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Search: Author = A.Iwamoto

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2022AR04      Phys.Rev. C 105, 034604 (2022)

Y.Aritomo, A.Iwamoto, K.Nishio, M.Ohta

Fission mechanism inferred from nuclear shape fluctuation by the Langevin equation

NUCLEAR STRUCTURE 246,264Fm; calculated friction tensors and their eigenvalues in the ground states, first, and second saddles, Langevin trajectory contours, total kinetic energies (TKE) of fission fragments. 246,248,250,252,254,256,258,260,262,264Fm; calculated mass distribution of fission fragments (FFMD) at excitation energies of E*=7 MeV for the fermium isotopes; deduced trend for FFMD from mass-asymmetric to mass-symmetric distribution towards the heavier Fm isotopes. Langevin equations in the nuclear deformation space. Comparison with available experimental data.

doi: 10.1103/PhysRevC.105.034604
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2015MO03      Phys.Rev. C 91, 024310 (2015)

P.Moller, A.J.Sierk, T.Ichikawa, A.Iwamoto, M.Mumpower

Fission barriers at the end of the chart of the nuclides

NUCLEAR STRUCTURE Z=60-130, N=90-230, A=171-330; calculated fission-barrier heights, saddle-point energies for 5239 nuclei between the proton and neutron drip lines. 171Nd; calculated shape at saddle point. 298Hs; calculated potential energy surface contour in (ϵ2, γ) plane. Macroscopic-microscopic finite-range liquid-drop model with a 2002 set of macroscopic-model parameters.

doi: 10.1103/PhysRevC.91.024310
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2014MO17      Phys.Rev. C 90, 014601 (2014)

P.Moller, J.Randrup, A.Iwamoto, T.Ichikawa

Fission-fragment charge yields: Variation of odd-even staggering with element number, energy, and charge asymmetry

NUCLEAR REACTIONS 234U, 240Pu(n, F), E=thermal; 222,226,228Th, 234U(γ, F), E=11 MeV; analyzed magnitude of the odd-even staggering for fission-fragment charge-yield distributions; deduced total energies, potential energies, and excitation energies from saddle to scission at different locations in the five-dimensional deformation space; correlation of odd-even staggering with excitation energy.

doi: 10.1103/PhysRevC.90.014601
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2012IC01      Phys.Rev. C 86, 024610 (2012)

T.Ichikawa, A.Iwamoto, P.Moller, A.J.Sierk

Contrasting fission potential-energy structure of actinides and mercury isotopes

NUCLEAR STRUCTURE 178,180,182,184,186,188,190,192,194,196,198,200Hg, 236U; calculated potential-energy surfaces as function of quadrupole moment, saddle points, barrier heights and the ridge heights for fission. Asymmetric fission. Effect of shell structure of fission fragments. Macroscopic-microscopic approach, finite-range liquid-drop model (FRLDM).

doi: 10.1103/PhysRevC.86.024610
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2012IC03      Prog.Theor.Phys.(Kyoto), Suppl. 196, 269 (2012)

T.Ichikawa, K.Hagino, A.Iwamoto

Smooth Transition from Sudden to Adiabatic States in Deep-Subbarrier Fusion Reactions

NUCLEAR REACTIONS 64Ni(64Ni, X), 208Pb(16O, X), E(cm)<90 MeV; calculated fusion σ, average angular momenta of the compound nuclei; deduced adiabatic potential. Coupled-channel model calculations.

doi: 10.1143/PTPS.196.269
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2010AN13      Phys.Rev.Lett. 105, 252502 (2010)

A.N.Andreyev, J.Elseviers, M.Huyse, P.Van Duppen, S.Antalic, A.Barzakh, N.Bree, T.E.Cocolios, V.F.Comas, J.Diriken, D.Fedorov, V.Fedosseev, S.Franchoo, J.A.Heredia, O.Ivanov, U.Koster, B.A.Marsh, P.Van den Bergh, J.Van De Walle, K.Nishio, R.D.Page, N.Patronis, M.Seliverstov, I.Tsekhanovich, M.Venhart, S.Vermote, M.Veselsky, C.Wagemans, T.Ichikawa, A.Iwamoto, P.Moller, A.J.Sierk

New Type of Asymmetric Fission in Proton-Rich Nuclei

RADIOACTIVITY 180Tl(α), (β+), (EC) [from U(p, X), E=1.4 GeV]; measured fission fragments, Eα, Iα, X-rays. 180Hg; deduced asymetric fission fragment distribution, branching ratio for β-delayed fission.

doi: 10.1103/PhysRevLett.105.252502
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2009IC01      Phys.Rev. C 79, 014305 (2009)

T.Ichikawa, A.Iwamoto, P.Moller

Origin of the narrow, single peak in the fission-fragment mass distribution for 258Fm

RADIOACTIVITY 258Fm(SF); calculated potential energy, fragment charge distributions, inertial mass, mass-yield curves. Macroscopic-microscopic model.

doi: 10.1103/PhysRevC.79.014305
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2009IC04      Phys.Rev.Lett. 103, 202701 (2009)

T.Ichikawa, K.Hagino, A.Iwamoto

Signature of Smooth Transition from Sudden to Adiabatic States in Heavy-Ion Fusion Reactions at Deep Sub-Barrier Energies

NUCLEAR REACTIONS 208Pb(16O, X), 64Ni(64Ni, X), 58Ni(58Ni, X), E(cm)=60-105 MeV; analyzed fusion σ, S-factors, adiabatic potentials; deduced extension of the standard coupled-channels framework. Comparison with experiment.

doi: 10.1103/PhysRevLett.103.202701
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2009MO18      Phys.Rev. C 79, 064304 (2009)

P.Moller, A.J.Sierk, T.Ichikawa, A.Iwamoto, R.Bengtsson, H.Uhrenholt, S.Aberg

Heavy-element fission barriers

NUCLEAR STRUCTURE Z=90-99, A=225-256; calculated double-humped fission barrier energies, first and second saddle heights, and fission-isomer energies. Z=78-125, N=91-188, A=171-312; calculated fission barrier heights for 1585 nuclides. 232Th; calculated proton and neutron single particle levels at saddles for symmetric and asymmetric fission modes. 228Th, 236U, 243Am, 252Cf, 278Nh, 305125; calculated potential energy surfaces. 232Th, 238,239,241,242,243Am; calculated fission-barrier structures and Fermi-gas level density parameters. Macroscopic-microscopic finite-range liquid-drop model.

RADIOACTIVITY 236U, 232,240Pu, 222,224,230Cm, 224,230Cf, 226,252,258Fm, 277Cn(α)(SF); calculated α-decay and SF decay half-lives. 180Tl, 188Bi, 192,194,196At, 228Np, 232,234Am, 238,240Bk, 242,244,246,248Es, 246,248,250Md(EC); calculated Q-values and fission barriers in the daughter nuclides. Macroscopic-microscopic finite-range liquid-drop model calculations. Comparisons with experimental data.

doi: 10.1103/PhysRevC.79.064304
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2008MO13      At.Data Nucl.Data Tables 94, 758 (2008)

P.Moller, R.Bengtsson, B.G.Carlsson, P.Olivius, T.Ichikawa, H.Sagawa, A.Iwamoto

Axial and reflection asymmetry of the nuclear ground state

NUCLEAR STRUCTURE A=31-330; calculated nuclear ground state masses, deformation parameters; effect of axial and reflection asymmetry and of triaxiality; macroscopic-microscopic approach using folded-Yukawa single particle potential.

doi: 10.1016/j.adt.2008.05.002
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2007IC01      Phys.Rev. C 75, 057603 (2007)

T.Ichikawa, K.Hagino, A.Iwamoto

Existence of a one-body barrier revealed in deep subbarrier fusion

NUCLEAR REACTIONS 64Ni(64Ni, X), E(cm)< 110 MeV; calculated fusion cross section with a two step model.

doi: 10.1103/PhysRevC.75.057603
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2007IC02      Phys.Rev. C 75, 064612 (2007)

T.Ichikawa, K.Hagino, A.Iwamoto

Systematics of threshold incident energy for deep sub-barrier fusion hindrance

NUCLEAR REACTIONS 89Y, 90Zr, 92Zr(90Zr, X), 64Ni, 74Ge, 100Mo(64Ni, X), 89Y(60Ni, X), 58Ni, 60Ni, 64Ni, 74Ge(58Ni, X), 208Pb(50Ti, X), 48Ca(48Ca, X), 90Zr(40Ca, X), 89Y(34S, X), 89Y(32S, X), 58,62,64Ni, (28Si, X), 208Pb(19F, X), 208Pb, 144Sm, 76Ge, 16O(16O, X), 16O, 14N, 13C(12O, X), 12C(11O, X), 10B(10B, X), E< 200 MeV; calculated potential energy at the touching configuration for heavy-ion reactions using various potential models. Compared results to available data.

doi: 10.1103/PhysRevC.75.064612
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2005IC01      Phys.Rev. C 71, 044608 (2005)

T.Ichikawa, A.Iwamoto, P.Moller, A.J.Sierk

Barrier for cold-fusion production of superheavy elements

NUCLEAR REACTIONS 208Pb(48Ca, X), (50Ti, X), (54Cr, X), (58Fe, X), (62Ni, X), (64Ni, X), (70Zn, X), (74Ge, X), (76Ge, X), 209Bi(58Fe, X), (64Ni, X), (70Zn, X), E not given; calculated fusion barrier energies, deformation effects. Comparisons with data.

doi: 10.1103/PhysRevC.71.044608
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2005IC03      Phys.Rev. C 71, 067601 (2005)

T.Ichikawa, A.Iwamoto

Effect of charge polarization on the Coulomb barrier for cold-fusion reactions

NUCLEAR REACTIONS 208Pb(48Ca, X), (50Ti, X), (54Cr, X), (58Fe, X), (62Ni, X), (64Ni, X), (70Zn, X), (74Ge, X), (78Ge, X), 209Bi(58Fe, X), (64Ni, X), (70Zn, X), E not given; calculated Coulomb barrier height, effect of charge polarization.

doi: 10.1103/PhysRevC.71.067601
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2004IW02      Nucl.Phys. A738, 499 (2004)

A.Iwamoto, T.Ichikawa, P.Moller, A.J.Sierk

Cluster expression in fission and fusion in high-dimensional macroscopic-microscopic calculations

NUCLEAR STRUCTURE 272Ds; calculated fission potential energy surfaces.

NUCLEAR REACTIONS 208Pb(64Ni, X), E not given; calculated collision surface energy vs projectile deformation.

doi: 10.1016/j.nuclphysa.2004.04.096
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2004MO06      Phys.Rev.Lett. 92, 072501 (2004)

P.Moller, A.J.Sierk, A.Iwamoto

Five-Dimensional Fission-Barrier Calculations from 70Se to 252Cf

NUCLEAR STRUCTURE 70,76Se, 90,94,98Mo, 198Hg, 210,212Po, 228Ra, 228,230,232,234Th, 232,234,236,238,240U, 236,238,240,242,244,246Pu, 242,244,246,248,250Cm, 250,252Cf; calculated fission barrier parameters. Macroscopic-microscopic model, comparison with previous results.

doi: 10.1103/PhysRevLett.92.072501
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2004MO38      Prog.Theor.Phys.(Kyoto), Suppl. 154, 21 (2004)

P.Moller, A.J.Sierk, T.Ichikawa, A.Iwamoto

Fission and Fusion at the End of the Periodic System

NUCLEAR REACTIONS 208Pb(50Ti, X), (70Zn, X), E not given; calculated potential energy vs separation and deformation. 208Pb(48Ca, X), (50Ti, X), (54Cr, X), (58Fe, X), (62Ni, X), (64Ni, X), (70Zn, X), (74Ge, X), (76Ge, X), E not given; calculated fusion barrier energies; deduced microscopic and deformation effects.

2003CH84      Acta Phys.Hung.N.S. 18, 427 (2003)

S.Chikazumi, A.Iwamoto

First Order Phase Transition of Expanding Matter and Its Fragmentation

doi: 10.1556/APH.18.2003.2-4.53
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2003FU19      Phys.Rev.Lett. 91, 261101 (2003)

Y.Fujii, A.Iwamoto

Re/Os Constraint on the Time Variablility of the Fine-Structure Constant

RADIOACTIVITY 187Re(β-); analyzed decay rate, possible time dependence features.

doi: 10.1103/PhysRevLett.91.261101
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2003MA33      Chin.Phys.Lett. 20, 1238 (2003)

G.J.Mao, V.N.Kondratyev, A.Iwamoto, Z.X.Li, X.Z.Wu, W.Greiner, I.N.Mikhailov

Neutron Star Composition in Strong Magnetic Fields

doi: 10.1088/0256-307X/20/8/315
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2002CH27      Phys.Rev. C65, 067601 (2002)

S.Chikazumi, A.Iwamoto

First Order Phase Transition of Expanding Matter and Its Fragmentation

doi: 10.1103/PhysRevC.65.067601
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2002IW02      J.Nucl.Sci.Technol.(Tokyo) 39, 332 (2002)

A.Iwamoto, P.Moller, D.G.Madland, A.J.Sierk

Mass Division in Nuclear Fission and Isotope Effect

NUCLEAR STRUCTURE 256,258Fm; calculated fission saddle point shapes; deduced mass-symmetric and mass-asymmetric modes.

doi: 10.1080/18811248.2002.9715198
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2001CH06      Phys.Rev. C63, 024602 (2001)

S.Chikazumi, T.Maruyama, S.Chiba, K.Niita, A.Iwamoto

Quantum Molecular Dynamics Simulation of Expanding Nuclear Matter and Nuclear Multifragmentation

doi: 10.1103/PhysRevC.63.024602
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2001MO13      Nature(London) 409, 785 (2001)

P.Moller, D.G.Madland, A.J.Sierk, A.Iwamoto

Nuclear Fission Modes and Fragment Mass Asymmetries in a Five-Dimensional Deformation Space

NUCLEAR STRUCTURE 228Ra, 234U, 256,258Fm; calculated potential energy surfaces; deduced fission mode features. 220,222,224,226,228,230,232Th, 228,230,232,234,236,238,240U, 234,236,238,240,242,244,246Pu, 240,242,244,246,248,250,252Cm, 246,248,250,252,254,256,258Cf, 246,248,250,252,254,256,258Fm; calculated average fragment mass division in asymmetric fission. Five-dimensional shape-coordinate grid. Comparisons with data.

doi: 10.1038/35057204
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2000CH05      Phys.Lett. 476B, 273 (2000)

S.Chikazumi, T.Maruyama, K.Niita, A.Iwamoto

QMD Simulation of Expanding Nuclear Matter

doi: 10.1016/S0370-2693(00)00161-1
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2000FU01      Nucl.Phys. B573, 377 (2000)

Y.Fujii, A.Iwamoto, T.Fukahori, T.Ohnuki, M.Nakagawa, H.Hidaka, Y.Oura, P.Moller

The Nuclear Interaction at Oklo 2 Billion Years Ago

NUCLEAR REACTIONS 149Sm, 155,157Gd(n, X), E=thermal; calculated σ vs resonance parameters. Comparison with isotopic abundances from natural reactor.

doi: 10.1016/S0550-3213(00)00038-9
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2000KO17      Phys.Rev. C61, 044613 (2000)

V.N.Kondratyev, A.Bonasera, A.Iwamoto

Kinetics in Sub-Barrier Fusion of Spherical Nuclei

NUCLEAR REACTIONS 16O(16O, X), E=7-12 MeV; 58,64Ni(58Ni, X), 64Ni(64Ni, X), E=90-110 MeV; calculated fusion σ; deduced role of neck formation, deformation, nonlocality. Semiclassical transport theory.

doi: 10.1103/PhysRevC.61.044613
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2000MO08      Phys.Rev. C61, 047602 (2000)

P.Moller, A.Iwamoto

Realistic Fission Saddle-Point Shapes

NUCLEAR STRUCTURE 228Ra, 232Th, 240Pu, 258Fm; calculated fission saddle-point shapes.

doi: 10.1103/PhysRevC.61.047602
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1999IW04      Acta Phys.Hung.N.S. 10, 265 (1999)

A.Iwamoto, V.Kondratyev, A.Bonasera

Effect of Nucleon Exchange in Sub- and Above-Barrier Fusion

NUCLEAR REACTIONS 16O(16O, X), E=7-12 MeV; 58Ni(58Ni, X), E=90-110 MeV; calculated fusion σ; deduced reaction mechanism features. Vlasov equation, Feynman path integral method. Comparison with data.

1999MB10      Nucl.Phys. (Supplement) A654, 908c (1999)

T.Maruyama, K.Niita, K.Oyamatsu, T.Maruyama, S.Chiba, A.Iwamoto

Nuclear Matter Structure Studied with Quantum Molecular Dynamics

doi: 10.1016/S0375-9474(00)88570-X
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1999MO38      Acta Phys.Hung.N.S. 10, 241 (1999)

P.Moller, A.Iwamoto

Topology of Five-Dimensional, Million-Grid-Point Fission Potential-Energy Surfaces in the 3QS Parameterization

NUCLEAR STRUCTURE 236U, 256,258Fm; calculated fission saddle-point deformations. Macroscopic-microscopic method, five-dimensional grid.

1999WU01      Phys.Rev. C59, 215 (1999)

X.Wu, J.Gu, A.Iwamoto

Statistical Properties of Quasiparticle Spectra in Deformed Nuclei

NUCLEAR STRUCTURE Cf; calculated quasiparticle level spacing distributions vs deformation; deduced statistical properties, pairing effect.

doi: 10.1103/PhysRevC.59.215
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1998KO14      Phys.Lett. 423B, 1 (1998)

V.N.Kondratyev, A.Iwamoto

Nonlocality and Polarizability in the Fusion of Fermi Droplets

NUCLEAR REACTIONS 58Ni(58Ni, X), E ≈ 90-110 MeV; calculated fusion σ; deduced possible subbarrier enhancement mechanism. Semiclassical mean-field transport theory. Comparison with data.

doi: 10.1016/S0370-2693(98)00067-7
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1998MA04      Phys.Rev. C57, 655 (1998)

T.Maruyama, K.Niita, K.Oyamatsu, T.Maruyama, S.Chiba, A.Iwamoto

Quantum Molecular Dynamics Approach to the Nuclear Matter Below the Saturation Density

doi: 10.1103/PhysRevC.57.655
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1997BO02      Phys.Rev.Lett. 78, 187 (1997)

A.Bonasera, A.Iwamoto

Spontaneous Fission: A kinetic approach

RADIOACTIVITY 252Cf(SF); calculated density profile time evolution, fission fragment final kinetic energies. Semi-classical Vlasov equation.

doi: 10.1103/PhysRevLett.78.187
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1997BO31      Phys.Rev.Lett. 79, 3540 (1997)

A.Bonasera, A.Iwamoto

Bonasera and Iwamoto Reply:

doi: 10.1103/PhysRevLett.79.3540
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1997BO34      J.Phys.(London) G23, 1297 (1997)

A.Bonasera, V.N.Kondratyev, A.Iwamoto

Nuclear Dynamics Below the Coulomb Barrier

NUCLEAR REACTIONS 16O(16O, X), E not given; analyzed interaction potential vs separation; deduced dynamic polarization effects. Vlasov equation, Feynman path integral.

RADIOACTIVITY 258Fm(SF); calculated mass density vs time. Vlasov equation, Feynman path integral.

doi: 10.1088/0954-3899/23/10/018
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1997MA71      Prog.Theor.Phys.(Kyoto) 98, 87 (1997)

T.Maruyama, K.Niita, T.Maruyama, A.Iwamoto

On the IMF Multiplicity in Au + Au Reactions

NUCLEAR REACTIONS 197Au(197Au, X), E=100, 250, 400 MeV/nucleon; calculated intermediate mass fragment multiplicity distributions. Quantum molecular dynamics approach, evaporation model. Comparison with data.

doi: 10.1143/PTP.98.87
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1996CH10      Phys.Rev. C53, 1824 (1996)

S.Chiba, M.B.Chadwick, K.Niita, T.Maruyama, T.Maruyama, A.Iwamoto

Nucleon-Induced Preequilibrium Reactions in Terms of the Quantum Molecular Dynamics

NUCLEAR REACTIONS 58Ni(p, xp), E=120, 200 MeV; 90Zr(p, xp), (p, xn), E=160 MeV; 27Al(p, xp), (p, xn), E=90 MeV; 90Zr(p, xn), E=160 MeV; analyzed σ(θ, E(nucleon)); deduced multiple pre-equilibrium particle emission role. Quantum molecular dynamics approach.

doi: 10.1103/PhysRevC.53.1824
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1996CH15      Phys.Rev. C54, 285 (1996)

S.Chiba, O.Iwamoto, T.Fukahori, K.Niita, T.Maruyama, T.Maruyama, A.Iwamoto

Analysis of Proton-Induced Fragment Production Cross Sections by the Quantum Molecular Dynamics Plus Statistical Decay Model

NUCLEAR REACTIONS, ICPND 56Fe(p, n), (p, 3n2p), (p, 3n3p), (p, 5n4p), (p, 3n6p), (p, 4n6p), (p, 5n6p), (p, 6n8p), E=threshold-5 GeV; 27Al(p, n3p), (p, 3n3p), (p, 5n5p), (p, 11n10p), E ≤ 6 GeV; analyzed residuals production σ(E). Quantum molecular dynamics plus statistical decay models.

doi: 10.1103/PhysRevC.54.285
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1996IW01      Nucl.Phys. A605, 334 (1996)

A.Iwamoto, P.Moller

Nuclear Deformation and Sub-Barrier Fusion Cross Sections

NUCLEAR REACTIONS, ICPND 154Sm(32S, X), E(cm)=110-140 MeV; 154Sm(α, X), E(cm)=12-25 MeV; 154Sm(12C, X), E(cm)=42-60 MeV; 154Sm(16O, X), E(cm)=54-70 MeV; 154Sm(28Si, X), E(cm)=90-130 MeV; 154Sm(40Ar, X), E(cm)=110-150 MeV; 186W(16O, X), E(cm)=65-90 MeV; 238U(16O, X), E(cm)=75-115 MeV; calculated fusion σ(E), potential energy surfaces.

doi: 10.1016/0375-9474(96)00155-8
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1996MA02      Phys.Rev. C53, 297 (1996)

T.Maruyama, K.Niita, A.Iwamoto

Extension of Quantum Molecular Dynamics and Its Application to Heavy-Ion Collisions

NUCLEAR STRUCTURE 12C, 93Nb, 197Au; calculated density distribution, Gaussian widths.

NUCLEAR REACTIONS, ICPND 12C(12C, X), E=29 MeV/nucleon; 27Al(40Ar, X), E=44 MeV/nucleon; calculated σ vs fragment mass. 16O(16O, X), E ≤ 200 MeV; calculated fusion σ(E). Extended quantum molecular dynamics method.

doi: 10.1103/PhysRevC.53.297
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1995CH49      Phys.Rev. C52, 2800 (1995)

M.B.Chadwick, S.Chiba, K.Niita, T.Maruyama, A.Iwamoto

Quantum Molecular Dynamics and Multistep-Direct Analyses of Multiple Preequilibrium Emission

NUCLEAR REACTIONS 90Zr(p, xp), E=160 MeV; calculated angle-integrated σ for primary, multiple preequilibrium emission. Quantum molecular dynamics, multi-step direct analysis.

doi: 10.1103/PhysRevC.52.2800
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1995IW03      Nucl.Phys. A596, 329 (1995)

A.Iwamoto, P.Moller, J.R.Nix, H.Sagawa

Collisions of Deformed Nuclei: A path to the far side of the superheavy island

NUCLEAR REACTIONS, ICPND 154Sm(16O, X), E(cm) ≈ 55-70 MeV; calculated fusion σ(E), potential energy surface; deduced colliding nuclei deformation, orientation role.

RADIOACTIVITY 288Og(α) [from 186W(104Ru, X), E=362.3 MeV]; 300122, 301122(α) [from 186W(116Cd, X), E=398 MeV]; 293Lv(α) [from 248Cm(48Ca, X), E=212.56 MeV]; 294120(α) [from 186W(110Pd, X), E=376.2 MeV]; calculated Q(α).

doi: 10.1016/0375-9474(95)00394-0
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1995NI12      Phys.Rev. C52, 2620 (1995)

K.Niita, S.Chiba, T.Maruyama, T.Maruyama, H.Takada, T.Fukahori, Y.Nakahara, A.Iwamoto

Analysis of the (N, xN') Reactions by Quantum Molecular Dynamics Plus Statistical Decay Model

NUCLEAR REACTIONS 1n, 1H(p, X), E=0.5-3 GeV; calculated elastic, inelastic, total, pion production σ(E). 27Al(p, xp), (p, xπ-), E=3.17 GeV; 56Fe(p, xn), E=113, 597 MeV; 208Pb(p, xn), E=0.256-3 GeV; calculated σ(θ, E(particle)). Quantum molecular dynamics model.

doi: 10.1103/PhysRevC.52.2620
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1994IK01      Phys.Rev. C49, 968 (1994)

H.Ikezoe, Y.Nagame, I.Nishinaka, Y.Sugiyama, Y.Tomita, K.Ideno, S.Hamada, N.Shikazono, A.Iwamoto, T.Ohtsuki

Prescission and Postscission Charge Particle Emissions from the 19F + 159Tb Reaction

NUCLEAR REACTIONS 159Tb(19F, F), E=124.1, 159.1 MeV; measured fission (fragment)p-, (fragment)α-coin, prescission, postscission p-, α-multiplicities; deduced fission fragment temperatures. Statistical model.

doi: 10.1103/PhysRevC.49.968
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1994IW02      Z.Phys. A349, 265 (1994)


Multi-Dimensional Tunneling and Nuclear Fission Process

NUCLEAR STRUCTURE 236U(SF); calculated adiabatic path; deduced deviation from minimum action trajectory. Semi-classical treatment of tunneling through a multi-dimensional potential barrier.

doi: 10.1007/BF01288972
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1994MO13      Nucl.Phys. A575, 381 (1994); Erratum Nucl.Phys. A577, 833 (1994)

P.Moller, A.Iwamoto

Macroscopic Potential-Energy Surfaces for Arbitrarily Oriented, Deformed Heavy Ions

NUCLEAR REACTIONS 154Sm, 184W(16O, X), 24Mg(24Mg, X), 236U(α, X), 248Cm(48Ca, X), E not given; calculated potential energy surfaces related to light particle emission. Finite-range liquid drop model, arbitrarily oriented, deformed heavy ions.

doi: 10.1016/0375-9474(94)90197-X
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1992IK01      Phys.Rev. C46, 1922 (1992)

H.Ikezoe, N.Shikazono, Y.Nagame, Y.Sugiyama, Y.Tomita, K.Ideno, I.Nishinaka, B.J.Qi, H.J.Kim, A.Iwamoto, T.Ohtsuki

Charged Particle Multiplicities in Heavy-Ion-Induced Fission

NUCLEAR REACTIONS 197Au(19F, F), E=94-149.3 MeV; 181Ta, 197Au, 208Pb(19F, F), E=92-162.4 MeV; 197Au, 208Pb(28Si, F), E=147.2-194.1 MeV; measured pre-scission, post-scission charged particle multiplicity, fission, (fragment)(light charged particle)(θ); deduced fission dynamics. Statistical model.

doi: 10.1103/PhysRevC.46.1922
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE1648.

1991IW02      Z.Phys. A338, 303 (1991)

A.Iwamoto, R.Herrmann

Evaporation of Charged Particles from Highly Deformed Nucleus

NUCLEAR REACTIONS 197Au(19F, xα), E=137 MeV; calculated first-chance pre-fission α yields.

NUCLEAR STRUCTURE 186Hg, 216Ra, 256Cf; calculated fission saddle point deformation, α-decay barrier heights.

doi: 10.1007/BF01288194
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1990IK02      Phys.Rev. C42, 342 (1990)

H.Ikezoe, N.Shikazono, Y.Nagame, Y.Sugiyama, Y.Tomita, K.Ideno, A.Iwamoto, T.Ohtsuki

Pre-Scission 4He Multiplicity in the 19F + 197Au Reaction

NUCLEAR REACTIONS 19F(197Au, F), E=92-161 MeV; measured cross section, fission (fragment)α-coin; deduced pre-, post-scission α-multiplicities, emission barrier. Statistical model calculations.

doi: 10.1103/PhysRevC.42.342
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1990IK03      Phys.Rev. C42, R1187 (1990)

H.Ikezoe, N.Shikazono, Y.Nagame, Y.Sugiyama, Y.Tomita, K.Ideno, A.Iwamoto, T.Ohtsuki

Pre-Scission 1H and 4He Emissions in 16O + 197Au Reaction

NUCLEAR REACTIONS 197Au(16O, F), E=94-149.3 MeV; measured fission fragment (light particle)-coin; deduced emission barriers, pre-scission p, α multiplicities. Statistical model analysis.

doi: 10.1103/PhysRevC.42.R1187
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1989IW01      Phys.Lett. 219B, 176 (1989)

A.Iwamoto, N.Takigawa

Anomalous Enchancement of the Subbarrier Fusion Cross Section by Cooperative Shell and Deformation Effects

NUCLEAR REACTIONS 74Ge(74Ge, X), E(cm)=110-135 MeV; calculated fusion σ(E).

doi: 10.1016/0370-2693(89)90372-9
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1989KI15      Phys.Lett. 225B, 203 (1989)

T.Kindo, A.Iwamoto

Methods for the Calculation of the Fission Half-Life in the Multi-Dimensional Space

RADIOACTIVITY 236U, 212Po(SF); calculated SF T1/2. Invariant path techniques.

doi: 10.1016/0370-2693(89)90806-X
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1987IW02      Z.Phys. A326, 201 (1987)

A.Iwamoto, K.Harada

Enhancement of the Subbarrier Fusion Reaction due to Neck Formation

NUCLEAR REACTIONS, ICPND 40Ca(40Ca, X), E=45-65 MeV; 58Ni(58Ni, X), E=90-110 MeV; 64Ni(64Ni, X), E=85-110 MeV; 74Ge(74Ge, X), E=105-135 MeV; 80Se(80Se, X), E=125-150 MeV; 90Zr(90Zr, X), E=170-195 MeV; calculated fusion σ(E), potential energies. Neck formation, Krappe-Nix-Sierk model.

1987IW03      Phys.Rev. C35, 984 (1987)


Exciton-Model Approach to Fast-Particle Emission in Heavy-Ion Collisions

NUCLEAR REACTIONS 27Al, 90Zr, 197Au(16O, pX), E=310 MeV; analyzed σ(Ep, θp). Exciton model.

doi: 10.1103/PhysRevC.35.984
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1984IW04      Nucl.Phys. A419, 472 (1984)

A.Iwamoto, K.Harada

An Extension of the Generalized Exciton Model and Calculations of (p, p') and (p, α) Angular Distributions

NUCLEAR REACTIONS 197Au, 209Bi, 120Sn(p, p'), E=62 MeV; calculated σ(θ, Ep'). 120Sn(p, α), E=62 MeV; 209Bi(p, α), E=39, 62 MeV; calculated σ(θ, Eα). Generalized exciton model.

doi: 10.1016/0375-9474(84)90627-4
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1983SA27      Phys.Rev. C28, 1527 (1983)

K.Sato, A.Iwamoto, K.Harada

Pre-Equilibrium Emission of Light Composite Particles in the Framework of the Exciton Model

NUCLEAR REACTIONS 89Y, 120Sn, 197Au, 54Fe(p, p), (p, d), (p, t), (p, 3He), (p, α), E=62 MeV; 58Ni(p, t), (p, α), (p, 3He), E=90 MeV; calculated σ(Ep), σ(Ed), σ(Et), σ(E(3He)), σ(Eα); deduced composite particle emission mechanism. Exciton model.

doi: 10.1103/PhysRevC.28.1527
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1983YA07      Z.Phys. A313, 161 (1983)

S.Yamaji, A.Iwamoto

Friction Coefficients for Deep Inelastic Heavy-Ion Collisions

NUCLEAR REACTIONS 196Pt(64Zn, 64Zn), E not given; calculated radial-radial friction coefficient vs relative distance, temperature. 197Au(40Ar, X), E=288, 340 MeV; 197Au(40Ar, X), E=279, 388 MeV; 232Th(40Ar, X), E=279, 388 MeV; calculated mass diffusion coefficient vs temperature, relative distance. Linear response theory.

doi: 10.1007/BF01417223
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1982IW03      Phys.Rev. C26, 1821 (1982)

A.Iwamoto, K.Harada

Mechanism of Cluster Emission in Nucleon-Induced Preequilibrium Reactions

NUCLEAR REACTIONS 54Fe, 118,120Sn(p, α), E=29-62 MeV; calculated σ(E, Eα); deduced reaction mechanism. Exciton model, preequilibrium emission.

doi: 10.1103/PhysRevC.26.1821
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1981IW03      Z.Phys. A302, 149 (1981)

A.Iwamoto, K.Harada, S.Yamaji, S.Yoshida

Microscopic Calculation of Friction Coefficients for use in Heavy-Ion Reaction

NUCLEAR REACTIONS 196Pt(40Ar, X), E not given; calculated friction coefficient. Deep inelastic collision, linear response theory, two-center shell model.

doi: 10.1007/BF01413045
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1981YA09      Phys.Lett. 106B, 433 (1981)

S.Yamaji, A.Iwamoto, K.Harada, S.Yoshida

Microscopic Calculation of the Mass Diffusion Coefficient using Linear Response Theory

NUCLEAR REACTIONS 27Al(20Ne, X), E=120 MeV; 197Au(63Cu, X), E=365, 443 MeV; 209Bi(136Xe, X), E=1130 MeV; 165Ho, 209Bi(84Kr, X), E=714 MeV; 58Ni(16O, X), E=92 MeV; 50Ti(32S, X), E=131, 166 MeV; 197Au, 109Ag(40Ar, X), E=288 MeV; 197Au(40Ar, X), E=340 MeV; 232Th(40Ar, X), E=279, 388 MeV; 197Au(86Kr, X), E=620 MeV; calculated mass diffusion coefficient. Linear response theory.

doi: 10.1016/0370-2693(81)90250-1
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1977IW01      Phys.Lett. 68B, 35 (1977)

A.Iwamoto, K.Harada

On the Focussing Effect and the Large Energy Loss in the Quasi-Fission Reaction

NUCLEAR REACTIONS Bi(Kr, F), E=525, 600 MeV; Pb(Kr, F), E=494, 510, 718 MeV; Bi(Xe, F), E=1130 MeV; Sb(Ar, F), E=199, 300 MeV; calculated fission parameters, σ(θ).

doi: 10.1016/0370-2693(77)90028-4
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1976IW02      Progr.Theor.Phys. 55, 115 (1976)

A.Iwamoto, S.Yamaji, S.Suekane, K.Harada

Potential Energy Surfaces for the Fission of the Actinide Nuclei

NUCLEAR STRUCTURE 232,236,240,244,248Th, 232,234,236,238,240,242,246,250U, 236,240,244,248,252Pu, 238,242,246,250,254Cm, 240,244,248,250,252,256Cf, 242,246,250,254,258Fm, 244,248,252,256,260No; calculated potential energy surfaces for fission.

doi: 10.1143/PTP.55.115
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1974IW01      Progr.Theor.Phys. 51, 1617 (1974)

A.Iwamoto, S.Suekane, S.Yamaji, K.Harada

Asymmetric Fission of 236U

RADIOACTIVITY, Fission 236U(SF); calculated total potential energy surface for asymmetric fission.

doi: 10.1143/PTP.51.1617
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