Investigation of secondary γ -ray angular distributions using the N 15 (p,α1γ) C ∗ 12 reaction

R. J. Deboer; A. Boeltzig; K. T. Macon; S. Aguilar; O. Gomez; B. Frentz; S. L. Henderson; R. Kelmar; M. Renaud; G. Seymour; B. Vande Kolk; M. Wiescher; C. R. Brune; S. P. Burcher; K. L. Jones; J. M. Kovoor; M. Febbraro; G. Imbriani; S. Mosby; K. Smith; R. Toomey

doi:10.1103/PhysRevC.103.065801

Investigation of secondary γ -ray angular distributions using the N 15 (p,α1γ) C ∗ 12 reaction

R. J. Deboer, A. Boeltzig, K. T. Macon, S. Aguilar, O. Gomez, B. Frentz, S. L. Henderson, R. Kelmar, M. Renaud, G. Seymour, B. Vande Kolk, M. Wiescher, C. R. Brune, S. P. Burcher, K. L. Jones, J. M. Kovoor, M. Febbraro, G. Imbriani, S. Mosby, K. SmithR. Toomey

Nuclear Structure and Nuclear Astrophysi

Research output: Contribution to journal › Article › peer-review

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Abstract

The observation of secondary γ-rays provides an alternative method of measuring cross sections that populate excited final states in nuclear reactions. The angular distributions of these γ-rays also provide information on the underlying reaction mechanism. Despite the large number of data of this type in the literature, publicly available R-matrix codes do not have the ability to calculate these types of angular distributions. In this paper, the mathematical formalism derived by C. R. Brune and R. J. deBoer [Phys. Rev. C 102, 024628 (2020)2469-998510.1103/PhysRevC.102.024628] is implemented in the R-matrix code azure2 and calculations are compared with previous data from the literature for the N15(p,α1γ)C∗12 reaction. In addition, new measurements, made at the University of Notre Dame Nuclear Science Laboratory using the Hybrid Array of Gamma Ray Detectors (HAGRiD), are reported that span the energy range from Ep=0.88 MeV to Ep=4.0MeV. Excellent agreement between the data and the phenomenological fit is obtained up to the limit of the previous fit at Ep=2.0MeV and the R-matrix fit is extended from Ex≈13.5 MeV up to Ex≈15.3 MeV, where N15+p and C12+α reactions are fit simultaneously for the first time. An excellent reproduction of the N15(p,α1γ)C∗12 and C12(α,α)C12 data is achieved, but inconsistencies and difficulty in fitting other data are encountered and discussed.

Original language	English
Article number	065801
Journal	Physical Review C
Volume	103
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.103.065801
State	Published - Jun 2021

Funding

This research utilized resources from the Notre Dame Center for Research Computing and was supported by the National Science Foundation through Grant No. Phys-0758100 and the Joint Institute for Nuclear Astrophysics through Grant Nos. Phys-0822648 and PHY-1430152 (JINA Center for the Evolution of the Elements). The work at Ohio University was supported in part by the U.S. Department of Energy, under Grants No. DE-FG02-88ER40387 and No. DE-NA0003883. A portion of this work was supported by the U.S. Department of Energy under Grant No. DE-FG02-96ER40963 and the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Cooperative Agreement DE-NA002132.

Funders	Funder number
Joint Institute for Nuclear Astrophysics	PHY-1430152, Phys-0822648
National Science Foundation	Phys-0758100
U.S. Department of Energy	DE-FG02-88ER40387, DE-NA0003883, DE-FG02-96ER40963, DE-NA002132
National Nuclear Security Administration
Ohio University

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10.1103/PhysRevC.103.065801

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Deboer, R. J., Boeltzig, A., Macon, K. T., Aguilar, S., Gomez, O., Frentz, B., Henderson, S. L., Kelmar, R., Renaud, M., Seymour, G., Kolk, B. V., Wiescher, M., Brune, C. R., Burcher, S. P., Jones, K. L., Kovoor, J. M., Febbraro, M., Imbriani, G., Mosby, S., ... Toomey, R. (2021). Investigation of secondary γ -ray angular distributions using the N 15 (p,α1γ) C ∗ 12 reaction. Physical Review C, 103(6), Article 065801. https://doi.org/10.1103/PhysRevC.103.065801

@article{de3c1e898f0047fea4502c9f7c1c25b9,

title = "Investigation of secondary γ -ray angular distributions using the N 15 (p,α1γ) C ∗ 12 reaction",

abstract = "The observation of secondary γ-rays provides an alternative method of measuring cross sections that populate excited final states in nuclear reactions. The angular distributions of these γ-rays also provide information on the underlying reaction mechanism. Despite the large number of data of this type in the literature, publicly available R-matrix codes do not have the ability to calculate these types of angular distributions. In this paper, the mathematical formalism derived by C. R. Brune and R. J. deBoer [Phys. Rev. C 102, 024628 (2020)2469-998510.1103/PhysRevC.102.024628] is implemented in the R-matrix code azure2 and calculations are compared with previous data from the literature for the N15(p,α1γ)C∗12 reaction. In addition, new measurements, made at the University of Notre Dame Nuclear Science Laboratory using the Hybrid Array of Gamma Ray Detectors (HAGRiD), are reported that span the energy range from Ep=0.88 MeV to Ep=4.0MeV. Excellent agreement between the data and the phenomenological fit is obtained up to the limit of the previous fit at Ep=2.0MeV and the R-matrix fit is extended from Ex≈13.5 MeV up to Ex≈15.3 MeV, where N15+p and C12+α reactions are fit simultaneously for the first time. An excellent reproduction of the N15(p,α1γ)C∗12 and C12(α,α)C12 data is achieved, but inconsistencies and difficulty in fitting other data are encountered and discussed.",

author = "Deboer, {R. J.} and A. Boeltzig and Macon, {K. T.} and S. Aguilar and O. Gomez and B. Frentz and Henderson, {S. L.} and R. Kelmar and M. Renaud and G. Seymour and Kolk, {B. Vande} and M. Wiescher and Brune, {C. R.} and Burcher, {S. P.} and Jones, {K. L.} and Kovoor, {J. M.} and M. Febbraro and G. Imbriani and S. Mosby and K. Smith and R. Toomey",

note = "Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = jun,

doi = "10.1103/PhysRevC.103.065801",

language = "English",

volume = "103",

journal = "Physical Review C",

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Deboer, RJ, Boeltzig, A, Macon, KT, Aguilar, S, Gomez, O, Frentz, B, Henderson, SL, Kelmar, R, Renaud, M, Seymour, G, Kolk, BV, Wiescher, M, Brune, CR, Burcher, SP, Jones, KL, Kovoor, JM, Febbraro, M, Imbriani, G, Mosby, S, Smith, K & Toomey, R 2021, 'Investigation of secondary γ -ray angular distributions using the N 15 (p,α1γ) C ∗ 12 reaction', Physical Review C, vol. 103, no. 6, 065801. https://doi.org/10.1103/PhysRevC.103.065801

TY - JOUR

T1 - Investigation of secondary γ -ray angular distributions using the N 15 (p,α1γ) C ∗ 12 reaction

AU - Deboer, R. J.

AU - Boeltzig, A.

AU - Macon, K. T.

AU - Aguilar, S.

AU - Gomez, O.

AU - Frentz, B.

AU - Henderson, S. L.

AU - Kelmar, R.

AU - Renaud, M.

AU - Seymour, G.

AU - Kolk, B. Vande

AU - Wiescher, M.

AU - Brune, C. R.

AU - Burcher, S. P.

AU - Jones, K. L.

AU - Kovoor, J. M.

AU - Febbraro, M.

AU - Imbriani, G.

AU - Mosby, S.

AU - Smith, K.

AU - Toomey, R.

PY - 2021/6

Y1 - 2021/6

N2 - The observation of secondary γ-rays provides an alternative method of measuring cross sections that populate excited final states in nuclear reactions. The angular distributions of these γ-rays also provide information on the underlying reaction mechanism. Despite the large number of data of this type in the literature, publicly available R-matrix codes do not have the ability to calculate these types of angular distributions. In this paper, the mathematical formalism derived by C. R. Brune and R. J. deBoer [Phys. Rev. C 102, 024628 (2020)2469-998510.1103/PhysRevC.102.024628] is implemented in the R-matrix code azure2 and calculations are compared with previous data from the literature for the N15(p,α1γ)C∗12 reaction. In addition, new measurements, made at the University of Notre Dame Nuclear Science Laboratory using the Hybrid Array of Gamma Ray Detectors (HAGRiD), are reported that span the energy range from Ep=0.88 MeV to Ep=4.0MeV. Excellent agreement between the data and the phenomenological fit is obtained up to the limit of the previous fit at Ep=2.0MeV and the R-matrix fit is extended from Ex≈13.5 MeV up to Ex≈15.3 MeV, where N15+p and C12+α reactions are fit simultaneously for the first time. An excellent reproduction of the N15(p,α1γ)C∗12 and C12(α,α)C12 data is achieved, but inconsistencies and difficulty in fitting other data are encountered and discussed.

AB - The observation of secondary γ-rays provides an alternative method of measuring cross sections that populate excited final states in nuclear reactions. The angular distributions of these γ-rays also provide information on the underlying reaction mechanism. Despite the large number of data of this type in the literature, publicly available R-matrix codes do not have the ability to calculate these types of angular distributions. In this paper, the mathematical formalism derived by C. R. Brune and R. J. deBoer [Phys. Rev. C 102, 024628 (2020)2469-998510.1103/PhysRevC.102.024628] is implemented in the R-matrix code azure2 and calculations are compared with previous data from the literature for the N15(p,α1γ)C∗12 reaction. In addition, new measurements, made at the University of Notre Dame Nuclear Science Laboratory using the Hybrid Array of Gamma Ray Detectors (HAGRiD), are reported that span the energy range from Ep=0.88 MeV to Ep=4.0MeV. Excellent agreement between the data and the phenomenological fit is obtained up to the limit of the previous fit at Ep=2.0MeV and the R-matrix fit is extended from Ex≈13.5 MeV up to Ex≈15.3 MeV, where N15+p and C12+α reactions are fit simultaneously for the first time. An excellent reproduction of the N15(p,α1γ)C∗12 and C12(α,α)C12 data is achieved, but inconsistencies and difficulty in fitting other data are encountered and discussed.

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Investigation of secondary γ -ray angular distributions using the N 15 (p,α1γ) C ∗ 12 reaction

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