Present status of direct ^4He(^12C,^16O)γ measurement near stellar energy at KUTL

Details Present status of direct ^4He(^12C,^16O)γ measurement near stellar energy at KUTL Present status of direct ^4He(^12C,^16O)γ measurement near stellar energy at KUTL

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..haw.bg004f&link_type=abstract

American Physical Society, 3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan, October 1

Physics

Nuclear Physics

Scientific paper

A ^12C + ^4He -> ^16O + γ reaction plays a very important role in evolution of heavy stars. The cross section is, however, still unknown in spite of more than 40 years experiment in the world because of its quite low value. We are planning to measure the cross section with the direct detection of the produced ^16O from Ecm= 2.4 down to 0.7 MeV by using a pulsed ^12C beam and a windowless ^4He gas target. Detection of ^16O is the most possible method since detection efficiency of ^16O recoils is very high. A new blow-in gas target was developed to achieve ^4He pressure of 24 Torr, and the target thickness along the beam axis was measured by p+^4He scattering. Using many movable slits installed in a recoil mass separator, backgrounds generated by the ^12C beam were eliminated effectively. Present experiment at Ecm = 1.5MeV is reported.

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