Auxilliary Detectors

The following ancillary detectors are available at WNSL for use with YRAST Ball or in other target areas.

BGO hex array

This is an array of 38 hexagonal BGO elements, generally packed into two halves to cover hemispheres around the beam line at the target position. It can be used in this manner as a sum-energy/multiplicity filter, allowing a reasonable degree of channel selection.

Alternatively it can be rearranged so as to surround the beamline at some distance after the target, in order to be used as a detector for short-lived isomers, or placed at the primary target position as an RNB production trigger.

Neutron detectors

More than 12 NE213 scintillation counters are available for use at WNSL. Neutron-gamma discrimination can be achieved with pulse-shape discrimination and time-of-flight measurements - in the latter case, the prompt signal can be defined as a prompt gamma ray detected in the BGO hex array. These detectors can be used either simply as a neutron veto (to emphasize those channels populated only via charge particle emission) or to select a neutron-emitting channel.

LEPS detectors

Four low energy photon detectors are available for use with YRASTball, and can be placed in the support rings in place of the normal 25% Ge detectors. The sensitivity of these detectors to low energy gamma rays and X-rays is very useful for the study of heavy nuclei (such as the actinides) and for the identification of products in fission or deep-inelastic scattering reactions.

It is also possible to use the NYPD plunger device in YRAST Ball, possibly in combination with SCARY or other ancillary detectors.

[Nuclear Structure] [WNSL] [Physics Department] [Yale University]

Last modified 2 October 2000
Send comments to the WNSL Webmaster.