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NSR database version of April 11, 2024.

Search: Author = W.E.Ormand

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2021SO05      Phys.Rev. C 103, 015802 (2021)

D.Soltesz, M.A.A.Mamun, A.V.Voinov, Z.Meisel, B.A.Brown, C.R.Brune, S.M.Grimes, H.Hadizadeh, M.Hornish, T.N.Massey, J.E.O'Donnell, W.E.Ormand

Determination of the 60Zn level density from neutron evaporation spectra

NUCLEAR REACTIONS 58Ni(3He, n), E=10 MeV; measured E(n), I(n) by time-of-flight method using NE213 liquid organic scintillators at Edwards Accelerator Laboratory; deduced differential σ(En) and for σ(Ep), the latter from experimental data in 2007Vo08, and compared to theoretical calculations using TALYS-V1.8. 60Zn; deduced level density for 60Zn as function of excitation energy up to 10 MeV, and compared to global theoretical models, including phenomenological, microscopic, and shell-model based calculations. Relevance to confirmation of Hauser-Feshbach formalism for 59Cu(p, γ)60Zn reaction rate at x-ray burst temperatures.

doi: 10.1103/PhysRevC.103.015802
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2593.

2020OR04      Phys.Rev. C 102, 014315 (2020)

W.E.Ormand, B.A.Brown

Microscopic calculations of nuclear level densities with the Lanczos method

NUCLEAR STRUCTURE 47,48Cr, 72,73Kr, 57Fe, 74,76Ge; calculated Hamiltonian moments, level density, and level spacing, and comparison with experimental data for 57Fe, 74,76Ge, and with other model predictions. 55,57,58,59Fe; calculated level spacings (D1) for L=1 neutron resonances and compared with experimental data. 73,74,75,77Ge; calculated level spacings (D0) for L=0 neutron resonances and compared with experimental data. 57Fe, 74,76Ge; calculated angular momenta probabilities. 74,76Ge; calculated spin cutoff parameter for positive and negative parity states. New method for calculating the density of states in nuclei using an extrapolated form of the tridiagonal matrix obtained from the Lanczos method (ELM).

doi: 10.1103/PhysRevC.102.014315
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2019KR15      Eur.Phys.J. A 55, 225 (2019)

M.K.G.Kruse, W.E.Ormand, C.W.Johnson

No-core shell model calculations of the photonuclear cross section of 10B

doi: 10.1140/epja/i2019-12905-1
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2017OR02      Phys.Rev. C 96, 024323 (2017)

W.E.Ormand, B.A.Brown, M.Hjorth-Jensen

Realistic calculations for c coefficients of the isobaric mass multiplet equation in 1p0f shell nuclei

NUCLEAR STRUCTURE A=42, 46, 50, 54; calculated c coefficients of the isobaric mass multiplet equation (IMME) for nuclei in A=42 to 54 based on input from three realistic nucleon-nucleon interactions (CD-Bonn, AV18 and N3LO); deduced dependence on the short-range charge-symmetry-breaking (CSB) part of the strong interaction, disagreement in the CSB part between the commonly used CD-Bonn, chiral effective field theory at next-to-next-to-next-to-leading-order, and Argonne V18 nucleon-nucleon interactions, and CSB contribution to the c coefficient from all three interactions too large as compared to the experimental data.

doi: 10.1103/PhysRevC.96.024323
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2013JU01      Phys.Rev. C 87, 054312 (2013)

E.D.Jurgenson, P.Maris, R.J.Furnstahl, P.Navratil, W.E.Ormand, J.P.Vary

Structure of p-shell nuclei using three-nucleon interactions evolved with the similarity renormalization group

NUCLEAR STRUCTURE 3H, 4He, 7Li, 8Be, 10B, 12C; calculated ground-state and low-lying levels, J, π. 7Li, 7Be, 10B; calculated magnetic dipole moments of ground states and low-lying states. No-core full configuration (NCFC) and similarity renormalization group (SRG) ab initio calculations for p-shell nuclei. Assessment of convergence properties, extrapolation techniques, and dependence of energies, including four-body contributions. Comparison with experimental data.

doi: 10.1103/PhysRevC.87.054312
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2013KR03      Phys.Rev. C 87, 044301 (2013)

M.K.G.Kruse, E.D.Jurgenson, P.Navratil, B.R.Barrett, W.E.Ormand

Extrapolation uncertainties in the importance-truncated no-core shell model

NUCLEAR STRUCTURE 6Li; calculated distribution of ground-state energies, and other parameters. Importance-truncated no-core shell model (IT-NCSM), and NCSM calculations.

doi: 10.1103/PhysRevC.87.044301
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2012VO01      Phys.Rev. C 85, 024608 (2012)

R.Vogt, J.Randrup, D.A.Brown, M.A.Descalle, W.E.Ormand

Event-by-event evaluation of the prompt fission neutron spectrum from 239Pu(n, f)

NUCLEAR REACTIONS 239Pu(n, F), E<20 MeV; analyzed chance fission probability, probability for pre-equilibrium neutron emission, fragment mass yields, total and average fragment kinetic energies, neutron multiplicity, prompt neutron spectra, neutron-neutron correlation coefficient contour plots. Event-by-event fission model FREYA with multichance fission and pre-equilibrium neutron emission. Comparison with ENDF-B/VII.0 evaluation.

doi: 10.1103/PhysRevC.85.024608
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2011MA35      Phys.Rev.Lett. 106, 202502 (2011)

P.Maris, J.P.Vary, P.Navratil, W.E.Ormand, H.Nam, D.J.Dean

Origin of the Anomalous Long Lifetime of 14C

NUCLEAR STRUCTURE 14C, 14N; calculated rms radii, quadrupole moment, dipole moment, B(M1), β-decay matrix elements. deduced long lifetime for 14C. Ab initio no-core shell model calculations.

doi: 10.1103/PhysRevLett.106.202502
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2008OR01      Eur.Phys.J. Special Topics 156, 13 (2008)


Microscopic approaches to nuclear structure: Configuration interaction

doi: 10.1140\epjst/e2008-00607-1
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2007CH40      Phys.Rev. C 75, 054305 (2007); Publisher's note Phys. Rev. C 75, 059904 (2007)

C.J.Chiara, M.Devlin, E.Ideguchi, D.R.LaFosse, F.Lerma, W.Reviol, S.K.Ryu, D.G.Sarantites, O.L.Pechenaya, C.Baktash, A.Galindo-Uribarri, M.P.Carpenter, R.V.F.Janssens, T.Lauritsen, C.J.Lister, P.Reiter, D.Seweryniak, P.Fallon, A.Gorgen, A.O.Macchiavelli, D.Rudolph, G.Stoitcheva, W.E.Ormand

Probing sd-fp cross-shell interactions via terminating configurations in 42, 43Sc

NUCLEAR REACTIONS 28Si(20Ne, X)42Sc, 28Si(20Ne, X)43Sc, E=84 MeV; 24Mg(24Mg, X)42,43Sc, E=94 MeV; measured Eγ, Iγ, γγ-, (charged-particle)γ- coinc, angular distributions using the Gammasphere. Deduced level energies, J, π, high-spin and high-energy extension of level scheme.

doi: 10.1103/PhysRevC.75.054305
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Data from this article have been entered in the XUNDL database. For more information, click here.

2007NA16      Phys.Rev.Lett. 99, 042501 (2007)

P.Navratil, V.G.Gueorguiev, J.P.Vary, W.E.Ormand, A.Nogga

Structure of A=10-13 Nuclei with Two- Plus Three-Nucleon Interactions from Chiral Effective Field Theory

NUCLEAR STRUCTURE 4He, 6Li, 10,11B, 12,13C; calculated level energies, B(E2), B(M1), B(GT) using effective field theory.

doi: 10.1103/PhysRevLett.99.042501
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2007ZG01      Acta Phys.Pol. B38, 1179 (2007)

E.F.Zganjar, T.Achtzehn, D.Albers, C.Andreoiu, A.N.Andreyev, R.A.E.Austin, G.C.Ball, J.A.Behr, G.C.Biosvert, P.Bricault, S.Bishop, R.S.Chakrawarthy, R.Churchman, D.Cross, E.Cunningham, J.M.D'Auria, M.Dombsky, P.Finlay, P.E.Garrett, G.F.Grinyer, G.Hackman, V.Hanemaayer, J.C.Hardy, D.F.Hodgson, B.Hyland, V.Iacob, P.Klages, K.A.Koopmans, W.D.Kulp, J.Lassen, J.P.Lavoie, J.R.Leslie, T.Linder, J.A.Macdonald, H.-B.Mak, D.Melconian, A.C.Morton, W.E.Ormand, C.J.Osborne, C.J.Pearson, M.R.Pearson, A.A.Phillips, A.Piechaczek, J.Ressler, F.Sarazin, G.Savard, M.A.Schumaker, H.C.Scraggs, C.E.Svensson, J.J.Valiente-Dobon, I.S.Towner, J.C.Waddington, P.M.Walker, K.Wendt, J.L.Wood

Superallowed Beta Decay Studies at TRIUMF - Nuclear Structure and Fundamental Symmetries

2005FO01      Phys.Rev. C 71, 044312 (2005)

C.Forssen, P.Navratil, W.E.Ormand, E.Caurier

Large basis ab initio shell model investigation of 9Be and 11Be

NUCLEAR STRUCTURE 9,11Be; calculated levels, J, π, configurations, radii, B(E1), B(E2), B(M1). 11B, 13C; calculated levels, J, π. No-core shell model, realistic NN interactions, comparisons with data.

doi: 10.1103/PhysRevC.71.044312
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2005GR07      Phys.Rev. C 71, 044309 (2005)

G.F.Grinyer, C.E.Svensson, C.Andreoiu, A.N.Andreyev, R.A.E.Austin, G.C.Ball, R.S.Chakrawarthy, P.Finlay, P.E.Garrett, G.Hackman, J.C.Hardy, B.Hyland, V.E.Iacob, K.A.Koopmans, W.D.Kulp, J.R.Leslie, J.A.Macdonald, A.C.Morton, W.E.Ormand, C.J.Osborne, C.J.Pearson, A.A.Phillips, F.Sarazin, M.A.Schumaker, H.C.Scraggs, J.Schwarzenberg, M.B.Smith, J.J.Valiente-Dobon, J.C.Waddington, J.L.Wood, E.F.Zganjar

High precision measurements of 26Na β- decay

RADIOACTIVITY 26Na(β-) [from Si, Ta(p, X)]; measured Eγ, Iγ, T1/2; deduced log ft. 26Mg deduced levels, J, π, β-feeding intensities.

doi: 10.1103/PhysRevC.71.044309
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Data from this article have been entered in the XUNDL database. For more information, click here.

2005NA41      Eur.Phys.J. A 25, Supplement 1, 481 (2005)

P.Navratil, W.E.Ormand, C.Forssen, E.Caurier

Ab initio no-core shell model calculations using realistic two- and three-body interactions

NUCLEAR STRUCTURE 4He, 11Be, 10B, 13C; calculated ground and excited states energies. No-core shell model.

doi: 10.1140/epjad/i2005-06-145-6
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2005OR01      Int.J.Mod.Phys. E14, 67 (2005)


Nuclear physics with statistics

NUCLEAR STRUCTURE 22Na, 24Mg, 34Cl, 44Ti; calculated binding energies. 22Na, 24Mg; calculated level densities. Shell model, Lanczos diagonalization procedure.

doi: 10.1142/S0218301305002783
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2005VA32      Eur.Phys.J. A 25, Supplement 1, 475 (2005)

J.P.Vary, O.V.Atramentov, B.R.Barrett, M.Hasan, A.C.Hayes, R.Lloyd, A.I.Mazur, P.Navratil, A.G.Negoita, A.Nogga, W.E.Ormand, S.Popescu, B.Shehadeh, A.M.Shirokov, J.R.Spence, I.Stetcu, S.Stoica, T.A.Weber, S.A.Zaytsev

Ab initio No-Core Shell Model -- Recent results and future prospects

NUCLEAR STRUCTURE 4He; calculated radius. 6Li, 16O, 48Ar, 48K, 48Ca, 48Sc, 48Ti, 48V, 48Cr, 48Mn; calculated ground-state energies. 16O, 47Ca; calculated excited states energies. No-core shell model.

doi: 10.1140/epjad/i2005-06-214-x
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2004BB09      Nucl.Phys. A746, 579c (2004)

B.R.Barrett, P.Navratil, A.Nogga, W.E.Ormand, J.P.Vary

No-core shell-model calculations in light nuclei with three-nucleon forces

NUCLEAR STRUCTURE 6,7Li, 10B; calculated levels, J, π, three-nucleon force effects. No-core shell model.

doi: 10.1016/j.nuclphysa.2004.09.137
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2004VA29      Nucl.Phys. A746, 123c (2004)

J.P.Vary, B.R.Barrett, R.Lloyd, P.Navratil, A.Nogga, W.E.Ormand

Shell model in a first principles approach

NUCLEAR STRUCTURE 12C, 16O; calculated levels, J, π. No-core shell model, comparison with data.

doi: 10.1016/j.nuclphysa.2004.09.146
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2003KU02      Phys.Rev.Lett. 90, 042501 (2003)

D.Kusnezov, W.E.Ormand

Giant-Dipole Resonance and the Deformation of Hot, Rotating Nuclei

NUCLEAR STRUCTURE 44Ti, 90Zr, 120Sn, 168Er, 208Pb; calculated deformation vs temperature and angular momentum, correlation between GDR width and quadrupole deformation.

doi: 10.1103/PhysRevLett.90.042501
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2003NA21      Phys.Rev. C 68, 034305 (2003)

P.Navratil, W.E.Ormand

Ab initio shell model with a genuine three-nucleon force for the p-shell nuclei

NUCLEAR STRUCTURE 6He, 6,7Li, 7,8,10Be, 10,11,12B, 10,11,12,13C, 12N; calculated levels, J, π, effects of three-nucleon interaction. No-core shell model.

doi: 10.1103/PhysRevC.68.034305
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2002BA15      Acta Phys.Pol. B33, 297 (2002)

B.R.Barrett, P.Navratil, W.E.Ormand, J.P.Vary

Ab initio Large-Basis No-Core Shell Model and Its Application to Light Nuclei

NUCLEAR STRUCTURE 3H, 3,4He; calculated ground-state energies. 6Li, 6He, 12C; calculated levels, J, π. No-core shell model, several potentials compared, comparisons with data.

2002BE08      Phys.Rev. C65, 021601 (2002)

L.A.Bernstein, J.A.Becker, P.E.Garrett, W.Younes, D.P.McNabb, D.E.Archer, C.A.McGrath, H.Chen, W.E.Ormand, M.A.Stoyer, R.O.Nelson, M.B.Chadwick, G.D.Johns, W.S.Wilburn, M.Devlin, D.M.Drake, P.G.Young

239Pu(n, 2n)238Pu Cross Section Deduced using a Combination of Experiment and Theory

NUCLEAR REACTIONS 239Pu(n, 2n), E < 20 MeV; measured Eγ, Iγ, partial γ-ray σ; deduced σ, possible nuclear structure effects. Comparisons with model predictions. Geanie array.

doi: 10.1103/PhysRevC.65.021601
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset13787.

2002CA43      Phys.Rev. C66, 024314 (2002)

E.Caurier, P.Navratil, W.E.Ormand, J.P.Vary

Ab initio shell model for A=10 nuclei

NUCLEAR STRUCTURE 10Li, 10Be, 10B, 10C; calculated ground and excited states energies, J, π, transition strengths. No-core shell model.

doi: 10.1103/PhysRevC.66.024314
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2002GU05      Phys.Rev. C65, 024314 (2002)

V.G.Gueorguiev, W.E.Ormand, C.W.Johnson, J.P.Draayer

Mixed-Mode Shell-Model Theory for Nuclear Structure Studies

NUCLEAR STRUCTURE 24Mg; calculated binding energy, level energies. Mixed-mode shell model approach.

doi: 10.1103/PhysRevC.65.024314
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2002NA08      Phys.Rev.Lett. 88, 152502 (2002)

P.Navratil, W.E.Ormand

Ab Initio Shell Model Calculations with Three-Body Effective Interactions for p-Shell Nuclei

NUCLEAR STRUCTURE 6Li, 8Be, 10B; calculated ground and excited states energies. No-core shell model, three-body interactions.

doi: 10.1103/PhysRevLett.88.152502
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2001CA50      Phys.Rev. C64, 051301 (2001)

E.Caurier, P.Navratil, W.E.Ormand, J.P.Vary

Intruder States in 8Be

NUCLEAR STRUCTURE 8Be; calculated levels, J, π; deduced intruder states features. 8He, 8Li, 8Be, 8B; calculated binding energies. Large-basis shell model.

doi: 10.1103/PhysRevC.64.051301
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2001GA53      Phys.Rev.Lett. 87, 132502 (2001)

P.E.Garrett, W.E.Ormand, D.Appelbe, R.W.Bauer, J.A.Becker, L.A.Bernstein, J.A.Cameron, M.P.Carpenter, R.V.F.Janssens, C.J.Lister, D.Seweryniak, E.Tavukcu, D.D.Warner

Observation of 46Cr and Testing the Isobaric Multiplet Mass Equation at High Spin

NUCLEAR REACTIONS 12C(36Ar, 2n), E=105 MeV; measured Eγ, Iγ, γγ-, (recoil)γ-coin. 46Cr deduced high-spin levels, J, π. Comparisons with neighboring nuclides, one- and two-body contributions to isovector energy differences discussed. Gammasphere array, fragment mass analyzer.

doi: 10.1103/PhysRevLett.87.132502
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Data from this article have been entered in the XUNDL database. For more information, click here.

2001KU10      Nucl.Phys. A687, 212c (2001)

D.Kusnezov, Y.Alhassid, K.A.Snover, W.E.Ormand

Giant Dipole Resonances in Hot, Rotating Nuclei: Nuclear shapes and shell corrections

NUCLEAR STRUCTURE Sc, Cu, Zr, Mo, Sn, Dy, Pb; calculated GDR width vs temperature and angular momentum. 92,96,100Mo; calculated GDR width as a function of temperature and angular momentum. 44Ti, 90Zr, 120Sn, 168Er, 208Pb; calculated deformation parameters vs temperature and spin for hot rotating nuclei. Shell effects discussed, comparison with data.

doi: 10.1016/S0375-9474(01)00623-6
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2001MA77      Acta Phys.Pol. B32, 2433 (2001)

A.Maj, M.Kmiecik, W.Krolas, J.Styczen, A.Bracco, F.Camera, B.Million, J.J.Gaardhoje, B.Herskind, M.Kicinska-Habior, J.Kownacki, W.E.Ormand

Search for the Jacobi Instability in Rapidly Rotating 46Ti* Nuclei

NUCLEAR REACTIONS 28Si(18O, X), E=98 MeV; measured high-energy Eγ, Iγ, angular distributions. 46Ti deduced GDR decay features, Jacobi instability. Thermal shape fluctuation model.

2001NA33      Phys.Rev.Lett. 87, 172502 (2001)

P.Navratil, J.P.Vary, W.E.Ormand, B.R.Barrett

Six-Nucleon Spectroscopy from a Realistic Nonlocal Hamiltonian

NUCLEAR STRUCTURE 3H, 3,4,6He, 6Li; calculated ground-state energies. 6He, 6Li; calculated levels, J, π, B(E2), B(M1). 6He deduced soft dipole mode. No-core shell model, comparisons with data.

doi: 10.1103/PhysRevLett.87.172502
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2000KM01      Nucl.Phys. A674, 29 (2000)

M.Kmiecik, A.Maj, A.Bracco, F.Camera, M.Casanova, S.Leoni, B.Million, B.Herskind, R.A.Bark, W.E.Ormand

The GDR Width in the Excited 147Eu Compound Nucleus at High Angular Momentum

NUCLEAR REACTIONS 110Pd(37Cl, xn), E=160, 165, 170 MeV; measured Eγ, Iγ, γ multipolarity. 147Eu deduced GDR width, decay features, deformation parameters. BaF2 and HPGe detectors. Statistical model analysis, thermal shape fluctuations.

doi: 10.1016/S0375-9474(00)00166-4
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1999CA25      Phys.Rev. C60, 014306 (1999)

F.Camera, A.Bracco, S.Leoni, B.Million, M.Mattiuzzi, M.Pignanelli, A.Maj, M.Kmiecik, R.Bark, I.Bearden, J.J.Gaardhoje, W.E.Ormand, T.Lonnroth, R.Osterbacka

Probing the Shape of Hot 194Hg at High Spins with the Giant Dipole Resonance Decay in Selected Cascades

NUCLEAR REACTIONS 164Dy(30Si, X), E=142 MeV; measured Eγ, Iγ, γγ-coin. 194Hg deduced GDR width vs angular momentum, no superdeformed effects. Ge, BaF detectors.

doi: 10.1103/PhysRevC.60.014306
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1999GE07      Nucl.Phys. A649, 173c (1999)

G.Gervais, M.Thoennessen, W.E.Ormand

Excitation-Energy Dependent Strength-Function Analysis of Hot GDR Experiments

NUCLEAR STRUCTURE 120Sn; calculated spin and temperature dependent GDR strength functions, γ spectra. Statistical model.

doi: 10.1016/S0375-9474(99)00056-1
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1999OR03      Phys.Rev.Lett. 82, 1101 (1999)


Effects of Isospin-Symmetry Violation on Tests of the Standard Model Using Parity-Violating Electron Scattering

NUCLEAR STRUCTURE 12C, 16O, 28Si; calculated isospin-mixing corrections for parity-violating electron scattering.

doi: 10.1103/PhysRevLett.82.1101
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1999OR06      Nucl.Phys. A649, 145c (1999)


Theoretical Description of the Giant-Dipole Resonance in Hot Nuclei

NUCLEAR STRUCTURE 106,120Sn, 176W, 208Pb; calculated GDR width vs temperature, spin. 106Sn calculated Eγ, Iγ(θ) vs spin. Adiabatic model, large amplitude thermal fluctuations. Comparisons with data.

doi: 10.1016/S0375-9474(99)00052-4
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1999RI05      Phys.Rev.Lett. 82, 4196 (1999)

L.A.Riley, J.K.Jewell, P.D.Cottle, T.Glasmacher, K.W.Kemper, N.Alamanos, Y.Blumenfeld, J.A.Carr, M.J.Chromik, R.W.Ibbotson, F.Marechal, W.E.Ormand, F.Petrovich, H.Scheit, T.Suomijarvi

Inverse Kinematics Proton Scattering on 18Ne and Mirror Symmetry in A = 18 Nuclei

NUCLEAR REACTIONS 1H(18Ne, p), E=30 MeV/nucleon; measured proton spectra, inelastic σ(θ); deduced mirror symmetry. Comparison with n+18O scattering.

doi: 10.1103/PhysRevLett.82.4196
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1998GE07      Phys.Rev. C58, R1377 (1998)

G.Gervais, M.Thoennessen, W.E.Ormand

Temperature Dependence of the Giant Dipole Resonance in 120Sn

NUCLEAR STRUCTURE 120Sn; calculated GDR strength functions, γ-spectra; deduced temperature, spin dependence effects. Statistical model.

doi: 10.1103/PhysRevC.58.R1377
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1998KA31      Phys.Rev. C58, 699 (1998)

A.Kangasmaki, P.Tikkanen, J.Keinonen, W.E.Ormand, S.Raman, Zs.Fulop, A.Z.Kiss, E.Somorjai

Lifetimes of 32S Levels

NUCLEAR REACTIONS 2H(31P, n), E=24, 29 MeV; 28Si(6Li, np), E=8, 12 MeV; 31P(p, γ), E=1.0-1.6 MeV; measured Doppler-broadened Eγ, Iγ. 32S levels deduced T1/2, branching ratios, δ, B(E2), B(M1). DSA analysis, Monte Carlo simulations.

NUCLEAR STRUCTURE 32S; calculated levels, T1/2, δ. Shell model.

doi: 10.1103/PhysRevC.58.699
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1998PA08      Phys.Lett. 422B, 1 (1998)

F.Pan, J.P.Draayer, W.E.Ormand

A Particle-Number-Conserving Solution to the Generalized Pairing Problem

doi: 10.1016/S0370-2693(98)00034-3
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1997AD03      Phys.Lett. 392B, 1 (1997)

A.A.Adams, G.E.Mitchell, W.E.Ormand, J.F.Shriner, Jr.

Distribution of Shell Model Reduced Transition Probabilities in 22Na

NUCLEAR STRUCTURE 22Na; calculated B(λ); deduced chaotic nature related features. Shell model.

doi: 10.1016/S0370-2693(96)01510-9
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1997BE09      Phys.Lett. 393B, 285 (1997)

P.Bednarczyk, J.Styczen, R.Broda, M.Lach, W.Meczynski, W.Nazarewicz, W.E.Ormand, W.Satula, D.Bazzacco, F.Brandolini, G.de Angelis, S.Lunardi, L.Muller, N.H.Medina, C.M.Petrache, C.Rossi Alvarez, F.Scarlassara, G.F.Segato, C.Signorini, F.Soramel

High Spin States in 45Sc and Coexistence of Collective and Non-Collective Structures in the Odd-A f7/2 Nuclei

NUCLEAR REACTIONS 30Si(18O, 2np), (18O, 3n), E=60 MeV; measured γ(recoil)-coin. 12C(35Cl, X), E=75-120 MeV; measured DSA. 45Sc deduced high-spin states, J, π, T1/2, B(λ). 43Ca, 45Ti deduced high-spin states.

doi: 10.1016/S0370-2693(96)01635-8
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1997KA15      Phys.Rev. C55, 1697 (1997)

A.Kangasmaki, P.Tikkanen, J.Keinonen, W.E.Ormand, S.Raman

Lifetimes of 32P Levels

NUCLEAR REACTIONS 2H(31P, p), E ≈ 24, 29 MeV; measured Eγ, Iγ, DSA. 32P deduced levels, J, π, γ-multipolarity, δ(E2/M1), γ-branching ratio, B(λ). Shell model.

doi: 10.1103/PhysRevC.55.1697
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1997MA03      Nucl.Phys. A612, 262 (1997)

M.Mattiuzzi, A.Bracco, F.Camera, W.E.Ormand, J.J.Gaardhoje, A.Maj, B.Million, M.Pignanelli, T.Tveter

Angular Momentum Dependence of the GDR Width in Sn Nuclei at Fixed Excitation Energy

NUCLEAR REACTIONS 48Ti(58Ni, X), E=260 MeV; measured high energy γ(evaporation residue)-coin. 106Sn deduced GDR width angular dependence. Adiabatic model, thermal fluctuations, 176W GDR features analyzed.

doi: 10.1016/S0375-9474(96)00335-1
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1997NA17      Phys.Rev. C56, 2542 (1997)

P.Navratil, B.R.Barrett, W.E.Ormand

Large-Basis Shell-Model Calculation of the 10C → 10B Fermi Matrix Element

NUCLEAR STRUCTURE 10B; calculated levels, binding energy, magnetic, quadrupole moments. 10C; calculated binding energy, charge radius; deduced β-decay isospin mixing role. Large basis shell model calculations.

doi: 10.1103/PhysRevC.56.2542
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1997OR02      Nucl.Phys. A614, 217 (1997)

W.E.Ormand, P.F.Bortignon, R.A.Broglia, A.Bracco

Behavior of the Giant-Dipole Resonance in 120Sn and 208Pb at High Excitation Energy

NUCLEAR STRUCTURE 208Pb; calculated Nilsson-Strutinsky shell corrections to free energy, moments of inertia, GDR strength function vs temperature, particle evaporation width. 120Sn; calculated GDR strength function vs temperature.

doi: 10.1016/S0375-9474(96)00464-2
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1997OR04      Phys.Rev. C55, 2407 (1997)


Mapping the Proton Drip Line up to A = 70

NUCLEAR STRUCTURE 46,47,48Mn, 46,47,48,49Fe, 47,48,49,50,51,52Co, 49,50,51,52,53Ni, 49,50,51,52,53,54,55,56Cu, 50,52,53,54,55,56,57Zn, 54,55,56,57,58,59,60,61Ga, 56,57,58,59,60,61,62,63Ge, 58,59,60,61,62,63,64,65As, 62,63,64,65,66,67Se, 65,66,67,68,69Br, 66,67,68,69Kr, 68,70Rb; calculated binding energy, one-, two-proton separation energy, β-decay endpoint energy, Q(EC). 38Ti, 45Fe, 48,49Ni, 55Zn, 59Ge, 63,64Se, 66,67,68,69Kr; calculated di-proton emission T1/2, one-, two-proton separation energies. Coulomb energy difference from shell model.

doi: 10.1103/PhysRevC.55.2407
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1997OR05      Nucl.Phys. A618, 20 (1997)

W.E.Ormand, P.F.Bortignon, R.A.Broglia

Effects of Angular Momentum Projection on the Nuclear Partition Function and the Observation of the Giant-Dipole Resonance in Hot Nuclei

NUCLEAR STRUCTURE 106Sn, 208Pb; calculated GDR associated σ(Eγ), a2 coefficients vs Eγ. Different angular momentum projection methods.

doi: 10.1016/S0375-9474(97)00027-4
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1997OR07      Acta Phys.Pol. B28, 87 (1997)


Shell-Model Studies of Nuclei at the Proton Drip-Line

1997OR08      Phys.Rev. C56, R1678 (1997)


Estimating the Nuclear Level Density with the Monte Carlo Shell Model

NUCLEAR STRUCTURE 24Mg; calculated levels, level densities; 32S; calculated levels; 26,27,28,29,30,31,32,33,34,35,36O; calculated binding energy; 20Ne; calculated energy, partition function vs inverse temperature. Monte Carlo shell model, universal sd-shell Hamiltonian, comparison with surface-delta interaction model.

doi: 10.1103/PhysRevC.56.R1678
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1996OR01      Phys.Rev. C53, 214 (1996)


Properties of Proton Drip-Line Nuclei at the sd-fp-Shell Interface

NUCLEAR STRUCTURE A=37-48; calculated binding energies, one-, two-proton, β end-point energies, one-, two-proton emission T1/2, β-decay branching ratio vs daughter excitation energy; deduced 38Ti, 45Fe suitability for correlated 2p-emission. Shell model.

doi: 10.1103/PhysRevC.53.214
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1996OR03      Nucl.Phys. A599, 57c (1996)

W.E.Ormand, P.F.Bortignon, R.A.Broglia

The Temperature Dependence of the Width of the Giant-Dipole Resonance

NUCLEAR STRUCTURE 208Pb, 120Sn; calculated GDR strength function. Adiabatic model.

doi: 10.1016/0375-9474(96)00047-4
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1996OR04      Phys.Rev.Lett. 77, 607 (1996)

W.E.Ormand, P.F.Bortignon, R.A.Broglia

Temperature Dependence of the Width of the Giant Dipole Resonance in 120Sn and 208Pb

NUCLEAR STRUCTURE 120Sn, 208Pb; calculated GDR strength function vs temperature; deduced shell corrections caused mass dependence.

doi: 10.1103/PhysRevLett.77.607
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1995EN04      Phys.Rev. C52, 2216 (1995)

J.Engel, M.T.Ressell, I.S.Towner, W.E.Ormand

Response of Mica to Weakly Interacting Massive Particles

doi: 10.1103/PhysRevC.52.2216
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1995OR01      Phys.Lett. 345B, 343 (1995)

W.E.Ormand, P.M.Pizzochero, P.F.Bortignon, R.A.Broglia

Neutrino Capture Cross Sections for 40Ar and β-Decay of 40Ti

NUCLEAR REACTIONS 40Ar(ν, X), E=solar; calculated absorption σ. Shell model.

RADIOACTIVITY 40Ti(β+); calculated β-decay matrix elements, T1/2, branching ratios. Shell model.

doi: 10.1016/0370-2693(94)01605-C
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1995OR03      Phys.Rev. C52, 2455 (1995)

W.E.Ormand, B.A.Brown

Isospin-Mixing Corrections for fp-Shell Fermi Transitions

NUCLEAR STRUCTURE A=10-74; calculated isospin mixing corrections, ft values in some cases. Superallowed Fermi transitions, shell model.

doi: 10.1103/PhysRevC.52.2455
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1994AL06      Phys.Rev.Lett. 72, 613 (1994)

Y.Alhassid, D.J.Dean, S.E.Koonin, G.Lang, W.E.Ormand

Practical Solution to the Monte Carlo Sign Problem: Realistic calculations of 54Fe

NUCLEAR STRUCTURE 54Fe; calculated isoscalar, isovector quadrupole, Gamow-Teller transition strengths; deduced Gamow-Teller β+ strength quenching, solution to Monte Carlo sign problem.

doi: 10.1103/PhysRevLett.72.613
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1994DE31      Phys.Rev.Lett. 72, 4066 (1994)

D.J.Dean, P.B.Radha, K.Langanke, Y.Alhassid, S.E.Koonin, W.E.Ormand

Complete 0(h-bar x Omega) Calculations of Gamow-Teller Strengths for Nuclei in the Iron Region

NUCLEAR STRUCTURE 56,54Fe, 56,58Ni, 54Cr, 55Mn; calculated B(λ), quadrupole moments, Gamow-Teller transition strength. Shell model, Monte Carlo techniques, different interactions.

doi: 10.1103/PhysRevLett.72.4066
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1994OR01      Phys.Rev. C49, 1422 (1994)

W.E.Ormand, D.J.Dean, C.W.Johnson, G.H.Lang, S.E.Koonin

Demonstration of the Auxiliary-Field Monte Carlo Approach for sd-Shell Nuclei

NUCLEAR STRUCTURE 20,22,24,26Ne, 22Na; calculated energy, quadrupole moment, other operators expectation value. 22Ne; calculated response functions; deduced shape features. Auxiliary-field Monte Carlo approach.

doi: 10.1103/PhysRevC.49.1422
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1994OR02      Nucl.Phys. A569, 63c (1994)


Future Microscopic Developments for the GDR in Hot Nuclei

NUCLEAR STRUCTURE 16O, 20Ne; analyzed imaginary-time autocorrelation function for T=1 dipole transition. Auxiliary-field Monte Carlo methods.

doi: 10.1016/0375-9474(94)90096-5
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1994OR03      Nucl.Phys. A570, 257c (1994)


Monte Carlo Methods for the Shell Model

NUCLEAR STRUCTURE 24Mg, 48Cr; calculated Hamiltonian, J2 expectation values vs deformation for thermal, ground states. 22Ne; calculated isoscalar quandrupole response function. Shell model, Monte Carlo procedures.

doi: 10.1016/0375-9474(94)90290-9
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1993BO11      Nucl.Phys. A553, 501c (1993)

P.F.Bortignon, A.Bracco, F.De Blasio, W.E.Ormand, R.A.Broglia

Fluctuations and Critical Temperature in the Study of Collective Motion in Excited Nuclei

NUCLEAR STRUCTURE 40Ca, 92Mo; analyzed data; deduced GDR properties.

doi: 10.1016/0375-9474(93)90647-G
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1993DE28      Phys.Lett. 317B, 275 (1993)

D.J.Dean, S.E.Koonin, G.H.Lang, W.E.Ormand, P.B.Radha

Shell Model Monte Carlo Calculations for 170Dy

NUCLEAR STRUCTURE 170Dy; calculated various statitic observables, free energy coutours. Shell model Monte Carlo calculations.

doi: 10.1016/0370-2693(93)90995-T
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1993LA24      Phys.Rev. C48, 1518 (1993)

G.H.Lang, C.W.Johnson, S.E.Koonin, W.E.Ormand

Monte Carlo Evaluation of Path Integrals for the Nuclear Shell Model

NUCLEAR STRUCTURE 24Mg, 20Ne; calculated <H>, <J2> vs deformation parameter. Shell model, Monte Carlo evaluation of path integrals.

doi: 10.1103/PhysRevC.48.1518
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1993OR02      Phys.Lett. 308B, 207 (1993)

W.E.Ormand, P.M.Pizzochero, P.F.Bortignon, R.A.Broglia

The Solar Neutrino Capture Cross Section for 23Na

NUCLEAR REACTIONS 23Na(ν, e-), (ν-bar, e+), E ≈ 3-15 MeV; calculated solar neutrino absorption rate, capture σ vs E. Standard solar model.

doi: 10.1016/0370-2693(93)91272-O
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1993VO01      Phys.Rev. C47, 623 (1993)

P.Vogel, W.E.Ormand

Spin-Isospin SU(4) Symmetry in sd- and fp-Shell Nuclei

NUCLEAR STRUCTURE 16O, 20Ne, 24Mg, 28Si, 32S, 36Ar, 19F, 23Na, 27Al, 31P, 35Cl, 39K, 42,44,46,48,50,52,54,56,58Ca; calculated SU(4) overlaps for J(π)=0+, 1+ states. Shell model, Wildenthal interaction.

doi: 10.1103/PhysRevC.47.623
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1992JO07      Phys.Rev.Lett. 69, 3157 (1992)

C.W.Johnson, S.E.Koonin, G.H.Lang, W.E.Ormand

Monte Carlo Methods for the Nuclear Shell Model

NUCLEAR STRUCTURE 24Mg, 20Ne, 48Cr; calculated ground state, thermal few body operators expectation values.

doi: 10.1103/PhysRevLett.69.3157
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1992OR04      Phys.Rev. C46, 1710 (1992)

W.E.Ormand, R.A.Broglia

Spectral Properties of Shell-Model Hamiltonians

NUCLEAR STRUCTURE 46V, 26Al; calculated for given J, π level nearest neighbor spacing; deduced eigenvalue spectral properties. Shell model hamiltonian.

doi: 10.1103/PhysRevC.46.1710
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1992OR05      Phys.Rev.Lett. 69, 2905 (1992)

W.E.Ormand, F.Camera, A.Bracco, A.Maj, P.F.Bortignon, B.Million, R.A.Broglia

Evidence for Different Time Scales Controlling Thermal Fluctuations in Hot Nuclei

NUCLEAR STRUCTURE 92Mo; analyzed strength function, GDR photoabsorption σ(E), σ(E, θ) a2 coefficient, hot nuclei; deduced thermal fluctuations control of different time scales.

doi: 10.1103/PhysRevLett.69.2905
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1990OR02      Phys.Rev.Lett. 64, 2254 (1990)

W.E.Ormand, P.F.Bortignon, R.A.Broglia, T.Dossing, B.Lauritzen

Time-Dependent Thermal Fluctuations and the Giant Dipole Resonance in Hot, Rotating Nuclei

NUCLEAR REACTIONS 110Sn, 166Er(γ, X), E ≈ 10-18 MeV; calculated photoabsorption σ(E); deduced GDR narrowing features. Hot nuclei, thermal fluctuations shape dependence.

doi: 10.1103/PhysRevLett.64.2254
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1990OR04      Nucl.Phys. A520, 595c (1990)

W.E.Ormand, A.Bracco, P.F.Bortignon, R.A.Broglia

Limiting Temperatures for Collective Motion in Nuclei

NUCLEAR REACTIONS 70Ge(40Ar, X), E=15-24 MeV/nucleon; measured γ-multiplicity vs E. 110Sn deduced GDR coupling width temperature dependence. Central collisions plus statistical decay model.

doi: 10.1016/0375-9474(90)91177-S
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1990OR05      Nucl.Phys. A519, 61c (1990)

W.E.Ormand, P.F.Bortignon, R.A.Broglia, T.Dossing, B.Lauritzen

Time-Dependent Thermal Fluctuations and the Giant-Dipole Resonance in Hot, Rotating Nuclei

NUCLEAR STRUCTURE 110Sn, 166Er; analyzed data; deduced GDR parameters, thermal shape fluctuations role.

doi: 10.1016/0375-9474(90)90615-S
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1989OR01      Phys.Rev.Lett. 62, 866 (1989)

W.E.Ormand, B.A.Brown

Corrections to the Fermi Matrix Element for Superallowed β Decay

RADIOACTIVITY 14O, 26mAl, 34Cl, 38mK, 42Sc, 46V, 50Mn, 54Co; calculated log ft corrections.

doi: 10.1103/PhysRevLett.62.866
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1989OR02      Nucl.Phys. A491, 1 (1989)

W.E.Ormand, B.A.Brown

Empirical Isospin-Nonconserving Hamiltonians for Shell-Model Calculations

NUCLEAR STRUCTURE A=9-59; calculated isospin nonconserving Hamiltonian parameters.

doi: 10.1016/0375-9474(89)90203-0
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1989OR08      Phys.Rev. C40, 1510 (1989)

W.E.Ormand, P.F.Bortignon, A.Bracco, R.A.Broglia

Nuclear Level-Density Parameter in Hot Nuclei

NUCLEAR STRUCTURE 63Cu, 110Sn, 155Er; calculated level density parameters vs temperature, angular momentum.

doi: 10.1103/PhysRevC.40.1510
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1989OR09      Phys.Rev. C40, 2914 (1989)

W.E.Ormand, B.A.Brown, B.R.Holstein

Limits on the Presence of Scalar and Induced-Scalar Currents in Superallowed β Decay

RADIOACTIVITY 16O, 26mAl, 34Cl, 38mK, 42Sc, 46V, 50Mn, 54Co; analyzed β-decay ft values; deduced limits on scalar, induced scalar coupling constants.

doi: 10.1103/PhysRevC.40.2914
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1988BR13      Nucl.Phys. A482, 141c (1988)

R.A.Broglia, W.E.Ormand, M.Borromeo

The Shapes and Hopping Times of Hot Nuclei

NUCLEAR STRUCTURE 108Sn; calculated GDR damping width vs temperature. Hot nuclei.

doi: 10.1016/0375-9474(88)90581-7
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1988LA10      Phys.Lett. 207B, 238 (1988)

B.Lauritzen, R.A.Broglia, W.E.Ormand, T.Dossing

Motional Narrowing in the Dampling of Giant Resonances in Hot Nuclei

NUCLEAR STRUCTURE 108Sn; calculated GDR strength function vs temperature.

doi: 10.1016/0370-2693(88)90567-9
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1988MO18      Phys.Rev. C38, 737 (1988)

M.F.Mohar, E.Adamides, W.Benenson, C.Bloch, B.A.Brown, J.Clayton, E.Kashy, M.Lowe, J.A.Nolen, Jr., W.E.Ormand, J.van der Plicht, B.Sherrill, J.Stevenson, J.S.Winfield

Mass of 39Sc via the 40Ca(7Li, 8He) Reaction

NUCLEAR REACTIONS 40Ca(7Li, 8He), E=27.24 MeV/nucleon; measured σ(E(8He)); deduced Q, mass equation parameters. 39Sc deduced mass excess. Isobaric multiplet mass equation, isospin-nonconserving Hamiltonian.

doi: 10.1103/PhysRevC.38.737
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1986OR02      Phys.Lett. 174B, 128 (1986)

W.E.Ormand, B.A.Brown

Isospin-Forbidden Proton and Neutron Emission in 1s-0d Shell Nuclei

NUCLEAR STRUCTURE A=21-37; calculated T=3/2 state isospin forbidden nucleon emission decay spectroscopic amplitudes.

doi: 10.1016/0370-2693(86)90726-4
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1985OR04      Nucl.Phys. A440, 274 (1985)

W.E.Ormand, B.A.Brown

Calculated Isospin-Mixing Corrections to Fermi β-Decays in 1s0d-Shell Nuclei with Emphasis on A = 34

RADIOACTIVITY 22Mg, 34Cl, 34Ar(β+); calculated superallowed β-decay, Fermi matrix elements.

doi: 10.1016/0375-9474(85)90341-0
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1983SH31      Phys.Rev. C28, 1712 (1983)

B.Sherrill, K.Beard, W.Benenson, B.A.Brown, E.Kashy, W.E.Ormand, H.Nann, J.J.Kehayias, A.D.Bacher, T.E.Ward

Mass of 59Zn

NUCLEAR STRUCTURE A=41-59; analyzed Coulomb energy systematics. New data on 59Zn input.

RADIOACTIVITY 59Zn(β+); calculated ft. Latest mass measurement input.

NUCLEAR REACTIONS 58Ni(p, π-), E=190 MeV; measured σ(E(π)), σ(θ), Q. 40Ca(p, π-), E=190 MeV; measured σ(reaction) upper limit. 59Zn deduced mass.

doi: 10.1103/PhysRevC.28.1712
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