The Astrophysically Important 3+ State in 18Ne and the 17F(p,g)18Ne Stellar Rate
Knowledge of the {sup 17}F(p,y){sup 18}Ne reaction rate is important for understanding stellar explosions, but it was uncertain because the properties of an expected but previously unobserved 3{sup +} state in {sup 18}Ne were not known. This state would provide a strong s-wave resonance for the {sup 17}F+p system and, depending on its excitation energy, could dominate the stellar reaction rate at temperatures above 0.2 GK. We have observed this missing 3{sup +} state by measuring the {sup 1}H({sup 17}F,p){sup 17}F excitation function with a radioactive {sup 17}F beam at the ORNL Holifield Radioactive Ion Beam Facility (HRIBF). We find that the state lies at a center-of-mass energy of E{sub r} = 599.8 {+-} 1.5{sub stat} {+-} 2.0{sub sys} keV (E{sub x} = 4523.7 {+-} 2.9 keV) and has a width of {Lambda} = 18 {+-} 2{sub stat} {+-} 1{sub sys} keV. The measured properties of the resonance are only consistent with a J{sup {pi}} = 3{sup +} assignment.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 829443
- Report Number(s):
- P00-107747; PRVCAN; TRN: US200610%%840
- Journal Information:
- Physical Review, C (Nuclear Physics), Vol. 62, Issue 5; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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