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Search: Author = L.C.Vaz

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1990DE11      Phys.Rev. C41, R1885 (1990)

P.A.DeYoung, C.J.Gelderloos, D.Kortering, J.Sarafa, K.Zienert, M.S.Gordon, B.J.Fineman, G.P.Gilfoyle, X.Lu, R.L.McGrath, D.M.de Castro Rizzo, J.M.Alexander, G.Auger, S.Kox, L.C.Vaz, C.Beck, D.J.Henderson, D.G.Kovar, M.F.Vineyard

Particle-Particle Correlations and Lifetimes of Composite Nuclei: New tests for the evaporation model and for statistical equilibration

NUCLEAR REACTIONS 27Al(16O, 2p), (16O, pd), E=80-250 MeV; measured pp-, pd-correlations; deduced evaporative decay T1/2. Statistical model.

doi: 10.1103/PhysRevC.41.R1885
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1989DE02      Phys.Rev. C39, 128 (1989)

P.A.DeYoung, M.S.Gordon, Xiuqin Lu, R.L.McGrath, J.M.Alexander, D.M.de Castro Rizzo, L.C.Vaz

Emission Times in Low-Energy Heavy-Ion Reactions by Particle-Particle Correlations

NUCLEAR REACTIONS 27Al(16O, 2p), (16O, 2α), E=140 MeV; measured pp, αα correlations; deduced successive proton emission interval T1/2, (αα) correlations problematics.

doi: 10.1103/PhysRevC.39.128
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1989PE01      Phys.Rev. C39, 488 (1989)

G.F.Peaslee, N.N.Ajitanand, J.M.Alexander, R.Lacey, L.C.Vaz, M.Kaplan, M.Kildir, D.J.Moses, D.Logan, M.S.Zisman

Particle-Particle Coincidence Measurements for 1,2,3H and 4He in the Reaction 480 MeV 56Fe + (nat)Ag

NUCLEAR REACTIONS Ag(56Fe, pX), (56Fe, dX), (56Fe, tX), (56Fe, αX), E=480 MeV; measured (particle)(particle)-coin; deduced average particle multiplicities, energy removed, effective emission barriers.

doi: 10.1103/PhysRevC.39.488
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1988LA12      Phys.Rev. C37, 2540 (1988)

R.Lacey, N.N.Ajitanand, J.M.Alexander, D.M.de Castro Rizzo, G.F.Peaslee, L.C.Vaz, M.Kaplan, M.Kildir, G.La Rana, D.J.Moses, W.E.Parker, D.Logan, M.S.Zisman, P.DeYoung, L.Kowalski

Mechanisms for Light Charged Particle Emission in the Reactions 247 and 337 MeV 40Ar + (nat)Ag

NUCLEAR REACTIONS Ag(40Ar, pX), (40Ar, dX), (40Ar, tX), (40Ar, αX), (40Ar, X), E=247, 337 MeV; measured σ(θ), σ(Eα, θα); deduced pre-, post scission emission multiplicities. Deformed emitters.

doi: 10.1103/PhysRevC.37.2540
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1988LA13      Phys.Rev. C37, 2561 (1988)

R.Lacey, N.N.Ajitanand, J.M.Alexander, D.M.de Castro Rizzo, G.F.Peaslee, L.C.Vaz, M.Kaplan, M.Kildir, G.La Rana, D.J.Moses, W.E.Parker, D.Logan, M.S.Zisman, P.DeYoung, L.Kowalski

Large-Angle Correlations between 4He and 1,2,3H or 4He in the Reactions 247 and 337 MeV 40Ar + (nat)Ag: Unexpected properties of the nuclear stratosphere

NUCLEAR REACTIONS Ag(40Ar, αX), E=247, 337 MeV; measured α(light fragment)-coin, energy correlations; deduced emission source properties, mechanism.

doi: 10.1103/PhysRevC.37.2561
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1988PE16      Phys.Rev. C38, 1730 (1988)

G.F.Peaslee, N.N.Ajitanand, J.M.Alexander, D.Guerreau, R.Lacey, L.C.Vaz, M.Kaplan, M.Kildir, D.J.Moses, D.Logan, M.S.Zisman

Sources of Light-Charged-Particle Emission in the Reaction 480 MeV 56Fe + (nat)Ag

NUCLEAR REACTIONS Ag(56Fe, pX), (56Fe, dX), (56Fe, tX), (56Fe, αX), E=480 MeV; measured σ(fragment θ), σ(E(X), θ(X)) for X=p, d, t, α; deduced reaction, particle emission mechanisms.

doi: 10.1103/PhysRevC.38.1730
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1987LA13      Phys.Lett. 191B, 253 (1987)

R.Lacey, N.N.Ajitanand, J.M.Alexander, D.M.De Castro Rizzo, P.DeYoung, M.Kaplan, L.Kowalski, G.La Rana, D.Logan, D.J.Moses, W.E.Parker, G.F.Peaslee, L.C.Vaz

Surprising Properties of the Nuclear Stratosphere Indicated by Energy Spectra and Large-Angle Correlations between 4He and 1,2,3H or 4He

NUCLEAR REACTIONS Ag(40Ar, pα), (40Ar, dα), (40Ar, tα), (40Ar, 2α), E=337 MeV; measured σ(Eα, θα), αp-, αd-, αt-, αα-coin. Gas ionization, solid state Si telescopes. Theoretical calculations.

doi: 10.1016/0370-2693(87)90250-4
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1987MO05      Nucl.Phys. A465, 339 (1987)

D.J.Moses, M.Kaplan, M.Kildir, D.R.G.Logan, G.La Rana, W.E.Parker, R.Lacey, G.F.Peaslee, J.M.Alexander, N.N.Ajitanand, L.C.Vaz, M.S.Zisman

Light Charged Particle Emission in 485 MeV 56Fe + 197Au Reactions: Correlations with heavy fragments and relationships to spin and lifetime

NUCLEAR REACTIONS 197Au(56Fe, X), (56Fe, F), E=485 MeV; measured σ(Eα, θα, fragment θ), σ(Ep), σ(Eα), σ(Ep, θp, fragment θ) following fission, deep inelastic scattering; deduced evaporative light-particle multiplicities for each emission source. 252Db deduced T1/2.

doi: 10.1016/0375-9474(87)90438-6
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1986AJ03      Phys.Rev. C34, 877 (1986)

N.N.Ajitanand, G.La Rana, R.Lacey, D.J.Moses, L.C.Vaz, G.F.Peaslee, D.M.de Castro Rizzo, M.Kaplan, J.M.Alexander

Clues to the Shapes of very Hot Nuclei: Calculated patterns for evaporative emission from deformed nuclei

NUCLEAR REACTIONS 197Au(56Fe, X), E=485 MeV; 27Al(40Ar, X), E=190 MeV; calculated evaporative <Eα>, anisotropies; deduced nuclear shape dependences.

doi: 10.1103/PhysRevC.34.877
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1986VA20      Z.Phys. A324, 331 (1986)

L.C.Vaz, J.M.Alexander, N.Carjan

Comparison of Semiclassical and Quantum Mechanical Angular Distributions for Nuclear Fission and Evaporation

NUCLEAR REACTIONS 56Fe(α, αX), E=17 MeV; 159Tb(22Ne, αX), E=60, 176 MeV; calculated evaporation α-anisotropy. 248Cm(32S, F), E=218 MeV; calculated fission fragment anisotropy. Semi-classical, quantum mechanical methods.


1985MO04      Z.Phys. A320, 229 (1985)

D.J.Moses, M.Kaplan, J.M.Alexander, D.Logan, M.Kildir, L.C.Vaz, N.N.Ajitanand, E.Duek, M.S.Zisman

Particle Spectra from Reversed Kinematics: Powerful probes of hot rotating nuclei

NUCLEAR REACTIONS 12C(40Ar, pX), (40Ar, αX), (56Fe, pX), (56Fe, αX), (86Kr, pX), (86Kr, αX), E=8.5 MeV/nucleon; measured inclusive σ(θ, Ep), σ(θ, Eα); deduced effective evaporation emission, fusion barriers. Hot spot, moving source model.

doi: 10.1007/BF01881270
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1984AJ02      Z.Phys. A316, 169 (1984)

N.N.Ajitanand, J.M.Alexander, H.Delagrange, E.Duek, D.O.Eriksen, D.Guerreau, M.Kaplan, M.Kildir, L.Kowalski, R.Lacey, D.Logan, D.J.Moses, G.F.Peaslee, L.C.Vaz, M.S.Zisman

Multiplicities for Evaporative 4He Emission in Heavy Ion Reactions: Relationships to spin and lifetime expectancy of the composite nucleus

NUCLEAR REACTIONS Ag, 238U(40Ar, αX), (56Fe, αX), (40Ar, αF), (56Fe, αF), E=8.5 MeV/nucleon; measured σ(fragment θ, θα, Eα), fission-fusion, projectile-like fragment-coin; deduced reaction mechanism, hot nucleus thermodynamic properties.

doi: 10.1007/BF01412259
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1984DU09      Z.Phys. A317, 83 (1984)

E.Duek, N.N.Ajitanand, J.M.Alexander, D.Logan, M.Kildir, L.Kowalski, L.C.Vaz, D.Guerreau, M.S.Zisman, M.Kaplan, D.J.Moses

Mechanisms for Emission of 4He in the Reactions of 334 MeV 40Ar with 238U

NUCLEAR REACTIONS 238U(40Ar, αF), E=334 MeV; measured fission (fragment)(fragment)(α)-coin, σ(θα, Eα); deduced fission, α-emission mechanisms.

doi: 10.1007/BF01420452
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1984KI07      Z.Phys. A317, 291 (1984)

M.Kildir, D.Logan, D.O.Eriksen, D.J.Moses, M.Kaplan, E.Duek, L.C.Vaz, N.N.Ajitanand, J.M.Alexander, M.S.Zisman

Fission Reactions of 468-MeV 56Fe + 238U: Detection of 4He/1H Emission from Pre- and Post-Fission Sources

NUCLEAR REACTIONS 238U(56Fe, pF), (56Fe, αF), E=469 MeV; measured fission (fragment)(fragment)(θ), σ(θp, Ep, fragment θ), σ(θα, Eα, fragment θ), proton, α differential multiplicities, σ(θα, Eα); deduced light particle emission mechanism.

doi: 10.1007/BF01438361
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1984VA01      Phys.Rev.Lett. 52, 396 (1984)

L.C.Vaz, J.M.Alexander

Fission Anisotropies and Sequential Fission

NUCLEAR REACTIONS 238U(16O, F), E=110, 130, 148 MeV; calculated fission σ following fusion, fissile nucleus maximum spin, moment of inertia ratios. Reanalysis of data.

doi: 10.1103/PhysRevLett.52.396
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1984VA05      Z.Phys. A315, 169 (1984)

L.C.Vaz, D.Logan, E.Duek, J.M.Alexander, M.F.Rivet, M.S.Zisman, M.Kaplan, J.W.Ball

Fission and Emission of H and He in the Reactions of 215 MeV 16O with 181Ta, 208Pb and 238U

NUCLEAR REACTIONS 12C, 181Ta, 208Pb, 238U(16O, pX), (16O, αX), E=215 MeV; 181Ta, 208Pb, 238U(16O, dX), (16O, tX), E=215 MeV; measured inclusive σ(Ep), σ(Eα), σ(Ed), σ(Et), σ(θ), σ(θ, Ep), σ(θ, Eα). 209Bi, 238U(16O, F), E=215 MeV; measured fission σ; deduced evaporative emission effective barriers.

doi: 10.1007/BF01419376
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1984VA26      Z.Phys. A318, 231 (1984)

L.C.Vaz, J.M.Alexander

Empirical and Theoretical Fusion Barriers for 1H and 4He: Connections to evaporation from hot nuclei

NUCLEAR REACTIONS, ICPND 59Co, 94Zr(p, X), E(cm)=2-6 MeV; 116Cd, 139La(p, X), E(cm)=2-8 MeV; 98Mo, 119Sn(p, X), E(cm) ≈ 2.5-7 MeV; 103Rh(p, X), E(cm)=2-12 MeV; 233U(p, X), E(cm)=5-13 MeV; 40Ca(α, X), E(cm) ≈ 5-19 MeV; 48Ti(α, X), E(cm) ≈ 5-8 MeV; 51V(α, X), E(cm)=6-10 MeV; 59Co(α, X), E(cm) ≈ 8-20 MeV; 164Dy(α, X), E(cm) ≈ 15-25 MeV; 208Pb(α, X), E(cm) ≈ 17-21 MeV; 209Bi(α, X), E(cm) ≈ 16-20 MeV; 233U(α, X), E(cm)=18-30 MeV; calculated fusion σ(E); deduced projectile fusion barriers. 181Ta(16O, α), E=215 MeV; 56Fe(12C, p), E=480 MeV; calculated evaporation σ(θα, Eα), σ(θp, Ep).

doi: 10.1007/BF01413474
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1983DU14      Phys.Lett. 131B, 297 (1983)

E.Duek, N.N.Ajitanand, J.M.Alexander, D.Logan, M.Kildir, L.Kowalski, L.C.Vaz, D.Guerreau, M.S.Zisman, M.Kaplan

New Probe of Interediate Reaction Times: Near-Scission Emission of 4He for 334 MeV 40Ar + 238U

NUCLEAR REACTIONS 238U(40Ar, αX), (40Ar, αF), E= 334 MeV; measured α(fragment)-coin following fusion, fission; deduced fragment, composite nucleus evaporation upper limit, near scission role.

doi: 10.1016/0370-2693(83)90502-6
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1983VA10      Z.Phys. A311, 89 (1983)

L.C.Vaz, D.Logan, J.M.Alexander, E.Duek, D.Guerreau, L.Kowalski, M.F.Rivet, M.S.Zisman

Products of 3 ≤ Z ≤ 9 from Long-Lived Intermediates in the Reactions 336 MeV 40Ar + Ag, 154Sm and Au

NUCLEAR REACTIONS 107,109Ag, 197Au, 154Sm(40Ar, 7Li), (40Ar, 9Be), (40Ar, 11B), (40Ar, 12C), (40Ar, 14N), (40Ar, 16O), (40Ar, 19F), E=336 MeV; measured σ(fragment θ), σ(fragment θ, E); deduced fission σ, σ(evaporation residue), σ(fusion), σ(reaction). 149Tb, 194Hg deduced effective emission barriers, rms spin values. Semi-classical analysis.

doi: 10.1007/BF01411611
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1983VA17      Z.Phys. A312, 163 (1983)

L.C.Vaz, J.M.Alexander

A Reconsideration of Fission Fragment Angular Distributions from Nuclei of High Spin

NUCLEAR REACTIONS 197Au, 209Bi(20Ne, F), E=220 MeV; 238U(16O, F), E=90-148 MeV; 208Pb(32S, F), E=185-225 MeV; 238U(40Ar, F), E=340 MeV; analyzed fission fragment anisotropy data; deduced effective moment of inertia, other fission parameters. Standard rigid rotor theory, limitations discussed.

doi: 10.1007/BF01412159
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1982AL26      Z.Phys. A307, 149 (1982)

J.M.Alexander, H.Delagrange, M.Rajagopalan, M.F.Rivet, L.C.Vaz

Anomalous Behavior of Evaporative H/He from 194Hg Compound Nuclei

NUCLEAR REACTIONS 174Yb(20Ne, xp), (20Ne, xα), E=252 MeV; 154Sm(40Ar, xp), (40Ar, xα), E=340 MeV; analyzed σ(evaporation) data. 194Hg deduced decay energy, spin dependence, mechanism. Bohr's independence hypothesis.

doi: 10.1007/BF01414829
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1982KI06      Z.Phys. A306, 323 (1982)

M.Kildir, D.Logan, M.Kaplan, M.S.Zisman, D.Guerreau, J.M.Alexander, L.C.Vaz

Studies of 4He Emission in Both Fusion-Like and Inelastic Reactions of 340-MeV 40Ar + 238U

NUCLEAR REACTIONS 238U(40Ar, αF), E=340 MeV; measured σ(θα, Eα), (fragment)(fragment)α-coin; deduced fusion-fission, sequential fission induced direct, evaporation α emission.

doi: 10.1007/BF01432373
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1982RA06      Phys.Rev. C25, 2417 (1982)

M.Rajagopalan, D.Logan, J.W.Ball, M.Kaplan, H.Delagrange, M.F.Rivet, J.M.Alexander, L.C.Vaz, M.S.Zisman

Charged Particle Emission from 194Hg Compound Nuclei: Energy and spin dependence of fission-evaporation competition

NUCLEAR REACTIONS, ICPND 182W(12C, F), (12C, p), (12C, d), (12C, t), (12C, α), E=77-167 MeV; 175Lu(19F, F), (19F, p), (19F, d), (19F, t), (19F, α), E=135, 184 MeV; 174Yb(20Ne, F), (20Ne, p), (20Ne, d), (20Ne, t), (20Ne, α), E=125, 252 MeV; 154Sm(40Ar, F), (40Ar, p), (40Ar, d), (40Ar, t), (40Ar, α), E=196-340 MeV; measured σ(E), fission σ, fusion σ, evaporation residue σ vs E; deduced reaction mechanism. 194Hg deduced fission, evaporation competition spin, energy dependences. Statistical model.

doi: 10.1103/PhysRevC.25.2417
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1979DE38      Phys.Rev. C20, 1731 (1979)

H.Delagrange, L.C.Vaz, J.M.Alexander

Optical Model Analysis for 16O + 208Pb: Evidence for Dynamic Shape or Density Changes

NUCLEAR REACTIONS 208Pb(16O, X), E=80-102 MeV; analyzed fusion, reaction data. 208Pb(16O, 16O), E=80-313 MeV; analyzed σ(θ); deduced dynamical shape or density adjustment during collision. Optical potential, proximity formulation.

doi: 10.1103/PhysRevC.20.1731
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1978VA10      Phys.Rev. C18, 820 (1978)

L.C.Vaz, J.M.Alexander, E.H.Auerbach

Classical, Semiclassical, and Quantum Mechanical Calculations for Scattering and Reactions of 16O + 208Pb

NUCLEAR REACTIONS 208Pb(16O, X), (16O, 16O), E=80-192 MeV; calculated σ(θ).

doi: 10.1103/PhysRevC.18.820
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1978VA11      Phys.Rev. C18, 833 (1978)

L.C.Vaz, J.M.Alexander

Elastic Scattering and Total Reaction Cross Sectons: Refractive Scattering or Strong Absorption

NUCLEAR REACTIONS 108Ag(14N, 14N), E=113 MeV; 28Si(16O, 16O), E=81 MeV; 208Pb(20Ne, 20Ne), E=161.2 MeV; 27Al(32S, 32S), E=110 MeV; 60Ni(16O, 16O), E=61.4 MeV; calculated σ(θ).

doi: 10.1103/PhysRevC.18.833
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1974AL21      Phys.Rev.Lett. 33, 1487 (1974)

J.M.Alexander, L.C.Vaz, S.Y.Lin

Static Nuclear Deformation and the Total Reaction Cross Section

NUCLEAR REACTIONS 208Pb, 209Bi, 233U, 237Np(α, X), E=16-22 MeV; calculated total σ.

doi: 10.1103/PhysRevLett.33.1487
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1974VA14      Phys.Rev. C10, 464 (1974)

L.C.Vaz, J.M.Alexander

Systematics of Reaction Cross Sections and Interaction Barriers for Charged Particles

COMPILATION Z=8-92; compiled interaction barrier parameters.

doi: 10.1103/PhysRevC.10.464
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1972LU03      Nucl.Phys. A190, 229 (1972)

C.C.Lu, L.C.Vaz, J.R.Huizenga

Level Densities from Spectra of Different Reactions Populating the Same Nucleus

NUCLEAR REACTIONS 59Co, 62Ni, 63,65Cu(p, p'), (p, α), E approx 12 MeV; 56Fe, 59Co, 60,62Ni(α, p), (α, α'), E approx 16 MeV; 63,65Cu(α, α'), E=17 MeV; measured, calculated σ(Eα'), σ(Eα), σ(Ep'), σ(Ep). 56Fe, 59Co, 60Ni, 62Ni, 63Cu, 65Cu deduced level density parameters. Isotopically separated targets.

doi: 10.1016/0375-9474(72)90139-X
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1972LU09      Nucl.Phys. A197, 321 (1972)

C.C.Lu, L.C.Vaz, J.R.Huizenga

Spin Distribution of the Nuclear Level Density Near A = 60

NUCLEAR REACTIONS 56Fe(α, α'), 59Co(α, α'), 60Ni(α, α'), 62Ni(α, α'), 63Cu(α, α'), E=17.0 MeV; 60Ni(α, p), , 62Ni(α, p), E=16.5, 16.2 MeV; measured σ(Eα', θ), σ(Ep, θ). 56Fe, 59Co, 60,62Ni, 63,65Cu deduced spin cut-off factors. Isotopically separated targets.

doi: 10.1016/0375-9474(72)91014-7
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1972VA03      Phys.Rev. C5, 463 (1972)

L.C.Vaz, C.C.Lu, J.R.Huizenga

Isospin and the Bohr Independence Hypothesis

NUCLEAR REACTIONS 63Cu(p, p'), (p, α), E=12 MeV; 60Ni(α, α'), (α, p), E=16.6 MeV; measured σ(Ep'), σ(Eα), σ(Eα'), σ(Ep), σ ratios.

doi: 10.1103/PhysRevC.5.463
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2677.


1972VA31      Phys.Rev. C6, 1896 (1972)

L.C.Vaz, C.C.Lu, J.R.Huizenga

Level Densities from Analysis of Particle Spectra

doi: 10.1103/PhysRevC.6.1896
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