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The influence of {sup 18}F induced reactions in the hot CNO cycle

Description: The contribution of the {sup 18}F(p,{gamma}) reaction to the production of {sup 19}Ne, which is an important isotope in connection with the breakout from the hot CNO cycle, has been investigated in experiments with {sup 18}F beams. Measurements of the cross sections for the {sup 18}F(p,{alpha}){sup 15}O and {sup 18}F(p,{gamma}){sup 19 }Ne reactions indicate that the contribution of the {sup 18}F(p, {gamma}) route to the formation or {sup 19}Ne is small.
Date: August 1, 1996
Creator: Rehm, K.E.; Roberts, A.D. & Jiang, C.L.
Partner: UNT Libraries Government Documents Department

Exploring the {sup 18}F(p,{gamma}){sup 19}Ne gateway to the formation of heavy elements in hot stars

Description: An upper limit to the production of {sup 19}Ne through the {sup 18}F(p,{gamma}) reaction at the recently discovered s-wave resonance has been determined. The limit implies that in a hot stellar environment (T{sub 9} > 0.5) this reaction is not a significant gateway from the hot CNO cycle towards the production of heavier elements in stars.
Date: August 1, 1997
Creator: Rehm, K.E.; Jiang, C.L. & Paul, M.
Partner: UNT Libraries Government Documents Department

The astrophysical reaction rate for the {sup 18}F(p,{alpha}){sup 15}O reaction

Description: Proton and alpha widths for a 3/2{sup +} ({ell}{sub p} = 0) state in {sup 19}Ne at E{sub x} = 7.1 MeV have been extracted using the results of recent measurements of the {sup 18}F(p,{alpha}){sup 15}O reaction. This {ell}{sub p} = 0 resonance dominates the astrophysical reaction rates at temperatures T{sub 9} > 0.5.
Date: March 1, 1996
Creator: Rehm, K.E.; Paul, M. & Roberts, A.D.
Partner: UNT Libraries Government Documents Department

Nuclear reaction studies with radioactive {sup 18}F beams at ATLAS

Description: The contribution of the {sup 18}F(p,{gamma}) reaction to the production of {sup 19}Ne which is the crucial isotope for the breakout from the hot CNO cycle into the rp process, has been investigated in experiments with {sup 18}F beams. Measurements of the cross sections for the {sup 18}F(p,{alpha}){sup 15}O and the {sup 18}F(p,{gamma}){sup 19}Ne reactions indicate that the contribution from the (p,{gamma}) route to the formation of {sup 19}Ne is small.
Date: July 1, 1996
Creator: Rehm, K.E.; Paul, M. & Roberts, A.D.
Partner: UNT Libraries Government Documents Department

Physics with energetic radioactive ion beams

Description: Beams of short-lived, unstable nuclei have opened new dimensions in studies of nuclear structure and reactions. Such beams also provide key information on reactions that take place in our sun and other stars. Status and prospects of the physics with energetic radioactive beams are summarized.
Date: December 1996
Creator: Henning, W. F.
Partner: UNT Libraries Government Documents Department

High purity radioactive beams at the bevalac

Description: Peripheral nuclear fragmentation reactions of primary Bevalac heavy ion beams are used to produce secondary beams of radioactive nuclei. The large cross section and small deflection of the projectile fragments lead to high production and delivery efficiency for these beams. Dispersive beam transport allows good separation and purification of the desired secondary beams. /sup 11/C and /sup 19/Ne beams of high purity and good intensity (almost 0.2% of the primary beam current) are presently being used for biomedical experiments.
Date: March 1, 1979
Creator: Alonso, J.R.; Chatterjee, A. & Tobias, C.A.
Partner: UNT Libraries Government Documents Department

1/2/sup +/. -->. 1/2/sup -/ beta decay of /sup 19/Ne and the parity nonconserving NN force

Description: A branching ratio of (1.20 +- 0.20) x 10/sup -4/ is obtained for the ..beta../sup +/ decay of /sup 19/Ne to the 110 keV 1/2/sup -/ level of /sup 19/F. This transition (presumably dominated by the ..delta..J/sup ..pi../ = 0/sup -/ axial charge operator) provides a crucial test of wavefunctions used in interpreting the parity mixing of the ground and 110 keV levels of /sup 19/F. These wavefunctions, which yield a parity mixing larger than that observed experimentally, also predict too large a ..beta../sup +/ decay rate.
Date: January 1, 1978
Creator: Adelberger, E.G.; Hindi, M.M.; Hoyle, C.D.; Swanson, H.E. & Von Lintig, R.D.
Partner: UNT Libraries Government Documents Department

First forbidden beta decay in light nuclei

Description: Beta decay matrix elements for the operators sigma dot del and sigma dot r are calculated for eight J/sup +/ ..-->.. J/sup -/ or J/sup -/ ..-->.. J/sup +/ beta transitions. Results using harmonic oscillator wave functions differ markedly from those using more realistic Woods-Saxon wave functions. A substantial contribution to the sigma dot del matrix elements from pion exchange currents is required to reproduce the experimental beta decay rates. 15 references.
Date: January 1, 1984
Creator: Millener, D.J. & Warburton, E.K.
Partner: UNT Libraries Government Documents Department