1. 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
- Author
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Maria Lugaro, V. Paticchio, A. Formicola, A. Guglielmetti, László Csedreki, A. Boeltzig, Paola Marigo, T. Chillery, Zs. Fülöp, Z. Elekes, F. Ferraro, Gianluca Imbriani, L. Schiavulli, Antonio Caciolli, G. F. Ciani, K. Stöckel, V. Mossa, Sandra Zavatarelli, F. Cavanna, Oscar Straniero, M. Junker, D. Piatti, M. P. Takács, C. Gustavino, R. Perrino, Marialuisa Aliotta, Tamás Szücs, F. R. Pantaleo, C. G. Bruno, P. Corvisiero, G. D'Erasmo, Davide Trezzi, Paolo Prati, A. Di Leva, C. Broggini, R. Depalo, Gy. Gyürky, E. M. Fiore, D. Bemmerer, Laura Elisa Marcucci, Roberto Menegazzo, Thomas Davinson, A. Best, I. Kochanek, G. Gervino, Ferraro, F., Takács, M. P., Piatti, D., Mossa, V., Aliotta, M., Bemmerer, D., Best, A., Boeltzig, A., Broggini, C., Bruno, C. G., Caciolli, A., Cavanna, F., Chillery, T., Ciani, G. F., Corvisiero, P., Csedreki, L., Davinson, T., Depalo, R., D’Erasmo, G., Di Leva, A., Elekes, Z., Fiore, E. M., Formicola, A., Fülöp, Zs., Gervino, G., Guglielmetti, A., Gustavino, C., Gyürky, Gy., Imbriani, G., Junker, M., Kochanek, I., Lugaro, M., Marcucci, L. E., Marigo, P., Menegazzo, R., Pantaleo, F. R., Paticchio, V., Perrino, R., Prati, P., Schiavulli, L., Stöckel, K., Straniero, O., Szücs, T., Trezzi, D., and Zavatarelli, S.
- 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) - 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., Comment: 11 pages, 11 figures, accepted in Eur. Phys. Journal A
- Published
- 2018