Se p 20 08 The 3 He ( α , γ ) 7 Be S - factor at solar energies : the prompt γ experiment at LUNA
نویسندگان
چکیده
The 3He(α,γ)7Be process is a key reaction in both Big-Bang nucleosynthesis and p-p chain of Hydrogen Burning in Stars. A new measurement of the 3He(α,γ)7Be cross section has been performed at the INFN Gran Sasso underground laboratory by both the activation and the prompt γ detection methods. The present work reports full details of the prompt γ detection experiment, focusing on the determiPreprint submitted to Elsevier 30 September 2008 nation of the systematic uncertainty. The final data, including activation measurements at LUNA, are compared with the results of the last generation experiments and two different theoretical models are used to obtain the S-factor at solar energies.
منابع مشابه
Preliminary measurement of the He(α,γ)Be cross section
The current uncertainty of the He(α,γ)Be cross section greatly hinders the understanding of the high-energy solar neutrino flux from the Be(p,γ)B reaction and, thus, is significantly important in the verification of the Standard Solar Model. I present the results of my efforts this summer in assisting the group lead by Kurt Snover to prepare for a high-precision measurement of the He(α,γ)Be cro...
متن کاملJ un 1 99 3 1 Alpha scattering and capture reactions in the A = 7 system at low energies
Differential cross sections for 3 He-α scattering were measured in the energy range up to 3 MeV. These data together with other available experimental results for 3 He +α and 3 H +α scattering were analyzed in the framework of the optical model using double-folded potentials. The optical potentials obtained were used to calculate the astrophysical S-factors of the capture reactions 3 He(α, γ) 7...
متن کاملS - factor of 14 N ( p , γ ) 15 O at astrophysical energies ?
The astrophysical S(E) factor of N(p, γ)O has been measured for effective center-of-mass energies between Eeff = 119 and 367 keV at the LUNA facility using TiN solid targets and Ge detectors. The data are in good agreement with previous and recent work at overlapping energies. R-matrix analysis reveals that due to the complex level structure of O the extrapolated S(0) value is model dependent a...
متن کاملar X iv : a st ro - p h / 97 04 03 7 v 1 3 A pr 1 99 7 Prototype Test Results of the Solar Tower Atmospheric Cherenkov Effect Experiment ( STACEE )
There are currently no experiments, either satellite or ground-based, that are sensitive to astro-physical γ-rays in the energy range between 20 and 250 GeV. We are developing the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE) to explore this energy range. STACEE will use heliostat mirrors at a solar research facility to collect Cherenkov light in extensive air showers produced by...
متن کاملFirst measurement of the d ( p , γ ) 3 He cross section down to the solar Gamow peak
Using the 50 kV LUNA accelerator facility at the Gran Sasso underground laboratory we measured, with an accuracy of the order of 10%, the d(p, γ)3He cross section from 22 down to * Corresponding author. Address: Dipartimento di Fisica, via Dodecaneso 33, 16146, Genova, Italy. E-mail address: [email protected] (P. Prati). 0375-9474/02/$ – see front matter 2002 Elsevier Science B.V. All rights r...
متن کامل