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Title: Astrophysically Important 26Si States Studied with the 28Si(p,t) 26Si Reaction - II. Spin of the 5.914-MeV 26Si Level and Galactic 26Al Production

Abstract

The {sup 28}Si(p,t){sup 26}Si reaction has been studied to resolve a controversy surrounding the properties of the {sup 26}Si level at 5.914 MeV and its contribution to the {sup 25}Al(p,{gamma}){sup 26}Si reaction rate in novae, which affects interpretations of galactic {sup 26}Al observations. Recent studies have come to contradictory conclusions regarding the spin of this level (0+ or 3+), with a 3+ assignment implying a large contribution by this level to the {sup 25}Al(p,{gamma}){sup 26}Si reaction rate. We have extended our previous study to smaller angles and find the angular distribution of tritons populating the 5.914-MeV level in the {sup 28}Si(p,t){sup 26}Si reaction to be consistent with either a 2+ or 3+ assignment. We have calculated reaction rates under these assumptions and used them in a nova nucleosynthesis model to examine the effects of the remaining uncertainties in the {sup 25}Al(p,{gamma}){sup 26}Si rate on {sup 26}Al production in novae.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [1];  [1];  [1];  [4];  [3];  [1];  [4];  [5]
  1. ORNL
  2. University of Tennessee, Knoxville (UTK)
  3. Tennessee Technological University
  4. Rutgers University
  5. University of North Carolina, Chapel Hill
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Holifield Radioactive Ion Beam Facility
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
931873
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review C; Journal Volume: 74; Journal Issue: 4
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANGULAR DISTRIBUTION; NOVAE; NUCLEOSYNTHESIS; PRODUCTION; REACTION KINETICS; SPIN; TRITONS; ASTROPHYSICS; SILICON ISOTOPES

Citation Formats

Bardayan, Daniel W, Howard, Joshua A, Blackmon, Jeff C, Brune, Carl, Chae, Kyung Yuk, Hix, William Raphael, Johnson, Micah, Jones, K. L., Kozub, R. L., Liang, J Felix, Lingerfelt, Eric J, Livesay, Jake, Pain, S. D., Scott, J. P., Smith, Michael Scott, Thomas, J. S., and Visser, D. W. Astrophysically Important 26Si States Studied with the 28Si(p,t)26Si Reaction - II. Spin of the 5.914-MeV 26Si Level and Galactic 26Al Production. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.74.045804.
Bardayan, Daniel W, Howard, Joshua A, Blackmon, Jeff C, Brune, Carl, Chae, Kyung Yuk, Hix, William Raphael, Johnson, Micah, Jones, K. L., Kozub, R. L., Liang, J Felix, Lingerfelt, Eric J, Livesay, Jake, Pain, S. D., Scott, J. P., Smith, Michael Scott, Thomas, J. S., & Visser, D. W. Astrophysically Important 26Si States Studied with the 28Si(p,t)26Si Reaction - II. Spin of the 5.914-MeV 26Si Level and Galactic 26Al Production. United States. doi:10.1103/PhysRevC.74.045804.
Bardayan, Daniel W, Howard, Joshua A, Blackmon, Jeff C, Brune, Carl, Chae, Kyung Yuk, Hix, William Raphael, Johnson, Micah, Jones, K. L., Kozub, R. L., Liang, J Felix, Lingerfelt, Eric J, Livesay, Jake, Pain, S. D., Scott, J. P., Smith, Michael Scott, Thomas, J. S., and Visser, D. W. Sun . "Astrophysically Important 26Si States Studied with the 28Si(p,t)26Si Reaction - II. Spin of the 5.914-MeV 26Si Level and Galactic 26Al Production". United States. doi:10.1103/PhysRevC.74.045804.
@article{osti_931873,
title = {Astrophysically Important 26Si States Studied with the 28Si(p,t)26Si Reaction - II. Spin of the 5.914-MeV 26Si Level and Galactic 26Al Production},
author = {Bardayan, Daniel W and Howard, Joshua A and Blackmon, Jeff C and Brune, Carl and Chae, Kyung Yuk and Hix, William Raphael and Johnson, Micah and Jones, K. L. and Kozub, R. L. and Liang, J Felix and Lingerfelt, Eric J and Livesay, Jake and Pain, S. D. and Scott, J. P. and Smith, Michael Scott and Thomas, J. S. and Visser, D. W.},
abstractNote = {The {sup 28}Si(p,t){sup 26}Si reaction has been studied to resolve a controversy surrounding the properties of the {sup 26}Si level at 5.914 MeV and its contribution to the {sup 25}Al(p,{gamma}){sup 26}Si reaction rate in novae, which affects interpretations of galactic {sup 26}Al observations. Recent studies have come to contradictory conclusions regarding the spin of this level (0+ or 3+), with a 3+ assignment implying a large contribution by this level to the {sup 25}Al(p,{gamma}){sup 26}Si reaction rate. We have extended our previous study to smaller angles and find the angular distribution of tritons populating the 5.914-MeV level in the {sup 28}Si(p,t){sup 26}Si reaction to be consistent with either a 2+ or 3+ assignment. We have calculated reaction rates under these assumptions and used them in a nova nucleosynthesis model to examine the effects of the remaining uncertainties in the {sup 25}Al(p,{gamma}){sup 26}Si rate on {sup 26}Al production in novae.},
doi = {10.1103/PhysRevC.74.045804},
journal = {Physical Review C},
number = 4,
volume = 74,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}