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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, mCl(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, Γp, Γγ, 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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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 Tz=-2 56Zn ground state, Tz=-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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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 T1/2. 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, Γg, Γp 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, Γg, Γp, 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, γp and γn 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 gp and γn 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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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, T1/2, 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 17,18,19,20,21,22,23,24,25,26,27,28O; 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 T1/2.

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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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 47,48,49,50,51,52,53,54,55,56,57,58,59,60Ca; 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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1996BR15      Phys.Rev. C54, 673 (1996)

B.A.Brown, W.A.Richter

Neutron Halos in the Na Isotopes

NUCLEAR STRUCTURE 20,21,22,23,24,25,26,27,28,29,30,31,32Na; 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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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

0f7/2 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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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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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 51,52,53,54,55,56,57,58,59,60Ca, 52,53,54,55,56,57,58,59,60,61Sc, 54,55,56,57,58,59,60,61,62Ti, 59,60,61,62,63V, 58,60,61,62,63,64Cr, 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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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, 41,42,43,44,45,46,47,48,49Ca, 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. 41,42,43,44,45,47,49,51Ca, 41,43,44,45,46,47,48,49,50,51,52Sc, 45,46,47,48,49,50,51Ti, 46,47,48,49,50,51,52,53V, 51,52,53,54Cr, 51,52,53,54,55Mn, 53,54,55,56Fe, 55,56,57,58Co, 57,58,59,60,61,62,63,65Ni, 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, T1/2, 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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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 43,45,48,49,47,41Ca, 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 T1/2. 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 4,5,6,7,8,9,10He; 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 T1/2, 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 T1/2, 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 15,10,11,13,14C, 12,13B, 12,13N, 13,14,15O; calculated log ft, S.

doi: 10.1007/BF01408165
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