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Title: Constraining the Neutron Star Compactness: Extraction of the Al 23 ( p , γ ) Reaction Rate for the r p Process [Constraints on the Neutron Star Compactness: Extraction of the Important 23Al(p,γ) Reaction Rate for the rp-Process]

Abstract

The 23Al(p,γ)24Si reaction is among the most important reactions driving the energy generation in type-I x-ray bursts. However, the present reaction-rate uncertainty limits constraints on neutron star properties that can be achieved with burst model-observation comparisons. Here, we present a novel technique for constraining this important reaction by combining the GRETINA array with the neutron detector LENDA coupled to the S800 spectrograph at the National Superconducting Cyclotron Laboratory. The 23Al(d,n) reaction was used to populate the astrophysically important states in 24Si. This enables a measurement in complete kinematics for extracting all relevant inputs necessary to calculate the reaction rate. For the first time, a predicted close-lying doublet of a 2 + 2 and (4 + 1,0 + 2) state in 24Si was disentangled, finally resolving conflicting results from two previous measurements. Furthermore, it was possible to extract spectroscopic factors using GRETINA and LENDA simultaneously. This new technique may be used to constrain other important reaction rates for various astrophysical scenarios.

Authors:
 [1];  [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [2];  [2];  [2];  [1];  [2];  [4] more »;  [2];  [2];  [5];  [2];  [4];  [1];  [6];  [2];  [7];  [2];  [2];  [2];  [2];  [8];  [2];  [2] « less
  1. Goethe Univ., Frankfurt am Main (Germany)
  2. Michigan State Univ., East Lansing, MI (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Central Michigan Univ., Mount Pleasant, MI (United States); Michigan State Univ., East Lansing, MI (United States)
  5. Ohio Univ., Athens, OH (United States); Michigan State Univ., East Lansing, MI (United States)
  6. Univ. of Stellenbosch, Matieland (South Africa); iThemba LABS, Somerset West (South Africa)
  7. Michigan State Univ., East Lansing, MI (United States); TU Dresden (Dresden)
  8. Univ. of Edinburgh, Edinburgh (United Kingdom)
Publication Date:
Research Org.:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
Contributing Org.:
Michigan State University
OSTI Identifier:
1525889
Alternate Identifier(s):
OSTI ID: 1546304
Grant/Contract Number:  
FG52-08NA28552; SC0014537; AC02-05CH11231; FG02-88ER40387; SC0019042; FG52-08NA2855; NA0003180
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 23; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Wolf, C., Langer, C., Montes, F., Pereira, J., Ong, W. -J., Poxon-Pearson, T., Ahn, S., Ayoub, S., Baumann, T., Bazin, D., Bender, P. C., Brown, B. A., Browne, J., Crawford, H., Cyburt, R. H., Deleeuw, E., Elman, B., Fiebiger, S., Gade, A., Gastis, P., Lipschutz, S., Longfellow, B., Meisel, Z., Nunes, F. M., Perdikakis, G., Reifarth, R., Richter, W. A., Schatz, H., Schmidt, K., Schmitt, J., Sullivan, C., Titus, R., Weisshaar, D., Woods, P. J., Zamora, J. C., and Zegers, R. G. T. Constraining the Neutron Star Compactness: Extraction of the Al23(p,γ) Reaction Rate for the rp Process [Constraints on the Neutron Star Compactness: Extraction of the Important 23Al(p,γ) Reaction Rate for the rp-Process]. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.232701.
Wolf, C., Langer, C., Montes, F., Pereira, J., Ong, W. -J., Poxon-Pearson, T., Ahn, S., Ayoub, S., Baumann, T., Bazin, D., Bender, P. C., Brown, B. A., Browne, J., Crawford, H., Cyburt, R. H., Deleeuw, E., Elman, B., Fiebiger, S., Gade, A., Gastis, P., Lipschutz, S., Longfellow, B., Meisel, Z., Nunes, F. M., Perdikakis, G., Reifarth, R., Richter, W. A., Schatz, H., Schmidt, K., Schmitt, J., Sullivan, C., Titus, R., Weisshaar, D., Woods, P. J., Zamora, J. C., & Zegers, R. G. T. Constraining the Neutron Star Compactness: Extraction of the Al23(p,γ) Reaction Rate for the rp Process [Constraints on the Neutron Star Compactness: Extraction of the Important 23Al(p,γ) Reaction Rate for the rp-Process]. United States. doi:10.1103/PhysRevLett.122.232701.
Wolf, C., Langer, C., Montes, F., Pereira, J., Ong, W. -J., Poxon-Pearson, T., Ahn, S., Ayoub, S., Baumann, T., Bazin, D., Bender, P. C., Brown, B. A., Browne, J., Crawford, H., Cyburt, R. H., Deleeuw, E., Elman, B., Fiebiger, S., Gade, A., Gastis, P., Lipschutz, S., Longfellow, B., Meisel, Z., Nunes, F. M., Perdikakis, G., Reifarth, R., Richter, W. A., Schatz, H., Schmidt, K., Schmitt, J., Sullivan, C., Titus, R., Weisshaar, D., Woods, P. J., Zamora, J. C., and Zegers, R. G. T. Tue . "Constraining the Neutron Star Compactness: Extraction of the Al23(p,γ) Reaction Rate for the rp Process [Constraints on the Neutron Star Compactness: Extraction of the Important 23Al(p,γ) Reaction Rate for the rp-Process]". United States. doi:10.1103/PhysRevLett.122.232701. https://www.osti.gov/servlets/purl/1525889.
@article{osti_1525889,
title = {Constraining the Neutron Star Compactness: Extraction of the Al23(p,γ) Reaction Rate for the rp Process [Constraints on the Neutron Star Compactness: Extraction of the Important 23Al(p,γ) Reaction Rate for the rp-Process]},
author = {Wolf, C. and Langer, C. and Montes, F. and Pereira, J. and Ong, W. -J. and Poxon-Pearson, T. and Ahn, S. and Ayoub, S. and Baumann, T. and Bazin, D. and Bender, P. C. and Brown, B. A. and Browne, J. and Crawford, H. and Cyburt, R. H. and Deleeuw, E. and Elman, B. and Fiebiger, S. and Gade, A. and Gastis, P. and Lipschutz, S. and Longfellow, B. and Meisel, Z. and Nunes, F. M. and Perdikakis, G. and Reifarth, R. and Richter, W. A. and Schatz, H. and Schmidt, K. and Schmitt, J. and Sullivan, C. and Titus, R. and Weisshaar, D. and Woods, P. J. and Zamora, J. C. and Zegers, R. G. T.},
abstractNote = {The 23Al(p,γ)24Si reaction is among the most important reactions driving the energy generation in type-I x-ray bursts. However, the present reaction-rate uncertainty limits constraints on neutron star properties that can be achieved with burst model-observation comparisons. Here, we present a novel technique for constraining this important reaction by combining the GRETINA array with the neutron detector LENDA coupled to the S800 spectrograph at the National Superconducting Cyclotron Laboratory. The 23Al(d,n) reaction was used to populate the astrophysically important states in 24Si. This enables a measurement in complete kinematics for extracting all relevant inputs necessary to calculate the reaction rate. For the first time, a predicted close-lying doublet of a 2+2 and (4+1,0+2) state in 24Si was disentangled, finally resolving conflicting results from two previous measurements. Furthermore, it was possible to extract spectroscopic factors using GRETINA and LENDA simultaneously. This new technique may be used to constrain other important reaction rates for various astrophysical scenarios.},
doi = {10.1103/PhysRevLett.122.232701},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 23,
volume = 122,
place = {United States},
year = {2019},
month = {6}
}

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