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Title: Exploiting Isospin Symmetry to Study the Role of Isomers in Stellar Environments

Abstract

Proton capture on the excited isomeric state of 26Al strongly influences the abundance of 26Mg ejected in explosive astronomical events and, as such, plays a critical role in determining the initial content of radiogenic 26Al in presolar grains. This reaction also affects the temperature range for thermal equilibrium between the ground and isomeric levels. We present a novel technique, that exploits the isospin symmetry of the nuclear force, to address the long-standing challenge of determining proton-capture rates on excited nuclear levels. Such a technique has in-built tests that strongly support its veracity and, for the first time, we have experimentally constrained the strengths of resonances that dominate the astrophysical 26mAl(p, γ)27Si reaction. Furthermore, these constraints demonstrate that the rate is at least a factor ~ 8 lower than previously expected, indicating an increase in the stellar production of 26Mg and a possible need to reinvestigate sensitivity studies involving the thermal equilibration of 26Al.

Authors:
 [1];  [1]; ORCiD logo [2];  [1];  [2];  [3];  [2];  [2];  [1];  [2];  [4];  [5];  [2];  [2];  [2];  [6];  [5];  [2];  [2];  [7] more »; ORCiD logo [8]; ORCiD logo [1]; ORCiD logo [2];  [2] « less
  1. Univ. of Surrey, Guildford (United Kingdom)
  2. Michigan State Univ., East Lansing, MI (United States)
  3. Michigan State Univ., East Lansing, MI (United States); Univ. of Massachusetts, Lowell, MA (United States)
  4. Central Michigan Univ., Mount Pleasant, MI (United States)
  5. Univ. of Notre Dame, IN (United States)
  6. Univ. of Surrey, Guildford (United Kingdom); Univ. de Strasbourg (France)
  7. Argonne National Lab. (ANL), Argonne, IL (United States)
  8. Michigan State Univ., East Lansing, MI (United States); Helmholts-Zentrum Dresden-Rossendorf (Germany)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA) - Office of International Nuclear Safeguards; Science and Technologies Facilities Council (STFC-UK)
OSTI Identifier:
1781805
Alternate Identifier(s):
OSTI ID: 1763447
Grant/Contract Number:  
AC02-06CH11357; SC0020451; SC001453; AC02-05CH11231; PHY-1565546; PHY-1913554; PHY-1811855; PHY-1430152
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 126; Journal Issue: 4; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Nuclear astrophysics; Nuclear structure & decays; Transfer reactions

Citation Formats

Hallam, S., Lotay, G., Gade, A., Doherty, D.  T., Belarge, J., Bender, P.  C., Brown, B.  A., Browne, J., Catford, W.  N., Elman, B., Estradé, A., Hall, M.  R., Longfellow, B., Lunderberg, E., Montes, F., Moukaddam, M., O’Malley, P., Ong, W. -J., Schatz, H., Seweryniak, D., Schmidt, K., Timofeyuk, N.  K., Weisshaar, D., and Zegers, R.  G. T. Exploiting Isospin Symmetry to Study the Role of Isomers in Stellar Environments. United States: N. p., 2021. Web. doi:10.1103/physrevlett.126.042701.
Hallam, S., Lotay, G., Gade, A., Doherty, D.  T., Belarge, J., Bender, P.  C., Brown, B.  A., Browne, J., Catford, W.  N., Elman, B., Estradé, A., Hall, M.  R., Longfellow, B., Lunderberg, E., Montes, F., Moukaddam, M., O’Malley, P., Ong, W. -J., Schatz, H., Seweryniak, D., Schmidt, K., Timofeyuk, N.  K., Weisshaar, D., & Zegers, R.  G. T. Exploiting Isospin Symmetry to Study the Role of Isomers in Stellar Environments. United States. https://doi.org/10.1103/physrevlett.126.042701
Hallam, S., Lotay, G., Gade, A., Doherty, D.  T., Belarge, J., Bender, P.  C., Brown, B.  A., Browne, J., Catford, W.  N., Elman, B., Estradé, A., Hall, M.  R., Longfellow, B., Lunderberg, E., Montes, F., Moukaddam, M., O’Malley, P., Ong, W. -J., Schatz, H., Seweryniak, D., Schmidt, K., Timofeyuk, N.  K., Weisshaar, D., and Zegers, R.  G. T. 2021. "Exploiting Isospin Symmetry to Study the Role of Isomers in Stellar Environments". United States. https://doi.org/10.1103/physrevlett.126.042701.
@article{osti_1781805,
title = {Exploiting Isospin Symmetry to Study the Role of Isomers in Stellar Environments},
author = {Hallam, S. and Lotay, G. and Gade, A. and Doherty, D.  T. and Belarge, J. and Bender, P.  C. and Brown, B.  A. and Browne, J. and Catford, W.  N. and Elman, B. and Estradé, A. and Hall, M.  R. and Longfellow, B. and Lunderberg, E. and Montes, F. and Moukaddam, M. and O’Malley, P. and Ong, W. -J. and Schatz, H. and Seweryniak, D. and Schmidt, K. and Timofeyuk, N.  K. and Weisshaar, D. and Zegers, R.  G. T.},
abstractNote = {Proton capture on the excited isomeric state of 26Al strongly influences the abundance of 26Mg ejected in explosive astronomical events and, as such, plays a critical role in determining the initial content of radiogenic 26Al in presolar grains. This reaction also affects the temperature range for thermal equilibrium between the ground and isomeric levels. We present a novel technique, that exploits the isospin symmetry of the nuclear force, to address the long-standing challenge of determining proton-capture rates on excited nuclear levels. Such a technique has in-built tests that strongly support its veracity and, for the first time, we have experimentally constrained the strengths of resonances that dominate the astrophysical 26mAl(p, γ)27Si reaction. Furthermore, these constraints demonstrate that the rate is at least a factor ~ 8 lower than previously expected, indicating an increase in the stellar production of 26Mg and a possible need to reinvestigate sensitivity studies involving the thermal equilibration of 26Al.},
doi = {10.1103/physrevlett.126.042701},
url = {https://www.osti.gov/biblio/1781805}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 4,
volume = 126,
place = {United States},
year = {2021},
month = {1}
}

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