^18O(p,γ)^19F resonance strength measurement at low energies

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Scientific paper

As a 0.4M <= M <= 8M approaches the end of its stellar evolution, it will enter the asymptotic giant branch (AGB) stage and ascend the giant branch one final time. During the AGB stage, a star experiences significant mass loss, and grain condensation occurs in the stellar atmosphere. A subset of presolar oxide grains recovered from comet and meteorite samples can be attributed to this stellar environment; these grains feature ^18O depletion that cannot be explained by existing AGB stellar models. An extra mixing process referred to as ``cool bottom processing" (CBP) was proposed by Wasserburg et al. (1995) for low-mass AGB stars. The ^18O depletion observed in these presolar grains may result from the ^18O+p process during CBP. A low energy, unobserved, narrow resonance exists within the (p,γ) reaction that may affect thermonuclear reaction rates near the CBP temperature regime. Though the ER^lab = 95 keV resonance strength (φγ) has been constrained previously, measurements at the Laboratory for Experimental Nuclear Astrophysics (LENA) have improved the resonance strength upper limit. The effect this improvement has on ^18O(p,γ)^19F thermonuclear reaction rates will be discussed.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

^18O(p,γ)^19F resonance strength measurement at low energies 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 ^18O(p,γ)^19F resonance strength measurement at low energies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ^18O(p,γ)^19F resonance strength measurement at low energies will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1370422

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.