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Search: Author = W.A.Richter

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2020AM08      Eur.Phys.J. A 56, 284 (2020)

K.Amos, S.Karataglidis, W.A.Richter

Charge exchange (p, n) reaction to isobaric analogue states of select nuclei

NUCLEAR REACTIONS ⁹⁰Zr(p, p), (p, n), E=45 MeV; ^42,44,48Ca(p, p), (p, n), E=35 MeV; ²⁰⁸Pb(p, p), (p, n), E=45 MeV; analyzed available data; deduced isobaric analogue state (IAS) of ground states of the nuclei, spectroscopic parameters using DWBA98 code.

doi: 10.1140/epja/s10050-020-00278-7
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2020RI06      Phys.Rev. C 102, 025801 (2020)

W.A.Richter, B.A.Brown, R.Longland, C.Wrede, P.Denissenkov, C.Fry, F.Herwig, D.Kurtulgil, M.Pignatari, R.Reifarth

Shell-model studies of the astrophysical rp-process reactions ³⁴S(p, γ)³⁵Cl and ^{34g, m}Cl(p, γ)³⁵Ar

NUCLEAR REACTIONS ³⁴S(³He, d)³⁵Cl, E=20 MeV; calculated spectroscopic factors for levels in ³⁵Cl up to 7.4 MeV using shell model, and compared with experimental values. ³⁴S(p, γ)³⁵Cl, ^34,34mCl(p, γ)³⁵Ar, E not given; calculated levels, resonances, J, π, spectroscopic factors, Γ_p, Γ_γ, resonance strengths, thermonuclear reaction rates; discussed impact on predicted ³⁴S/³²S isotopic ratio for presolar nova grains. Comparison with experimental data. Shell-model approach, with uncertainties estimated using a Monte Carlo method.

doi: 10.1103/PhysRevC.102.025801
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2019WO01      Phys.Rev.Lett. 122, 232701 (2019)

C.Wolf, C.Langer, F.Montes, J.Pereira, W.-J.Ong, T.Poxon-Pearson, S.Ahn, S.Ayoub, T.Baumann, D.Bazin, P.C.Bender, B.A.Brown, J.Browne, H.Crawford, R.H.Cyburt, E.Deleeuw, B.Elman, S.Fiebiger, A.Gade, P.Gastis, S.Lipschutz, B.Longfellow, Z.Meisel, F.M.Nunes, G.Perdikakis, R.Reifarth, W.A.Richter, H.Schatz, K.Schmidt, J.Schmitt, C.Sullivan, R.Titus, D.Weisshaar, P.J.Woods, J.C.Zamora, R.G.T.Zegers

Constraining the Neutron Star Compactness: Extraction ²³Al(p, γ) Reaction Rate for the rp Process

NUCLEAR REACTIONS ²H(²³Al, n), E=48 MeV/nucleon; measured reaction products, En, In, Eγ, Iγ; deduced J, π, σ, σ(θ), resonance widths and spectroscopic strengths, reaction rates.

doi: 10.1103/PhysRevLett.122.232701
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2458. Data from this article have been entered in the XUNDL database. For more information, click here.

2018LO10      Phys.Rev. C 97, 054307 (2018)

B.Longfellow, A.Gade, B.A.Brown, W.A.Richter, D.Bazin, P.C.Bender, M.Bowry, B.Elman, E.Lunderberg, D.Weisshaar, S.J.Williams

Measurement of key resonances for the ²⁴Al(p, γ) ²⁵Si reaction rate using in-beam γ-ray spectroscopy

NUCLEAR REACTIONS ⁹Be(²⁶Si, ²⁵Si), E=118 MeV/nucleon; ⁹Be(²⁵Al, ²⁵Si), E=111 MeV/nucleon, [secondary ²⁵Al and ²⁶Si beams from ⁹Be(³⁶Ar, X), E=150 MeV/nucleon primary reaction, and using A1900 fragment separator]; measured reaction products, yields, Eγ, Iγ, γγ- and (particle)γ-coin using S800 spectrograph for particles, and the CAESAR and SeGA arrays for γ detection at NSCL-MSU. ²⁵Si; deduced levels, J, π, and γ-decay branching ratios, and compared with experimental levels for mirror nucleus ²⁵Na, and with USDB+CD shell-model calculations. ²⁴Al(p, γ)²⁵Si, T=0.1-10 GK; calculated astrophysical reaction rates using the experimental states and states from charge-dependent USDA and USDB shell-model calculations. Comparison with other theoretical reaction rates.

doi: 10.1103/PhysRevC.97.054307
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2017SM02      Phys.Rev. C 95, 054301 (2017)

N.A.Smirnova, B.Blank, B.A.Brown, W.A.Richter, N.Benouaret, Y.H.Lam

Isospin mixing from β-delayed proton emission

RADIOACTIVITY ⁴⁴Cr, ⁴⁸Fe(β⁺), (β⁺p); calculated half-lives of precursors, excitation energies and electromagnetic widths of the IAS in daughter nuclei, single-particle proton widths and shell-model spectroscopic factors; deduced isospin mixing in the IAS using experimental β-delayed proton to γ-emission branching ratios. ⁴⁴V, ⁴⁴Sc, ⁴⁸Mn, ⁴⁸V; calculated levels, J, π, and compared with experimental data. Shell model calculations using cdGX1A and cdKB3G effective interactions.

doi: 10.1103/PhysRevC.95.054301
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2017TR04      Phys.Rev. C 95, 035501 (2017)

S.Triambak, L.Phuthu, A.Garcia, G.C.Harper, J.N.Orce, D.A.Short, S.P.R.Steininger, A.Diaz Varela, R.Dunlop, D.S.Jamieson, W.A.Richter, G.C.Ball, P.E.Garrett, C.E.Svensson, C.Wrede

2⁺₁ to 3⁺₁ γ width in ²²Na and second class currents

NUCLEAR REACTIONS ²¹Ne(p, γ)²²Na, E=908, 1113 keV; measured Eγ, Iγ, γγ-coin using implanted ²¹Ne target, two HPGe detectors and a NaI(Tl) detector at CENPA FN tandem accelerator of University of Washington. ²²Na; deduced levels, precise width of first 2+ state with T=1 to T=0 3+ ground state transition, weak magnetism form factor for ²²Na β decay using the conserved vector current (CVC) hypothesis, and large induced-tensor form factor for the decay by using previous βγ(θ) results. Comparison with theoretical predictions.

doi: 10.1103/PhysRevC.95.035501
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2016SM01      Phys.Rev. C 93, 044305 (2016)

N.A.Smirnova, B.Blank, B.A.Brown, W.A.Richter, N.Benouaret, Y.H.Lam

Theoretical analysis of isospin mixing with the β decay of ⁵⁶Zn

RADIOACTIVITY ⁵⁶Zn(β⁺), (β⁺p); calculated half-life of T_z=-2 ⁵⁶Zn ground state, T_z=-1 energy levels and Jπ and lowest 0+ states in ⁵⁶Cu, T=2 IAS in ⁵⁶Cu, theoretical Iβ of the IAS, levels and Jπ of ⁵⁵Ni, proton and gamma widths, isospin mixing in the IAS, spectroscopic factor for proton emission. Explained highly retarded proton decay of the IAS in ⁵⁶Cu. Shell-model calculations using isospin nonconserving Hamiltonians based on the cdGX1A and cdKB3G interactions. Comparison with available experimental data.

doi: 10.1103/PhysRevC.93.044305
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2015SW01      Phys.Rev. C 91, 034317 (2015)

J.A.Swartz, B.A.Brown, P.Papka, F.D.Smit, R.Neveling, E.Z.Buthelezi, S.V.Fortsch, M.Freer, Tz.Kokalova, J.P.Mira, F.Nemulodi, J.N.Orce, W.A.Richter, G.F.Steyn

Spectroscopy of narrow, high-lying, low-spin states in ²⁰Ne

NUCLEAR REACTIONS ²²Ne(p, t), E=60 MeV; measured triton spectra, σ(θ) using QDD magnetic spectrometer at iThemba Labs. ²⁰Ne; deduced levels, J, π, possible 5α cluster state, isospin T=2 states in ²⁰Ne, ²⁰O and ²⁰F. Comparison of angular distributions with calculations using FRESCO code, and structure data with shell-model calculations using OXBASH code.

doi: 10.1103/PhysRevC.91.034317
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0768. Data from this article have been entered in the XUNDL database. For more information, click here.

2014BR10      Phys.Rev. C 89, 062801 (2014);Erratum Phys.Rev. C 92, 069901 (2015)

B.A.Brown, W.A.Richter, C.Wrede

Shell-model studies of the astrophysical rapid-proton-capture reaction ³⁰P(p, γ)³¹S

NUCLEAR STRUCTURE ³¹S; calculated levels above 5.9 MeV, J, π, proton widths, spectroscopic factors. Comparison with experimental and evaluated data.

NUCLEAR REACTIONS ³⁰P(p, γ)³¹S, T=0.1-1 GK; calculated thermonuclear reaction rates for negative and positive parity final states. Comparison with other calculations. Discussed large uncertainties in calculating the reaction rate due to non-observation of predicted 1/2- states in astrophysically significant resonance region.

doi: 10.1103/PhysRevC.89.062801
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2014PA50      Eur.Phys.J. A 50, 158 (2014)

P.Papka, J.F.Sharpey-Schafer, B.A.Brown, T.S.Dinoko, E.A.M.A.Khaleel, E.A.Lawrie, J.J.Lawrie, K.C.W.Li, S.N.T.Majola, W.A.Richter, O.Shirinda, M.A.Stankiewicz, P.Vymers, M.Wiedeking

High-resolution two-proton stripping to 2p-1h 7/2^- states via the ⁵⁹Co(³He, n γ)⁶¹Cu reaction

NUCLEAR REACTIONS ⁵⁹Co(³He, nγ), E=22.5 MeV; measured Eγ, Iγ, nγ-coin using AFRODITE escape-suppressed spectrometer, HPGe Clover detectors in BGO shields, neutrons using NE102A plastic scintillators; deduced γ-ray spectra, coincidence n-γ spectra, gated γ spectra, population strengths, branching ratio, levels, J, π, γ transitions, single-proton states outside ⁶⁰Ni.

doi: 10.1140/epja/i2014-14158-x
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2013JE04      Phys.Rev. C 87, 064301 (2013)

D.G.Jenkins, M.Bouhelal, S.Courtin, M.Freer, B.R.Fulton, F.Haas, R.V.F.Janssens, T.L.Khoo, C.J.Lister, E.F.Moore, W.A.Richter, B.Truett, A.H.Wuosmaa

γ-ray spectroscopy of the A=23 T=1/2 nuclei ²³Na and ²³Mg: High-spin states, mirror symmetry, and applications to nuclear astrophysical reaction rates

NUCLEAR REACTIONS ¹²C(¹²C, p), E=16 MeV; ¹²C(¹²C, n), E=22 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO), level half-lives by DSAM using Gammasphere array at ATLAS-ANL facility. ²³Na, ²³Mg; deduced high-spin levels, J, π, bands, multipolarity, mirror energy differences, proton unbound states. Comparison to Shell-model calculations using PSPDF interaction. ²²Ne(p, γ)²³Mg; ²²Ne(p, γ)²³Na; discussed proton unbound states, Gamow window and impact on astrophysical applications.

doi: 10.1103/PhysRevC.87.064301
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2013RI05      Phys.Rev. C 87, 065803 (2013)

W.A.Richter, B.A.Brown

Shell-model studies of the astrophysical rp reaction ²⁹P(p, γ)³⁰S

NUCLEAR REACTIONS ²⁹Si(d, p)³⁰Si, E not given; calculated spectroscopic factors using the shell-model with USDA and USDB interactions. ²⁹P(p, γ)³⁰S at T₉<10; calculated total rp reaction rates. Comparison with experimental data.

NUCLEAR STRUCTURE ³⁰S, ³¹Si; calculated levels, resonances, J, π, level half-lives, gamma and proton widths, c coefficients of IMME for T=1 states of ³⁰P, ³⁰Si and ³⁰S, resonance strengths, spectroscopic factors. Shell-model with USDA and USDB interactions, and IMME. Comparison with experimental data.

doi: 10.1103/PhysRevC.87.065803
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2012BR13      J.Phys.:Conf.Ser. 337, 012003 (2012)

B.A.Brown, W.A.Richter

Applications of the USD Hamiltonians to rapid-proton capture rates for sd-shell nuclei

NUCLEAR STRUCTURE ²⁶Si; calculated levels, J, π. Compared with ²⁶Si, ²⁶Mg data.

NUCLEAR REACTIONS ²⁵Al(p, γ), E≈10 keV-3 MeV; calculated resonance capture reaction rate, contribution of individual states. Compared USD, USDA, USDB.

doi: 10.1088/1742-6596/337/1/012003
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2012RI02      Phys.Rev. C 85, 045806 (2012)

W.A.Richter, B.A.Brown

Shell-model studies of the rp reaction ³⁵Ar(p, γ)³⁶K

NUCLEAR STRUCTURE ³⁶K, ³⁶Cl; analyzed and calculated levels, J, π, half-lives, spectroscopic factors, widths using isobaric mass multiplet equation (IMME), known energies of the T=1 analog states, and shell-model calculations based on USDA-CDPN and USDB-CDPN interactions. ³⁶K; reassignment of Jπ for some levels.

NUCLEAR REACTIONS ³⁵Cl(d, p)³⁶Cl; calculated spectroscopic factors from shell model based on USDA-CDPN and USDB-CDPN. Comparison with experimental data. ³⁵Ar(p, γ)³⁶K; calculated rp reaction rates.

doi: 10.1103/PhysRevC.85.045806
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2012RI07      Prog.Theor.Phys.(Kyoto), Suppl. 196, 340 (2012)

W.A.Richter, B.A.Brown

Calculation of rp-Process Rates in the sd Shell via the Nuclear Shell Model

NUCLEAR STRUCTURE ³⁶K; calculated energy levels, J, π. Isobaric Mass Multiplet Equation calculations.

NUCLEAR REACTIONS ³⁵Ar(p, γ)³⁶K, E<100 keV; calculated rp process reaction rate vs. temperature.

doi: 10.1143/PTPS.196.340
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2012RI10      J.Phys.:Conf.Ser. 381, 012113 (2012)

W.A.Richter, B.A.Brown

Nuclear structure studies in the 0s1d shell applied to astrophysical rp-process calculations

NUCLEAR STRUCTURE ³⁰S; calculated levels, J, π using isobaric mass multiplet equation and T=1 analogue states binding energy.

NUCLEAR REACTIONS ²⁹P, ³⁵Ar(p, γ), E≈10 keV-1 MeV; calculated rp reaction rate, γ decay T_1/2. ³⁶K(p, γ); calculated reaction rates using shell model with USDA and USDB interactions.

doi: 10.1088/1742-6596/381/1/012113
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2011RI03      Prog.Part.Nucl.Phys. 66, 283 (2011)

W.A.Richter, B.A.Brown, A.Signoracci, M.Wiescher

Shell-model studies of the rp reaction ²⁵Al(p, γ)²⁶Si

NUCLEAR REACTIONS ²⁵Al(p, γ)²⁶Si, E<150 keV; calculated reaction rates and uncertainties.

NUCLEAR STRUCTURE ²⁶Si; calculated energy levels, J, π, spectroscopic factors. USDA and USDB interaction.

doi: 10.1016/j.ppnp.2011.01.021
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2011RI06      Phys.Rev. C 83, 065803 (2011)

W.A.Richter, B.A.Brown, A.Signoracci, M.Wiescher

Properties of ²⁶Mg and ²⁶Si in the sd shell model and the determination of the ²⁵Al(p, γ)²⁶Si reaction rate

NUCLEAR REACTIONS ²⁵Al(p, γ)²⁶Si, E not given; calculated resonance-capture rate, Γ_g, Γ_p using sd-shell model with USD, USDA and USDB Hamiltonians. Comparison with experimental data. Astrophysical implications for novae and x-ray bursts.

NUCLEAR STRUCTURE ²⁶Si, ²⁶Mg; calculated level energies, resonance energies, J, π, Γ_g, Γ_p, spectroscopic factors using sd-shell model and isobaric-mass-multiplet equation (IMME). Comparison with experimental data.

doi: 10.1103/PhysRevC.83.065803
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2011RI09      Phys.Rev. C 84, 059802 (2011)

W.A.Richter, B.A.Brown, A.Signoracci, M.Wiescher

Reply to "Comment on 'Properties of ²⁶Mg and ²⁶Si in the sd shell model and the determination of the ²⁵Al(p, γ)²⁶Si reaction rate'"

NUCLEAR REACTIONS ²⁵Al(p, γ)²⁶Si; analyzed and revised reaction rates using updated level and resonance energy.

doi: 10.1103/PhysRevC.84.059802
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2010KA39      Nucl.Phys. A848, 110 (2010)

S.Karataglidis, K.R.Henninger, W.A.Richter, K.Amos

Proton scattering observables from Skyrme-Hartree-Fock densities

NUCLEAR REACTIONS ²⁸Si(p, p), E=65, 200 MeV; ³²S(p, p), E=29.6, 65 MeV; ⁴⁰Ar(p, p), E=65 MeV; ^40,42,44,48Ca(p, p), E=65 MeV; calculated analyzing powers; ³⁴S(p, p), E=29.8 MeV; ³⁶S(p, p), E=28 MeV; ³⁸S(p, p), E=39 MeV; ⁴⁰S(p, p), E=30 MeV; ³⁶Ar(p, p), E=33 MeV; ³⁸Ar(p, p), E=33, 65 MeV; ^42,44Ar(p, p), E=33 MeV; ^46,50,52,54Ca(p, p), E=65 MeV; calculated σ(θ). Shell and Skyrme-Hartree-Fock models. Comparison with data.

doi: 10.1016/j.nuclphysa.2010.08.018
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2010PE15      Phys.Rev. C 82, 064305 (2010)

S.M.Perez, W.A.Richter, B.A.Brown, M.Horoi

Magnetic moments of T=3/2 mirror pairs

NUCLEAR MOMENTS ⁴³V, ⁴³Ca, ⁴⁵Sc, ⁴⁵Cr, ⁴⁷Mn, ⁴⁷Ti, ⁴⁹Fe, ⁴⁹V, ⁵¹Co, ⁵¹Cr, ⁵³Ni, ⁵³Mn; analyzed magnetic moments, γ_p and γ_n values of T=3/2 proton-rich nuclei in fp shell by using experimental values for their neutron-rich mirror nuclei. ¹⁹Na, ¹⁹O, ²¹F, ²¹Mg, ²³Al, ²³Ne, ²⁵Na, ²⁵Si, ²⁷P, ²⁷Mg, ²⁹Al, ²⁹S, ³¹Cl, ³¹Si, ³³P, ³³Ar, ³⁵K, ³⁵S, ³⁷Cl, ³⁷Ca; analyzed g_p and γ_n values of T=3/2 mirror nuclei in sd shell. Shell model calculations.

doi: 10.1103/PhysRevC.82.064305
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2009RI10      Phys.Rev. C 80, 034301 (2009)

W.A.Richter, B.A.Brown

²⁶Mg observables for the USDA and USDB Hamiltonians

NUCLEAR STRUCTURE ²⁶Mg; calculated levels, J, π, half-lives, B(M1), B(E2), B(E4), electron scattering form factors using universal sd-shell interactions A and B (USDA, USDB). Comparison with experimental data.

RADIOACTIVITY ²⁶Na(β^-); calculated B(GT) using the USDA, USDB, and USD interactions and compared with experimental values.

doi: 10.1103/PhysRevC.80.034301
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2008KI13      Nucl.Phys. A807, 119 (2008)

Y.J.Kim, K.Amos, S.Karataglidis, W.A.Richter

Microscopic model analyses of proton scattering from ¹²C, ²⁰Ne, ²⁴Mg, ²⁸Si and ⁴⁰Ca

NUCLEAR REACTIONS ¹²C, ²⁰Ne, ²⁴Mg, ²⁸Si, ⁴⁰Ca(polarized p, p), (polarized p, p'), E=35-250 MeV; analyzed elastic and inelastic σ, analyzing powers using a g-folding approach and DWBA.

doi: 10.1016/j.nuclphysa.2008.04.006
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2008PE13      Phys.Rev. C 77, 064311 (2008)

S.M.Perez, W.A.Richter, B.A.Brown, M.Horoi

Correlations between magnetic moments and β decays of mirror nuclei

NUCLEAR STRUCTURE ¹¹B, ^11,13C, ^13,15N, ^15,17O, ^17,19F, ^19,21Ne, ^21,23Na, ^23,25Mg, ^25,27Al, ^27,29Si, ^29,31P, ^31,33S, ^33,35Cl, ^35,37Ar, ^37,39K, ^39,41Ca, ^41,43Sc, ^43,45Ti, ^45,47V, ^47,49Cr, ^49,51Mn, ^51,53Fe, ^53,55Co, ^55,57Ni, ⁵⁷Cu; calculated magnetic moments, β-decay half-lives, gyromagnetic ratios.

doi: 10.1103/PhysRevC.77.064311
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2008RI07      Phys.Rev. C 78, 064302 (2008)

W.A.Richter, S.Mkhize, B.A.Brown

sd-shell observables for the USDA and USDB Hamiltonians

NUCLEAR STRUCTURE ^23,25Ne, ^30,31Na, ^27,29,31Mg; calculated magnetic moments. USDA and USDB Shell Model Calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.78.064302
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2006AM01      Phys.Rev.Lett. 96, 032503 (2006)

K.Amos, W.A.Richter, S.Karataglidis, B.A.Brown

Proton Reaction Cross Sections as Measures of the Spatial Distributions of Neutrons in Exotic Nuclei

NUCLEAR STRUCTURE A=28-58; calculated proton and neutron densities, radii; deduced optical model parameters, proton scattering σ.

NUCLEAR REACTIONS ⁴⁰Ar(p, p), E=65 MeV; ⁵⁸Ni(p, p), E=200 MeV; calculated σ(θ), Ay(θ). Comparison with data.

doi: 10.1103/PhysRevLett.96.032503
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2006BR18      Phys.Rev. C 74, 034315 (2006)

B.A.Brown, W.A.Richter

New "USD" Hamiltonians for the sd shell

NUCLEAR STRUCTURE ²⁶Al, ²⁶Mg, ²⁶Na, ²⁶Ne, ²⁶F, ²⁶O; calculated levels, J, π, β-decay properties. Comparison with data.

doi: 10.1103/PhysRevC.74.034315
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2006ZE01      Phys.Rev. C 74, 024309 (2006)

R.G.T.Zegers, H.Akimune, S.M.Austin, D.Bazin, A.M.van den Berg, G.P.A.Berg, B.A.Brown, J.Brown, A.L.Cole, I.Daito, Y.Fujita, M.Fujiwara, S.Gales, M.N.Harakeh, H.Hashimoto, R.Hayami, G.W.Hitt, M.E.Howard, M.Itoh, J.Janecke, T.Kawabata, K.Kawase, M.Kinoshita, T.Nakamura, K.Nakanishi, S.Nakayama, S.Okumura, W.A.Richter, D.A.Roberts, B.M.Sherrill, Y.Shimbara, M.Steiner, M.Uchida, H.Ueno, T.Yamagata, M.Yosoi

The (t, ³He) and (³He, t) reactions as probes of Gamow-Teller strength

NUCLEAR REACTIONS ²⁶Mg(t, ³He), E=115 MeV/nucleon; ²⁶Mg(³He, t), E=140 MeV/nucleon; measured σ(E, θ); deduced Gamow-Teller transition strengths. Comparison with model predictions.

doi: 10.1103/PhysRevC.74.024309
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE1997. Data from this article have been entered in the XUNDL database. For more information, click here.

2005BL15      Phys.Rev.Lett. 94, 232501 (2005); Erratum Phys.Rev.Lett. 94, 249901 (2005)

B.Blank, A.Bey, G.Canchel, C.Dossat, A.Fleury, J.Giovinazzo, I.Matea, N.Adimi, F.De Oliveira, I.Stefan, G.Georgiev, S.Grevy, J.C.Thomas, C.Borcea, D.Cortina, M.Caamano, M.Stanoiu, F.Aksouh, B.A.Brown, F.C.Barker, W.A.Richter

First Observation of ⁵⁴Zn and its Decay by Two-Proton Emission

NUCLEAR REACTIONS Ni(⁵⁸Ni, X), E=74.5 MeV/nucleon; measured fragment yields; deduced evidence for ⁵⁴Zn.

RADIOACTIVITY ⁵⁴Zn(2p) [from Ni(⁵⁸Ni, X)]; measured Ep, T_1/2, two-proton decay branching ratio. Comparison with model predictions.

doi: 10.1103/PhysRevLett.94.232501
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2005BR40      Phys.Rev. C 72, 057301 (2005)

B.A.Brown, W.A.Richter

Magic numbers in the neutron-rich oxygen isotopes

NUCLEAR STRUCTURE ^{17,18,19,20,21,22,23,24,25,26,27,28}O; calculated, analyzed level energies, shell features.

doi: 10.1103/PhysRevC.72.057301
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2003BR19      Nucl.Phys. A719, 177c (2003)

B.A.Brown, R.Clement, H.Schatz, J.Giansiracusa, W.A.Richter, M.Hjorth-Jensen, K.-L.Kratz, B.Pfeiffer, W.B.Walters

Nuclear structure theory for the astrophysical rp-process and r-process

NUCLEAR STRUCTURE A=40-80; calculated displacement energies. Z=29-38; calculated one- and two-proton separation energies. ¹³⁰Cd, ¹²⁹Ag, ¹²⁸Pd, ¹²⁷Rh, ¹²⁶Ru, ¹²⁵Tc, ¹²⁴Mo, ¹²³Nb, ¹²²Zr; calculated level-mixing features, β-decay T_1/2.

doi: 10.1016/S0375-9474(03)00914-X
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2003CL07      Nucl.Phys. A718, 617c (2003)

R.R.C.Clement, W.Benenson, B.A.Brown, W.A.Richter, H.Schatz, B.M.Sherrill, A.Volya

Sensitivities of rp-process calculations to nuclear mass uncertainties

doi: 10.1016/S0375-9474(03)00903-5
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2003RI02      Phys.Rev. C 67, 034317 (2003)

W.A.Richter, B.A.Brown

Nuclear charge densities with the Skyrme Hartree-Fock method

NUCLEAR STRUCTURE ¹²C, ¹⁵N, ¹⁶O, ²⁷Al, ^28,29,30Si, ³¹P, ^32,34,36S, ⁴⁰Ar, ^40,48Ca, ^48,50Ti, ^50,52,54Cr, ^54,56,58Fe, ⁵⁹Co, ^58,60,62,64Ni, ^63,65Cu, ⁸⁸Sr, ⁹⁰Zr, ⁹²Mo, ²⁰⁴Hg, ²⁰⁸Pb; calculated charge density distributions, radii. Skyrme-Hartree-Fock approach, comparisons with electron scattering data.

doi: 10.1103/PhysRevC.67.034317
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2002BR01      Phys.Rev. C65, 014612 (2002)

B.A.Brown, S.Typel, W.A.Richter

Interaction Cross Sections for Light Neutron-Rich Nuclei

NUCLEAR REACTIONS ¹²C(α, X), (⁶He, X), (⁸He, X), (⁶Li, X), (⁷Li, X), (⁸Li, X), (⁹Li, X), (¹¹Li, X), (⁷Be, X), (⁸Be, X), (⁹Be, X), (¹⁰Be, X), (¹¹Be, X), (¹²Be, X), (¹⁴Be, X), (⁸B, X), (¹⁰B, X), (¹¹B, X), (¹²B, X), (¹³B, X), (¹⁴B, X), (¹⁵B, X), (¹⁷B, X), (¹⁹B, X), (⁹C, X), (¹⁰C, X), (¹¹C, X), (¹²C, X), (¹³C, X), (¹⁴C, X), (¹⁵C, X), (¹⁶C, X), (¹⁷C, X), (¹⁸C, X), (¹⁹C, X), (²⁰C, X), (¹²N, X), (¹³N, X), (¹⁴N, X), (¹⁵N, X), (¹⁶N, X), (¹⁷N, X), (¹⁸N, X), (¹⁹N, X), (²⁰N, X), (²¹N, X), (²²N, X), (²³N, X), (¹³O, X), (¹⁴O, X), (¹⁵O, X), (¹⁶O, X), (¹⁷O, X), (¹⁸O, X), (¹⁹O, X), (²⁰O, X), (²¹O, X), (²²O, X), (²³O, X), (²⁴O, X), (¹⁷F, X), (¹⁸F, X), (¹⁹F, X), (²⁰F, X), (²¹F, X), (²²F, X), (²³F, X), (²⁴F, X), (²⁵F, X), (²⁶F, X), (¹⁷Ne, X), (¹⁸Ne, X), (¹⁹Ne, X), (²⁰Ne, X), (²¹Ne, X), (²²Ne, X), (²³Ne, X), (²⁴Ne, X), (²⁵Ne, X), (²⁶Ne, X), (²⁷Ne, X), (²⁸Ne, X), (²⁹Ne, X), (²⁰Na, X), (²¹Na, X), (²²Na, X), (²³Na, X), (²⁴Na, X), (²⁵Na, X), (²⁶Na, X), (²⁷Na, X), (²⁸Na, X), (²⁹Na, X), (³⁰Na, X), (³¹Na, X), (³²Na, X), (²⁰Mg, X), (²¹Mg, X), (²²Mg, X), (²³Mg, X), (²⁴Mg, X), (²⁵Mg, X), (²⁶Mg, X), (²⁷Mg, X), (²⁸Mg, X), (²⁹Mg, X), (³⁰Mg, X), (³¹Mg, X), (³²Mg, X), E not given; calculated interaction σ. Glauber model, comparison with data.

doi: 10.1103/PhysRevC.65.014612
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2002BR15      Phys.Rev. C65, 045802 (2002)

B.A.Brown, R.R.C.Clement, H.Schatz, A.Volya, W.A.Richter

Proton Drip-Line Calculations and the rp Process

NUCLEAR STRUCTURE A=41-75; calculated one- and two-proton separation energies for proton-rich isotopes. Implications for astrophysical rp process discussed.

doi: 10.1103/PhysRevC.65.045802
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2000BR29      Phys.Lett. 483B, 49 (2000)

B.A.Brown, W.A.Richter, R.Lindsay

Displacement Energies with the Skyrme Hartree-Fock Method

NUCLEAR STRUCTURE A=7-60; calculated binding and Coulomb displacement energies. Comparison with data, discussion of Nolen-Schiffer anomaly.

doi: 10.1016/S0370-2693(00)00589-X
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2000CO29      Phys.Rev. C62, 064605 (2000)

A.A.Cowley, G.F.Steyn, S.S.Dimitrova, P.E.Hodgson, G.J.Arendse, S.V.Fortsch, G.C.Hillhouse, J.J.Lawrie, R.Neveling, W.A.Richter, J.A.Stander, S.M.Wyngaardt

Multistep Direct Mechanism in the (p(pol), ³He) Inclusive Reaction on ⁵⁹Co and ⁹³Nb at an Incident Energy of 100 MeV

NUCLEAR REACTIONS ⁵⁹Co, ⁹³Nb(polarized p, ³He), E=100 MeV; measured σ(E, θ), Ay(θ); deduced one-step, multistep process contributions, other reaction mechanism features. Comparison with model predictions.

doi: 10.1103/PhysRevC.62.064605
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0443.

1999CH50      Nucl.Phys. (Supplement) A654, 1051c (1999)

M.B.Chadwick, D.T.L.Jones, G.J.Arendse, A.A.Cowley, W.A.Richter, J.J.Lawrie, R.T.Newman, J.V.Pilcher, F.D.Smit, G.F.Steyn, J.W.Koen, J.A.Stander

Nuclear Interaction Cross Sections for Proton Radiotherapy

NUCLEAR REACTIONS ¹²C(p, pX), (p, dX), E=150 MeV; ¹⁶O(p, αX), (p, tX), E=200 MeV; measured σ(E, θ). ¹²C, ¹⁶O(p, pX), E=200 MeV; calculated proton spectra, σ(θ). ¹⁶O(p, X)⁷Li/⁷Be/⁹Be/¹⁰Be/¹⁰B/¹¹B/¹⁰C/¹¹C/¹⁴C/¹³N/¹⁴O/¹⁵O, E ≈ 5-250 MeV; calculated production σ.

doi: 10.1016/S0375-9474(00)88598-X
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1998BR30      Phys.Rev. C58, 2099 (1998)

B.A.Brown, W.A.Richter

Shell-Model Plus Hartree-Fock Calculations for the Neutron-Rich Ca Isotopes

NUCLEAR STRUCTURE ^{47,48,49,50,51,52,53,54,55,56,57,58,59,60}Ca; calculated binding energies, levels, J, π. ⁴⁸Ca calculated electron scattering form factors. Shell model plus Hartree-Fock approach.

doi: 10.1103/PhysRevC.58.2099
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1997CO05      Phys.Rev. C55, 1843 (1997)

A.A.Cowley, G.J.Arendse, G.F.Steyn, J.A.Stander, W.A.Richter, S.S.Dimitrova, P.Demetriou, P.E.Hodgson

Inclusive (p, ³He) Reactions on ⁵⁹Co and ¹⁹⁷Au at Incident Energies of 120, 160, and 200 MeV

NUCLEAR REACTIONS ⁵⁹Co, ¹⁹⁷Au(p, ³He), E=120, 160, 200 MeV; measured σ(θ) vs E; deduced multi-step mechanisms role. Statistical multi-step direct reaction theory.

doi: 10.1103/PhysRevC.55.1843
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO0507.

1996BR15      Phys.Rev. C54, 673 (1996)

B.A.Brown, W.A.Richter

Neutron Halos in the Na Isotopes

NUCLEAR STRUCTURE ^{20,21,22,23,24,25,26,27,28,29,30,31,32}Na; calculated nucleon rms radii, higher mass isotopes included out to drip lines; deduced intruder states role, neutron drip line prediction related features. Spherical Hartree-Fock model, different density-dependent Skyrme interactions.

doi: 10.1103/PhysRevC.54.673
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1996CO12      Phys.Rev. C54, 778 (1996)

A.A.Cowley, G.J.Arendse, J.W.Koen, W.A.Richter, J.A.Stander, G.F.Steyn, P.Demetriou, P.E.Hodgson, Y.Watanabe

Inclusive (p, α) Reactions on ²⁷Al, ⁵⁹Co, and ¹⁹⁷Au at Incident Energies of 120, 160, and 200 MeV

NUCLEAR REACTIONS ²⁷Al, ⁵⁹Co, ¹⁹⁷Au(p, α), E=120, 160, 200 MeV; measured σ(Eα, θ); deduced higher-step contributions role. Multi-step DWBA analysis.

doi: 10.1103/PhysRevC.54.778
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO0508.

1996NE05      Phys.Rev. C54, 1773 (1996); Erratum Phys.Rev. C55, 1605 (1997)

R.T.Newman, R.W.Fearick, S.M.Perez, D.G.Aschman, K.Bharuth-Ram, W.A.Richter, F.D.Smit, V.M.Tshivhase, T.S.Volkwyn

0f_7/2 Proton Transfer on ⁵⁵Mn

NUCLEAR REACTIONS ⁵⁵Mn(d, ³He), (d, d), E=46 MeV; measured σ(θ); deduced opptical model parameters. ⁵⁴Cr deduced levels, J, spectroscopic factors. ⁵⁵Mn(α, t), E not given; analyzed data. ⁵⁶Fe levels deduced spins, spectroscopic factors. Spectroscopic sum rules analysis.

doi: 10.1103/PhysRevC.54.1773
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1996RI11      Phys.Rev. C54, 1756 (1996)

W.A.Richter, S.W.Steyn, A.A.Cowley, J.A.Stander, J.W.Koen, R.Lindsay, G.C.Hillhouse, R.E.Julies, J.J.Lawrie, J.V.Pilcher, P.E.Hodgson

Inclusive (p, p') Reactions on Nuclei in the Mass Range 115 to 181 at Incident Energies from 120 to 200 MeV

NUCLEAR REACTIONS ¹¹⁵In, ¹⁶⁷Er, ¹⁷³Yb, ¹⁸¹Ta(p, p'X), E=120, 150, 175, 200 MeV; ¹⁴¹Pr(p, p'X), E=120, 200 MeV; measured inclusive σ(E, θ); deduced reaction mechanism. Statistical multistep direct theory analysis.

doi: 10.1103/PhysRevC.54.1756
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO0513.

1995CO25      Phys.Lett. 359B, 300 (1995)

A.A.Cowley, G.J.Arendse, J.A.Stander, W.A.Richter

Distortion in Proton-Knockout Reactions

NUCLEAR REACTIONS ²⁰⁸Pb(p, 2p), E=204 MeV; measured yield vs total energy, σ(θ, Ep). ²⁰⁸Pb deduced proton knock-out spectroscopic factors.

doi: 10.1016/0370-2693(95)01028-O
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO0315.

1995RI05      Nucl.Phys. A586, 445 (1995); Erratum Nucl.Phys. A596, 716 (1996)

W.A.Richter, M.G.Van der Merwe, B.Brown

Shell-Model Calculations for Neutron-Rich Nuclei in the 0f1p Shell

NUCLEAR STRUCTURE ^{51,52,53,54,55,56,57,58,59,60}Ca, ^{52,53,54,55,56,57,58,59,60,61}Sc, ^{54,55,56,57,58,59,60,61,62}Ti, ^{59,60,61,62,63}V, ^{58,60,61,62,63,64}Cr, ^62,63,64,65Mn, ^63,64,65,66Fe; calculated binding energies, mass defects. ^51,50,52Ca, ^52,53Ti, ^51,52Sc; calculated levels. Shell model, empirical effective interaction.

doi: 10.1016/0375-9474(94)00802-T
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1994RI01      Phys.Rev. C49, 1001 (1994)

W.A.Richter, A.A.Cowley, G.C.Hillhouse, J.A.Stander, J.W.Koen, S.W.Steyn, R.Lindsay, R.E.Julies, J.J.Lawrie, J.V.Pilcher, P.E.Hodgson

Preequilibrium (p, p') Measurements and Calculations for ⁹⁰Zr and Neighboring Nuclei for Incident Energies up to 200 MeV

NUCLEAR REACTIONS ⁸⁹Y, ⁹⁰Zr, ^92,94,96,98Mo(p, p'), E=120, 160, 200 MeV; measured inclusive σ(E, θ); deduced reaction mechanism. Statistical multi-step, direct theory analysis.

doi: 10.1103/PhysRevC.49.1001
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO0179.

1994RI08      Nucl.Phys. A577, 585 (1994)

W.A.Richter, M.G.Van der Merwe, R.E.Julies, B.A.Brown

Tests and Predictions of New Effective Interactions in the 0f1p Shell

NUCLEAR STRUCTURE ^42,44,45,43Sc, ^{41,42,43,44,45,46,47,48,49}Ca, ^44,45Ti; calculated nucleon transfer spectroscopic factors in some cases, B(λ). New effective interaction.

doi: 10.1016/0375-9474(94)90934-2
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1994VA26      Nucl.Phys. A579, 173 (1994)

M.G.van der Merwe, W.A.Richter, B.A.Brown

Effective Interactions for A = 41-66 Nuclei

NUCLEAR STRUCTURE ^49,52Ca, ⁵¹V, ⁵²Sc, ⁵²Ti, ⁵³Mn, ⁵⁶Fe; calculated levels. ^{41,42,43,44,45,47,49,51}Ca, ^{41,43,44,45,46,47,48,49,50,51,52}Sc, ^{45,46,47,48,49,50,51}Ti, ^{46,47,48,49,50,51,52,53}V, ^51,52,53,54Cr, ^{51,52,53,54,55}Mn, ^53,54,55,56Fe, ^55,56,57,58Co, ^{57,58,59,60,61,62,63,65}Ni, ^58,59,60Cu; calculated μ, electric quadrupole moments. Shell model, effective interactions.

doi: 10.1016/0375-9474(94)90800-1
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1993OL05      Z.Phys. A347, 99 (1993)

L.D.Olivier, W.A.Richter, J.A.Stander, J.W.Koen

Properties of Levels in ²²Ne

NUCLEAR REACTIONS ¹⁹F(α, pγ), E=12 MeV; measured γp-coin. ²²Ne deduced levels, T_1/2, J, π, δ, γ branching ratios, B(λ). Shell model comparison.

doi: 10.1007/BF01284676
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1992RI06      Phys.Rev. C46, 1030 (1992)

W.A.Richter, A.A.Cowley, R.Lindsay, J.J.Lawrie, S.V.Fortsch, J.V.Pilcher, R.Bonetti, P.E.Hodgson

Statistical Multistep Direct Calculations for (p, p') Continuum Spectra up to 200 MeV

NUCLEAR REACTIONS ¹⁰⁰Mo(p, p'), E=100-200 MeV; measured σ(θ, Ep'). ⁵⁸Ni, ¹⁹⁷Au(p, p'), E=100-200 MeV; analyzed σ(θ, Ep'). Statistical multi-step direct theory.

doi: 10.1103/PhysRevC.46.1030
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO0535.

1991CO03      Phys.Rev. C43, 678 (1991)

A.A.Cowley, A.van Kent, J.J.Lawrie, S.V.Fortsch, D.M.Whittal, J.V.Pilcher, F.D.Smit, W.A.Richter, R.Lindsay, I.J.van Heerden, R.Bonetti, P.E.Hodgson

Preequilibrium Proton Emission Induced by 80 and 120 MeV Protons Incident on ⁹⁰Zr

NUCLEAR REACTIONS ⁹⁰Zr(p, p'), E=80, 120 MeV; measured σ(Ep', θp'); deduced reaction mechanism, effective interaction strength. Phenomenological parametrization.

doi: 10.1103/PhysRevC.43.678
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1991RI04      Nucl.Phys. A523, 325 (1991)

W.A.Richter, M.G.Van Der Merwe, R.E.Julies, B.A.Brown

New Effective Interactions for the 0f1p Shell

NUCLEAR STRUCTURE ^{43,45,48,49,47,41}Ca, ^43,44,45Sc, ⁴⁵Ti; calculated levels, μ, quadrupole moment. Shell model, new effective interactions.

doi: 10.1016/0375-9474(91)90007-S
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1990ZH07      Phys.Rev. C42, 1120 (1990)

L.Zhao, B.A.Brown, W.A.Richter

Shell-Model Calculation for Two-Neutrino Double Beta Decay of ⁴⁸Ca

RADIOACTIVITY ⁴⁸Ca(2β); calculated decay T_1/2. ⁴⁸Ca, ⁴⁸Ti; calculated Gamow-Teller transition strength. Large basis shell model.

doi: 10.1103/PhysRevC.42.1120
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1988BR11      Ann.Phys.(New York) 182, 191 (1988)

B.A.Brown, W.A.Richter, R.E.Julies, B.H.Wildenthal

Semi-Empirical Effective Interactions for the 1s-0d Shell

NUCLEAR STRUCTURE A=17-39; analyzed binding energy data; deduced density dependent two-body potential parameters.

doi: 10.1016/0003-4916(88)90013-9
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1988ST06      Phys.Rev. C37, 2220 (1988)

J.Stevenson, B.A.Brown, Y.Chen, J.Clayton, E.Kashy, D.Mikolas, J.Nolen, M.Samuel, B.Sherrill, J.S.Winfield, Z.Q.Xie, R.E.Julies, W.A.Richter

Search for the Exotic Nucleus ¹⁰He

NUCLEAR REACTIONS Sn(¹⁸O, X), E=30 MeV/nucleon; measured fragment mass spectra; deduced ¹⁰He production upper limit.

NUCLEAR STRUCTURE ^{4,5,6,7,8,9,10}He; calculated binding energy. Shell model.

doi: 10.1103/PhysRevC.37.2220
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1987FR09      Z.Phys. A327, 469 (1987)

S.Froneman, W.J.Naude, W.A.Richter, J.A.Stander, J.W.Koen

Nuclear Levels in ⁴³Sc at Low Excitation Energies

NUCLEAR REACTIONS ⁴⁰Ca(α, p), (α, pγ), E=12 MeV; measured Eγ, Iγ, pγ-coin. ⁴³Sc deduced level energies, J, π, γ-branching ratios, mean T_1/2, δ. ΔE-E telescope, Ge(Li) detector. Shell model calculations.

1980BR21      Phys.Rev.Lett. 45, 1681 (1980)

B.A.Brown, W.A.Richter, N.S.Godwin

Nuclear-Structure Effects on Parity Nonconservation in Light Nuclei

NUCLEAR STRUCTURE ¹⁰B, ¹⁶O, ^18,19F, ^20,21Ne; calculated parity nonconserving matrix elements. Nucleon-nucleon parity nonconserving potentials, microscopic shell model.

doi: 10.1103/PhysRevLett.45.1681
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1980RI06      Z.Phys. A297, 343 (1980)

W.A.Richter, P.R.de Kock

Non-Normal Parity States in Mass 10-15 Nuclei

NUCLEAR STRUCTURE A=10-15; calculated unnatural parity levels, S, β-decay T_1/2, Γγ, B(E2), B(M1). Shell model, modified surface delta interaction.

doi: 10.1007/BF01422795
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1977RI08      Z.Phys. A282, 207 (1977)

W.A.Richter, P.R.de Kock

The Calculation of Log ft Values and Spectroscopic Factors for Nuclei In the Mass Range 10-15

RADIOACTIVITY ^{15,10,11,13,14}C, ^12,13B, ^12,13N, ^13,14,15O; calculated log ft, S.

doi: 10.1007/BF01408165
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