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NSR database version of April 11, 2024.

Search: Author = R.J.deBoer

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2024DE04      Phys.Rev.Lett. 132, 062702 (2024)

R.J.deBoer, M.Febbraro, D.W.Bardayan, C.Boomershine, K.Brandenburg, C.Brune, S.Coil, M.Couder, J.Derkin, S.Dede, R.Fang, A.Fritsch, A.Gula, Gy.Gyurky, B.Hackett, G.Hamad, Y.Jones-Alberty, R.Kelmar, K.Manukyan, M.Matney, J.McDonaugh, Z.Meisel, S.Moylan, J.Nattress, D.Odell, P.O'Malley, M.W.Paris, D.Robertson, Shahina, N.Singh, K.Smith, M.S.Smith, E.Stech, W.Tan, M.Wiescher

Measurement of the 13C(α, n0)16O Differential Cross Section from 0.8 to 6.5 MeV

NUCLEAR REACTIONS 13C(α, n), E=0.8-6.5 MeV; measured reaction products, En, IN; deduced σ(θ), σ, S-factor. Comparison with available data, R-matrix results from ENDF/B-VIII.0 library. The Oak Ridge National Laboratory Deuterated Spectroscopic Array (ODeSA), 5 MV Stable ion Accelerator for Nuclear Astrophysics, the University of Notre Dame Nuclear Science Laboratory.

doi: 10.1103/PhysRevLett.132.062702
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2023BO19      Phys.Rev. C 108, 035809 (2023)

T.C.Borgwardt, R.J.deBoer, A.Boeltzig, M.Couder, J.Gorres, Au.Gula, M.Hanhardt, K.V.Manukyan, T.Kadlecek, D.Robertson, F.Strieder, M.Wiescher

Deep underground measurement of 11B(α, n)14N

doi: 10.1103/PhysRevC.108.035809
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2023BR13      Phys.Rev. C 108, L061601 (2023)

K.Brandenburg, G.Hamad, Z.Meisel, C.R.Brune, D.E.Carter, R.J.deBoer, J.Derkin, C.Feathers, D.C.Ingram, Y.Jones-Alberty, B.Kenady, T.N.Massey, M.Saxena, D.Soltesz, S.K.Subedi, A.V.Voinov, J.Warren, M.Wiescher

Measurements of the 13C(α, n)16O cross section up to Eα=8 MeV

doi: 10.1103/PhysRevC.108.L061601
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2023GU04      Phys.Rev. C 107, 025805 (2023)

A.Gula, R.J.deBoer, S.Aguilar, J.Arroyo, C.Boomershine, B.Frentz, J.Gorres, S.Henderson, R.Kelmar, S.McGuinness, K.V.Manukyan, S.Moylan, D.Robertson, C.Seymour, Shahina, E.Stech, W.Tan, J.Wilkinson, M.Wiescher

10B + α reactions at low energies

NUCLEAR REACTIONS 10B(α, p), (α, d), E(cm)=186-1430 keV; measured Ep, Ip, deuteron spectrum; deduced σ(θ) for (α, p0), (α, p1), (α, p2), (α, p3) and (α, d) channels, resonances, astrophysical reaction rate (T=0.01-2 GK), S-factor. 10B(α, α), (α, n), (α, p), (α, d); analyzed present and previous experimental data for σ(θ) distributions by R-matrix formalism using AZURE2 code. 10B(α, n), E(cm)=0.21-1.42 MeV; deduced astrophysical reaction rate (T=0.01-2 GK). 14N; deduced resonances, J, π, decay widths. Comparison to previous experimental data. Target surrounded by 2 silicon surface barrier detectors (SSBD) detectors at Stable ion Accelerator for Nuclear Astrophysics (Univ. Notre Dame).

doi: 10.1103/PhysRevC.107.025805
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2023KE11      Phys.Rev. C 108, 035805 (2023)

K-U.Kettner, H.W.Becker, C.R.Brune, R.J.deBoer, J.Gorres, D.Odell, D.Rogalla, M.Wiescher

Absolute cross section of the 12C(p, γ)13N reaction

doi: 10.1103/PhysRevC.108.035805
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2023SC08      Phys.Rev. C 107, 065806 (2023)

P.Scholz, R.J.deBoer, J.Gorres, A.Gula, R.Kelmar, K.Manukyan, E.Stech, W.Tan, M.Wiescher

Measurement of 39K(p, γ)40Ca resonance strengths below 900 keV for nucleosynthesis in classical novae

NUCLEAR REACTIONS 39K(p, γ)40Ca, E=0.4, 1.4 MeV; measured Eγ, Iγ; deduced resonance strengths, astrophysical reaction rate (T=0.1-1.1 GK). 39K; lifetime under novae conditions. Comparison to previous experimental data and statistical model predictions (SAPPHIRE and NON-SMOKER codes). Single coaxial HPGe detector surrounded by BGO anti-Compton shield at 5U Pelletron accelerator of the Nuclear Science Laboratory (University of Notre Dame).

doi: 10.1103/PhysRevC.107.065806
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2023SH06      Astrophys.J. 945, 41 (2023)

Y.Shen, B.Guo, R.J.deBoer, E.Li, Z.Li, Y.Li, X.Tang, D.Pang, S.Adhikari, C.Basu, J.Su, S.Yan, Q.Fan, J.Liu, C.Chen, Z.Han, X.Li, G.Lian, T.Ma, W.Nan, W.Nan, Y.Wang, S.Zeng, H.Zhang, W.Liu

New Determination of the 12C(α, γ)16O Reaction Rate and Its Impact on the Black-hole Mass Gap

NUCLEAR REACTIONS 12C(11B, 7Li), (11B, 11B), E=50 MeV; measured reaction products. 16O; deduced σ(θ), the asymptotic normalization coefficient (ANC) for the 16O ground state (GS), astrophysical S-factor and the stellar rate. The HI-13 tandem accelerator of China Institute of Atomic Energy (CIAE) in Beijing, China.

doi: 10.3847/1538-4357/acb7de
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2023WI01      Eur.Phys.J. A 59, 11 (2023)

M.Wiescher, R.J.deBoer, J.Gorres

The resonances in the 22Ne+α fusion reactions

NUCLEAR REACTIONS 22Ne(α, n), (α, γ), E(cm)<4.5 MeV; analyzed available data; deduced σ, resonance parameters, S-factor using AZURE2 and SAPPHIRE, HF calculations. α-cluster and single-particle structure of the compound nucleus.

doi: 10.1140/epja/s10050-023-00917-9
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2022AL01      J.Phys.(London) G49, 010501 (2022)

M.Aliotta, R.Buompane, M.Couder, A.Couture, R.J.deBoer, A.Formicola, L.Gialanella, J.Glorius, G.Imbriani, M.Junker, C.Langer, A.Lennarz, Y.A.Litvinov, W.-P.Liu, M.Lugaro, C.Matei, Z.Meisel, L.Piersanti, R.Reifarth, D.Robertson, A.Simon, O.Straniero, A.Tumino, M.Wiescher, Y.Xu

The status and future of direct nuclear reaction measurements for stellar burning

NUCLEAR REACTIONS 12C(α, γ), 22Ne(α, n), (α, γ), 12C(12C, X), E(cm)<7 MeV; analyzed available data; deduced σ, S-factors.

doi: 10.1088/1361-6471/ac2b0f
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2022BO17      Phys.Rev. C 106, 045801 (2022)

A.Boeltzig, R.J.deBoer, Y.Chen, A.Best, M.Couder, A.Di Leva, B.Frentz, J.Gorres, Gy.Gyurky, G.Imbriani, M.Junker, Q.Liu, S.Lyons, K.Manukyan, K.T.Macon, L.Morales, M.T.Moran, D.Odell, C.Seymour, G.Seymour, E.Stech, B.Vande Kolk, M.Wiescher

Investigation of direct capture in the 23Na(p, γ)24Mg reaction

NUCLEAR REACTIONS 23Na(p, γ), E=0.5-1 MeV; measured Eγ, Iγ; deduced σ(E) for 8 γ-transitions, resonance energies and partial widths, asymptotic normalisation coefficients (ANC), S-factor, reaction rate. R-matrix analysis with AZURE2 code. Comparison to other experimental data and theoretical calculations. HPGe detector at Stable ion Accelerator for Nuclear Astrophysics (University of Notre Dame).

doi: 10.1103/PhysRevC.106.045801
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2022DE30      Phys.Rev. C 106, 055808 (2022)

R.J.deBoer, A.Gula, M.Febbraro, K.Brandenburg, C.R.Brune, J.Gorres, Gy.Gyurky, R.Kelmar, K.Manukyan, Z.Meisel, D.Odell, M.T.Pigni, Shahina, E.Stech, W.Tan, M.Wiescher

First near-threshold measurements of the 13C(α, n1)16O reaction for low-background-environment characterization

NUCLEAR REACTIONS 13C(α, n), E=5.0-5.57 MeV; measured En, In, angular distributions; deduced σ(θ, E) for α, n1 channel. R-matrix analysis with AZURE2 code. Uncertainty estimation with Bayesian R-matrix Inference Code Kit (BRICK). Comparison to the previous estimates of σ for α, ν1a channel, other experimental results for total σ and statistical model calculations. 3He-spectrometer at Stable ion Accelerator for Nuclear Astrophysics (University of Notre Dame).

doi: 10.1103/PhysRevC.106.055808
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2022FR09      Phys.Rev. C 106, 065803 (2022)

B.Frentz, A.Aprahamian, A.Boeltzig, T.Borgwardt, A.M.Clark, R.J.deBoer, G.Gilardy, J.Gorres, M.Hanhardt, S.L.Henderson, K.B.Howard, T.Kadlecek, Q.Liu, K.T.Macon, S.Moylan, C.S.Reingold, D.Robertson, C.Seymour, S.Y.Strauss, F.Strieder, B.Vande Kolk, M.Wiescher

Investigation of the 14N(p, γ)15O reaction and its impact on the CNO cycle

NUCLEAR REACTIONS 14N(p, γ), E=0.27-1.07 MeV; measured Eγ, Iγ; deduced σ(θ, E) for particular transitions in daughter nuclei, astrophysical differential and total S-factor, astrophysical reaction rate for T=0.01-10 GK. Multichannel R-matrix analysis for the transition to the ground state, the excited states at 6.17 and 6.79 MeV, as well as 14N(p, p) differential scattering data. Discussed implication of the obtained data on the CNO neutrino production. Comparison to other experimental results. Single coaxial HPGe detector. Beam from 1 MV JN Van de Graaff at the Compact Accelerator System for Performing Astrophysical Research (CASPAR) at the Sanford Underground Research Facility.

doi: 10.1103/PhysRevC.106.065803
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2022GU23      Phys.Rev. C 106, 065801 (2022)

A.Gula, R.J.deBoer, R.Kelmar, J.Gorres, K.V.Manukyan, E.Stech, W.Tan, M.Wiescher

Excitation function for the 6Li + α reaction between 0.5 and 1.4 MeV

NUCLEAR REACTIONS 6Li(α, γ), E=460-1400 keV; measured Eγ, Iγ; deduced excitation functions, resonances, reaction rates for T=0.001-9.94 GK, narrow resonance contributions to the reaction rate. 10B; resonances, decay widths, branching ratios. R-matrix analysis with AZURE2 code. Comparison to other experimental data. CeBr3 single detector. Beam from 5U Pelletron accelerator at the University of Notre Dame.

doi: 10.1103/PhysRevC.106.065801
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2022KA10      Phys.Rev. C 105, 024609 (2022)

G.Kaur, V.Guimaraes, J.C.Zamora, M.Assuncao, J.Alcantara-Nunez, A.L.de Lara, E.O.N.Zevallos, J.B.Ribeiro, R.Lichtenthaler, K.C.C.Pires, O.C.B.Santos, V.Morcelle, R.J.deBoer

New resonances in 11C above the 10B + p threshold investigated by inverse kinematic resonant scattering

NUCLEAR REACTIONS 1H(10B, p), E=37.2 MeV; measured reaction products, Ep, Ip, angular distributions; deduced σ, σ(θ). 11C; deduced resonances, J, π, widths. R-matrix analysis. Comparison of level structure to 11B mirror nucleus. Beam from Radioactive Ion Beams in Brazil (RIBRAS) facility.

doi: 10.1103/PhysRevC.105.024609
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2022KA39      XLIV Brazilian Meeting on Nuclear Physics, Brazil, 9-11 Nov 2021 p.012042 (2022); J.Phys.:Conf.Ser. 2340

G.Kaur, V.Guimaraes, J.C.Zamora, M.Assuncao, J.Alcantara-Nunez, A.L.de Lara, E.O.N.Zevallos, J.B.Ribeiro, R.Lichtenthaler, K.C.C.Pires, O.C.B.Santos, V.Morcelle, R.J.deBoer

Resonant scattering measurement for 11C using thick target in inverse kinematics

NUCLEAR REACTIONS 1H(10B, α), (10B, 3He), (10B, X)11C, E=35.93 MeV; measured reaction products; deduced σ(θ). RIBRAS facility, IFUSP, Sao Paulo.

doi: 10.1088/1742-6596/2340/1/012042
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2022SC17      J.Phys.(London) G49, 110502 (2022)

H.Schatz, A.D.Becerril Reyes, A.Best, E.F.Brown, K.Chatziioannou, K.A.Chipps, C.M.Deibel, R.Ezzeddine, D.K.Galloway, C.J.Hansen, F.Herwig, A.P.Ji, M.Lugaro, Z.Meisel, D.Norman, J.S.Read, L.F.Roberts, A.Spyrou, I.Tews, F.X.Timmes, C.Travaglio, N.Vassh, C.Abia, P.Adsley, S.Agarwal, M.Aliotta, W.Aoki, A.Arcones, A.Aryan, A.Bandyopadhyay, A.Banu, D.W.Bardayan, J.Barnes, A.Bauswein, T.C.Beers, J.Bishop, T.Boztepe, B.Cote, M.E.Caplan, A.E.Champagne, J.A.Clark, M.Couder, A.Couture, S.E.de Mink, S.Debnath, R.J.deBoer, J.den Hartogh, P.Denissenkov, V.Dexheimer, I.Dillmann, J.E.Escher, M.A.Famiano, R.Farmer, R.Fisher, C.Frohlich, A.Frebel, C.Fryer, G.Fuller, A.K.Ganguly, S.Ghosh, B.K.Gibson, T.Gorda, K.N.Gourgouliatos, V.Graber, M.Gupta, W.C.Haxton, A.Heger, W.R.Hix, W.C.G.Ho, E.M.Holmbeck, A.A.Hood, S.Huth, G.Imbriani, R.G.Izzard, R.Jain, H.Jayatissa, Z.Johnston, T.Kajino, A.Kankainen, G.G.Kiss, A.Kwiatkowski, M.La Cognata, A.M.Laird, L.Lamia, P.Landry, E.Laplace, K.D.Launey, D.Leahy, G.Leckenby, A.Lennarz, B.Longfellow, A.E.Lovell, W.G.Lynch, S.M.Lyons, K.Maeda, E.Masha, C.Matei, J.Merc, B.Messer, F.Montes, A.Mukherjee, M.R.Mumpower, D.Neto, B.Nevins, W.G.Newton, L.Q.Nguyen, K.Nishikawa, N.Nishimura, F.M.Nunes, E.O'Connor, B.W.O'Shea, W.-J.Ong, S.D.Pain, M.A.Pajkos, M.Pignatari, R.G.Pizzone, V.M.Placco, T.Plewa, B.Pritychenko, A.Psaltis, D.Puentes, Y.-Z.Qian, D.Radice, D.Rapagnani, B.M.Rebeiro, R.Reifarth, A.L.Richard, N.Rijal, I.U.Roederer, J.S.Rojo, J.S K, Y.Saito, A.Schwenk, M.L.Sergi, R.S.Sidhu, A.Simon, T.Sivarani, A.Skuladottir, M.S.Smith, A.Spiridon, T.M.Sprouse, S.Starrfield, A.W.Steiner, F.Strieder, I.Sultana, R.Surman, T.Szucs, A.Tawfik, F.Thielemann, L.Trache, R.Trappitsch, M.B.Tsang, A.Tumino, S.Upadhyayula, J.O.Valle Martinez, M.Van der Swaelmen, C.Viscasillas Vazquez, A.Watts, B.Wehmeyer, M.Wiescher, C.Wrede, J.Yoon, R.G.T.Zegers, M.A.Zermane, M.Zingale, the Horizon 2020 Collaborations

Horizons: nuclear astrophysics in the 2020s and beyond

doi: https://dx.doi.org/10.1088/1361-6471/ac8890
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2022SI17      Phys.Rev. C 106, 015803 (2022)

A.Sieverding, J.S.Randhawa, D.Zetterberg, R.J.deBoer, T.Ahn, R.Mancino, G.Martinez-Pinedo, W.R.Hix

Role of low-lying resonances for the 10Be(p, α)7Li reaction rate and implications for the formation of the Solar System

NUCLEAR REACTIONS 10Be(p, α), (α, n), E not given; 10Be(ν, e-), E=2.8-10 MeV; analyzed reaction rates, σ; deduced influence on the content of 10Be in supernovae environment. 10Be(p, α), E<1.5 MeV; analyzed reaction rate, experimental data on resonance in 11B at 193 keV, ; deduced reaction rate, astrophysical S-factor. Showed that, with the new reaction rate, a low-mass corecollapse supernovae is unlikely to produce enough 10Be to explain the observed 10Be/9Be ratio in meteorites. Comparison to data from JINA-REACLIB.

doi: 10.1103/PhysRevC.106.015803
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2022VA04      Phys.Rev. C 105, 055802 (2022)

B.Vande Kolk, K.T.Macon, R.J.deBoer, T.Anderson, A.Boeltzig, K.Brandenburg, C.R.Brune, Y.Chen, A.M.Clark, T.Danley, B.Frentz, R.Giri, J.Gorres, M.Hall, S.L.Henderson, E.Holmbeck, K.B.Howard, D.Jacobs, J.Lai, Q.Liu, J.Long, K.Manukyan, T.Massey, M.Moran, L.Morales, D.Odell, P.O'Malley, S.N.Paneru, A.Richard, D.Schneider, M.Skulski, N.Sensharma, C.Seymour, G.Seymour, D.Soltesz, S.Strauss, A.Voinov, L.Wustrich, M.Wiescher

Investigation of the 10B (p, α)7Be reaction from 0.8 to 2.0 MeV

NUCLEAR REACTIONS 10B(p, α), (p, p), E=0.8-2.0 MeV; measured Eα, Iα, Ep, Ip; deduced σ(θ), σ(E) S-factor, resonance parameters of 10B+p system - energy, spin, partial (p0, α0, α1) and total width. 10B(p, γ), E=0 .1-2.0 MeV; deduced σ(θ). 11C; deduced levels, J, π. R-matrix analysis. Measurements were made at the University of Notre Dame (UND) Nuclear Science Laboratory (NSL) using a degrader foil method, while those at the Edwards AcceleratorLaboratory at Ohio University (OU) were performed using the time-of-flight (ToF)technique. Comparison with other experimental data.

doi: 10.1103/PhysRevC.105.055802
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2767. Data from this article have been entered in the XUNDL database. For more information, click here.


2022ZH60      Nature(London) 610, 656 (2022)

L.Zhang, J.He, R.J.deBoer, M.Wiescher, A.Heger, D.Kahl, J.Su, D.Odell, Y.Chen, X.Li, J.Wang, L.Zhang, F.Cao, H.Zhang, Z.Zhang, X.Jiang, L.Wang, Z.Li, L.Song, H.Zhao, L.Sun, Q.Wu, J.Li, B.Cui, L.Chen, R.Ma, E.Li, G.Lian, Y.D.Sheng, Z.Li, B.Guo, X.Zhou, Y.Zhang, H.Xu, J.Cheng, W.Liu

Measurement of 19F(p, γ)20Ne reaction suggests CNO breakout in first stars

NUCLEAR REACTIONS 19F(p, γ), E(cm)<400 keV; measured reaction products, Eγ, Iγ; deduced yields, S-factor, resonance strengths, astrophysical reaction rates. Comparison with available data. The Jinping Underground Nuclear Astrophysics Experiment (JUNA).

doi: 10.1038/s41586-022-05230-x
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2022ZH67      Phys.Rev. C 106, 055803 (2022)

L.Y.Zhang, J.Su, J.J.He, R.J.deBoer, D.Kahl, M.Wiescher, D.Odell, Y.J.Chen, X.Y.Li, J.G.Wang, L.Zhang, F.Q.Cao, H.Zhang, Z.C.Zhang, T.Y.Jiao, Y.D.Sheng, L.H.Wang, L.Y.Song, X.Z.Jiang, Z.M.Li, E.T.Li, S.Wang, G.Lian, Z.H.Li, B.Guo, X.D.Tang, L.T.Sun, Q.Wu, J.Q.Li, B.Q.Cui, L.H.Chen, R.G.Ma, N.C.Qi, W.L.Sun, X.Y.Guo, P.Zhang, Y.H.Chen, Y.Zhou, J.F.Zhou, J.R.He, C.S.Shang, M.C.Li, J.P.Cheng, W.P.Liu

Direct measurement of the astrophysical 19F(p, αγ)16O reaction in a deep-underground laboratory

NUCLEAR REACTIONS 19F(p, αγ), E(cm)=72.4-344 keV; measured Eγ, Iγ; deduced astrophysical S-factor, thermonuclear astrophysical reaction rates (range 0.05–1 GK), contributions from different channels. R-matrix analysis with AZURE2 together with a MCMC Bayesian uncertainty estimation. Comparison to other experimental data. 4π BGO γ-array with proton beam from JUNA accelerator at China JinPing underground Laboratory (CJPL).

doi: 10.1103/PhysRevC.106.055803
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2021CH16      Phys.Rev. C 103, 035809 (2021)

Y.Chen, G.P.A.Berg, R.J.deBoer, J.Gorres, H.Jung, A.Long, K.Seetedohnia, R.Talwar, M.Wiescher, S.Adachi, H.Fujita, Y.Fujita, K.Hatanaka, C.Iwamoto, B.Liu, S.Noji, H.-J.Ong, A.Tamii

Neutron transfer studies on 25Mg and its correlation to neutron radiative capture processes

NUCLEAR REACTIONS 25Mg(d, p)26Mg, E=56 MeV; measured E(p), I(p), σ(θ) using Grand Raiden (GR) spectrometer at the RCNP, AVF cyclotron facility. 26Mg; deduced levels, J, π, L-transfers, spectroscopic factors, and compared with previous experimental results for levels populated in (d, p) and (n, γ) reactions. 25Mg(n, γ)26Mg, E<275 keV; deduced σ(E) using the structure parameters such as level energies and widths from surrogate (d, p) neutron transfer reaction and R-matrix analysis. Relevance to proton-induced nucleosynthesis in the CNO cycles and the rp process.

doi: 10.1103/PhysRevC.103.035809
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2691. Data from this article have been entered in the XUNDL database. For more information, click here.


2021DE13      Phys.Rev. C 103, 055815 (2021)

R.J.deBoer, O.Clarkson, A.J.Couture, J.Gorres, F.Herwig, I.Lombardo, P.Scholz, M.Wiescher

19F(p, γ)20Ne and 19F(p, αγ)16O reaction rates and their effect on calcium production in Population III stars from hot CNO breakout

NUCLEAR REACTIONS 19F(p, αγ)16O, E(cm)<865 keV; 19F(p, p), E(cm)=0.5-0.9 MeV; analyzed and evaluated available experimental data for σ(E, θ), differential S factors, angular distributions, R-matrix fit to secondary γ-ray data, secondary on-resonance γ-ray angular distributions. 16O; deduced levels, resonance energies, J, π, Γp, Γα, Γγ. 19F(p, γ)20Ne, E(cm)<0.8 MeV; analyzed and evaluated experimental data for S factor. 20Ne; deduced levels, resonance energies, J, π, resonance strengths, Γp, Γγ, Γα, Γtotal. 19F(p, γ)20Ne, 19F(p, αγ)16O, T=0.01-1 GK; recommended astrophysical reaction rates, and compared with compilation in NACRE database. Phenomenological R-matrix approach. Discussed astrophysical impact of the evaluated data, and recommended further measurements of importance, for example proton transfer studies needed to determine the proton ANCs of proton bound states. Relevance to the presence of Ca in Fe-poor stars in hot CNO breakout H-burning nucleosynthesis.

doi: 10.1103/PhysRevC.103.055815
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2021DE17      Phys.Rev. C 103, 065801 (2021)

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

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

NUCLEAR REACTIONS 15N(p, αγ)12C*, E=0.88-4.0 MeV; measured Eγ, Iγ, angular distributions using Hybrid Array of LaBr3(Ce) Gamma Ray Detectors (HAGRiD) at the 5-MV Santa Ana accelerator of University of Notre Dame; deduced σ(E), σ(θ) distributions. 15N(p, αγ)12C*; 12C(α, α), (α, α'); analyzed present and previous experimental data for σ(θ) distributions by R-matrix formalism using AZURE2 code. Discussed inconsistencies and difficulty in fitting previous data. Detailed cross section data for both the reactions listed in the Supplemental Material.

doi: 10.1103/PhysRevC.103.065801
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2021FR05      Phys.Rev. C 103, 045802 (2021)

B.Frentz, A.Aprahamian, A.M.Clark, R.J.deBoer, C.Dulal, J.D.Enright, J.Gorres, S.L.Henderson, J.D.Hinnefeld, K.B.Howard, R.Kelmar, K.Lee, L.Morales, S.Moylan, Z.Rahman, W.Tan, L.E.Weghorn, M.Wiescher

Lifetime measurements of excited states in 15O

NUCLEAR REACTIONS 14N(p, γ)15O, E=1020, 1570 keV; measured Eγ, Iγ, half-lives of 5.18-, 6.17- and 6.79-MeV levels in 15O by Doppler-shift attenuation method (DSAM) using three separate, nitrogen-implanted targets with Mo, Ta, and W backings at the Nuclear Science Laboratory (NSL) of University of Notre Dame. Comparison with previous half-life measurements. Monte Carlo simulations of Doppler-shift attenuation factors. R-matrix analysis of asymptotic normalization constants (ANCs) and radiative widths Γγ using AZURE2 code for g.s. and levels between 6793 and 9609 keV, including half-lives measured in the present work and experimental data in literature. Relevance to CNO chain of reactions and uncertainty in the 14N(p, γ)15O reaction rate.

doi: 10.1103/PhysRevC.103.045802
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2021WI02      Eur.Phys.J. A 57, 24 (2021)

M.Wiescher, O.Clarkson, R.J.deBoer, P.Denisenkov

Nuclear clusters as the first stepping stones for the chemical evolution of the universe

NUCLEAR REACTIONS 6,7Li(α, γ), E(cm)<2.5 MeV; 10B(α, n), (α, d), E(cm)<1.2 MeV; analyzed available data; deduced σ, σ(θ), reaction rates.

doi: 10.1140/epja/s10050-020-00339-x
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2021ZH53      Phys.Rev.Lett. 127, 152702 (2021)

L.Y.Zhang, J.Su, J.J.He, M.Wiescher, R.J.deBoer, D.Kahl, Y.J.Chen, X.Y.Li, J.G.Wang, L.Zhang, F.Q.Cao, H.Zhang, Z.C.Zhang, T.Y.Jiao, Y.D.Sheng, L.H.Wang, L.Y.Song, X.Z.Jiang, Z.M.Li, E.T.Li, S.Wang, G.Lian, Z.H.Li, X.D.Tang, H.W.Zhao, L.T.Sun, Q.Wu, J.Q.Li, B.Q.Cui, L.H.Chen, R.G.Ma, B.Guo, S.W.Xu, J.Y.Li, N.C.Qi, W.L.Sun, X.Y.Guo, P.Zhang, Y.H.Chen, Y.Zhou, J.F.Zhou, J.R.He, C.S.Shang, M.C.Li, X.H.Zhou, Y.H.Zhang, F.S.Zhang, Z.G.Hu, H.S.Xu, J.P.Chen, W.P.Liu

Direct Measurement of the Astrophysical 19F(p, αγ)16O Reaction in the Deepest Operational Underground Laboratory

NUCLEAR REACTIONS 19F(p, α), E(cm)=72.4-188.8 keV; measured reaction products, Eγ, Iγ; deduced yields, S-factors, reaction rates. The China Jinping Underground Laboratory (CJPL), JUNA accelerator.

doi: 10.1103/physrevlett.127.152702
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2020AH03      Phys.Rev. C 102, 035805 (2020)

T.Ahn, S.Aguilar, R.J.deBoer, D.W.Bardayan, A.Boeltzig, C.R.Brune, S.P.Burcher, K.Y.Chae, S.L.Henderson, R.K.Grzywacz, K.L.Jones, J.M.Kovoor, K.T.Macon, K.Manukyan, S.Mosby, P.D.O'Malley, M.Renaud, K.Smith, C.Thornsberry, B.Vande Kolk, M.Wiescher

Cross-section measurements to low-lying excited final states in the 24Mg(α, p)27Al*(γ) reaction as an energy source for x-ray bursts

NUCLEAR REACTIONS 24Mg(α, p)27Al*, E=4.0-5.4 MeV; measured Eγ, Iγ, γ(θ) for γ rays emitted by resonances in 27Al using an array of 13 LaBr3 detectors from the Hybrid Array of Gamma Ray Detectors (HAGRiD) and enriched target at the ANA accelerator at the University of Notre Dame; deduced yields for resonances in 27Al, integrated angular yields for resonances in 27Al for (α, p1) and (α, p2) channels, astrophysical reaction rates from 1-10 GK. Relevance to energy production in type Ia x-ray bursts. The γ rays also seen from 24Mg(α, a°), 24Mg(α, n)20Ne, and 24Mg(α, γ)28Si.

doi: 10.1103/PhysRevC.102.035805
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2020BR10      Phys.Rev. C 102, 024628 (2020)

C.R.Brune, R.J.deBoer

Secondary γ-ray decays from the partial-wave T matrix with an R-matrix application to 15N(p, α1γ)12C

NUCLEAR REACTIONS 15N(p, αγ)12C, E=0.9-1.25 MeV; calculated total σ(E) and γ-ray angular distribution coefficients by partial-wave T-matrix elements. Comparison with experimental data where data analyzed by R-matrix using AZURE2 code.

doi: 10.1103/PhysRevC.102.024628
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2020DE12      Phys.Rev. C 101, 045802 (2020)

R.J.deBoer, C.R.Brune, M.Febrarro, J.Gorres, I.J.Thompson, M.Wiescher

Sensitivity of the 13C(α, n)16O S factor to the uncertainty in the level parameters of the near-threshold state

NUCLEAR REACTIONS 13C(α, n)16O, E(cm)<1.2 MeV; calculated astrophysical S factors and reaction rates by R-matrix theory using the AZURE2 code for different sets of level parameters for the near-threshold 1/2+ resonance at 6356 keV in 17O; analyzed theory and available experimental data to investigate the sensitivity of the low-energy extrapolation to the associated uncertainties and discrepancies. Relevance to s process in asymptotic giant branch (AGB) stars and i process in carbon-enhanced metal-poor (CEMP) stars.

doi: 10.1103/PhysRevC.101.045802
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2020FE06      Phys.Rev.Lett. 125, 062501 (2020)

M.Febbraro, R.J.deBoer, S.D.Pain, R.Toomey, F.D.Becchetti, A.Boeltzig, Y.Chen, K.A.Chipps, M.Couder, K.L.Jones, E.Lamere, Q.Liu, S.Lyons, K.T.Macon, L.Morales, W.A.Peters, D.Robertson, B.C.Rasco, K.Smith, C.Seymour, G.Seymour, M.S.Smith, E.Stech, B.Vande Kolk, M.Wiescher

New 13C(α, n)16O Cross Section with Implications for Neutrino Mixing and Geoneutrino Measurements

NUCLEAR REACTIONS 13C(α, n), E=5.2-6.4 MeV; measured reaction products, Eγ, Iγ; deduced σ. Comparison with experimental data, JENDL and ENDF/B evaluated libraries.

doi: 10.1103/PhysRevLett.125.062501
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2020GU11      Phys.Lett. B 806, 135473 (2020)

Y.K.Gupta, B.K.Nayak, U.Garg, K.Hagino, K.B.Howard, N.Sensharma, M.Senyigit, W.P.Tan, P.D.O'Malley, M.Smith, R.Gandhi, T.Anderson, R.J.deBoer, B.Frentz, A.Gyurjinyan, O.Hall, M.R.Hall, J.Hu, E.Lamere, Q.Liu, A.Long, W.Lu, S.Lyons, K.Ostdiek, C.Seymour, M.Skulski, B.Vande Kolk

Determination of hexadecapole (β4) deformation of the light-mass nucleus 24Mg using quasi-elastic scattering measurements

NUCLEAR REACTIONS 90Zr(16O, 16O), (24Mg, 24Mg), E=61 MeV; measured reaction products. 24Mg; deduced deformation parameters, σ, B(Eλ). CCFULL calculations.

doi: 10.1016/j.physletb.2020.135473
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2020LI08      Phys.Rev. C 101, 025808 (2020)

Q.Liu, M.Febbraro, R.J.deBoer, S.Aguilar, A.Boeltzig, Y.Chen, M.Couder, J.Gorres, E.Lamere, S.Lyons, K.T.Macon, K.Manukyan, L.Morales, S.Pain, W.A.Peters, C.Seymour, G.Seymour, R.Toomey, B.Vande Kolk, J.Weaver, M.Wiescher

Low-energy cross-section measurement of the 10B(α, n)13N reaction and its impact on neutron production in first-generation stars

NUCLEAR REACTIONS 10B(α, n)13N, E=575-2522 keV; measured E(n), I(n), n(θ), σ(E, θ), differential S factors using deuterated liquid scintillator detector for neutrons at the University of Notre Dame Nuclear Science Laboratory. 10B(α, pγ)13C, E=835-1665 keV; measured Eγ and Iγ. 14N; deduced levels, resonances, J, π, Γα, Γn, Γp, Γd, and Γ from R-matrix analysis, and compared with earlier experimental results. 10B(α, n), (α, p), (α, d), (α, α), E(cm)=0.4-1.2 MeV; analyzed present and previous experimental data for differential σ(E) by R-matrix fit. 10B(α, n)13N, T=0.1-10 GK; deduced astrophysical reaction rates, and compared to literature data.

doi: 10.1103/PhysRevC.101.025808
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2020SH09      Phys.Rev.Lett. 124, 162701 (2020)

Y.P.Shen, B.Guo, R.J.deBoer, Z.H.Li, Y.J.Li, X.D.Tang, D.Y.Pang, S.Adhikari, C.Basu, J.Su, S.Q.Yan, Q.W.Fan, J.C.Liu, C.Chen, Z.Y.Han, X.Y.Li, G.Lian, T.L.Ma, W.Nan, W.K.Nan, Y.B.Wang, S.Zeng, H.Zhang, W.P.Liu

Constraining the External Capture to the 16O ground State and the E2 S Factor of the 12C(α, γ)16O reaction

NUCLEAR REACTIONS 12C(11B, 7Li)16O, E=50 MeV; measured reaction products; deduced σ(θ), the ground state asymptotic normalization coefficients, S-factors. Comparison with available data.

doi: 10.1103/PhysRevLett.124.162701
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2020TA08      Phys.Rev.Lett. 124, 192702 (2020)

W.P.Tan, A.Boeltzig, C.Dulal, R.J.deBoer, B.Frentz, S.Henderson, K.B.Howard, R.Kelmar, J.J.Kolata, J.Long, K.T.Macon, S.Moylan, G.F.Peaslee, M.Renaud, C.Seymour, G.Seymour, B.Vande Kolk, M.Wiescher, E.F.Aguilera, P.Amador-Valenzuela, D.Lizcano, E.Martinez-Quiroz

New Measurement of 12C+12C Fusion Reaction at Astrophysical Energies

NUCLEAR REACTIONS 12C(12C, X), E(cm)=2.2-5.0 MeV; measured reaction products, Eγ, Iγ; deduced σ, S-factor. Comparison with available data.

doi: 10.1103/PhysRevLett.124.192702
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2020WI03      Acta Phys.Pol. B51, 631 (2020)

M.Wiescher, R.J.DeBoer, J.Gorres, A.Gula, Q.Liu

Neutrons Sources in Early Stars*

doi: 10.5506/APhysPolB.51.631
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2019BE31      Phys.Lett. B 797, 134900 (2019)

A.Best, F.R.Pantaleo, A.Boeltzig, G.Imbriani, M.Aliotta, J.Balibrea-Correa, D.Bemmerer, C.Broggini, C.G.Bruno, R.Buompane, A.Caciolli, F.Cavanna, T.Chillery, G.F.Ciani, P.Corvisiero, L.Csedreki, T.Davinson, R.J.deBoer, R.Depalo, A.Di Leva, Z.Elekes, F.Ferraro, E.M.Fiore, A.Formicola, Zs.Fulop, G.Gervino, A.Guglielmetti, C.Gustavino, Gy.Gyurky, M.Junker, I.Kochanek, M.Lugaro, P.Marigo, R.Menegazzo, V.Mossa, V.Paticchio, R.Perrino, D.Piatti, P.Prati, L.Schiavulli, K.Stockel, O.Straniero, F.Strieder, T.Szucs, M.P.Takacs, D.Trezzi, M.Wiescher, S.Zavatarelli

Cross section of the reaction 18O(p, γ)19F at astrophysical energies: The 90 keV resonance and the direct capture component

NUCLEAR REACTIONS 18O(p, γ), E<1 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, resonance parameters, σ. Comparison with available data.

doi: 10.1016/j.physletb.2019.134900
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2019BO09      Phys.Lett. B 795, 122 (2019)

A.Boeltzig, A.Best, F.R.Pantaleo, G.Imbriani, M.Junker, M.Aliotta, J.Balibrea-Correa, D.Bemmerer, C.Broggini, C.G.Bruno, R.Buompane, A.Caciolli, F.Cavanna, T.Chillery, G.F.Ciani, P.Corvisiero, L.Csedreki, T.Davinson, R.J.deBoer, R.Depalo, A.Di Leva, Z.Elekes, F.Ferraro, E.M.Fiore, A.Formicola, Zs.Fulop, G.Gervino, A.Guglielmetti, C.Gustavino, Gy.Gyurky, I.Kochanek, M.Lugaro, P.Marigo, R.Menegazzo, V.Mossa, F.Munnik, V.Paticchio, R.Perrino, D.Piatti, P.Prati, L.Schiavulli, K.Stockel, O.Straniero, F.Strieder, T.Szucs, M.P.Takacs, D.Trezzi, M.Wiescher, S.Zavatarelli

Direct measurements of low-energy resonance strengths of the 23Na(p, γ)24Mg reaction for astrophysics

NUCLEAR REACTIONS 23Na(p, γ), E<1 MeV; measured reaction products, Eγ, Iγ; deduced resonance parameters, strengths, astrophysical reaction rates. Comparison with available data.

doi: 10.1016/j.physletb.2019.05.044
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2019LI42      Phys.Rev. C 100, 034601 (2019)

Q.Liu, M.Febbraro, R.J.deBoer, A.Boeltzig, Y.Chen, C.Cerjan, M.Couder, B.Frentz, J.Gorres, E.A.Henry, E.Lamere, K.T.Macon, K.V.Manukyan, L.Morales, P.D.O'Malley, S.D.Pain, W.A.Peters, D.Schneider, C.Seymour, G.Seymour, E.Temanson, R.Toomey, B.Vande Kolk, J.Weaver, M.Wiescher

Measurement of the 10Ba (α, n0) 13N cross section for 2.2 < Eα < 4.9 MeV and its application as a diagnostic at the National Ignition Facility

NUCLEAR REACTIONS 10B(α, n), (α, n0)13N, E=2.2-4.9 MeV; measured En, In using five deuterated liquid scintillation detectors at the University of Notre Dame Nuclear Science Laboratory; deduced differential σ(E), angular distribution coefficients, thick target yields. Comparison with previous experimental data. Preliminary calculations performed to test feasibility of this reaction as a diagnostic tool for the National Ignition Facility (NIF) implosion. 10B(α, p)13C, E=2.2-4.9 MeV; measured secondary Eγ, γ-ray yields, used for troubleshooting during the experiment.

doi: 10.1103/PhysRevC.100.034601
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2019TH03      Eur.Phys.J. A 55, 92 (2019)

I.J.Thompson, R.J.deBoer, P.Dimitriou, S.Kunieda, M.T.Pigni, G.Arbanas, H.Leeb, T.Srdinko, G.Hale, P.Tamagno, P.Archier

Verification of R-matrix calculations for charged-particle reactions in the resolved resonance region for the 7Be system

NUCLEAR REACTIONS 4He(3He, 3He)4He; 6Li(p, α0)3He; 6Li(p, p0)6Li, E* below 8 MeV; calculated σ using different R-code algorithms; compared results and possibilities both for total σ and for the individual l-waves.

doi: 10.1140/epja/i2019-12753-y
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2018LO11      Phys.Rev. C 97, 054613 (2018)

A.M.Long, T.Adachi, M.Beard, G.P.A.Berg, M.Couder, R.J.deBoer, M.Dozono, J.Gorres, H.Fujita, Y.Fujita, K.Hatanaka, D.Ishikawa, T.Kubo, H.Matsubara, Y.Namiki, S.O'Brien, Y.Ohkuma, H.Okamura, H.J.Ong, D.Patel, Y.Sakemi, Y.Shimbara, S.Suzuki, R.Talwar, A.Tamii, A.Volya, T.Wakasa, R.Watanabe, M.Wiescher, R.Yamada, J.Zenihiro

α-unbound levels in 34Ar from 36Ar(p, t)34Ar reaction measurements and implications for the astrophysical 30S (α, p)33Cl reaction rate

NUCLEAR REACTIONS 36Ar(p, t), E=100 MeV; measured triton spectra, σ(θ) using Grand Raiden spectrograph at RCNP, Osaka. 34Ar; deduced levels, α-unbound states; calculated single proton widths, spin distributions for selected excitation energies, and α-spectroscopic factors using back-shifted Fermi gas (BSFG) model and shell model calculations. Comparison of 34Ar levels in several previous experiments. 30S(α, p)33Cl, T9=0.10-3.0; calculated astrophysical reaction rates at temperatures relevant to x-ray bursts (XRB) using a Monte Carlo approach within a narrow-resonance formalism. Comparison of reaction rates with two standard Hauser-Feshbach model predictions.

doi: 10.1103/PhysRevC.97.054613
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2018LY04      Phys.Rev. C 97, 065802 (2018)

S.Lyons, J.Gorres, R.J.deBoer, E.Stech, Y.Chen, G.Gilardy, Q.Liu, A.M.Long, M.Moran, D.Robertson, C.Seymour, B.Vande Kolk, M.Wiescher, A.Best

Determination of 20Ne(p, γ)21Na cross sections from Ep = 500 2000 keV

NUCLEAR REACTIONS 20,22Ne(p, γ), E=500-2000 keV; measured Eγ, Iγ, γ(θ), differential σ(θ, E) at the KN accelerator of Notre Dame Nuclear Science Laboratory. 21Na; deduced levels, resonances, asymptotic normalization constants (ANCs), proton widths, γ-widths, astrophysical S-factor, and reaction rates in the range of 0.010-10.0 GK. AZURE2 R-matrix analysis. Comparison with previous experimental results, NACRE evaluation, and with theoretical predictions. Relevance to nucleosynthesis of Ne, Na, and Mg isotopes, and hydrogen burning in red giants, asymptotic giant branch (AGB) stars, massive stars, and oxygen-neon (ONe) nova.

doi: 10.1103/PhysRevC.97.065802
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2017DE26      Rev.Mod.Phys. 89, 035007 (2017)

R.J.deBoer, J.Gorres, M.Wiescher, R.E.Azuma, A.Best, C.R.Brune, C.E.Fields, S.Jones, M.Pignatari, D.Sayre, K.Smith, F.X.Timmes, E.Uberseder

The 12C(α, γ)16O reaction and its implications for stellar helium burning

NUCLEAR REACTIONS 12C(α, γ)16O, E(cm)<6 MeV; analyzed available data; deduced σ, reaction rates and uncertainties.

doi: 10.1103/RevModPhys.89.035007
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2017FA10      Phys.Rev. C 96, 045804 (2017)

X.Fang, W.P.Tan, M.Beard, R.J.deBoer, G.Gilardy, H.Jung, Q.Liu, S.Lyons, D.Robertson, K.Setoodehnia, C.Seymour, E.Stech, B.Vande Kolk, M.Wiescher, R.T.deSouza, S.Hudan, V.Singh, X.D.Tang, E.Uberseder

Experimental measurement of 12C + 16O fusion at stellar energies

NUCLEAR REACTIONS 12C(16O, p), (16O, n), (16O, α), E=8.5-11.7 MeV in steps of 100 or 200 keV; measured Eγ, Iγ, Ep, Ip, pγ-coin, charged particles, partial and total fusion σ(E) at the (ANA) accelerator laboratory (NSL) of University of Notre Dame; deduced S factors, astrophysical reaction rates, uncertainty range of the reaction rate within the temperature range of late stellar burning environments. Results analyzed using Statistical model calculations with SAPPHIRE code. 27Al, 24Mg, 27Si; deduced levels, relative γ strengths of the observed transitions with respect to the strength of the ground state transition of the first excited states.

doi: 10.1103/PhysRevC.96.045804
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2017GU05      Phys.Rev. C 95, 025807 (2017)

G.L.Guardo, C.Spitaleri, L.Lamia, M.Gulino, M.La Cognata, X.Tang, R.deBoer, X.Fang, V.Goldberg, J.Mrazek, A.Mukhamedzhanov, M.Notani, R.G.Pizzone, G.G.Rapisarda, M.L.Sergi, M.Wiescher

Assessing the near threshold cross section of the 17O(n, α)14C reaction by means of the Trojan horse method

NUCLEAR REACTIONS 2H(17O, α14C), E=43.5 MeV; measured reaction products, particle spectra, (particle)(particle)-coin, angular distributions using two telescopes of ionization chambers (IC) and silicon position-sensitive detector (PSD) at LNS-Catania and NSL-Notre Dame accelerator facilities; deduced normalized reaction yields, experimental momentum distribution, quasifission (QF) cross sections and best fit from R-matrix analysis. 18O; deduced levels, resonances, J, π, and Trojan horse method (THM) analysis of Γn, Γα and total widths. 17O(n, α)14C, T9=0.01-10; deduce astrophysical reaction rates by THM method.

doi: 10.1103/PhysRevC.95.025807
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2017LO05      Phys.Rev. C 95, 055803 (2017)

A.M.Long, T.Adachi, M.Beard, G.P.A.Berg, Z.Buthelezi, J.Carter, M.Couder, R.J.deBoer, R.W.Fearick, S.V.Fortsch, J.Gorres, J.P.Mira, S.H.T.Murray, R.Neveling, P.Papka, F.D.Smit, E.Sideras-Haddad, J.A.Swartz, R.Talwar, I.T.Usman, M.Wiescher, J.J.Van Zyl, A.Volya

Indirect study of the stellar 34Ar(α, p)37K reaction rate through 40Ca(p, t)38Ca reaction measurements

NUCLEAR REACTIONS 40Ca(p, t)38Ca, E=100 MeV; measured spectra using the K=600 magnetic spectrograph, triton spectra at K=200 Separated Sector Cyclotron facility of iThemba LABS. 38Ca; deduced levels, α-unbound states, resonances, α-spectroscopic factors. Comparison with previous experimental results. 34Ar(α, p)37K, T9=0.2-3.0; deduced reaction rates as a function of stellar temperature, and compared with theoretical model calculations using NON-SMOKER-v5.0w and TALYS 1.8 codes. Relevance to type I x-ray bursts (XRBs).

doi: 10.1103/PhysRevC.95.055803
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2017OZ01      Phys.Rev. C 96, 045805 (2017)

N.Ozkan, R.T.Guray, C.Yalcin, W.P.Tan, A.Aprahamian, M.Beard, R.J.deBoer, S.Almaraz-Calderon, S.Falahat, J.Gorres, Q.Li, A.Sauerwein, K.Sonnabend, M.Wiescher, Zs.Fulop, Gy.Gyurky, E.Somorjai, J.Greene

Proton capture reaction cross section measurements on 162Er as a probe of statistical model calculations

NUCLEAR REACTIONS 162Er(p, γ)163Tm, 162Er(p, n)162Tm, E=4.0-9.0 MeV in steps of 0.5 MeV; measured reaction products, Eγ, Iγ, σ(E) by activation method using the FN tandem accelerator at the University of Notre Dame; deduced S factors. Comparison with Hauser Feshbach (HF) statistical model calculations using NON-SMOKER and TALYS codes.

doi: 10.1103/PhysRevC.96.045805
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2017WI05      Phys.Rev. C 95, 044617 (2017)

M.Wiescher, R.J.deBoer, J.Gorres, R.E.Azuma

Low energy measurements of the 10B (p, α) 7Be reaction

NUCLEAR REACTIONS 10B(p, p), (p, α), E=80-1440 keV; measured Eα, Iα σ(θ, E) at incident E(p)=400-1000 keV, and Eγ, Iγ at E(p)=80-1440 keV for the yield of the 429 keV radiation from the reaction at the University of Notre Dame; deduced total S-factor, Legendre polynomial fit parameters from angular distributions. R-matrix analysis. Comparison with previous experimental data.

doi: 10.1103/PhysRevC.95.044617
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2016BO10      Eur.Phys.J. A 52, 75 (2016)

A.Boeltzig, C.G.Bruno, F.Cavanna, S.Cristallo, T.Davinson, R.Depalo, R.J.deBoer, A.Di Leva, F.Ferraro, G.Imbriani, P.Marigo, F.Terrasi, M.Wiescher

Shell and explosive hydrogen burning - Nuclear reaction rates for hydrogen burning in RGB, AGB and Novae

COMPILATION 15N(p, γ0), (p, γ), E(cm)=0.01-2 MeV;15N, 17O, 22Ne, 23Na, 25Mg(p, γ), T=0.01-1 GK;17O(p, α), T=0.01-1 GK; compiled data on reaction rates. 15N(p, γ0); deduced S-factor using R-matrix.

doi: 10.1140/epja/i2016-16075-4
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2016LI29      Phys.Rev. C 93, 055806 (2016)

Q.Li, J.Gorres, R.J.deBoer, G.Imbriani, A.Best, A.Kontos, P.J.LeBlanc, E.Uberseder, M.Wiescher

Cross section measurement of 14N(p, γ)15O in the CNO cycle

NUCLEAR REACTIONS 14N(p, γ)15O, E=0.7-3.6 MeV; measured Eγ, Iγ, γ(θ), differential σ(E) for ground-state and 6.79 MeV transitions using the 1MV JN and 4 MV KN Van de Graaff accelerators at the University of Notre Dame. TiN and implanted 14N targets. 15O; deduced levels, resonances, J, π, astrophysical S factors. Multichannel R-matrix analysis. Relevance to CNO cycle in stars.

doi: 10.1103/PhysRevC.93.055806
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2016TA09      Phys.Rev. C 93, 055803 (2016)

R.Talwar, T.Adachi, G.P.A.Berg, L.Bin, S.Bisterzo, M.Couder, R.J.deBoer, X.Fang, H.Fujita, Y.Fujita, J.Gorres, K.Hatanaka, T.Itoh, T.Kadoya, A.Long, K.Miki, D.Patel, M.Pignatari, Y.Shimbara, A.Tamii, M.Wiescher, T.Yamamoto, M.Yosoi

Probing astrophysically important states in the 26Mg nucleus to study neutron sources for the s process

NUCLEAR REACTIONS 26Mg(α, α'), E=206 MeV; 22Ne(6Li, d)26Mg, E=82.3 MeV; measured Eα, Iα, E(d), I(d), σ(θ) using Grand Raiden (GR) spectrometer at RCNP-Osaka. 26Mg; deduced α-unbound resonance energies, levels, J, π, α-spectroscopic factors, resonance strengths. Angular distributions for inelastic scattering analyzed by coupled channel code PTOLEMY and for transfer reactions by FRESCO code. 22Ne(α, γ)26Mg, 22Ne(α, n)25Mg, T9=0.01-10; deduced astrophysical reaction rates from resonance parameters. Comparison with previous results. Relevance to slow neutron capture process (s process) in massive stars.

doi: 10.1103/PhysRevC.93.055803
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2015BA51      Phys.Lett. B 751, 311 (2015)

D.W.Bardayan, K.A.Chipps, S.Ahn, J.C.Blackmon, R.J.deBoer, U.Greife, K.L.Jones, A.Kontos, R.L.Kozub, L.Linhardt, B.Manning, M.Matos, P.D.O'Malley, S.Ota, S.D.Pain, W.A.Peters, S.T.Pittman, A.Sachs, K.T.Schmitt, M.S.Smith, P.Thompson

The first science result with the JENSA gas-jet target: Confirmation and study of a strong subthreshold 18F(p, α)15O resonance

NUCLEAR REACTIONS 20Ne(p, d), E=30 MeV; measured reaction products; deduced deuteron σ(θ), excitation energies, resonance J. Distorted-wave Born approximation (DWBA) calculations using the computer code TWOFNR7.

NUCLEAR REACTIONS 18F(p, α), E(cm)<1 MeV; calculated astrophysical reaction rate, S-factor with the R-matrix code AZURE2.

doi: 10.1016/j.physletb.2015.10.073
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2015BU08      Phys.Rev.Lett. 114, 251102 (2015)

B.Bucher, X.D.Tang, X.Fang, A.Heger, S.Almaraz-Calderon, A.Alongi, A.D.Ayangeakaa, M.Beard, A.Best, J.Browne, C.Cahillane, M.Couder, R.J.deBoer, A.Kontos, L.Lamm, Y.J.Li, A.Long, W.Lu, S.Lyons, M.Notani, D.Patel, N.Paul, M.Pignatari, A.Roberts, D.Robertson, K.Smith, E.Stech, R.Talwar, W.P.Tan, M.Wiescher, S.E.Woosley

First Direct Measurement of 12C(12C, n)23Mg at Stellar Energies

NUCLEAR REACTIONS 12C(12C, n), E=7.5, 9.5 MeV; measured reaction products, Eγ, Iγ, En, In; deduced yields, S-factors, astrophysical reaction rate. Comparison with available data.

doi: 10.1103/PhysRevLett.114.251102
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2015CH27      Phys.Rev. C 91, 045801 (2015); Pub.Note Phys.Rev. C 91, 049905 (2015)

S.Chakraborty, R.deBoer, A.Mukherjee, S.Roy

Systematic R-matrix analysis of the 13C(p, γ)14N capture reaction

NUCLEAR REACTIONS 13C(p, γ)14N, E<950 keV; analyzed experimental data by R-matrix formalism using AZURE2 code; deduced asymptotic normalization constants (ANCs), astrophysical S(E) factor, resonance parameters, reaction rates for T9=0.001 to 0.05. Comparison with NACRE I and NACRE II compilations.

doi: 10.1103/PhysRevC.91.045801
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2015SE08      Phys.Rev. C 91, 065803 (2015)

M.L.Sergi, C.Spitaleri, M.La Cognata, L.Lamia, R.G.Pizzone, G.G.Rapisarda, X.D.Tang, B.Bucher, M.Couder, P.Davies, R.deBoer, X.Fang, L.Lamm, C.Ma, M.Notani, S.O'Brien, D.Roberson, W.Tan, M.Wiescher, B.Irgaziev, A.Mukhamedzhanov, J.Mrazek, V.Kroha

Improvement of the high-accuracy 17O(p, α)14N reaction-rate measurement via the Trojan Horse method for application to 17O nucleosynthesis

NUCLEAR REACTIONS 2H(17O, α14N)n, E=41, 43.5 MeV; measured particle spectra, (14N)α-coin at LNS-Catania and NSL-Notre Dame accelerator facilities; deduced Q-value spectra, yields as function of 14N and α emission angles, E(14N-α) versus E(α-n) plots, neutron momentum distributions, (14N)α-coincidence yields for different neutron momentum ranges, differential σ(E) of the Trojan-Horse reaction. 18F; deduced parameters for the two resonance levels, resonance strengths for the 65-keV resonance. 17O(p, α)14N; deduced reaction rates via Trojan Horse Method (THM). 18F; compiled resonance energies, J, π, Γp, Γα, Γγ for 24 resonances from -3.12 keV to 1684.5 keV. Relevance to destruction of 17O and the formation of 18F in stellar sites.

doi: 10.1103/PhysRevC.91.065803
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2013BE11      Phys.Rev. C 87, 045805 (2013)

A.Best, M.Beard, J.Gorres, M.Couder, R.deBoer, S.Falahat, R.T.Guray, A.Kontos, K.-L.Kratz, P.J.LeBlanc, Q.Li, S.O'Brien, N.Ozkan, M.Pignatari, K.Sonnabend, R.Talwar, W.Tan, E.Uberseder, M.Wiescher

Measurement of the reaction 17O(α, n)20Ne and its impact on the s process in massive stars

NUCLEAR REACTIONS 17O(α, n), E=800-2300 keV; measured Eγ, Iγ, E(n), I(n), yields as function of incident Eα for (α, n0) and (α, n1) channels; deduced R-matrix parameters, S factors, reaction rates. 21Ne; deduced levels, resonances, J, π, width, resonance strengths. R-matrix analyses. 17O(α, n), (α, γ), E at 0.1 to 10 GK; comparison of experimental and theoretical (NACRE, CF88/1000) reaction rates. Hauser-Feshbach theory. Astrophysical implications for the s-process, and elemental abundance.

doi: 10.1103/PhysRevC.87.045805
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2013BE12      Phys.Rev. C 87, 045806 (2013)

A.Best, S.Falahat, J.Gorres, M.Couder, R.deBoer, R.T.Guray, A.Kontos, K.-L.Kratz, P.J.LeBlanc, Q.Li, S.O'Brien, N.Ozkan, K.Sonnabend, R.Talwar, E.Uberseder, M.Wiescher

Measurement of the reaction 18O(α, n)21Ne

NUCLEAR REACTIONS 18O(α, n), E=851-2300 keV; measured Eγ, Iγ, E(n), I(n), yields as function of incident Eα for (α, n0) and (α, n1) channels; deduced R-matrix parameters, S factors, reaction rates. 22Ne; deduced levels, resonances, J, π, width, resonance strengths. R-matrix analyses. 18O(α, n), (α, γ), E at 0.1 to 10 GK; comparison of experimental and theoretical (NACRE, CF88) reaction rates. Hauser-Feshbach theory.

doi: 10.1103/PhysRevC.87.045806
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2013GU02      Phys.Rev. C 87, 012801 (2013)

M.Gulino, C.Spitaleri, X.D.Tang, G.L.Guardo, L.Lamia, S.Cherubini, B.Bucher, V.Burjan, M.Couder, P.Davies, R.deBoer, X.Fang, V.Z.Goldberg, Z.Hons, V.Kroha, L.Lamm, M.La Cognata, C.Li, C.Ma, J.Mrazek, A.M.Mukhamedzhanov, M.Notani, S.O'Brien, R.G.Pizzone, G.G.Rapisarda, D.Roberson, M.L.Sergi, W.Tan, I.J.Thompson, M.Wiescher

Suppression of the centrifugal barrier effects in the off-energy-shell neutron + 17O interaction

NUCLEAR REACTIONS 2H(17O, α14C), E=41, 43.5 MeV; measured α and 14C particle spectra, (14C)α-coin, angular distributions, yields using position-sensitive silicon detectors (PSD) at LNS, Catania, and at NSL, Notre Dame. CD2 target; deduced momentum distributions, Q value. DWBA analysis. 17O(n, α)14C, E(cm)=0-350 keV; deduced yields, angular distributions, neutron from quasifree breakup of deuteron. 18O; deduced resonances, J, π, and excitation functions. Trojan Horse method (THM), and suppression of centrifugal barrier. Comparison with previous studies. Relevance to neutron-induced reactions in nuclear reactors, and nucleosynthesis in astrophysics.

doi: 10.1103/PhysRevC.87.012801
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2013KO18      Phys.Rev. C 87, 065804 (2013)

A.Kontos, E.Uberseder, R.deBoer, J.Gorres, C.Akers, A.Best, M.Couder, M.Wiescher

Astrophysical S factor of 3He (α, γ)7Be

NUCLEAR REACTIONS 3He(α, γ)7Be, E=530-2550 keV; measured Eγ, Iγ, particle spectra, radiative capture σ at NSL facility in Notre Dame; deduced astrophysical S(E) factor, branching ratio, gamma and proton widths, reaction rates at T=0.01 to 10 GK. R-matrix analyses for 3He(α, α)3He and 3He(α, γ)7Be data. Discussed astrophysical implications. Comparison with previous experimental studies.

doi: 10.1103/PhysRevC.87.065804
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2012KO41      Phys.Rev. C 86, 055801 (2012); Erratum Phys.Rev. C 88, 029905 (2013)

A.Kontos, J.Gorres, A.Best, M.Couder, R.deBoer, G.Imbriani, Q.Li, D.Robertson, D.Schurmann, E.Stech, E.Uberseder, M.Wiescher

Proton capture on 17O and its astrophysical implications

NUCLEAR REACTIONS 17O(p, γ)18F, E(cm)=345-1700 keV, measured Eγ, Iγ, γ(θ), excitation functions, σ(E). 18F; deduced levels, proton resonances, J, π, γ-branching ratios, resonance strengths, ANC, spectroscopic factors, proton, alpha and gamma widths, astrophysical reaction rates and S factors. R-matrix analysis. Comparison with literature values. Relevance to hydrogen-burning nucleosynthesis.

doi: 10.1103/PhysRevC.86.055801
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2011BE17      Phys.Rev. C 83, 052802 (2011)

A.Best, J.Gorres, M.Couder, R.deBoer, S.Falahat, A.Kontos, P.J.LeBlanc, Q.Li, S.O'Brien, K.Sonnabend, R.Talwar, E.Uberseder, M.Wiescher

First direct measurement of resonance strengths in 17O(α, γ)21Ne

NUCLEAR REACTIONS 17O(α, γ), E=750-1650 keV; measured Eγ, Iγ. 21Ne; deduced resonances, resonance strengths, levels, J, π, γ-branching ratios. Implications for neutron poisoning efficiency of 16O in the weak s-process. Comparison with previous experimental data, Caughlan-Fowler reaction rates, and calculated rates based on a microscopic three-cluster model of Descouvemont.

doi: 10.1103/PhysRevC.83.052802
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2010LE21      Phys.Rev. C 82, 055804 (2010), Erratum Phys.Rev. C 84, 019902 (2011)

P.J.LeBlanc, G.Imbriani, J.Gorres, M.Junker, R.Azuma, M.Beard, D.Bemmerer, A.Best, C.Broggini, A.Caciolli, P.Corvisiero, H.Costantini, M.Couder, R.deBoer, Z.Elekes, S.Falahat, A.Formicola, Zs.Fulop, G.Gervino, A.Guglielmetti, C.Gustavino, Gy.Gyurky, F.Kappeler, A.Kontos, R.Kuntz, H.Leiste, A.Lemut Q.Li, B.Limata, M.Marta, C.Mazzocchi, R.Menegazzo, S.O'Brien, A.Palumbo, P.Prati, V.Roca, C.Rolfs, C.Rossi Alvarez, E.Somorjai, E.Stech, O.Straniero, F.Strieder, W.Tan, F.Terrasi, H.P.Trautvetter, E.Uberseder, M.Wiescher

Constraining the S factor of 15N(p, γ)16O at astrophysical energies

NUCLEAR REACTIONS 15N(p, γ), E=130-1800 keV; measured Ep, Ip, Eγ, Iγ, σ(E), σ(θ); deduced resonances, branching ratios, astrophysical S factors and reaction rates. Multilevel R-matrix analysis. Implications for the first and second cycles of the CNO cycles.

doi: 10.1103/PhysRevC.82.055804
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2009GU27      Phys.Rev. C 80, 035804 (2009)

R.T.Guray, N.Ozkan, C.Yalcin, A.Palumbo, R.deBoer, J.Gorres, P.J.Leblanc, S.O'Brien, E.Strandberg, W.P.Tan, M.Wiescher, Zs.Fulop, E.Somorjai, H.Y.Lee, J.P.Greene

Measurements of proton-induced reaction cross sections on 120Te for the astrophysical p process

NUCLEAR REACTIONS 120Te(p, γ), (p, n), E(cm)=2.47-7.93 MeV; measured Eγ, Iγ, half-life, σ by activation method; deduced astrophysical S factors. Comparison with statistical model calculations using NON-SMOKER and TALYS computer codes.

RADIOACTIVITY 120I(EC); measured Eγ. 120I; deduced ground-state half-life.

doi: 10.1103/PhysRevC.80.035804
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