Physics – Nuclear Physics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..610..446i&link_type=abstract
NUCLEAR PHYSICS IN THE 21st CENTURY:International Nuclear Physics Conference INPC 2001. AIP Conference Proceedings, Volume 610,
Physics
Nuclear Physics
Transfer Reactions, Hydrostatic Stellar Nucleosynthesis, Nuclear Reactions Involving Few-Nucleon Systems, A<=5
Scientific paper
We have measured the nuclear fusion cross section for 3He(3He,2p)4He near the solar Gamow peak with a compact accelerator facility OCEAN and with an assembly of counter telescopes with a detection efficiency of 10%. The data obtained at Ecm=45.3 to 31.2 keV improved the existing astrophysical S-factors in statistical and systematic errors. A Monte Carlo simulation program exploiting GEANTS, SRIM and GENBOD computer codes has been developed to estimate the detection efficiency for two proton coincidence with a ΔE-E telescopes. The precision of developed program has been investigated by comparing the simulated results with the experimental values for cross section of the D(3He,p)α reaction carried out by replacing the target with D gas. It turned out that the present study involves around 3% systematic errors for an estimation of the detection efficiency. The overall systematic errors for these data from 45.3 to 31.2 keV is 3.8%, that is as good as those of the previous experiments. The latest data obtained at 29.1 and 26.9 keV with large statistical and systematic errors show considerable larger S-factors than previous. An enhancement of astrophysical S-factor might be expected by the existence of a certain resonance as well as by an atomic effect on the screening potential near the solar Gamow energy. .
Ejiri Hiro
Itahashi Tatsumasa
Komori Masataka
Kudomi Nobuyuki
Nagai Yuki
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