Published 2018
| Version v1
Publication
Direct Capture Cross Section and the Ep = 71 and 105 keV Resonances in the 22Ne(p,γ)23Na Reaction
Creators
- F. Ferraro
- M. P. Takács
- D. Piatti
- F. Cavanna
- R. Depalo
- M. Aliotta
- D. Bemmerer
- A. Best
- A. Boeltzig
- C. Broggini
- C. G. Bruno
- A. Caciolli
- T. Chillery
- G. F. Ciani
- P. Corvisiero
- T. Davinson
- G. D'Erasmo
- A. Di Leva
- Z. Elekes
- E. M. Fiore
- A. Formicola
- Z. Fülöp
- G. Gervino
- A. Guglielmetti
- C. Gustavino
- G. Gyürky
- G. Imbriani
- M. Junker
- A. Karakas
- I. Kochanek
- M. Lugaro
- P. Marigo
- R. Menegazzo
- V. Mossa
- F. R. Pantaleo
- V. Paticchio
- R. Perrino
- P. Prati
- L. Schiavulli
- K. Stöckel
- O. Straniero
- T. Szücs
- D. Trezzi
- S. Zavatarelli
Contributors
Others:
- Ferraro, F.
- Takács, M. P.
- Piatti, D.
- Cavanna, F.
- Depalo, R.
- Aliotta, M.
- Bemmerer, D.
- Best, A.
- Boeltzig, A.
- Broggini, C.
- Bruno, C. G.
- Caciolli, A.
- Chillery, T.
- Ciani, G. F.
- Corvisiero, P.
- Davinson, T.
- D'Erasmo, G.
- Di Leva, A.
- Elekes, Z.
- Fiore, E. M.
- Formicola, A.
- Fülöp, Z.
- Gervino, G.
- Guglielmetti, A.
- Gustavino, C.
- Gyürky, G.
- Imbriani, G.
- Junker, M.
- Karakas, A.
- Kochanek, I.
- Lugaro, M.
- Marigo, P.
- Menegazzo, R.
- Mossa, V.
- Pantaleo, F. R.
- Paticchio, V.
- Perrino, R.
- Prati, P.
- Schiavulli, L.
- Stöckel, K.
- Straniero, O.
- Szücs, T.
- Trezzi, D.
- Zavatarelli, S.
Description
The 22Ne(p,γ)23Na reaction, part of the neon-sodium cycle of hydrogen burning, may explain the
observed anticorrelation between sodium and oxygen abundances in globular cluster stars. Its rate is
controlled by a number of low-energy resonances and a slowly varying nonresonant component. Three new
resonances at Ep = 156.2, 189.5, and 259.7 keV have recently been observed and confirmed. However,
significant uncertainty on the reaction rate remains due to the nonresonant process and to two suggested
resonances at Ep = 71 and 105 keV. Here, new 22Ne(p,γ)23Na data with high statistics and low
background are reported. Stringent upper limits of 6 × 10−11 and 7 × 10−11 eV (90% confidence level),
respectively, are placed on the two suggested resonances. In addition, the off-resonant S factor has been
measured at unprecedented low energy, constraining the contributions from a subthreshold resonance and
the direct capture process. As a result, at a temperature of 0.1 GK the error bar of the 22Ne(p,γ)23Na rate is
now reduced by 3 orders of magnitude
Additional details
Identifiers
- URL
- http://hdl.handle.net/11567/928987
- URN
- urn:oai:iris.unige.it:11567/928987
Origin repository
- Origin repository
- UNIGE