The Astrophysically Important 3⁺ State in ¹⁸Ne and the ¹⁷F(p,g)^{18Ne Stellar Rate}

Journal Article · Wed Nov 01 04:00:00 EST 2000 · Physical Review, C (Nuclear Physics)

DOI:https://doi.org/10.1103/PhysRevC.62.055804· OSTI ID:829443

Bardayan, D W ^[1]

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1. ORNL

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: ORNL Oak Ridge National Laboratory
• Sponsoring Organization: DOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 829443
• Report Number(s): P00-107747
• Journal Information: Physical Review, C (Nuclear Physics), Journal Name: Physical Review, C (Nuclear Physics) Journal Issue: 5 Vol. 62; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASTROPHYSICS
ERUPTIVE VARIABLE STARS
EXCITATION FUNCTIONS
FLUORINE 17
NEON 18
NUCLEAR REACTION KINETICS
RADIOACTIVE ION BEAMS
RESONANCE