Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1012..305p&link_type=abstract
FRONTIERS IN NUCLEAR STRUCTURE, ASTROPHYSICS, AND REACTIONS: FINUSTAR 2. AIP Conference Proceedings, Volume 1012, pp. 305-312 (
Astronomy and Astrophysics
Astrophysics
1
Stellar Hydrogen Burning, Stellar Helium Burning, Fission Reactors
Scientific paper
The talk will be mainly devoted to the measurement of the cross section of the 3He(α,γ)7Be reaction which belongs to the p-p chain. Actually, solar neutrino fluxes depend both on astrophysical and on nuclear physics inputs, namely on the cross sections of the reactions responsible for neutrino production inside the Solar core. While the flux of solar 8B neutrinos has been recently measured at Superkamiokande with a 3.5% uncertainty and a precise measurement of 7Be neutrino flux is foreseen in the next future, the predicted fluxes are still affected by larger errors. The largest nuclear physics uncertainty to determine the fluxes of 8B and 7Be neutrinos comes from the 3He(α,γ)7Be reaction. The uncertainty on its S-factor is due to an average discrepancy in results obtained using two different experimental approaches: the detection of the delayed γ rays from 7Be decay and the measurement of the prompt γ emission. The LUNA Collaboration has performed a new high precision experiment with both techniques at the same time. Thanks to the low background conditions of the Gran Sasso LUNA accelerator facility, the cross section has been measured down to 93 keV, the lowest interaction energy ever reached. The S-factors from the two methods do not show any discrepancy within the experimental errors. An extrapolated S(0) = 0.560+/-0.017 keV barn is obtained. Moreover, branching ratios between the two prompt γ -transitions have been measured with 3-8% accuracy. Recently, the LUNA Collaboration has presented to the Scientific Board of Gran Sasso Laboratory its experimental program for the next five years based on the existing 400 kV accelerator facility. A Letter of Intent addressing the possibility to install a 3 MV machine at Gran Sasso has also been submitted to the Board. The LUNA scientific programs with both the 400 kV and 3 MV accelerator facilities will be illustrated in the final part of the talk.
Alvarez Rossi C.
Bemmerer Daniel
Bonetti Roberto
Broggini Carlo
Confortola Fulvia
No associations
LandOfFree
Nuclear Astrophysics At LUNA: Status And Perspectives does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Nuclear Astrophysics At LUNA: Status And Perspectives, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nuclear Astrophysics At LUNA: Status And Perspectives will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1406152