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NSR database version of April 26, 2024.

Search: Author = D.Walter

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2023WI02      Phys.Rev. C 107, 035803 (2023)

M.Williams, B.Davids, G.Lotay, N.Nishimura, T.Rauscher, S.A.Gillespie, M.Alcorta, A.M.Amthor, G.C.Ball, S.S.Bhattacharjee, V.Bildstein, W.N.Catford, D.T.Doherty, N.E.Esker, A.B.Garnsworthy, G.Hackman, K.Hudson, A.Lennarz, C.Natzke, B.Olaizola, A.Psaltis, C.E.Svensson, J.Williams, D.Walter, D.Yates

Cross sections of the ⁸³Rb(p, γ)⁸⁴Sr and ⁸⁴Kr(p, γ)⁸⁵Rb reactions at energies characteristic of the astrophysical γ process

NUCLEAR REACTIONS ¹H(⁸³Rb, γ)⁸⁴Sr, E=2.4, 2.7 MeV/nucleon; ¹H(⁸⁴Kr, γ)⁸⁵Rb, E=2.7 MeV/nucleon; measured Eγ, Iγ, (recoil)γ-coin; deduced σ(E). ¹H(⁸³Rb, γ)⁸⁴Sr, E=2.4, 2.7 MeV/nucleon; deduced thermonuclear reaction rate. Comparison to SMARAGD and NON-SMOKER calculations. Relevance to the abundance of ⁸⁴Sr produced during the γ process in supernovae. The EMMA recoil mass spectrometer with 12 Compton-suppressed HPGe detectors of the TIGRESS array at ISAC-II facility of TRIUMF.

doi: 10.1103/PhysRevC.107.035803
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2021LO11      Phys.Rev.Lett. 127, 112701 (2021)

G.Lotay, S.A.Gillespie, M.Williams, T.Rauscher, M.Alcorta, A.M.Amthor, C.A.Andreoiu, D.Baal, G.C.Ball, S.S.Bhattacharjee, H.Behnamian, V.Bildstein, C.Burbadge, W.N.Catford, D.T.Doherty, N.E.Esker, F.H.Garcia, A.B.Garnsworthy, G.Hackman, S.Hallam, K.A.Hudson, S.Jazrawi, E.Kasanda, A.R.L.Kennington, Y.H.Kim, A.Lennarz, R.S.Lubna, C.R.Natzke, N.Nishimura, B.Olaizola, C.Paxman, A.Psaltis, C.E.Svensson, J.Williams, B.Wallis, D.Yates, D.Walter, B.Davids

First Direct Measurement of an Astrophysical p-Process Reaction Cross Section Using a Radioactive Ion Beam

NUCLEAR REACTIONS ¹H(⁸³Rb, γ), (⁸⁴Kr, γ), E=2.4, 2.7 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, partial σ. Comparison with statistical model calculations.

doi: 10.1103/PhysRevLett.127.112701
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2660.

2020HA03      Phys.Rev. C 101, 015804 (2020)

M.R.Hall, D.W.Bardayan, T.Baugher, A.Lepailleur, S.D.Pain, A.Ratkiewicz, S.Ahn, J.M.Allen, J.T.Anderson, A.D.Ayangeakaa, J.C.Blackmon, S.Burcher, M.P.Carpenter, S.M.Cha, K.Y.Chae, K.A.Chipps, J.A.Cizewski, M.Febbraro, O.Hall, J.Hu, C.L.Jiang, K.L.Jones, E.J.Lee, P.D.O'Malley, S.Ota, B.C.Rasco, D.Santiago-Gonzalez, D.Seweryniak, H.Sims, K.Smith, W.P.Tan, P.Thompson, C.Thornsberry, R.L.Varner, D.Walter, G.L.Wilson, S.Zhu

γ-ray spectroscopy of astrophysically important states in ³⁹Ca

NUCLEAR REACTIONS ⁴⁰Ca(³He, αγ)³⁹Ca, E=30 MeV; Measured Eγ, Iγ, Eα, Iα, αγ-coin, reaction products using the GODDESS array (Gammasphere for γ detection and ORRUBA for particle detection) at the ATLAS-ANL facility. ³⁹Ca; deduced levels, J, π, γ-branching ratios. ³⁸K(p, γ)³⁹Ca, T=0.1-0.4 GK; deduced resonance parameters, astrophysical reaction rates. Discussed impact on abundances of isotopes created at the endpoint of nova nucleosynthesis.

doi: 10.1103/PhysRevC.101.015804
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2454. Data from this article have been entered in the XUNDL database. For more information, click here.

2020HA31      Phys.Rev. C 102, 045802 (2020)

M.R.Hall, D.W.Bardayan, T.Baugher, A.Lepailleur, S.D.Pain, A.Ratkiewicz, S.Ahn, J.M.Allen, J.T.Anderson, A.D.Ayangeakaa, J.C.Blackmon, S.Burcher, M.P.Carpenter, S.M.Cha, K.Y.Chae, K.A.Chipps, J.A.Cizewski, M.Febbraro, O.Hall, J.Hu, C.L.Jiang, K.L.Jones, E.J.Lee, P.D.O'Malley, S.Ota, B.C.Rasco, D.Santiago-Gonzalez, D.Seweryniak, H.Sims, K.Smith, W.P.Tan, P.Thompson, C.Thornsberry, R.L.Varner, D.Walter, G.L.Wilson, S.Zhu

¹⁹Ne level structure for explosive nucleosynthesis

NUCLEAR REACTIONS ¹⁹F(³He, t)¹⁹Ne, E=30 MeV; measured reaction products, E(t), I(t), Eγ, Iγ, (triton)γ-, and (triton)γγ-coin using ORRUBA array with Micron QQQ5 telescopes for tritons and Gammasphere array for γ rays at ATLAS-ANL facility. ¹⁹Ne; deduced levels, J, π, γ-branching ratios. Comparison with earlier experimental results and with evaluated data. ¹⁸F(p, α)¹⁵O, E(cm)<0.9 MeV; calculated astrophysical S factors, and reaction rates at temperature of 0.06 to 0.4 GK.

doi: 10.1103/PhysRevC.102.045802
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Data from this article have been entered in the XUNDL database. For more information, click here.

2020MU07      Phys.Rev. C 101, 055801 (2020)

M.Munch, C.Matei, S.D.Pain, M.T.Febbraro, K.A.Chipps, H.J.Karwowski, C.Aa.Diget, A.Pappalardo, S.Chesnevskaya, G.L.Guardo, D.Walter, D.L.Balabanski, F.D.Becchetti, C.R.Brune, K.Y.Chae, J.Frost-Schenk, M.J.Kim, M.S.Kwag, M.La Cognata, D.Lattuada, R.G.Pizzone, G.G.Rapisarda, G.V.Turturica, C.A.Ur, Y.Xu

Measurement of the ⁷Li(γ, t)⁴He ground-state cross section between E_γ = 4.4. and 10 MeV

NUCLEAR REACTIONS ⁷Li(γ, t), E=4.4-10 MeV from High Intensity Gamma-ray Source (HIγS) at TUNL; measured E(t), I(t), Eα, Iα, Eγ and Iγ, αt-coin, ground state σ(E) using the SIDAR silicon detector array. ³H(α, γ), E(cm)=0-7 MeV; deduced astrophysical S-factor from R-matrix analysis. Comparison with model predictions, and with previous experimental results. Relevance to primordial Li problem and the mirror α-capture reactions.

doi: 10.1103/PhysRevC.101.055801
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetL0260. Data from this article have been entered in the XUNDL database. For more information, click here.

2019HA08      Phys.Rev.Lett. 122, 052701 (2019)

M.R.Hall, D.W.Bardayan, T.Baugher, A.Lepailleur, S.D.Pain, A.Ratkiewicz, S.Ahn, J.M.Allen, J.T.Anderson, A.D.Ayangeakaa, J.C.Blackmon, S.Burcher, M.P.Carpenter, S.M.Cha, K.Y.Chae, K.A.Chipps, J.A.Cizewski, M.Febbraro, O.Hall, J.Hu, C.L.Jiang, K.L.Jones, E.J.Lee, P.D.O'Malley, S.Ota, B.C.Rasco, D.Santiago-Gonzalez, D.Seweryniak, H.Sims, K.Smith, W.P.Tan, P.Thompson, C.Thornsberry, R.L.Varner, D.Walter, G.L.Wilson, S.Zhu

Key ¹⁹Ne States Identified Affecting γ-Ray Emission from ¹⁸F in Novae

NUCLEAR REACTIONS ¹⁹F(³He, t)¹⁹Ne, E=30 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, S-factor, reaction rates, resonance energies. Comparison with available data.

doi: 10.1103/PhysRevLett.122.052701
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Data from this article have been entered in the XUNDL database. For more information, click here.

2019HA14      Phys.Rev. C 99, 035805 (2019)

M.R.Hall, D.W.Bardayan, T.Baugher, A.Lepailleur, S.D.Pain, A.Ratkiewicz, S.Ahn, J.M.Allen, J.T.Anderson, A.D.Ayangeakaa, J.C.Blackmon, S.Burcher, M.P.Carpenter, S.M.Cha, K.Y.Chae, K.A.Chipps, J.A.Cizewski, M.Febbraro, O.Hall, J.Hu, C.L.Jiang, K.L.Jones, E.J.Lee, P.D.O'Malley, S.Ota, B.C.Rasco, D.Santiago-Gonzalez, D.Seweryniak, H.Sims, K.Smith, W.P.Tan, P.Thompson, C.Thornsberry, R.L.Varner, D.Walter, G.L.Wilson, S.Zhu

New γ-ray transitions observed in ¹⁹Ne with implications for the ¹⁵O(α, γ)¹⁹Ne reaction rate

NUCLEAR REACTIONS ¹⁹F(³He, t), E=30 MeV; measured triton spectra, Eγ, Iγ, tγ- and γγ-coin using Gammasphere array for γ detection with the silicon detector array ORRUBA Dual Detectors for Experimental Structure Studies (GODDESS) at ATLAS-ANL facility. ¹⁹Ne; deduced levels, J, π, and γ-branching ratios for the decay of 4.14- and 4.20-MeV states. ¹⁵O(α, γ)¹⁹Ne, E≈18-180 keV; calculated fractional contribution of the corrected branching ratios for the 4.14 MeV, 7/2- and 4.20 MeV, 9/2- states in ¹⁹Ne to astrophysical reaction rate, which is of significance in breakout from the hot CNO cycle in type I x-ray bursts. Comparison with previous experimental values.

doi: 10.1103/PhysRevC.99.035805
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Data from this article have been entered in the XUNDL database. For more information, click here.

2019WA18      Phys.Rev. C 99, 054625 (2019)

D.Walter, S.D.Pain, J.A.Cizewski, F.M.Nunes, S.Ahn, T.Baugher, D.W.Bardayan, T.Baumann, D.Bazin, S.Burcher, K.A.Chipps, G.Cerizza, K.L.Jones, R.L.Kozub, S.J.Lonsdale, B.Manning, F.Montes, P.D.O'Malley, S.Ota, J.Pereira, A.Ratkiewicz, P.Thompson, C.Thornsberry, S.Williams

Constraining spectroscopic factors near the r-process path using combined measurements: ⁸⁶Kr (d, p) ⁸⁷Kr

NUCLEAR REACTIONS ²H(⁸⁶Kr, p), E=33 MeV/nucleon; measured Ep, Ip, recoils, (recoils)p-coin, differential σ(θ) using the Oak Ridge Rutgers University Barrel Array (ORRUBA) coupled to the S800 magnetic spectrograph at the NSCL-MSU facility. ⁸⁷Kr; deduced levels, J, π, L-transfer, single-particle asymptotic normalization coefficients (ANCs) and spectroscopic factors for the ground, first 1/2+, and 7/2+ states. Comparison with FR-ADWA analysis with KD optical model parameters, and with previous experimental results at E=5.5 MeV/nucleon.

doi: 10.1103/PhysRevC.99.054625
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2694. Data from this article have been entered in the XUNDL database. For more information, click here.

2018JO04      Acta Phys.Pol. B49, 365 (2018)

K.L.Jones, C.Thornsberry, J.Allen, A.Atencio, D.W.Bardayan, D.Blankstein, S.Burcher, A.B.Carter, K.A.Chipps, J.A.Cizewski, I.Cox, Z.Elledge, M.Febbraro, A.Fijalkowska, R.Grzywacz, M.R.Hall, T.T.King, A.Lepailleur, M.Madurga, S.T.Marley, P.D.O'Malley, S.V.Paulauskas, S.D.Pain, W.A.Peters, C.Reingold, K.Smith, S.Taylor, W.Tan, M.Vostinar, D.Walter

Development of the (d, n) Proton-transfer Reaction in Inverse Kinematics for Structure Studies

doi: 10.5506/aphyspolb.49.365
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2018SM01      Nucl.Instrum.Methods Phys.Res. B414, 190 (2018)

K.Smith, T.Baugher, S.Burcher, A.B.Carter, J.A.Cizewski, K.A.Chipps, M.Febbraro, R.Grzywacz, K.L.Jones, S.Munoz, S.D.Pain, S.V.Paulauskas, A.Ratkiewicz, K.T.Schmitt, C.Thornsberry, R.Toomey, D.Walter, H.Willoughby

First data with the Hybrid Array of Gamma Ray Detector (HAGRiD)

NUCLEAR REACTIONS ¹⁴N(α, p), ¹³C(α, n), E not given; measured reaction products, Eγ, Iγ, En, In; deduced yields.

doi: 10.1016/j.nimb.2017.06.028
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Data from this article have been entered in the XUNDL database. For more information, click here.