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Key ^{19}Ne States Identified Affecting γ-Ray Emission from ^{18}F in Novae.

Authors :
Hall MR
Bardayan DW
Baugher T
Lepailleur A
Pain SD
Ratkiewicz A
Ahn S
Allen JM
Anderson JT
Ayangeakaa AD
Blackmon JC
Burcher S
Carpenter MP
Cha SM
Chae KY
Chipps KA
Cizewski JA
Febbraro M
Hall O
Hu J
Jiang CL
Jones KL
Lee EJ
O'Malley PD
Ota S
Rasco BC
Santiago-Gonzalez D
Seweryniak D
Sims H
Smith K
Tan WP
Thompson P
Thornsberry C
Varner RL
Walter D
Wilson GL
Zhu S
Source :
Physical review letters [Phys Rev Lett] 2019 Feb 08; Vol. 122 (5), pp. 052701.
Publication Year :
2019

Abstract

Detection of nuclear-decay γ rays provides a sensitive thermometer of nova nucleosynthesis. The most intense γ-ray flux is thought to be annihilation radiation from the β^{+} decay of ^{18}F, which is destroyed prior to decay by the ^{18}F(p,α)^{15}O reaction. Estimates of ^{18}F production had been uncertain, however, because key near-threshold levels in the compound nucleus, ^{19}Ne, had yet to be identified. We report the first measurement of the ^{19}F(^{3}He,tγ)^{19}Ne reaction, in which the placement of two long-sought 3/2^{+} levels is suggested via triton-γ-γ coincidences. The precise determination of their resonance energies reduces the upper limit of the rate by a factor of 1.5-17 at nova temperatures and reduces the average uncertainty on the nova detection probability by a factor of 2.1.

Details

Language :
English
ISSN :
1079-7114
Volume :
122
Issue :
5
Database :
MEDLINE
Journal :
Physical review letters
Publication Type :
Academic Journal
Accession number :
30822026
Full Text :
https://doi.org/10.1103/PhysRevLett.122.052701