Observation of the Astrophysically Important 3^+ State in ^18Ne via ^17F(p,p) with a Radioactive ^17F Beam

Details Observation of the Astrophysically Important 3^+ State in ^18Ne via ^17F(p,p) with a Radioactive ^17F Beam Observation of the Astrophysically Important 3^+ State in ^18Ne via ^17F(p,p) with a Radioactive ^17F Beam

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..dnp..da03s&link_type=abstract

American Physical Society, Division of Nuclear Physics Meeting, October 20-23, 1999 Pacific Grove, CA, abstract #DA.03

Physics

Nuclear Physics

Scientific paper

The ^17F(p,γ)^18Ne reaction is important in stellar explosions such as novae and X-ray bursters, but its rate has been uncertain (by up to a factor of 100) because of an expected 3^+ state in ^18Ne that has never been conclusively observed despite nine previous experimental studies of the relevant excitation energy region. This state would provide a strong l = 0 resonance in ^17F + p capture and, depending on its excitation energy, could dominate the ^17F(p,γ)^18Ne stellar reaction rate. We have observed( D. W. Bardayan, J. C. Blackmon, C. R. Brune, A. E. Champagne, A. A. Chen, J. M. Cox, T. Davinson, V. Y. Hansper, M. A. Hofstee, B. A. Johnson, R. L. Kozub, Z. Ma, P. D. Parker, D. E. Pierce, M. T. Rabban, A. C. Shotter, M. S. Smith, K. B. Swartz, D. W. Visser, and P. J. Woods, Phys. Rev. Lett. 83) (1999) 45. this missing 3^+ state by measuring the ^1H(^17F,p)^17F excitation function with a radioactive ^17F beam produced with the isotope separator on-line (ISOL) technique at ORNL's Holifield Radioactive Ion Beam Facility. We find that the state lies at a center-of-mass energy of Er = 599.8 ± 1.5_stat ± 2.0_sys keV (Ex = 4523.7 ± 2.9 keV) and has a width of Γ = 18 ± 2_stat ± 1_sys keV. Our measurement significantly reduces the uncertainty in the reaction rate, and shows that the 3^+ resonance dominates the capture rate at temperatures above 0.5 GK while the non-resonant direct capture dominates at lower temperatures.

Affiliated with

Also associated with

No associations

Rating

Observation of the Astrophysically Important 3^+ State in ^18Ne via ^17F(p,p) with a Radioactive ^17F Beam 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 Observation of the Astrophysically Important 3^+ State in ^18Ne via ^17F(p,p) with a Radioactive ^17F Beam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observation of the Astrophysically Important 3^+ State in ^18Ne via ^17F(p,p) with a Radioactive ^17F Beam will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1084178