Observation of the Astrophysically Important 3[sup +] State in N[number sign]18e via Elastic Scattering of a Radioactive F[number sign]17 Beam from H[number sign]1
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
- A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511 (United States)
- Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599 (United States)
- Physics Department, Tennessee Technological University, Cookeville, Tennessee 38505 (United States)
- Department of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom)
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401 (United States)
- Chinese Institute for Atomic Energy, Beijing, 102413, People's Repub
The [sup 17]F( p,thinsp[gamma])[sup 18]Ne reaction is important in stellar explosions, but its rate has been uncertain because of an expected 3[sup +] state in [sup 18]Ne that has never been conclusively observed. This state would provide a strong [ell]=0 resonance and, depending on its excitation energy, could dominate the stellar reaction rate. We have observed this missing 3[sup +] state by measuring the [sup 1]H( [sup 17]F,thinspp) [sup 17]F excitation function with a radioactive [sup 17]F beam at the ORNL Holifield Radioactive Ion Beam Facility. We find that the state lies at a center-of-mass energy of E[sub r]=599.8[plus minus]1 .5[sub stat][plus minus]2.0[sub sys] keV (E[sub x]=4523.7[plus minus] 2.9 keV) and has a width of [Gamma]=18[plus minus]2[sub stat][plus minus]1[sub sys] keV . [copyright] [ital 1999] [ital The American Physical Society]
- DOE Contract Number:
- AC05-96OR22464; FG02-91ER40609
- OSTI ID:
- 6469840
- Journal Information:
- Physical Review Letters, Vol. 83:1; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC X-RAY BURSTS
ELASTIC SCATTERING
FLUORINE
FLUORINE 17
NEON
NEON 18
NOVAE
PROTON REACTIONS
STELLAR ACTIVITY
SUPERNOVAE
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
COSMIC RADIATION
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
ELEMENTS
ERUPTIVE VARIABLE STARS
EVEN-EVEN NUCLEI
FLUIDS
FLUORINE ISOTOPES
GASES
HADRON REACTIONS
HALOGENS
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
MINUTES LIVING RADIOISOTOPES
NEON ISOTOPES
NONMETALS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-EVEN NUCLEI
PRIMARY COSMIC RADIATION
RADIATIONS
RADIOISOTOPES
RARE GASES
SCATTERING
SECONDS LIVING RADIOISOTOPES
STARS
VARIABLE STARS
663430* - Nucleon-Induced Reactions & Scattering- (1992-)
661300 - Other Aspects of Physical Science- (1992-)