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Title: 30S Studied with the 32S( p,t) 30S Reaction and the 29P( p,{gamma}) 30S Reaction Rate

Abstract

The 29P(p,gamma)30S rate affects interpretation of nova Si abundances, which have been precisely measured in presolar grains. The rate is thought to be dominated by previously unobserved 3+ and 2+ resonances above the 30S proton threshold at 4400 keV. To better understand the 29P(p,gamma)30S rate, we have studied the 30S nucleus with the 32S(p,t)30S reaction. We have observed 13 30S levels - 9 of which are above the proton threshold including a level at 4704 keV that is a candidate to be the important 3+ resonance. From the observed triton angular distributions, we additionally constrain the spins of several levels. Using our updated information, we estimate the 29P(p,gamma)30S reaction rate is approximately six times larger at nova temperatures than previously thought.

Authors:
 [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:
932058
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review C; Journal Volume: 76; Journal Issue: 4
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANGULAR DISTRIBUTION; PROTONS; REACTION KINETICS; RESONANCE; SULFUR ISOTOPES; PHOSPHORUS 29; nova; 30s; (p; t); silicon; sulfur

Citation Formats

Bardayan, Daniel W, Blackmon, Jeff C, Fitzgerald, Ryan, Hix, William Raphael, Grzywacz-Jones, Kate L, KOZUB, RAYMOND L, Liang, J Felix, Livesay, Jake, Ma, Zhanwen, Roberts, Luke F, Smith, Michael Scott, Thomas, Jeffrey S, and Visser, Dale William. 30S Studied with the 32S(p,t)30S Reaction and the 29P(p,{gamma})30S Reaction Rate. United States: N. p., 2007. Web. doi:10.1103/PhysRevC.76.045803.
Bardayan, Daniel W, Blackmon, Jeff C, Fitzgerald, Ryan, Hix, William Raphael, Grzywacz-Jones, Kate L, KOZUB, RAYMOND L, Liang, J Felix, Livesay, Jake, Ma, Zhanwen, Roberts, Luke F, Smith, Michael Scott, Thomas, Jeffrey S, & Visser, Dale William. 30S Studied with the 32S(p,t)30S Reaction and the 29P(p,{gamma})30S Reaction Rate. United States. doi:10.1103/PhysRevC.76.045803.
Bardayan, Daniel W, Blackmon, Jeff C, Fitzgerald, Ryan, Hix, William Raphael, Grzywacz-Jones, Kate L, KOZUB, RAYMOND L, Liang, J Felix, Livesay, Jake, Ma, Zhanwen, Roberts, Luke F, Smith, Michael Scott, Thomas, Jeffrey S, and Visser, Dale William. Mon . "30S Studied with the 32S(p,t)30S Reaction and the 29P(p,{gamma})30S Reaction Rate". United States. doi:10.1103/PhysRevC.76.045803.
@article{osti_932058,
title = {30S Studied with the 32S(p,t)30S Reaction and the 29P(p,{gamma})30S Reaction Rate},
author = {Bardayan, Daniel W and Blackmon, Jeff C and Fitzgerald, Ryan and Hix, William Raphael and Grzywacz-Jones, Kate L and KOZUB, RAYMOND L and Liang, J Felix and Livesay, Jake and Ma, Zhanwen and Roberts, Luke F and Smith, Michael Scott and Thomas, Jeffrey S and Visser, Dale William},
abstractNote = {The 29P(p,gamma)30S rate affects interpretation of nova Si abundances, which have been precisely measured in presolar grains. The rate is thought to be dominated by previously unobserved 3+ and 2+ resonances above the 30S proton threshold at 4400 keV. To better understand the 29P(p,gamma)30S rate, we have studied the 30S nucleus with the 32S(p,t)30S reaction. We have observed 13 30S levels - 9 of which are above the proton threshold including a level at 4704 keV that is a candidate to be the important 3+ resonance. From the observed triton angular distributions, we additionally constrain the spins of several levels. Using our updated information, we estimate the 29P(p,gamma)30S reaction rate is approximately six times larger at nova temperatures than previously thought.},
doi = {10.1103/PhysRevC.76.045803},
journal = {Physical Review C},
number = 4,
volume = 76,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}