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A new study of the 22Ne(p, γ)23Na reaction deep underground: Feasibility, setup and first observation of the 186 keV resonance

  • LUNA Collaboration
  • F. Cavanna
  • R. Depalo
  • M. -L. Menzel
  • M. Aliotta
  • M. Anders
  • D. BemmererEmail author
  • C. Broggini
  • C. G. Bruno
  • A. Caciolli
  • P. Corvisiero
  • T. Davinson
  • A. di Leva
  • Z. Elekes
  • F. Ferraro
  • A. Formicola
  • Zs. Fülöp
  • G. Gervino
  • A. Guglielmetti
  • C. Gustavino
  • Gy. Gyürky
  • G. Imbriani
  • M. Junker
  • R. Menegazzo
  • P. Prati
  • C. Rossi Alvarez
  • D. A. Scott
  • E. Somorjai
  • O. Straniero
  • F. Strieder
  • T. Szücs
  • D. Trezzi
Regular Article - Experimental Physics

Abstract

The 22Ne(p,γ)23Na reaction takes part in the neon-sodium cycle of hydrogen burning. This cycle is active in asymptotic giant branch stars as well as in novae and contributes to the nucleosythesis of neon and sodium isotopes. In order to reduce the uncertainties in the predicted nucleosynthesis yields, new experimental efforts to measure the 22Ne(p,γ)23Na cross section directly at the astrophysically relevant energies are needed. In the present work, a feasibility study for a 22Ne(p,γ)23Na experiment at the Laboratory for Underground Nuclear Astrophysics (LUNA) 400 kV accelerator deep underground in the Gran Sasso laboratory, Italy, is reported. The ion-beam-induced γ-ray background has been studied. The feasibility study led to the first observation of the E p=186 keV resonance in a direct experiment. An experimental lower limit of 0.12 × 10−6 eV has been obtained for the resonance strength. Informed by the feasibility study, a dedicated experimental setup for the 22Ne(p,γ)23Na experiment has been developed. The new setup has been characterized by a study of the temperature and pressure profiles. The beam heating effect that reduces the effective neon gas density due to the heating by the incident proton beam has been studied using the resonance scan technique, and the size of this effect has been determined for a neon gas target.

Keywords

HPGe Detector Asymptotic Giant Branch Target Chamber Beam Heating Resonance Strength 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • LUNA Collaboration
  • F. Cavanna
    • 1
  • R. Depalo
    • 2
    • 3
  • M. -L. Menzel
    • 4
    • 5
  • M. Aliotta
    • 6
  • M. Anders
    • 4
    • 5
  • D. Bemmerer
    • 4
    Email author
  • C. Broggini
    • 2
  • C. G. Bruno
    • 6
  • A. Caciolli
    • 3
    • 2
  • P. Corvisiero
    • 1
  • T. Davinson
    • 6
  • A. di Leva
    • 7
  • Z. Elekes
    • 8
  • F. Ferraro
    • 1
  • A. Formicola
    • 9
  • Zs. Fülöp
    • 8
  • G. Gervino
    • 10
  • A. Guglielmetti
    • 11
  • C. Gustavino
    • 12
  • Gy. Gyürky
    • 8
  • G. Imbriani
    • 7
  • M. Junker
    • 9
  • R. Menegazzo
    • 2
  • P. Prati
    • 1
  • C. Rossi Alvarez
    • 2
  • D. A. Scott
    • 6
  • E. Somorjai
    • 8
  • O. Straniero
    • 13
    • 14
  • F. Strieder
    • 15
  • T. Szücs
    • 4
  • D. Trezzi
    • 11
  1. 1.Dipartimento di FisicaUniversità di Genova, and INFN, Sezione di GenovaGenovaItaly
  2. 2.Sezione di PadovaINFNPadovaItaly
  3. 3.Dipartimento di Fisica e AstronomiaUniversità di PadovaPadovaItaly
  4. 4.Helmholtz-Zentrum Dresden-Rossendorf (HZDR)DresdenGermany
  5. 5.Technische Universität DresdenDresdenGermany
  6. 6.SUPA, School of Physics and AstronomyUniversity of EdinburghEdinburghUK
  7. 7.Dipartimento di FisicaUniversità degli Studi di Napoli Federico II, and INFN, Sezione di NapoliNapoliItaly
  8. 8.Institute of Nuclear Research of the Hungarian Academy of Sciences (MTA ATOMKI)DebrecenHungary
  9. 9.Laboratori Nazionali del Gran SassoINFNAssergiItaly
  10. 10.Dipartimento di Fisica SperimentaleUniversità di Torino, and INFN, Sezione di TorinoTorinoItaly
  11. 11.Università degli Studi di Milano, and INFN, Sezione di MilanoMilanoItaly
  12. 12.Sezione di Roma “La Sapienza”INFNRomaItaly
  13. 13.Osservatorio Astronomico di ColluraniaTeramoItaly
  14. 14.Sezione di NapoliINFNNapoliItaly
  15. 15.Ruhr-Universität BochumBochumGermany

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