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Ultra-sensitive in-beam \gamma -ray spectroscopy for nuclear astrophysics at LUNA

Authors:	A Caciolli L Agostino D Bemmerer R Bonetti C Broggini F Confortola P Corvisiero H Costantini Z Elekes A Formicola Zs Fül?p G Gervino A Guglielmetti C Gustavino Gy Gyürky G Imbriani M Junker M Laubenstein A Lemut B Limata M Marta C Mazzocchi R Menegazzo P Prati V Roca C Rolfs C Rossi Alvarez E Somorjai O Straniero F Strieder F Terrasi H P Trautvetter

Institution:	1. INFN, Sezione di Padova, Padova, Italy 2. Dipartimento di Fisica, Università di Padova, Padova, Italy 3. Dipartimento di Fisica, Università di Genova and INFN Sezione di Genova, Genova, Italy 4. Forschungszentrum Dresden-Rossendorf, Dresden, Germany 5. Istituto di Fisica Generale Applicata, Università di Milano and INFN Sezione di Milano, Milano, Italy 6. ATOMKI, Debrecen, Hungary 7. INFN, Laboratori Nazionali del Gran Sasso, Assergi, Italy 8. Dipartimento di Fisica Sperimentale, Università di Torino and INFN Sezione di Torino, Torino, Italy 13. INFN, Sezione di Napoli, Napoli, Italy 9. Dipartimento di Scienze Fisiche, Università di Napoli “Federico II”, Napoli, Italy 10. Institut für Experimentalphysik III, Ruhr-Universit?t Bochum, Bochum, Germany 11. Osservatorio Astronomico di Collurania, Teramo, Italy 12. Seconda Università di Napoli, Caserta, Italy

Abstract:	Ultra-sensitive in-beam $\gamma$ -ray spectroscopy studies for nuclear astrophysics are performed at the LUNA (Laboratory for Underground Nuclear Astrophysics) 400 kV accelerator, deep underground in Italy’s Gran Sasso laboratory. By virtue of a specially constructed passive shield, the laboratory $\gamma$ -ray background for $\ensuremath E_{\gamma}$ < 3 MeV at LUNA has been reduced to levels comparable to those experienced in dedicated offline underground $\gamma$ -counting setups. The $\gamma$ -ray background induced by an incident $\alpha$ -beam has been studied. The data are used to evaluate the feasibility of sensitive in-beam experiments at LUNA and, by extension, at similar proposed facilities.

Keywords:	PACS" target="_blank">PACS 25 40 Lw Radiative capture 25 55 -e ³H - ³He - and ⁴He -induced reactions 29 20 Ba Electrostatic accelerators 29 30 Kv X- and $\gamma$ -ray spectroscopy" target="_blank">gif" alt="$ \gamma$" align="middle" border="0"> -ray spectroscopy
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