LLNL/Rochester 2007 TRIUMF activity

Abstract

Bambino is a first generation auxiliary detector for the TIGRESS array and consists of a pair of segmented annular silicon detectors, fabricated by MicronSemiconductor Inc. Bambino provides measures of both the energy and position for outgoing charged particles and main triggers for valid events. The annular Bambino detectors are placed 3.0 cm from the target both upstream and downstream. Each detector has 24 rings in q covering angles between 20.1{sup o} and 49.4{sup o} and between 130.6{sup o} to 159.9{sup o}, with 16 sectors in {phi} for 2{pi} coverage. Two sets of preamplifiers, manufactured by SwanResearch, with the sensitivity of either 5 or 50 mV/MeV are available for experiments. A special scattering chamber to accommodate this detector array was designed and fabricated in FY06 by U. of Rochester. Bambino functioned very well for the first successful TIGRESS experiment on the Coulomb excitation of radioactive {sup 20}Na and {sup 21}Na beams in Jul/Aug 2006. Bambino underwent a major upgrade in FY07 at a cost of about $80 k to increase the position resolution. This is achieved by doubling the number of sector to 32 and will improve the in-flight reaction product {gamma}-ray spectroscopy resolution to about 1% or better for themore » TIGRESS array. This new segmented silicon detector, called CD-S3, was designed and fabricated by MicronSemiconductor Inc. CD-S3 was installed and used for the scheduled experiment E1075 in Jul/Aug 2007 (Coulomb excitation of radioactive {sup 29}Na beam). In addition, assemble of a {Delta}E-E detector array for the light charged-particle identification is taking place for future experiments by acquiring detectors with thickness of both {approx}140 and {approx}1,000 {micro}m and associated preamplifiers.« less