Investigation of secondary γ -ray angular distributions using the N15(p,α1γ)C*12 reaction

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. Vande; Wiescher, M.; Brune, C. R.; Burcher, S. P.; Jones, K. L.; Kovoor, J. M.; Febbraro, M.; Imbriani, G.; Mosby, S.; Smith, K.; Toomey, R.

doi:10.1103/physrevc.103.065801

Title: Investigation of secondary γ -ray angular distributions using the N 15 ( p , α 1 γ ) C * 12 reaction

Journal Article · 13 June 2021 · Physical Review. C

DOI: https://doi.org/10.1103/physrevc.103.065801 · OSTI ID:1871153

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University of Notre Dame, IN (United States). Joint Institute for Nuclear Astrophysics; Rutgers University
University of Notre Dame, IN (United States). Joint Institute for Nuclear Astrophysics
Ohio Univ., Athens, OH (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Istituto Nazionale di Fisica Nucleare (INFN), Napoli (Italy); Univ. degli Studi di Napoli Federico II (Italy)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Rutgers Univ., New Brunswick, NJ (United States)

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 a large amount 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 report, the mathematical formalism derived in Brune and deBoer is implemented in the R-matrix code AZURE2 and calculations are compared with previous data from the literature for the ¹⁵N(_{p, α1γ}) ¹²C* 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 an energy range from E_p = 0.88 to 4.0 MeV. Excellent agreement between data and the phenomenological fit is obtained up to the limit of the previous fit at E_p = 2.0 MeV and the R-matrix fit is extended from E_x ≈ 13.5 up to E_x ≈ 15.3 MeV, where ¹⁵N+p and ¹²C+α reactions are fit simultaneously for the first time. An excellent reproduction of the ¹⁵N(_{p, α1γ}) ¹²C* and ¹²C(α, α) ¹²C data is achieved, but inconsistencies and difficulty in fitting other data is encountered and discussed.

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Research Organization:: University of Notre Dame, IN (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: FG02-88ER40387; NA0003897

OSTI ID:: 1871153

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 103; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Investigation of secondary γ -ray angular distributions using the N 15 ( p , α 1 γ ) C * 12 reaction

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