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Title: Study of Interference Effects in the 18F(p,alpha) 15O Reaction

Abstract

The {sup 18}F(p,{alpha}a){sup 15}O reaction plays a crucial role in understanding {gamma}-ray emission from novae. Because of the importance of understanding the {sup 18}F + p reactions, a number of studies of the A=19 isobars have been made using stable and exotic beams. The interference effects among J{sup {pi}} = 3/2{sup +} resonances in the {sup 18}F + p system, however, have never been measured, but they can change the S-factor by a factor of 20 at nova energies. R-matrix calculations indicate that the cross sections above the E{sub c.m.} = 665 keV resonance are sensitive to the interference between the E{sub c.m.} = 8, 38, and 665 keV resonances. In order to study the interference effects, an excitation function for the {sup 1}H({sup 18}F,{alpha}){sup 15}O reaction has been measured in the energy range of E{sub c.m.} = 663-877 keV using radioactive {sup 18}F beams at the Holifield Radioactive Ion Beam Facility. By measuring the {sup 18}F(p,{alpha}){sup 15}O cross section off resonance and comparing the cross section with theoretical calculations, we provide the first experimental constraints on the interference of 3/2{sup +} resonances.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Holifield Radioactive Ion Beam Facility
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)
OSTI Identifier:
944098
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos IX, Geneva, Switzerland, 20060625, 20060630
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ASTROPHYSICS; CROSS SECTIONS; ENERGY RANGE; EXCITATION FUNCTIONS; NOVAE; NUCLEI; R MATRIX; RADIOACTIVE ION BEAMS; RESONANCE; UNIVERSE

Citation Formats

Chae, Kyung Yuk, Bardayan, Daniel W, Blackmon, Jeff C, Gregory, Darren R, Guidry, Mike W, Johnson, Micah, KOZUB, RAYMOND L, Livesay, Jake, Ma, Zhanwen, Nesaraja, Caroline D, Pain, Steven D, Paulauskas, Stanley V, Porter-Peden, Matthew D, Shriner, Jr., John F, Smith, Michael Scott, Smith, Nathan A, and Thomas, Jeffrey S. Study of Interference Effects in the 18F(p,alpha)15O Reaction. United States: N. p., 2006. Web.
Chae, Kyung Yuk, Bardayan, Daniel W, Blackmon, Jeff C, Gregory, Darren R, Guidry, Mike W, Johnson, Micah, KOZUB, RAYMOND L, Livesay, Jake, Ma, Zhanwen, Nesaraja, Caroline D, Pain, Steven D, Paulauskas, Stanley V, Porter-Peden, Matthew D, Shriner, Jr., John F, Smith, Michael Scott, Smith, Nathan A, & Thomas, Jeffrey S. Study of Interference Effects in the 18F(p,alpha)15O Reaction. United States.
Chae, Kyung Yuk, Bardayan, Daniel W, Blackmon, Jeff C, Gregory, Darren R, Guidry, Mike W, Johnson, Micah, KOZUB, RAYMOND L, Livesay, Jake, Ma, Zhanwen, Nesaraja, Caroline D, Pain, Steven D, Paulauskas, Stanley V, Porter-Peden, Matthew D, Shriner, Jr., John F, Smith, Michael Scott, Smith, Nathan A, and Thomas, Jeffrey S. Sun . "Study of Interference Effects in the 18F(p,alpha)15O Reaction". United States. doi:.
@article{osti_944098,
title = {Study of Interference Effects in the 18F(p,alpha)15O Reaction},
author = {Chae, Kyung Yuk and Bardayan, Daniel W and Blackmon, Jeff C and Gregory, Darren R and Guidry, Mike W and Johnson, Micah and KOZUB, RAYMOND L and Livesay, Jake and Ma, Zhanwen and Nesaraja, Caroline D and Pain, Steven D and Paulauskas, Stanley V and Porter-Peden, Matthew D and Shriner, Jr., John F and Smith, Michael Scott and Smith, Nathan A and Thomas, Jeffrey S},
abstractNote = {The {sup 18}F(p,{alpha}a){sup 15}O reaction plays a crucial role in understanding {gamma}-ray emission from novae. Because of the importance of understanding the {sup 18}F + p reactions, a number of studies of the A=19 isobars have been made using stable and exotic beams. The interference effects among J{sup {pi}} = 3/2{sup +} resonances in the {sup 18}F + p system, however, have never been measured, but they can change the S-factor by a factor of 20 at nova energies. R-matrix calculations indicate that the cross sections above the E{sub c.m.} = 665 keV resonance are sensitive to the interference between the E{sub c.m.} = 8, 38, and 665 keV resonances. In order to study the interference effects, an excitation function for the {sup 1}H({sup 18}F,{alpha}){sup 15}O reaction has been measured in the energy range of E{sub c.m.} = 663-877 keV using radioactive {sup 18}F beams at the Holifield Radioactive Ion Beam Facility. By measuring the {sup 18}F(p,{alpha}){sup 15}O cross section off resonance and comparing the cross section with theoretical calculations, we provide the first experimental constraints on the interference of 3/2{sup +} resonances.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

Conference:
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