Low energy proton capture in light nuclei. Progress report, September 1, 1993--June 8, 1994
Abstract
Radiative capture reactions with light nuclei are of special interest in nuclear astrophysics because of their importance in the formation of the various elements. In many cases a simple direct-capture model that considers only the electromagnetic interaction is sufficient to reproduce experimental results. A direct-semidirect process may be used in which the transition amplitude is the sum of a direct term and another term representing the excitation of the target nucleus into a collective state. In cases where these approaches are not sufficient, the relative simplicity of nuclear systems with small numbers of fundamental particles allows microscopic calculations of measurable quantities from nucleon-nucleon potentials, using the multichannel resonating group model or, in some cases, Faddeev calculations. In the summer of 1990, the PI began a collaboration with Professor Henry Weller`s group at the Triangle Universities Nuclear Laboratory (TUNL). Weller`s group has studied radiative capture reactions with polarized beams at TUNL for over a decade, developing considerable expertise in the detection of high energy gamma rays and for the analysis of the measurements. The PI has been involved in the development of a new series of experiments at beam energies below 100 keV, using the positive beam directly from the highmore »
- Authors:
- Publication Date:
- Research Org.:
- West Georgia Coll., Carrollton, GA (United States). Dept. of Physics
- Sponsoring Org.:
- USDOE, Washington, DC (United States)
- OSTI Identifier:
- 67709
- Report Number(s):
- DOE/ER/40808-T1
ON: DE95012197; TRN: 95:004609
- DOE Contract Number:
- FG05-93ER40808
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 66 PHYSICS; LITHIUM 7 TARGET; PROTON REACTIONS; CAPTURE; LITHIUM 6 TARGET; DEUTERIUM TARGET; PROGRESS REPORT; LIGHT NUCLEI; KEV RANGE 10-100
Citation Formats
Prior, R.M. Low energy proton capture in light nuclei. Progress report, September 1, 1993--June 8, 1994. United States: N. p., 1995.
Web. doi:10.2172/67709.
Prior, R.M. Low energy proton capture in light nuclei. Progress report, September 1, 1993--June 8, 1994. United States. doi:10.2172/67709.
Prior, R.M. Thu .
"Low energy proton capture in light nuclei. Progress report, September 1, 1993--June 8, 1994". United States.
doi:10.2172/67709. https://www.osti.gov/servlets/purl/67709.
@article{osti_67709,
title = {Low energy proton capture in light nuclei. Progress report, September 1, 1993--June 8, 1994},
author = {Prior, R.M.},
abstractNote = {Radiative capture reactions with light nuclei are of special interest in nuclear astrophysics because of their importance in the formation of the various elements. In many cases a simple direct-capture model that considers only the electromagnetic interaction is sufficient to reproduce experimental results. A direct-semidirect process may be used in which the transition amplitude is the sum of a direct term and another term representing the excitation of the target nucleus into a collective state. In cases where these approaches are not sufficient, the relative simplicity of nuclear systems with small numbers of fundamental particles allows microscopic calculations of measurable quantities from nucleon-nucleon potentials, using the multichannel resonating group model or, in some cases, Faddeev calculations. In the summer of 1990, the PI began a collaboration with Professor Henry Weller`s group at the Triangle Universities Nuclear Laboratory (TUNL). Weller`s group has studied radiative capture reactions with polarized beams at TUNL for over a decade, developing considerable expertise in the detection of high energy gamma rays and for the analysis of the measurements. The PI has been involved in the development of a new series of experiments at beam energies below 100 keV, using the positive beam directly from the high intensity atomic beam polarized ion source. This work is the topic of the present grant, which began September 1, 1993. The main activity in the grant occurs during the summer months. Since this is the first year of the grant, most of that activity will be during the upcoming summer months. The PI will travel to TUNL in mid-June and will spend most of his time from then through August either at TUNL or working on data reduction and other calculations at West Georgia College. The PI is moving from West Georgia College (WGC) to North Georgia College (NGC) in September, 1994. He will be Professor and Chair of Physics there as he has been at WGC.},
doi = {10.2172/67709},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 1995},
month = {Thu Jun 01 00:00:00 EDT 1995}
}
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A facility and techniques have been developed which use the intense polarized beam from the Triangle Universities Nuclear Laboratory polarized ion source for low energy radiative capture reactions. A number of reactions have been investigated for targets ranging from hydrogen to beryllium. For some of the reactions unexpectedly large polarization effects were observed. These effects call into question previous assumptions about the low energy nature of the reactions and about the extrapolation of the yields to astrophysically significant energies. Novel techniques of measurement and analysis of the reactions have been developed.
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Competing structures in nuclei near closed shells. Progress report on research in nuclear physics, September 1, 1993--July 31, 1994
This report covers the following topics: GRID lifetime measurements in neodymium 144; fast electronic timing system; and massive neutrino searches.