Bubble Chambers for Experiments in Nuclear Astrophysics
| Autor: | Anton Tonchev, C. Ugalde, K. E. Rehm, Gencho Rusev, R. Raut, D. J. Henderson, A. Robinson, R. J. Holt, Andrew Sonnenschein, B. DiGiovine |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Physics
Nuclear reaction Nuclear and High Energy Physics Physics - Instrumentation and Detectors Orders of magnitude (temperature) Detector FOS: Physical sciences Instrumentation and Detectors (physics.ins-det) Particle detector Nuclear physics 85.05 Measuring instrument Radiative transfer Nuclear astrophysics Bubble chamber Nuclear Experiment (nucl-ex) Astrophysics - Instrumentation and Methods for Astrophysics Instrumentation and Methods for Astrophysics (astro-ph.IM) Instrumentation Nuclear Experiment |
| Popis: | A bubble chamber has been developed to be used as an active target system for low energy nuclear astrophysics experiments. Adopting ideas from dark matter detection with superheated liquids, a detector system compatible with gamma-ray beams has been developed. This detector alleviates some of the limitations encountered in standard measurements of the minute cross sections of interest to stellar environments. While the astrophysically relevant nuclear reaction processes at hydrostatic burning temperatures are dominated by radiative captures, in this experimental scheme we measure the time-reversed processes. Such photodisintegrations allow us to compute the radiative capture cross sections when transitions to excited states of the reaction products are negligible. Due to the transformation of phase space, the photodisintegration cross sections are up to two orders of magnitude higher. The main advantage of the new target-detector system is a density several orders of magnitude higher than conventional gas targets. Also, the detector is virtually insensitive to the gamma-ray beam itself, thus allowing us to detect only the products of the nuclear reaction of interest. The development and the operation as well as the advantages and disadvantages of the bubble chamber are discussed. Accepted manuscript in Nuclear Instruments and Methods in Physics Research Section A. 12 pages, 14 figures |
| Databáze: | OpenAIRE |
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