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NSR database version of May 10, 2024.

Search: Author = S.Almaraz-Calderon

Found 37 matches.

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2022LO05      Phys.Rev. C 105, L042801 (2022)

G.Lotay, D.T.Doherty, R.V.F.Janssens, D.Seweryniak, H.M.Albers, S.Almaraz-Calderon, M.P.Carpenter, A.E.Champagne, C.J.Chiara, C.R.Hoffman, C.Iliadis, A.Kankainen, T.Lauritsen, S.Zhu

Revised decay properties of the key 93-keV resonance in the 25Mg(p, γ) reaction and its influence on the MgAl cycle in astrophysical environments

NUCLEAR REACTIONS 11B(16O, n), E=19 MeV; measured Eγ, Iγ, γ(θ), γγγ-coin. 26Al; deduced levels J, π, branchings. Obtained ground state branching for 93-keV resonance of 25Mg+p system which corresponds to 6398 keV level in 26Al. Comparison to other experimental data. Discussed impact on the production of cosmic γ rays. Gammasphere array with 99 detectors at ATLAS accelerator (ANL).

doi: 10.1103/PhysRevC.105.L042801
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Data from this article have been entered in the XUNDL database. For more information, click here.


2022LO08      Phys.Rev.Lett. 129, 012502 (2022)

E.Lopez-Saavedra, S.Almaraz-Calderon, B.W.Asher, L.T.Baby, N.Gerken, K.Hanselman, K.W.Kemper, A.N.Kuchera, A.B.Morelock, J.F.Perello, E.S.Temanson, A.Volya, I.Wiedenhover

Observation of a Near-Threshold Proton Resonance in 11B

NUCLEAR REACTIONS 2H(10Be, n)11B, E=39 MeV; measured reaction products, Ep, Ip, Eα, Iα; deduced near-threshold proton resonance, spectroscopic factor, angular momentum transfer. Comparison with available data. Distorted wave Born approximation calculations. The Tandem-Linac accelerator, the John D. Fox accelerator laboratory of Florida State University.

doi: 10.1103/PhysRevLett.129.012502
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2022PE02      Phys.Rev. C 105, 035805 (2022)

J.F.Perello, S.Almaraz-Calderon, B.W.Asher, L.T.Baby, C.Benetti, K.W.Kemper, E.Lopez-Saavedra, G.W.McCann, A.B.Morelock, V.Tripathi, I.Wiedenhover, B.Sudarsan

Low-lying resonances in 26Si relevant for the determination of the astrophysical 25Al(p, γ)26Si reaction rate

NUCLEAR REACTIONS 24Mg(3He, n), E=10 MeV; measured ToF, En, In, Eγ, Iγ, nγ-coin. 26Si; deduced levels, J, π, partial decay widths. 25Al(p, γ), T=0.01-1 GK; deduced proton capture rate using newly observed states in 26Si, contribution of individual resonances to the total reaction rate. Comparison to reaction rate values from JINA REACLIB database. CATRiNA neutron detector array (16 deuterated liquid scintillators) combined with 3 HPGe clover detectors.

doi: 10.1103/PhysRevC.105.035805
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Data from this article have been entered in the XUNDL database. For more information, click here.


2022TA07      Phys.Rev. C 105, 064307 (2022)

T.L.Tang, C.R.Hoffman, B.P.Kay, I.A.Tolstukhin, S.Almaraz-Calderon, B.W.Asher, M.L.Avila, Y.Ayyad, K.W.Brown, D.Bazin, J.Chen, K.A.Chipps, P.A.Copp, M.Hall, H.Jayatissa, H.J.Ong, D.Santiago-Gonzalez, D.K.Sharp, J.Song, S.Stolze, G.L.Wilson, J.Wu

Experimental study of the isomeric state in 16N using the 16Ng, m(d, 3He) reaction

NUCLEAR REACTIONS 2H(16N, 3He), (16mN, 3He), E=11.8 MeV/nucleon, [secondary 16N mixed beam of ground state and the isomeric state produced in 2H(15N, 16N) primary reaction at ATLAS-ANL facility]; measured reaction products, 3He spectra, (recoils)(3He)-coin, angular distributions using HELIOS spectrometer. 15C; deduced levels, J, π, spectroscopic factors, DWBA calculations. 16mN; deduced neutron-halo of the isomeric state. Comparison with Woods-Saxon potential model calculations.

doi: 10.1103/PhysRevC.105.064307
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2772. Data from this article have been entered in the XUNDL database. For more information, click here.


2021AS05      Phys.Rev. C 103, 044615 (2021)

B.W.Asher, S.Almaraz-Calderon, V.Tripathi, K.W.Kemper, L.T.Baby, N.Gerken, E.Lopez-Saavedra, A.B.Morelock, J.F.Perello, I.Wiedenhover, N.Keeley

Experimental study of the 17F + 12C fusion reaction and its implications for fusion of proton-halo systems

NUCLEAR REACTIONS 12C(17F, X), E=69.1 MeV, [secondary 17F beam from 2H(16O, 17F), E=91.5 MeV primary reaction at the tandem Van de Graaff generator and LINAC accelerator of Florida State University (FSU)]; 12C(16O, X), E=58.1 MeV; 12C(19F, X), E=65 MeV; measured reaction products, total fusion σ using the Encore active-target detector, a multisampling ionization chamber recently developed at FSU; deduced no significant effect of the weak binding and the halo nature of the excited state in 17F on the total fusion cross sections. Comparison with previous experimental cross sections, and with coupled-channel calculations using FRESCO code.

doi: 10.1103/PhysRevC.103.044615
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2021AS09      Eur.Phys.J. A 57, 272 (2021)

B.W.Asher, S.Almaraz-Calderon, K.W.Kemper, L.T.Baby, E.Lopez-Saavedra, A.B.Morelock, J.F.Perello, V.Tripathi, N.Keeley

Resolution of a long-standing discrepancy in the 17O + 12C fusion excitation function

NUCLEAR REACTIONS 12C(17O, X), E(cm) = 14.3-20.5 MeV; measured reaction products; deduced total fusion σ and uncertainties, issues with the discrepant data.

doi: 10.1140/epja/s10050-021-00584-8
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2021CA19      Phys.Rev. C 104, L022802 (2021)

L.Canete, G.Lotay, G.Christian, D.T.Doherty, W.N.Catford, S.Hallam, D.Seweryniak, H.M.Albers, S.Almaraz-Calderon, E.A.Bennett, M.P.Carpenter, C.J.Chiara, J.P.Greene, C.R.Hoffman, R.V.F.Janssens, J.Jose, A.Kankainen, T.Lauritsen, A.Matta, M.Moukaddam, S.Ota, A.Saastamoinen, R.Wilkinson, S.Zhu

New constraints on the 25Al (p, γ) reaction and its influence on the flux of cosmic γ rays from classical nova explosions

NUCLEAR REACTIONS 11B(16O, p)26Mg, E=19 MeV from Argonne ATLAS accelerator; measured Eγ, Iγ, γγ-coin, γ(θ) and level half-lives by DSAM using Gammasphere array of 99 HPGe detectors. 2H(25Mg, p)26Mg, E=10 MeV/nucleon from Texas A and M cyclotron; measured outgoing protons and scattered deuterons using the TIARA Si array, and 26Mg recoils by the MDM-2 magnetic spectrometer with Oxford ionization chamber, angular distributions of scattered deuterons and protons. 26Mg; deduced levels, J, π, resonances, spectroscopic factors. 26Si; deduced levels, resonances, J, π, Γp, Γγ, resonance strengths by comparing with the level structures of mirror nucleus 26Mg. 25Al(p, γ)26Si, T=0.2-0.4 GK; deduced stellar reaction rate by considering the contribution of resonant states in 26Si, galactic abundance of 26Al from classical novae; performed nova outburst simulations using the hydrodynamic Lagrangian time-implicit code SHIVA.

doi: 10.1103/PhysRevC.104.L022802
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2658. Data from this article have been entered in the XUNDL database. For more information, click here.


2021GE09      Phys.Rev. C 104, 065807 (2021)

N.Gerken, S.Almaraz-Calderon, B.W.Asher, E.Lopez-Saveedra, L.T.Baby, K.W.Kemper, A.Morelock, J.F.Perello, A.Volya, I.Wiedenhover

Experimental study of the 24Nam(d, p)25Na reaction and implications for the influence of the 24Alm isomer on rp-process nucleosynthesis

NUCLEAR REACTIONS 2H(24Na, p)25Na, E=85.5 MeV, [secondary 24mNa with 90% content and 24Na with 10% from 2H(23Na, p)24,24mNa, E=113 MeV at the John D. Fox Accelerator Laboratory of Florida State University]; measured reaction products, ionization chamber spectrum, production σ and compared with DWBA calculations, E(p), I(p), σ(θ) and compared with DWBA calculations. 25Na; deduced levels, J, π, L-transfers, spectroscopic factors and compared with USDB shell-model calculations. 25Na, 25Si; compiled experimental levels, J, π, and compared with USDB shell-model calculations for A=25 system. 24,24mAl(p, γ)25Si, T=0.01-10 GK; deduced astrophysical reaction rates; evaluated contribution of the 1+ isomeric state in 24Al to the 24Al(p, γ)25Si reaction rate, and compared with rates in REACLIB. Relevance to destruction of 24Al via proton captures in its isomeric state in rp-process nucleosynthesis.

doi: 10.1103/PhysRevC.104.065807
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2703. Data from this article have been entered in the XUNDL database. For more information, click here.


2020HU10      Phys.Rev. C 102, 014615 (2020)

C.Hunt, G.V.Rogachev, S.Almaraz-Calderon, A.Aprahamian, M.Avila, L.T.Baby, B.Bucher, V.Z.Goldberg, E.D.Johnson, K.W.Kemper, A.N.Kuchera, W.P.Tan, I.Wiedenhover

Observation of T = 3/2 isobaric analog states in 9Be using p + 8Li resonance scattering

NUCLEAR REACTIONS 1H(8Li, 8Li), E(cm)=1.46-2.3 MeV, [secondary 8Li radioactive beam from 2H(7Li, 8Li), E=23.5, 27 MeV primary reaction]; measured energies of light and heavy recoils, (light recoils)(heavy recoils)-coin, differential σ(θ, E) using two annular Silicon strip detectors at RESOLUT radioactive nuclear beam facility of the FSU John D. Fox Superconducting Accelerator Laboratory. 9Be; deduced resonances J, π, width, T=3/2 IAS, spectroscopic factors from R-matrix analysis using MINRMATRIX code. Discussed isomirror properties for the T=3/2 A=9 isoquartet. Relevance to study of the structure of neutron-rich exotic nuclei through IAS.

doi: 10.1103/PhysRevC.102.014615
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2600. Data from this article have been entered in the XUNDL database. For more information, click here.


2019LO09      Eur.Phys.J. A 55, 109 (2019)

G.Lotay, D.T.Doherty, D.Seweryniak, S.Almaraz-Calderon, M.P.Carpenter, C.J.Chiara, H.M.David, C.R.Hoffman, R.V.F.Janssens, A.Kankainen, T.Lauritsen, R.Wilkinson, P.J.Woods, S.Zhu

Identification of γ-decaying resonant states in 26Mg and their importance for the astrophysical s process

doi: 10.1140/epja/i2019-12791-5
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2018AS03      Nucl.Instrum.Methods Phys.Res. A899, 6 (2018)

B.W.Asher, S.Almaraz-Calderon, O.Nusair, K.E.Rehm, M.L.Avila, A.A.Chen, C.A.Dickerson, C.L.Jiang, B.P.Kay, R.C.Pardo, D.Santiago-Gonzalez, R.Talwar

Development of an Isomeric beam of 26Al for nuclear reaction studies

NUCLEAR REACTIONS 1H(26Mg, 26Al), E=158.5 MeV; measured reaction products, Eγ, Iγ. 26mAl; deduced σ. Comparison with available data.

doi: 10.1016/j.nima.2018.05.015
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2018JI01      Phys.Rev. C 97, 012801 (2018)

C.L.Jiang, D.Santiago-Gonzalez, S.Almaraz-Calderon, K.E.Rehm, B.B.Back, K.Auranen, M.L.Avila, A.D.Ayangeakaa, S.Bottoni, M.P.Carpenter, C.Dickerson, B.DiGiovine, J.P.Greene, C.R.Hoffman, R.V.F.Janssens, B.P.Kay, S.A.Kuvin, T.Lauritsen, R.C.Pardo, J.Sethi, D.Seweryniak, R.Talwar, C.Ugalde, S.Zhu, D.Bourgin, S.Courtin, F.Haas, M.Heine, G.Fruet, D.Montanari, D.G.Jenkins, L.Morris, A.Lefebvre-Schuhl, M.Alcorta, X.Fang, X.D.Tang, B.Bucher, C.M.Deibel, S.T.Marley

Reaction rate for carbon burning in massive stars

NUCLEAR REACTIONS 12C(12C, p)23Na, (12C, α)20Ne, E=5.5-10 MeV; measured Eγ, Iγ, (particle)γ-coin, σ(E) using Gammasphere array and an array of three annular double-sided silicon strip detectors at the ATLAS-ANL facility; deduced S factors and astrophysical reaction rates. Comparison with previous measurements, and with data from other reactions. Relevance to carbon burning is a critical phase for nucleosynthesis in massive stars.

doi: 10.1103/PhysRevC.97.012801
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2288.


2018TE04      Phys.Rev.Lett. 121, 112701 (2018)

M.Tessler, M.Paul, S.Halfon, B.S.Meyer, R.Pardo, R.Purtschert, K.E.Rehm, R.Scott, M.Weigand, L.Weissman, S.Almaraz-Calderon, M.L.Avila, D.Baggenstos, P.Collon, N.Hazenshprung, Y.Kashiv, D.Kijel, A.Kreisel, R.Reifarth, D.Santiago-Gonzalez, A.Shor, I.Silverman, R.Talwar, D.Veltum, R.Vondrasek

Stellar 36, 38Ar(n, γ)37, 39Ar Reactions and Their Effect on Light Neutron-Rich Nuclide Synthesis

NUCLEAR REACTIONS 36,38Ar(n, γ), E ∼ 30 keV; measured reaction products, Eβ, Iβ; deduced thermal σ, Maxwellian average cross sections (MACS). Comparison with available data.

doi: 10.1103/PhysRevLett.121.112701
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2017AL29      Phys.Rev.Lett. 119, 072701 (2017)

S.Almaraz-Calderon, K.E.Rehm, N.Gerken, M.L.Avila, B.P.Kay, R.Talwar, A.D.Ayangeakaa, S.Bottoni, A.A.Chen, C.M.Deibel, C.Dickerson, K.Hanselman, C.R.Hoffman, C.L.Jiang, S.A.Kuvin, O.Nusair, R.C.Pardo, D.Santiago-Gonzalez, J.Sethi, C.Ugalde

Study of the 26Alm(d, p)27Al Reaction and the Influence of the 26Al 0+ Isomer on the Destruction of 26Al in the Galaxy

NUCLEAR REACTIONS C, 2H(26Al, p), E=120 MeV; measured reaction products, Eγ, Iγ. 26Al; deduced σ(θ), reaction rates. Comparison with available data, DWBA calculations.

doi: 10.1103/PhysRevLett.119.072701
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2278. Data from this article have been entered in the XUNDL database. For more information, click here.


2017AV03      Nucl.Instrum.Methods Phys.Res. A859, 63 (2017)

M.L.Avila, K.E.Rehm, S.Almaraz-Calderon, A.D.Ayangeakaa, C.Dickerson, C.R.Hoffman, C.L.Jiang, B.P.Kay, J.Lai, O.Nusair, R.C.Pardo, D.Santiago-Gonzalez, R.Talwar, C.Ugalde

Study of (α, p) and (α, n) reactions with a Multi-Sampling Ionization Chamber

NUCLEAR REACTIONS 4He(17O, n), (17O, α'), E=34.8 MeV; 4He(23Na, α), (23Na, p), E=51.5, 57.4 MeV; measured reaction products, Eα, Iα, Ep, Ip; deduced σ. Comparison with available data.

doi: 10.1016/j.nima.2017.03.060
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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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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2276.


2016AV06      Phys.Rev. C 94, 065804 (2016)

M.L.Avila, K.E.Rehm, S.Almaraz-Calderon, A.D.Ayangeakaa, C.Dickerson, C.R.Hoffman, C.L.Jiang, B.P.Kay, J.Lai, O.Nusair, R.C.Pardo, D.Santiago-Gonzalez, R.Talwar, C.Ugalde

Experimental study of the astrophysically important 23Na(α, p)26Mg and 23Na(α, n)26Al reactions

NUCLEAR REACTIONS 4He(23Na, p), (23Na, n), E=51.5, 57.4 MeV; measured particle spectra, and cross section using multisampling ionization chamber (MUSIC) detector at ATLAS-ANL facility. Comparison with previous measurements, NACRE compilation, and with statistical-model calculations. Technique to measure simultaneously excitation functions of angle- and excitation energy-integrated cross sections of (α, p) and (α, n) reactions. Relevance to 26Al production in massive stars.

doi: 10.1103/PhysRevC.94.065804
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2249.


2016AY01      Phys.Lett. B 754, 254 (2016)

A.D.Ayangeakaa, R.V.F.Janssens, C.Y.Wu, J.M.Allmond, J.L.Wood, S.Zhu, M.Albers, S.Almaraz-Calderon, B.Bucher, M.P.Carpenter, C.J.Chiara, D.Cline, H.L.Crawford, H.M.David, J.Harker, A.B.Hayes, C.R.Hoffman, B.P.Kay, K.Kolos, A.Korichi, T.Lauritsen, A.O.Macchiavelli, A.Richard, D.Seweryniak, A.Wiens

Shape coexistence and the role of axial asymmetry in 72Ge

NUCLEAR REACTIONS 208Pb(72Ge, 72Ge'), E=301 MeV; measured reaction products, Eγ, Iγ. 72Ge; deduced energy levels, J, π, reduced E2 matrix elements, B(E2) values. Comparison with available data.

doi: 10.1016/j.physletb.2016.01.036
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Data from this article have been entered in the XUNDL database. For more information, click here.


2016BE08      Phys.Rev. C 93, 044323 (2016)

S.Bedoor, A.H.Wuosmaa, M.Albers, M.Alcorta, S.Almaraz-Calderon, B.B.Back, P.F.Bertone, C.M.Deibel, C.R.Hoffman, J.C.Lighthall, S.T.Marley, D.G.Mcneel, R.C.Pardo, K.E.Rehm, J.P.Schiffer, D.V.Shetty

Structure of 14C and 14B from the 14, 15C(d, 3He)13, 14B reactions

NUCLEAR REACTIONS 14C(d, 3He)13B, E=17.1 MeV/nucleon; 15C(d, 3He)14B, E=15.6 MeV/nucleon, [secondary 15C beam from 2H(14C, 15C) primary reaction]; measured 3He spectra, σ(θ) using helical orbit spectrometer (HELIOS) at ANL facility. DWBA analysis of σ(θ) data. 13,14B; deduced levels, J, π, l-transfers, spectroscopic factors, configurations. Comparison with previous experimental data and shell-model calculations with WBT and WBP interactions using the code NUSHELLX. 14,15C, 13,14B; calculated shell-model occupation numbers.

doi: 10.1103/PhysRevC.93.044323
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2235. Data from this article have been entered in the XUNDL database. For more information, click here.


2016CU02      Phys.Rev. C 94, 034313 (2016)

N.Curtis, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, M.Freer, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman

8Be + 8Be and 12C + α breakup states in 16O populated via the 13C(4He, 4α)n reaction

NUCLEAR REACTIONS 13C(α, 16O), E=22.0, 27.0, 27.5, 28.0 MeV; measured reaction products using four position-sensitive double-sided Si strip detectors, at Notre Dame FN Tandem accelerator facility. 16O; deduced levels identified through the 8Be+8Be and 12C*+α channels, J, π, centroids, cross sections. Comparison with previous studies using 12C(α, 8Be)8Be and 12C(16O, 4α)12C reactions. Relevance to 4α chain structure in 16O.

doi: 10.1103/PhysRevC.94.034313
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2239. Data from this article have been entered in the XUNDL database. For more information, click here.


2016MU06      Phys.Rev. C 93, 065803 (2016)

M.Munch, M.Alcorta, H.O.U.Fynbo, M.Albers, S.Almaraz-Calderon, M.L.Avila, A.D.Ayangeakaa, B.B.Back, P.F.Bertone, P.F.F.Carnelli, M.P.Carpenter, C.J.Chiara, J.A.Clark, B.DiGiovine, J.P.Greene, J.L.Harker, C.R.Hoffman, N.J.Hubbard, C.L.Jiang, O.S.Kirsebom, T.Lauritsen, K.L.Laursen, S.T.Marley, C.Nair, O.Nusair, D.Santiago-Gonzalez, J.Sethi, D.Seweryniak, R.Talwar, C.Ugalde, S.Zhu

Independent measurement of the Hoyle state β feeding from 12B using Gammasphere

RADIOACTIVITY 12B(β-)[from 2H(11B, p), E=40 MeV from ATLAS-ANL facility]; measured Eγ, Iγ, γγ-coin, γγ(θ) for the Hoyle state using Gammasphere array. 12C; deduced first excited 2+ and 0+ levels, β branching ratio to the Hoyle state in 12C, logft, indication of higher clustering for the Hoyle state as compared to previous results. Comparison with theoretical calculations using antisymmetrized molecular dynamics (AMD), and with previous experimental results.

doi: 10.1103/PhysRevC.93.065803
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Data from this article have been entered in the XUNDL database. For more information, click here.


2016SM02      Phys.Rev. C 94, 014320 (2016)

R.Smith, C.Wheldon, M.Freer, N.Curtis, Tz.Kokalova, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, V.A.Ziman

Evidence for a 3.8 MeV state in 9Be

NUCLEAR REACTIONS 9Be(α, n3α), E=22, 26 MeV; measured Eα, Iα using an array of double-sided silicon strip detectors (DSSSDs) at the Notre Dame FN Tandem Van de Graaff accelerator facility; extracted sum energy spectra for all four final-state particles, assumed to be 3α+n, 9Be excitation spectrum. 9Be; deduced levels, new state at 3.8 MeV, J, π, width, ratios of reduced widths to Wigner limits (decays to 8Be ground state). 9Be, 9B; comparison of levels and widths in mirror nuclei.

doi: 10.1103/PhysRevC.94.014320
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Data from this article have been entered in the XUNDL database. For more information, click here.


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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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2168.


2015JI05      Phys.Rev. C 91, 044602 (2015)

C.L.Jiang, A.M.Stefanini, H.Esbensen, K.E.Rehm, S.Almaraz-Calderon, M.L.Avila, B.B.Back, D.Bourgin, L.Corradi, S.Courtin, E.Fioretto, F.Galtarossa, A.Goasduff, F.Haas, M.M.Mazzocco, D.Montanari, G.Montagnoli, T.Mijatovic, R.Sagaidak, D.Santiago-Gonzalez, F.Scarlassara, E.E.Strano, S.Szilner

Fusion reactions of 58, 64Ni+124Sn

NUCLEAR REACTIONS 124Sn(58Ni, X), (64Ni, X), E(cm)=140-165 MeV; measured evaporation residue spectra, fusion σ(E), σ(θ). Coupled-channels calculations to study reaction mechanism. Discussed role of transfer reactions in heavy system, and S-factor maximum. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.91.044602
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0774.


2014AL06      Phys.Rev.Lett. 112, 152701 (2014)

S.Almaraz-Calderon, P.F.Bertone, M.Alcorta, M.Albers, C.M.Deibel, C.R.Hoffman, C.L.Jiang, S.T.Marley, K.E.Rehm, C.Ugalde

Direct Measurement of the 23Na(α, p)26Mg Reaction Cross Section at Energies Relevant for the Production of Galactic 26Al

NUCLEAR REACTIONS 4He(23Na, p)26Mg, E=23, 26, 28, 30 MeV; measured reaction products, Ep, Ip; deduced σ, reaction rates. Comparison with available data.

doi: 10.1103/PhysRevLett.112.152701
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2014CA08      Phys.Rev.Lett. 112, 192701 (2014)

P.F.F.Carnelli, S.Almaraz-Calderon, K.E.Rehm, M.Albers, M.Alcorta, P.F.Bertone, B.Digiovine, H.Esbensen, J.O.Fernandez Niello, D.Henderson, C.L.Jiang, J.Lai, S.T.Marley, O.Nusair, T.Palchan-Hazan, R.C.Pardo, M.Paul, C.Ugalde

Measurements of Fusion Reactions of Low-Intensity Radioactive Carbon Beams on 12C and their Implications for the Understanding of X-Ray Bursts

NUCLEAR REACTIONS 12C(10C, X), (12C, X), (13C, X), (14C, X), (15C, X), E=40-50 MeV; measured fusion reaction products; deduced S-factors, σ. Time-dependent HF calculations.

doi: 10.1103/PhysRevLett.112.192701
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2014JI04      Phys.Rev.Lett. 113, 022701 (2014)

C.L.Jiang, A.M.Stefanini, H.Esbensen, K.E.Rehm, S.Almaraz-Calderon, B.B.Back, L.Corradi, E.Fioretto, G.Montagnoli, F.Scarlassara, D.Montanari, S.Courtin, D.Bourgin, F.Haas, A.Goasduff, S.Szilner, T.Mijatovic

Fusion Hindrance for a Positive-Q-Value System 24Mg + 30Si

NUCLEAR REACTIONS 30Si(24Mg, X), E<30 MeV; measured fusion reaction products; deduced σ, S-factors.

doi: 10.1103/PhysRevLett.113.022701
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2014WU10      Phys.Rev. C 90, 061301 (2014)

A.H.Wuosmaa, J.P.Schiffer, S.Bedoor, M.Albers, M.Alcorta, S.Almaraz-Calderon, B.B.Back, P.F.Bertone, C.M.Deibel, C.R.Hoffman, J.C.Lighthall, S.T.Marley, R.C.Pardo, K.E.Rehm, D.V.Shetty

Stretched states in 12, 13B with the (d, α) reaction

NUCLEAR REACTIONS 2H(14C, α)12B, E=17.1 MeV/nucleon; 2H(15C, α)13B, E=15.7 MeV/nucleon, [secondary 15C beam from 2H(14C, 15C) primary reaction]; measured Eα, Iα, 12,13B spectra, (12B)α-, (13B)α-coin, σ(θ) using Helical Orbit Spectrometer (HELIOS) and Si detector telescopes at ATLAS-ANL facility. 12,13B; deduced levels, J, π, configuration. DWBA analysis. Population of stretched 3+ states.

doi: 10.1103/PhysRevC.90.061301
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2013CU04      Phys.Rev. C 88, 064309 (2013)

N.Curtis, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, M.Freer, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman

Investigation of the 4α linear chain state in 16O

NUCLEAR REACTIONS 12C(α, 8Be)8Be, (α, 12C), [12C* decaying to 8Be+α], E=12.2-20.0 MeV; measured Eα, Iα, α(θ), αα-coin, σ(E, θ) at Notre Dame FN tandem facility. Phase shift analysis of σ(θ) data. 16O; deduced levels, resonances, J. Comparison with previous experimental results. No evidence found for rigid, 4α-linear chain in 16O.

doi: 10.1103/PhysRevC.88.064309
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2013HO21      Phys.Rev. C 88, 044317 (2013)

C.R.Hoffman, M.Albers, M.Alcorta, S.Almaraz-Calderon, B.B.Back, S.I.Baker, S.Bedoor, P.F.Bertone, B.P.Kay, J.C.Lighthall, T.Palchan, R.C.Pardo, G.Perdikakis, K.E.Rehm, A.M.Rogers, D.Santiago-Gonzalez, C.Yuan, J.P.Schiffer

Single-neutron excitations in 18N

NUCLEAR REACTIONS 2H(17N, p), [17N secondary beam from 9Be(18O, X), E=14.7 MeV/nucleon primary reaction], E=13.6 MeV/nucleon; measured E(p), I(p), σ(θ) using HELIOS spectrometer and array at ATLAS-ANL facility. 18N; deduced levels, J, π, l-transfer, spectroscopic factors, spectroscopic strengths, configuration. DWBA analysis of σ(θ) data for (d, p) reaction in inverse kinematics. 17C, 18N, 19O; systematics of low-lying states in N=11 isotones, and comparison with shell-model calculations.

doi: 10.1103/PhysRevC.88.044317
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2013KO15      Phys.Rev. C 87, 057309 (2013)

Tz.Kokalova, M.Freer, N.Curtis, N.I.Ashwood, M.Barr, J.D.Malcolm, C.Wheldon, V.A.Ziman, S.Almaraz-Calderon, A.Aprahamian, B.Bucher, M.Couder, X.Fang, F.Jung, W.Lu, A.Roberts, W.P.Tan, P.Copp, S.R.Lesher

Yield measurements for resonances above the multi-α threshold in 20Ne

NUCLEAR REACTIONS 16O(α, X), E=23.0-29.0 MeV; measured α and particle spectra, (particle)(particle)α-coin, yields for 8Be+8Be+α, and 8Be+12C(second 0+) channels. Measurements at Notre Dame facility. 20Ne; deduced levels, resonances, J. Monte Carlo simulations.

doi: 10.1103/PhysRevC.87.057309
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2012AL11      Phys.Rev. C 86, 025801 (2012); Pub.Note. Phys.Rev. C 86, 029901 (2012)

S.Almaraz-Calderon, W.P.Tan, A.Aprahamian, B.Bucher, A.Roberts, M.Wiescher, C.R.Brune, T.N.Massey, N.Ozkan, R.T.Guray, H.Mach

Level structure of 18Ne and its importance in the 14O(α, p)17F reaction rate

NUCLEAR REACTIONS 16O(3He, n), E=15 MeV; measured neutron and charged particle spectra, (particle)n-coin, neutron time-of-flight spectrum, p(θ), branching ratios for proton, 2p and α decays of excited states. 18Ne; deduced levels, resonances, J, π, decay modes, widths. 14,16O, 17F; populated g.s. from p, 2p and α decays of 18Ne resonances, and first excited state in 17F from p decay of 18Ne resonances. 14O(α, p)17F, T=0.1-5 GK; calculated reaction rates of astrophysical interest for Hot CNO cycles and their breakout paths towards the rp process. Comparison with previous studies.

doi: 10.1103/PhysRevC.86.025801
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2012AL23      Phys.Rev. C 86, 065805 (2012); Erratum Phys.Rev. C 88, 059902 (2013)

S.Almaraz-Calderon, W.P.Tan, A.Aprahamian, M.Beard, G.P.A.Berg, B.Bucher, M.Couder, J.Gorres, S.O'Brien, D.Patel, A.Roberts, K.Sault, M.Wiescher, C.R.Brune, T.N.Massey, K.Fujita, K.Hatanaka, D.Ishiwaka, H.Matsubara, H.Okamura, H.J.Ong, Y.Sakemi, Y.Shimizu, T.Suzuki, Y.Tameshige, A.Tamii, J.Zenihiro, T.Kubo, Y.Namiki, Y.Ohkuma, Y.Shimbara, S.Suzuki, R.Watanabe, R.Yamada, T.Adachi, Y.Fujita, H.Fujita, M.Dozono, T.Wakasa

Level structure of 30S and its importance in the 26Si(α, p)29P and 29P(p, γ)30S reaction rates

NUCLEAR REACTIONS 32S(p, t), E=98.7 MeV; measured triton spectra at two angles using Grand Raiden (GR) magnetic spectrometer at RCNP facility. 28Si(3He, n), E=15 MeV; measured neutron (TOF) spectra, charged-particle spectra, (charged-particle)n-coin, angular distributions using LESA array and scintillation detectors at Notre Dame NSL facility. 30S; deduced levels, proton- and α- unbound levels, J, π, proton branching ratios, partial proton widths. DWBA analysis. Comparison with several previous experimental studies. 29P(p, γ)30S, 26Si(α, p)29P, T9=0.01-10 GK; deduced astrophysical reaction rates. Comparison with previous theoretical calculations. Contribution of resonances to total reaction rates.

doi: 10.1103/PhysRevC.86.065805
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2012BU19      J.Phys.:Conf.Ser. 381, 012121 (2012)

B.Bucher, J.Browne, S.Almaraz-Calderon, A.Alongi, A.D.Ayangeakaa, A.Best, M.Couder, J.DeBoer, X.Fang, W.Lu, M.Notani, D.Patel, N.Paul, A.Roberts, R.Talwar, W.Tan, X.D.Tang, A.Villano

The Role of 12C(12C, n) in the Astrophysical S-Process

NUCLEAR REACTIONS 12C(12C, n), E(cm)=3.54-8.74 MeV; measured thin and thick target (4.23-8.74 MeV and 3.54-4.74 MeV, respectively) β-delayed γ rays; deduced modified S-factor, reaction rates. Compared with other data and predictions.

doi: 10.1088/1742-6596/381/1/012121
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2012CU04      J.Phys.:Conf.Ser. 381, 012079 (2012)

N.Curtis, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, M.Freer, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman

Does a 4-α linear chain exist in 16O?

NUCLEAR REACTIONS 12C(α, 8Be), E=12.2-20.0 MeV; measured Eα, Iα from 8Be decay using DSSSD; deduced σ(θ=900), doublet 6+ resonance and its components.

doi: 10.1088/1742-6596/381/1/012079
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2012FR11      J.Phys.:Conf.Ser. 381, 012009 (2012)

M.Freer, S.Almaraz-Calderon, J.Carter, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, N.Curtis, X.Fang, F.Jung, S.Lesher, W.Lu, J.D.Malcolm, A.Roberts, R.Smit, W.P.Tan, C.Wheldon, V.A.Ziman

Simplicity from Complexity

doi: 10.1088/1742-6596/381/1/012009
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2011FR02      Phys.Rev. C 83, 034314 (2011)

M.Freer, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, N.Curtis, X.Fang, F.Jung, S.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman

Evidence for a new 12C state at 13.3 MeV

NUCLEAR REACTIONS 9Be, 12C(α, 3α), E=22-30 MeV; measured Eα, Iα, 12C-α angular correlations; deduced Dalitz plot. 12C; deduced levels, J, π, width. Possible collective excitation of Hoyle state.

doi: 10.1103/PhysRevC.83.034314
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