Constraining the Neutron Star Compactness: Extraction of the Al 23 (p,γ) Reaction Rate for the rp Process

C. Wolf; C. Langer; F. Montes; J. Pereira; W. J. Ong; T. Poxon-Pearson; S. Ahn; S. Ayoub; T. Baumann; D. Bazin; P. C. Bender; B. A. Brown; J. Browne; H. Crawford; R. H. Cyburt; E. Deleeuw; B. Elman; S. Fiebiger; A. Gade; P. Gastis; S. Lipschutz; B. Longfellow; Z. Meisel; F. M. Nunes; G. Perdikakis; R. Reifarth; W. A. Richter; H. Schatz; K. Schmidt; J. Schmitt; C. Sullivan; R. Titus; D. Weisshaar; P. J. Woods; J. C. Zamora; R. G.T. Zegers

doi:10.1103/PhysRevLett.122.232701

Constraining the Neutron Star Compactness: Extraction of the Al 23 (p,γ) Reaction Rate for the rp Process

C. Wolf, C. Langer, F. Montes, J. Pereira, W. J. Ong, T. Poxon-Pearson, S. Ahn, S. Ayoub, T. Baumann, D. Bazin, P. C. Bender, B. A. Brown, J. Browne, H. Crawford, R. H. Cyburt, E. Deleeuw, B. Elman, S. Fiebiger, A. Gade, P. GastisS. Lipschutz, B. Longfellow, Z. Meisel, F. M. Nunes, G. Perdikakis, R. Reifarth, W. A. Richter, H. Schatz, K. Schmidt, J. Schmitt, C. Sullivan, R. Titus, D. Weisshaar, P. J. Woods, J. C. Zamora, R. G.T. Zegers

Physics

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14 Scopus citations

Abstract

The Al23(p,γ)Si24 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 Al23(d,n) reaction was used to populate the astrophysically important states in Si24. 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 22+ and (41+,02+) state in Si24 was disentangled, finally resolving conflicting results from two previous measurements. Moreover, 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.

Original language	English
Article number	232701
Journal	Physical Review Letters
Volume	122
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevLett.122.232701
State	Published - Jun 11 2019

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10.1103/PhysRevLett.122.232701

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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., ... Zegers, R. G. T. (2019). Constraining the Neutron Star Compactness: Extraction of the Al 23 (p,γ) Reaction Rate for the rp Process. Physical Review Letters, 122(23), Article 232701. https://doi.org/10.1103/PhysRevLett.122.232701

@article{49e67a08ac7449819cc2067f36dd1e6b,

title = "Constraining the Neutron Star Compactness: Extraction of the Al 23 (p,γ) Reaction Rate for the rp Process",

abstract = "The Al23(p,γ)Si24 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 Al23(d,n) reaction was used to populate the astrophysically important states in Si24. 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 22+ and (41+,02+) state in Si24 was disentangled, finally resolving conflicting results from two previous measurements. Moreover, 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.",

author = "C. Wolf and C. Langer and F. Montes and J. Pereira and Ong, {W. J.} and T. Poxon-Pearson and S. Ahn and S. Ayoub and T. Baumann and D. Bazin and Bender, {P. C.} and Brown, {B. A.} and J. Browne and H. Crawford and Cyburt, {R. H.} and E. Deleeuw and B. Elman and S. Fiebiger and A. Gade and P. Gastis and S. Lipschutz and B. Longfellow and Z. Meisel and Nunes, {F. M.} and G. Perdikakis and R. Reifarth and Richter, {W. A.} and H. Schatz and K. Schmidt and J. Schmitt and C. Sullivan and R. Titus and D. Weisshaar and Woods, {P. J.} and Zamora, {J. C.} and Zegers, {R. G.T.}",

note = "Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

year = "2019",

month = jun,

day = "11",

doi = "10.1103/PhysRevLett.122.232701",

language = "English",

volume = "122",

journal = "Physical Review Letters",

issn = "0031-9007",

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Wolf, C, Langer, C, Montes, F, Pereira, J, Ong, WJ, Poxon-Pearson, T, Ahn, S, Ayoub, S, Baumann, T, Bazin, D, Bender, PC, Brown, BA, Browne, J, Crawford, H, Cyburt, RH, Deleeuw, E, Elman, B, Fiebiger, S, Gade, A, Gastis, P, Lipschutz, S, Longfellow, B, Meisel, Z, Nunes, FM, Perdikakis, G, Reifarth, R, Richter, WA, Schatz, H, Schmidt, K, Schmitt, J, Sullivan, C, Titus, R, Weisshaar, D, Woods, PJ, Zamora, JC & Zegers, RGT 2019, 'Constraining the Neutron Star Compactness: Extraction of the Al 23 (p,γ) Reaction Rate for the rp Process', Physical Review Letters, vol. 122, no. 23, 232701. https://doi.org/10.1103/PhysRevLett.122.232701

TY - JOUR

T1 - Constraining the Neutron Star Compactness

T2 - Extraction of the Al 23 (p,γ) Reaction Rate for the rp Process

AU - Wolf, C.

AU - Langer, C.

AU - Montes, F.

AU - Pereira, J.

AU - Ong, W. J.

AU - Poxon-Pearson, T.

AU - Ahn, S.

AU - Ayoub, S.

AU - Baumann, T.

AU - Bazin, D.

AU - Bender, P. C.

AU - Brown, B. A.

AU - Browne, J.

AU - Crawford, H.

AU - Cyburt, R. H.

AU - Deleeuw, E.

AU - Elman, B.

AU - Fiebiger, S.

AU - Gade, A.

AU - Gastis, P.

AU - Lipschutz, S.

AU - Longfellow, B.

AU - Meisel, Z.

AU - Nunes, F. M.

AU - Perdikakis, G.

AU - Reifarth, R.

AU - Richter, W. A.

AU - Schatz, H.

AU - Schmidt, K.

AU - Schmitt, J.

AU - Sullivan, C.

AU - Titus, R.

AU - Weisshaar, D.

AU - Woods, P. J.

AU - Zamora, J. C.

AU - Zegers, R. G.T.

PY - 2019/6/11

Y1 - 2019/6/11

N2 - The Al23(p,γ)Si24 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 Al23(d,n) reaction was used to populate the astrophysically important states in Si24. 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 22+ and (41+,02+) state in Si24 was disentangled, finally resolving conflicting results from two previous measurements. Moreover, 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.

AB - The Al23(p,γ)Si24 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 Al23(d,n) reaction was used to populate the astrophysically important states in Si24. 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 22+ and (41+,02+) state in Si24 was disentangled, finally resolving conflicting results from two previous measurements. Moreover, 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.

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U2 - 10.1103/PhysRevLett.122.232701

DO - 10.1103/PhysRevLett.122.232701

M3 - Article

C2 - 31298878

AN - SCOPUS:85067333059

SN - 0031-9007

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

IS - 23

M1 - 232701

ER -

Constraining the Neutron Star Compactness: Extraction of the Al 23 (p,γ) Reaction Rate for the rp Process

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