A Multiwire Proportional Chamber for Imaging Thermal, Epicadmium, and Fast Neutrons

A multiwire proportional chamber for precision studies of neutron b decay angular correlations

A new multiwire proportional chamber (MWPC) was designed and constructed for precision studies of neutron b decay angular correlations. Its design has several novel features, including the use of low pressure neopentane as the MWPC gas and an entrance window made of thin Mylar sheet reinforced with Kevlar fibers. In the initial off-line performance tests, the gas gain of neopentane and the posi...

A Position-Sensitive Ionization Chamber for Thermal Neutrons

A position-sensitive neutron detector based on He is being developed for a national crystal backscattering spectrometer (CBS) at a pulsed neutron source. It comprises a single gas volume, of constant depth, in the form of an annulus that is also part of a truncated cone. Charge from each event is collected on one or two anode strips, out of a total 336 around the annulus, yielding an angular re...

A Multiwire Proportional Chamber for Precision Studies of Neutron β Decay Angular Correlations

A new multiwire proportional chamber was designed and constructed for precision studies of neutron β decay angular correlations. Its design has several novel features, including the use of low pressure neopentane as the MWPC gas and an entrance window made of thin Mylar sheet reinforced with Kevlar fibers. In the initial offline performance tests, the gas gain of neopentane and the position res...

Multiwire proportional chambers in the HERMESexperimentA

The multiwire proportional chambers of the HERMES spectrometer are described. The chambers are located in the spectrometer magnet gap which imposed strong constraints on their design. Non-ammable gas mixture of Ar(65%), CO 2 (30%) and CF 4 (5%) is successfully used with an eeciency plateau 500V wide. The readout is performed by means of the recently developed LeCroy PCOS4 acquisition system upg...

Interlaboratory Development of an Integrated Circuit for Multiwire Proportional Chambers