamma Ray Emission from Fission

X-ray emission from neutron stars in dark clusters

Two classes of neutron stars may exist in the galactic halo: neutron stars originating in the disk with high velocities and neutron stars originating in globular clusters (via Type II supernovae and/or accretion induced collapse).Moreover, the halo dark matter is likely in the form of dark clusters composed of MACHOs and cold molecular clouds. Here we propose a model in which neutron stars cros...

Low Energy X-ray Emission from Young Isolated Neutron Stars

A young neutron star with large spin-down power is expected to be closely surrounded by an e pair plasma maintained by the conversion of γ-rays associated with the star’s polar-cap and/or outer-gap accelerators. Cyclotron-resonance scattering by the e and e within several radii of such neutron stars prevents direct observations of thermal X-rays from the stellar surface. Estimates are presented...