Physics – Nuclear Physics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..dnp..bd04c&link_type=abstract
American Physical Society, Division of Nuclear Physics Meeting, October 20-23, 1999 Pacific Grove, CA, abstract #BD.04
Physics
Nuclear Physics
Scientific paper
At the TRIUMF TISOL facility in Vanvouver, we are performing a study of the feasibility of using the β-delayed 3-body decay of ^17Ne to constrain the E2 component of the ^12C + α arrow ^16O + γ reaction rate in stellar environment. The relative rate of this reaction to that of 3α arrow ^12C + γ is known to strongly affect the evolution of massive stars subsequent to the helium-burning phase. The usefulness of the cascade decay of ^17Ne in this study hinges on the existence of α-particle unbound states of ^16O in the decay chain. In order to study such decay channels, a proton, an α-particle, and a recoiling ^12C need to be observed in triple coincidence so as to constrain the kinematics. In 1996, we succeeded in identifying the breakup of the isobaric analogue state in ^17F at 11.193 MeV into three particles via three channels, viz., the 9.59 MeV (J^π=1^-) state in ^16O, and the first and second excited states in ^13N. In two subsequent experiments, various techniques have been incorporated to improve background suppression. The experimental setups will be described and the results discussed. Ultimately, we hope to use the intense radioactive ion beam available at ISAC, and this decay, to constrain the E2 component of the reaction.
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