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A high-efficiency gas target setup for underground experiments, and redetermination of the branching ratio of the 189.5 keV 22Ne(p, γ)23Na resonance
- Publication Year :
- 2018
- Publisher :
- Springer New York LLC, 2018.
-
Abstract
- The experimental study of nuclear reactions of astrophysical interest is greatly facilitated by a low-background, high-luminosity setup. The Laboratory for Underground Nuclear Astrophysics (LUNA) 400 kV accelerator offers ultra-low cosmic-ray induced background due to its location deep underground in the Gran Sasso National Laboratory (INFN-LNGS), Italy, and high intensity, 250-500 $\mu$A, proton and $\alpha$ ion beams. In order to fully exploit these features, a high-purity, recirculating gas target system for isotopically enriched gases is coupled to a high-efficiency, six-fold optically segmented bismuth germanate (BGO) $\gamma$-ray detector. The beam intensity is measured with a beam calorimeter with constant temperature gradient. Pressure and temperature measurements have been carried out at several positions along the beam path, and the resultant gas density profile has been determined. Calibrated $\gamma$-intensity standards and the well-known $E_p$ = 278 keV $\mathrm{^{14}N(p,\gamma)^{15}O}$ resonance were used to determine the $\gamma$-ray detection efficiency and to validate the simulation of the target and detector setup. As an example, the recently measured resonance at $E_p$ = 189.5 keV in the $^{22}$Ne(p,$\gamma$)$^{23}$Na reaction has been investigated with high statistics, and the $\gamma$-decay branching ratios of the resonance have been determined.<br />Comment: 11 pages, 11 figures, accepted in Eur. Phys. Journal A
- Subjects :
- Nuclear reaction
Nuclear and High Energy Physics
Physics::Instrumentation and Detectors
Astrophysics::High Energy Astrophysical Phenomena
01 natural sciences
Temperature measurement
Bismuth germanate
Ion
Nuclear physics
chemistry.chemical_compound
0103 physical sciences
undeground
Nuclear astrophysics
Nuclear fusion
low energy accelerators
010306 general physics
Nuclear Experiment
detectors
Physics
010308 nuclear & particles physics
Branching fraction
chemistry
nuclear atrophysics
nuclear atrophysics, undeground, detectors, low energy accelerators
Astrophysics - Instrumentation and Methods for Astrophysics
Beam (structure)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....536e0d6c3c24e845be13d1f00edc3071