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NSR database version of April 11, 2024.

Search: Author = Y.Aritomo

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2024AM03      Phys.Rev. C 109, 034603 (2024)

Sh.Amano, Y.Aritomo, M.Ohta

Effects of neck and nuclear orientations on the mass drift in heavy ion collisions

doi: 10.1103/PhysRevC.109.034603
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2023AM04      Phys.Rev. C 108, 014612 (2023)

S.Amano, Y.Aritomo, M.Ohta

Dynamical mechanism of fusion hindrance in heavy ion collisions

NUCLEAR REACTIONS 208Pb(48Ca, X), E(cm)=180 MeV; calculated fusion probabilities in collision process, one-dimensional fusion barrier dependence on initial angular momentum, mass distribution of fission fragments, trajectory distribution and time evolution. Investigated fusion hindrance caused by the formation of the neck. Concluded that the fusion hindrance comes from the formation of the inner barrier due to the early denecking process. Dynamical model based on multidimensional Langevin equations.

doi: 10.1103/PhysRevC.108.014612
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2023TA23      Phys.Rev. C 108, 054607 (2023)

S.Tanaka, N.Nishimura, F.Minato, Y.Aritomo

Postfission properties of uranium isotopes: A hybrid method with Langevin dynamics and the Hauser-Feshbach statistical model

doi: 10.1103/PhysRevC.108.054607
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2022AM06      Phys.Rev. C 106, 024610 (2022)

S.Amano, Y.Aritomo, M.Ohta

Modes of massive nucleon transfer appearing in quasifission processes for collisions of superheavy nuclei

NUCLEAR REACTIONS 249Bk(48Ca, X), E(cm)=213.05 MeV; calculated potential energy surfaces, fission fragments total kinetic energy distribution, trajectory distribution and time evolution, distribution of the deformation of fragments at scission point. Revealed existence of two quasifission modes arising from the different neck relaxation modes. Multidimensional dynamical model of nucleus-nucleus collisions based on the Langevin equations.

doi: 10.1103/PhysRevC.106.024610
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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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2022TA02      Phys.Rev. C 105, L021602 (2022)

S.Tanaka, K.Hirose, K.Nishio, K.R.Kean, H.Makii, R.Orlandi, K.Tsukada, Y.Aritomo

Angular momentum transfer in multinucleon transfer channels of 18O +237Np

NUCLEAR REACTIONS 237Np(18O, X)236Np/237Np/238Np/239Np/237Pu/238Pu/239Pu/240Pu/239Am/240Am/241Am/242Am, E=162 MeV; measured fission fragments, angular distribution of fission fragments; deduced angular anisotropy, average angular momenta. Beam from JAEA tandem accelerator.

doi: 10.1103/PhysRevC.105.L021602
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2020AM05      Bull.Rus.Acad.Sci.Phys. 84, 1034 (2020)

S.Amano, Y.Aritomo, Y.Miyamoto, S.Ishizaki, M.Okubayashi

Modeling of Nuclear Reactions with Langevin Calculations

NUCLEAR REACTIONS 186W(48Ti, X), E(cm)=187.87 MeV. analyzed available data; calculated mass angle distribution and mass distribution, yields.

doi: 10.3103/S1062873820080067
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2020AR11      Phys.Atomic Nuclei 83, 545 (2020)

Y.Aritomo, S.Amano, M.Okubayashi, B.Yanagi, K.Nishio, M.Ohta

Estimation of Synthesizing New Superheavy Elements Using Dynamical Model

NUCLEAR REACTIONS 208Pb(70Zn, X)278Cn, 250Pu(48Ca, X)298Fl, E not given; analyzed available data. 298,300,304Fl; deduced survival probabilities using the dynamical and statistical models.

doi: 10.1134/S1063778820040043
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2020VE07      Phys.Rev. C 102, 054610 (2020)

M.J.Vermeulen, K.Nishio, K.Hirose, K.R.Kean, H.Makii, R.Orlandi, K.Tsukada, I.Tsekhanovich, A.N.Andreyev, S.Ishizaki, M.Okubayashi, S.Tanaka, Y.Aritomo

Measurement of fission-fragment mass distributions in the multinucleon transfer channels of the 18O + 237Np reaction

NUCLEAR REACTIONS 237Np(18O, X)234U*/235U*/236U*/237U*/236Np*/237Np*/238Np*/239Np*/238Pu*/239Pu*/240Pu*/241Pu*/240Am*/241Am*/242Am*/243Am*/242Cm*/243Cm*/244Cm*/245Cm*/244Bk*/245Bk*/246Bk*, E=162.0 MeV from tandem accelerator facility of Japan Atomic Energy Agency (JAEA); measured fission fragments from the fission of reaction products U(A=234-237), Np(A=236-239), Pu(A=238-241), Am(A=240-243), Cm(A=242-244) and Bk(A=244-246) using ΔE-E silicon telescope to detect ejectiles, and four multiwire proportional counters, to detect fission fragments (FFs); deduced yields of fission fragments as a function of their mass and total excitation energy for each multi-nucleon transfer (MNT) channel, fission-fragment mass distributions as function of excitation energy of 7-70 MeV, most probable total excitation energy for each channel, light-fragment and heavy-fragment mass distributions. Comparison with Langevin theoretical calculations including the multichance fission (MCF) process of fission after neutron evaporation.

doi: 10.1103/PhysRevC.102.054610
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2680.


2019MI06      Phys.Rev. C 99, 051601 (2019)

Y.Miyamoto, Y.Aritomo, S.Tanaka, K.Hirose, K.Nishio

Origin of the dramatic change of fission mode in fermium isotopes investigated using Langevin equations

RADIOACTIVITY 250,252,254,256,258,260Fm(SF); calculated mass distributions, total kinetic energy (TKE) distributions, potential energy on the elongation-mass asymmetry plane, potential energy contours, and fission modes of fission fragments at low-excitation energies using Langevin equations of three-dimensional nuclear-shape parametrization. 237,238,239,240U, 239,240,241,242Np, 241,242,243Pu, 247,248,249,250Cm, 249,250,251,252Bk, 251,252,253,254Cf(SF); calculated fission-fragment mass distributions in the excitation-energy range of 10-20 MeV for four neck parameters using Langevin equations. Comparison with experimental data.

doi: 10.1103/PhysRevC.99.051601
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2019TA21      Phys.Rev. C 100, 064605 (2019)

S.Tanaka, Y.Aritomo, Y.Miyamoto, K.Hirose, K.Nishio

Effects of multichance fission on isotope dependence of fission fragment mass distributions at high energies

NUCLEAR REACTIONS 238U(18O, X)237U/238U/239U/240U/239Np/240Np/241Np/242Np/242Pu/243Pu/244Pu, E*=15, 25, 35, 45, 55 MeV; 237Np(18O, X)234U/235U/236U/236Np/237Np/238Np/238Pu/239Pu/240Pu/241Pu, E*=15, 25, 35, 45, 55 MeV; calculated fission fragment mass distributions (FFMD), fraction or probability of each fission chance using Langevin approach, and statistical model code GEF, including multichance fission (MCF). Comparison with experimental data from JAEA Tokai tandem facility. 234,235,236,237,238,239,240U, 236,237,238,239,240,241,242Np, 238,239,240,241,242,243,244Pu; calculated S(2n), fission barriers, mean number of neutron emission before fission using the GEF code.

doi: 10.1103/PhysRevC.100.064605
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2017HI10      Phys.Rev.Lett. 119, 222501 (2017)

K.Hirose, K.Nishio, S.Tanaka, R.Leguillon, H.Makii, I.Nishinaka, R.Orlandi, K.Tsukada, J.Smallcombe, M.J.Vermeulen, S.Chiba, Y.Aritomo, T.Ohtsuki, K.Nakano, S.Araki, Y.Watanabe, R.Tatsuzawa, N.Takaki, N.Tamura, S.Goto, I.Tsekhanovich, A.N.Andreyev

Role of Multichance Fission in the Description of Fission-Fragment Mass Distributions at High Energies

NUCLEAR REACTIONS 238U(18O, X)237U/238U/239U/240U/240Np/241Np/242Np/241Pu/242Pu/243Pu/244Pu, E=157.5 MeV; measured reaction products; deduced fragment yields.

doi: 10.1103/PhysRevLett.119.222501
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2661.


2016LE13      Phys.Lett. B 761, 125 (2016)

R.Leguillon, K.Nishio, K.Hirose, H.Makii, I.Nishinaka, R.Orlandi, K.Tsukada, J.Smallcombe, S.Chiba, Y.Aritomo, T.Ohtsuki, R.Tatsuzawa, N.Takaki, N.Tamura, S.Goto, I.Tsekhanovich, C.M.Petrache, A.N.Andreyev

Fission fragments mass distributions of nuclei populated by the multinucleon transfer channels of the 18O + 232Th reaction

NUCLEAR REACTIONS 232Th(18O, X)231Th/232Th/233Th/234Th/232Pa/233Pa/234Pa/235Pa/236Pa/234U/235U/236U/237U/238U, E=157 MeV; measured fission fragments; deduced fission yields.

doi: 10.1016/j.physletb.2016.08.010
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2014AR12      Phys.Rev. C 90, 054609 (2014)

Y.Aritomo, S.Chiba, F.Ivanyuk

Fission dynamics at low excitation energy

NUCLEAR REACTIONS 236U(n, F) at E*=20 MeV; calculated potential energy as function of deformation, mass distribution of fission fragments, trajectories of the fission process, nuclear shapes around the scission point, distribution of fission events as function of deformation at the scission point, total kinetic energy distribution (TKE) of fission events as function of deformation parameter. Fluctuation-dissipation model using Langevin equations for dynamics of fission process, within the two-center shell-model parameterization (TCSMP) and the shape characterized by five deformation parameters.

doi: 10.1103/PhysRevC.90.054609
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2014CH38      Nucl.Data Sheets 119, 229 (2014)

S.Chiba, K.Nishio, H.Makii, Y.Aritomo, I.Nishinaka, T.Ishii, K.Tsukada, M.Asai, K.Furutaka, S.Hashimoto, H.Koura, K.Ogata, T.Ohtsuki, T.Nagayama

Surrogate Reactions Research at JAEA/Tokyo Tech

NUCLEAR REACTIONS 235,238U(18O, F), E not given; measured reaction products; deduced fission fragment mass yields. 238U(18O, 16O), E not given; measured ejectiles, fission fragments; deduced fission fragment mass distribution, yields vs E*, unnormalized fission probability; calculated fission fragment mass distribution using multidimensional Langevin method. 239U(n, F), E=0.5-20 MeV; measured fission fragments; deduced fission σ vs neutron energy. 155Gd(18O, 16O), E not given; measured reaction products. 156Gd(n, γ), E=0.5-3.5 MeV; deduced σ using SRM (surrogate ratio method). Compared with ENDF/B/VII.1.

doi: 10.1016/j.nds.2014.08.063
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2014IV06      Phys.Rev. C 90, 054607 (2014)

F.A.Ivanyuk, S.Chiba, Y.Aritomo

Scission-point configuration within the two-center shell model shape parameterization

NUCLEAR REACTIONS 236U(n, F), E=thermal; calculated total deformation energy, shell component of scission point deformation energy, total energy (liquid drop plus shell correction) at the scission point, deformation energy before and after scission as function of elongation and heavy fragment mass number, mass distribution of fission fragments, excitation energy available for prompt neutron emission. 233Th, 236U, 240Pu, 246Cm(n, F), E=thermal; calculated total kinetic energies (TKEs), total excitation energies during the neck rupture. 232Th, 233,235,238U, 237Np, 239,240,241Pu, 241,243Am, 245Cm(n, F), E not given; calculated total neutron multiplicity. Optimal shape descriptions for fissioning systems. Two-center shell model parameterization for scission-point configuration. Comparison with experimental data.

doi: 10.1103/PhysRevC.90.054607
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2014NI16      Nucl.Data Sheets 119, 299 (2014)

K.Nishio, H.Ikezoe, S.Hofmann, D.Ackermann, Y.Aritomo, V.F.Comas, Ch.E.Dullmann, S.Heinz, J.A.Heredia, F.P.Hessberger, K.Hirose, J.Khuyagbaatar, B.Kindler, I.Kojouharov, B.Lommel, M.Makii, R.Mann, S.Mitsuoka, I.Nishinaka, T.Ohtsuki, S.Saro, M.Schadel, A.G.Popeko, A.Turler, Y.Wakabayashi, Y.Watanabe, A.Yakushev, A.Yeremin

Study of Heavy-ion Induced Fission for Heavy Element Synthesis

NUCLEAR REACTIONS 238U(30Si, F), (34S, F), E*=30-68 MeV;238U(36S, F), E(cm)=140-180 MeV; measured reaction products; calculated σ; deduced σ. 238U(30Si, xn), E(cm)=125-160 MeV;238U(34S, xn), E(cm)=140-180 MeV; measured reaction products; deduced σ; calculated σ.

doi: 10.1016/j.nds.2014.08.082
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2013AR07      Phys.Rev. C 88, 044614 (2013)

Y.Aritomo, S.Chiba

Fission process of nuclei at low excitation energies with a Langevin approach

RADIOACTIVITY 234U, 236U, 240Pu(SF); calculated potential energy surfaces, mass distribution of fission fragments (MDFF) for kinetic energy of 20 MeV for the fissioning nucleus. Dynamical model based on the fluctuation-dissipation theorem using Langevin equations. Comparison with experimental data.

NUCLEAR REACTIONS 236U(d, F), E=16.3, 20, 30, 40 MeV; calculated mass distribution of fission fragments (MDFF). Dynamical model based on the fluctuation-dissipation theorem using Langevin equations. Comparison with experimental data.

doi: 10.1103/PhysRevC.88.044614
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2012AR02      Phys.Rev. C 85, 044614 (2012)

Y.Aritomo, K.Hagino, K.Nishio, S.Chiba

Dynamical approach to heavy-ion induced fission using actinide target nuclei at energies around the Coulomb barrier

NUCLEAR REACTIONS 238U(34S, X), (36S, X), (30Si, X), E(cm)=130-180 MeV; analyzed experimental data for σ(E) and fission fragment mass distribution in heavy-ion induced fission. 238U(36S, X)274Hs*, E*=39.5 MeV; 238U(30Si, X)268Sg*, E*=35.5 MeV; calculated potential energy surfaces and nuclear shapes near scission point, probability distribution contour maps, time evolution of the probability distribution, Langevin trajectories. Coupled Channel calculations and a fluctuation-dissipation model for fusion-fission, quasifission and deep quasifission processes.

doi: 10.1103/PhysRevC.85.044614
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2012NI12      Phys.Rev. C 86, 034608 (2012)

K.Nishio, S.Mitsuoka, I.Nishinaka, H.Makii, Y.Wakabayashi, H.Ikezoe, K.Hirose, T.Ohtsuki, Y.Aritomo, S.Hofmann

Fusion probabilities in the reactions 40, 48Ca+238U at energies around the Coulomb barrier

NUCLEAR REACTIONS 238U(40Ca, X), (48Ca, X), E(cm)=180-248 MeV; measured fission fragment spectra, (fragment)(fragment)-coin, σ(θ), full momentum transfer fission σ, fission fragment σ and mass distribution, total kinetic energy (TKE); deduced fusion probabilities. Comparison with calculations using fluctuation-dissipation model using Langevin equations. Comparison with previous experimental studies.

doi: 10.1103/PhysRevC.86.034608
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2411.


2011AR11      Phys.Rev. C 84, 024602 (2011)

Y.Aritomo, S.Chiba, K.Nishio

Dynamical model of surrogate reactions

NUCLEAR REACTIONS 236,238U(18O, 16O)238U/240U, E(cm)=133.5 MeV; calculated potential energy surfaces for 240U and 256Fm, spin distributions, fragment mass distributions. Dynamical model of surrogate reactions employing Multidimensional Langevin equations. Comparison with experimental data.

doi: 10.1103/PhysRevC.84.024602
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2011CH55      Phys.Rev. C 84, 054602 (2011)

S.Chiba, O.Iwamoto, Y.Aritomo

Spin-dependent observables in surrogate reactions

NUCLEAR REACTIONS 237,239U(n, γ)238U*/240U*, E=0-5 MeV; calculated spectra of evaporated neutrons, multiplicity of γ rays, spectra of cascading γ rays, fission fragment mass distribution as function of the spin of the compound nucleus. Hauser-Feshbach theory , and Fluctuation-dissipation theorem. Surrogate ratio methods.

doi: 10.1103/PhysRevC.84.054602
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2010NI14      Phys.Rev. C 82, 024611 (2010)

K.Nishio, S.Hofmann, F.P.Hessberger, D.Ackermann, S.Antalic, Y.Aritomo, V.F.Comas, Ch.E.Dullmann, A.Gorshkov, R.Graeger, K.Hagino, S.Heinz, J.A.Heredia, K.Hirose, H.Ikezoe, J.Khuyagbaatar, B.Kindler, I.Kojouharov, B.Lommel, R.Mann, S.Mitsuoka, Y.Nagame, I.Nishinaka, T.Ohtsuki, A.G.Popeko, S.Saro, M.Schadel, A.Turler, Y.Watanabe, A.Yakushev, A.V.Yeremin

Nuclear orientation in the reaction 34S+238U and synthesis of the new isotope 268Hs

NUCLEAR REACTIONS 238U(34S, xn)267Hs/268Hs, E=148-170 MeV; measured evaporation residues and Eα, Eγ, x-rays, (fragment)α-, (fragment)γ-coin, production σ, fission σ(E), mass distribution of fission fragments as a function of energy. Comparison of fission σ(E) with calculations based on the three-dimensional Langevin equation and deformed target nuclei. Coupled-channel calculations for mass distributions. 268,269Sg, 272,273Hs, 269,271,272Mt, 274,275,276,277Sg, 273,275,276Rg, 278,279,280,281Cn; theoretical estimates of production rates in 243Am, 244Pu, 248Cm(34S, xn), (36S, xn) reactions.

RADIOACTIVITY 267,268Hs(α)[from 238U(34S, X), E=163.0 MeV]; 263Sg, 259Rf(α); 264Sg(SF); measured Eα, Eγ, x-rays, (fragment)α-, (fragment)γ-coin, half-lives; deduced Qα. Systematics of Qα values for even-even Z=104-114 and N=150-170 nuclei.

doi: 10.1103/PhysRevC.82.024611
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0736. Data from this article have been entered in the XUNDL database. For more information, click here.


2010NI18      Phys.Rev. C 82, 044604 (2010)

K.Nishio, H.Ikezoe, I.Nishinaka, S.Mitsuoka, K.Hirose, T.Ohtsuki, Y.Watanabe, Y.Aritomo, S.Hofmann

Evidence for quasifission in the sub-barrier reaction of 30Si+238U

NUCLEAR REACTIONS 238U(30Si, X), E=140.8, 145.3, 150.9, 156.5, 162.2, 167.8, 173.4, 179.0, 190.3 MeV; measured distribution for folding angle of fission fragments, σ for the full momentum transfer (FMT) fission, σ for evaporation residues of 263,264,265Sg, A=50-250 fragment mass distributions for full momentum transfer (FMT) fissions. Comparison with Langevin equation model and statistical model calculations.

doi: 10.1103/PhysRevC.82.044604
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2009AR17      Int.J.Mod.Phys. E18, 2145 (2009)

Y.Aritomo

Fusion-Fission dynamics in superheavy mass region

doi: 10.1142/S0218301309014457
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2009AR18      Phys.Rev. C 80, 064604 (2009)

Y.Aritomo

Analysis of dynamical processes using the mass distribution of fission fragments in heavy-ion reactions

NUCLEAR REACTIONS 238U(36Si, X), E(cm)=154.0, 166.0, 176.0 MeV; 238U(30Si, X), E(cm)=129.0, 134.0, 144.0 MeV; analyzed mass distributions of fission fragments, σ, and adiabatic potential energy surfaces using the dynamic model and the Langevin equation.

doi: 10.1103/PhysRevC.80.064604
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2007AR05      Phys.Rev. C 75, 024602 (2007)

Y.Aritomo

Possibility of synthesizing a doubly magic superheavy nucleus

NUCLEAR REACTIONS 152La(152La, X), 232Th(72Cr, X), 244Pu(60Ca, X), 258Fm(46Si, X), E* ≈ 10-80 MeV; calculated fusion probabilities, evaporation residue σ. 298,300,304Fl; calculated compound nucleus survival probabilities. Fluctuation-dissipation dynamics.

doi: 10.1103/PhysRevC.75.024602
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2007ZA12      Physics of Part.and Nuclei 38, 469 (2007)

V.Zagrebaev, A.Karpov, Y.Aritomo, M.Naumenko, W.Greiner

Potential energy of a heavy nuclear system in fusion-fission processes

doi: 10.1134/S106377960704003X
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2006AR03      Nucl.Phys. A764, 149 (2006)

Y.Aritomo, M.Ohta

Origin of the drastic decrease of fusion probability in superheavy mass region

NUCLEAR STRUCTURE 224Th, 232Pu, 240Cf, 256No, 267Sg, 280Ds, 292Fl, 297Og; calculated potential energy surface. Fluctuation-dissipation model.

NUCLEAR REACTIONS 208Pb(Ar, X), (Ca, X), (Ti, X), (Cr, X), (Fe, X), (Ni, X), (Zn, X), E not given; calculated fusion probability; deduced fusion-fission dynamics features. Fluctuation-dissipation model, comparison with data.

doi: 10.1016/j.nuclphysa.2005.09.008
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2006AR19      J.Phys.(London) G32, 2245 (2006)

Y.Aritomo, M.Ohta, F.Hanappe

Pre-scission neutron multiplicity associated with the dynamical process in the superheavy-mass region

NUCLEAR REACTIONS 208Pb, 244Pu(48Ca, F), E*=50 MeV; calculated prescission neutron multiplicities, fission fragment mass distributions. Fluctuation-dissipation dynamics.

doi: 10.1088/0954-3899/32/11/016
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2006AR21      Nucl.Phys. A780, 222 (2006)

Y.Aritomo

Fusion hindrance and roles of shell effects in superheavy mass region

NUCLEAR STRUCTURE 276,284,292Fl; calculated potential energy surfaces, shell correction energy.

NUCLEAR REACTIONS 208Pb(76Ge, X), E*=10-70 MeV; 244Pu(48Ca, X), E*=35-70 MeV; calculated fusion probability, fission fragment mass distributions, role of shell correction energy.

doi: 10.1016/j.nuclphysa.2006.09.018
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2006NA06      Int.J.Mod.Phys. E15, 311 (2006)

A.K.Nasirov, Y.Aritomo, A.Fukushima, M.Ohta, T.Wada, G.Giardina, G.Mandaglio, A.Muminov, R.K.Utamuratov

Role of the nuclear shell structure and orientation angles of deformed reactants in complete fusion

NUCLEAR REACTIONS 238U(16O, X), E=80-160 MeV; 154Sm(60Ni, X), E=240-330 MeV; calculated fusion and evaporation residue σ; deduced shell structure and orientation effects. Dinuclear system concept, Langevin calculations, comparison with data.

doi: 10.1142/S0218301306004144
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2005AR08      Nucl.Phys. A753, 152 (2005)

Y.Aritomo, M.Ohta

Trajectory analysis for fusion path in superheavy-mass region

NUCLEAR REACTIONS 208Pb, 244Pu(48Ca, X), E*=40, 50, 60 MeV; calculated fusion-fission trajectory in deformation space, time evolution features. 244Pu(48Ca, X), E*=40, 50, 60 MeV; calculated fission fragment mass distributions. Fluctuation-dissipation model.

doi: 10.1016/j.nuclphysa.2005.02.122
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2005AR22      Nucl.Phys. A759, 309 (2005)

Y.Aritomo, M.Ohta, T.Materna, F.Hanappe, O.Dorvaux, L.Stuttge

Analysis of fusion-fission dynamics by pre-scission neutron emission in 58Ni + 208Pb system

NUCLEAR REACTIONS 208Pb(58Ni, X), E*=185.9 MeV; analyzed pre-scission neutron multiplicity and fusion-fission trajectory in deformation space. Fluctuation-dissipation model.

doi: 10.1016/j.nuclphysa.2005.05.155
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2005NA29      Nucl.Phys. A759, 342 (2005)

A.Nasirov, A.Fukushima, Y.Toyoshima, Y.Aritomo, A.Muminov, S.Kalandarov, R.Utamuratov

The role of orientation of nucleus symmetry axis in fusion dynamics

NUCLEAR REACTIONS 238U(16O, X), E=80-160 MeV; 154Sm(60Ni, X), E=250-320 MeV; calculated capture, quasi-fission and fusion σ, entrance channel effects.Dinuclear system model analysis.

doi: 10.1016/j.nuclphysa.2005.05.152
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2004AR06      Int.J.Mod.Phys. E13, 301 (2004)

Y.Aritomo, M.Ohta, T.Materna, F.Hanappe, L.Stuttge

Dynamical calculation for fusion-fission process in superheavy mass region

NUCLEAR REACTIONS 208Pb(58Ni, X), E*=189.5 MeV; calculated pre-scission neutron multiplicities, quasi-fission and fusion-fission components.

doi: 10.1142/S0218301304002089
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2004AR10      Nucl.Phys. A734, 180 (2004)

Y.Aritomo, M.Ohta, T.Materna, F.Hanappe, L.Stuttge

Dynamics of fusion-fission process with neutron evaporation in superheavy mass region

NUCLEAR REACTIONS 208Pb(58Ni, X), E*=186 MeV; calculated pre-scission neutron multiplicity, fission trajectory features.

doi: 10.1016/j.nuclphysa.2004.01.029
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2004AR16      Nucl.Phys. A738, 221 (2004)

Y.Aritomo, M.Ohta, T.Materna, F.Hanappe, L.Stuttge

Analysis of fusion-fission dynamics in superheavy mass region by pre-scission neutron multiplicities

NUCLEAR STRUCTURE 292Fl; calculated potential energy surface; deduced decay paths. Fluctuation-dissipation model.

NUCLEAR REACTIONS 208Pb(58Ni, X), E*=189.5 MeV; 208Pb, 244Pu(48Ca, X), E*=40 MeV; analyzed pre-scission neutron multiplicities, fission fragment mass distributions; deduced fusion-fission dynamics features. Fluctuation-dissipation model.

doi: 10.1016/j.nuclphysa.2004.04.035
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2004AR20      Prog.Theor.Phys.(Kyoto), Suppl. 154, 449 (2004)

Y.Aritomo, M.Ohta, T.Materna, F.Hanappe, L.Stuttge

Problems of Dynamical Calculation for Synthesis of Superheavy Elements

NUCLEAR REACTIONS 208Pb, 244Pu(48Ca, X), E* ≈ 35 MeV; calculated potential energy surfaces, fusion-fission σ, fission fragment mass distributions, pre-scission neutron multiplicities. Dynamical approach, sensitivity to parameters discussed.

doi: 10.1143/PTPS.154.449
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2004AR24      Acta Phys.Hung.N.S. 19, 85 (2004)

Y.Aritomo, M.Ohta

Analysis of Fusion-Fission Process with Neutron Evaporation in Superheavy Mass Region

doi: 10.1556/APH.19.2004.1-2.12
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2004AR25      Nucl.Phys. A744, 3 (2004)

Y.Aritomo, M.Ohta

Dynamical calculation for fusion-fission probability in superheavy mass region, where mass symmetric fission events originate

NUCLEAR REACTIONS 208Pb, 244Pu(48Ca, X), E* ≈ 25-50 MeV; calculated potential energy surfaces, fusion-fission σ, fission fragment mass distributions; deduced reaction mechanism features. Dynamical approach.

doi: 10.1016/j.nuclphysa.2004.08.009
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2004MA16      Int.J.Mod.Phys. E13, 285 (2004)

T.Materna, V.Bouchat, V.Kinnard, F.Hanappe, O.Dorvaux, C.Schmitt, L.Stuttge, K.Siwek-Wilczynska, Y.Aritomo, A.Bogatchev, E.Prokhorova, M.Ohta

Tracking dissipation in capture reactions

NUCLEAR REACTIONS 98Mo(28Si, X), E=204 MeV; 208Pb(58Ni, X), E*=186 MeV; 232Th(40Ca, X), E*=166 MeV; calculated pre- and post-scission neutron multiplicities, dissipation effects. Backtracing technique.

doi: 10.1142/S0218301304002065
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2004MA30      Nucl.Phys. A734, 184 (2004)

T.Materna, Y.Aritomo, N.Amar, A.Bogatchev, V.Bouchat, O.Dorvaux, G.Giardina, S.Grevy, F.Hanappe, I.Itkis, M.Itkis, M.Jandel, G.Kniajeva, J.Kliman, E.Kozulin, N.Kondratiev, L.Krupa, J.Peter, E.Prokhorova, I.Pokrovsky, C.Schmitt, L.Stuttge, V.Voskresensky

Capture and dissipation in the superheavy region

NUCLEAR REACTIONS 208Pb(48Ca, X), E=240 MeV; 244Pu(48Ca, X), E=244 MeV; measured pre-scission neutron multiplicity distributions. Backtracing analysis.

doi: 10.1016/j.nuclphysa.2004.01.030
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2004MA69      Prog.Theor.Phys.(Kyoto), Suppl. 154, 442 (2004)

T.Materna, F.Hanappe, Y.Aritomo, L.Stuttge, O.Dorvaux, C.Schmitt, M.Ohta

Tracking Dissipation in Capture Reactions

NUCLEAR REACTIONS 98Mo(28Si, X), E=204 MeV; 232Th(40Ca, X), E*=166 MeV; 208Pb(58Ni, X), E*=186 MeV; analyzed pre- and post-scission neutron multiplicities; deduced dissipation effects. Backtracing procedure.

doi: 10.1143/PTPS.154.442
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2004OH12      Acta Phys.Hung.N.S. 19, 61 (2004)

M.Ohta, Y.Aritomo, K.Hashizume

On Evaporation Residue Cross Sections Producing Nuclei with Z = 104-120

doi: 10.1556/APH.19.2004.1-2.9
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2003AR10      Yad.Fiz. 66, 1141 (2003); Phys.Atomic Nuclei 66, 1105 (2003)

Y.Aritomo, M.Ohta

Analysis of Fusion-Fission Process with Neutron Evaporation in Superheavy Mass Region

NUCLEAR REACTIONS 208Pb(48Ca, X), (52Cr, X), (64Ni, X), E*=32-101 MeV; 244Pu(48Ca, X), E*=37 MeV; calculated fission fragment mass distributions, kinetic energies. 244Pu, 249Cf(48Ca, xn), E*=20-50 MeV; calculated σ. 244Pu(48Ca, X), E*=33 MeV; calculated prescission neutron multiplicity. Fluctuation-dissipation dynamics.

doi: 10.1134/1.1586423
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2003MA30      Yad.Fiz. 66, 1204 (2003); Phys.Atomic Nuclei 66, 1168 (2003)

T.Materna, C.Schmitt, Y.Aritomo, J.Bartel, B.Benoit, A.A.Bogatchev, E.de Goes Brennand, O.Dorvaux, G.Giardina, F.Hanappe, M.G.Itkis, I.M.Itkis, J.Kliman, G.N.Kniajeva, N.A.Kondratiev, E.M.Kozulin, L.Krupa, Yu.Ts.Oganessian, I.V.Pokrovsky, E.V.Prokhorova, N.Rowley, K.Siwek-Wilczynska, L.Stuttge

Tracking Dissipation in Capture Reactions

NUCLEAR REACTIONS 98Mo(28Si, X), E=204 MeV; 208Pb(58Ni, X), E=232Th(40Ca, X), E=166 MeV; analyzed pre- and post-scission neutron multiplicities, correlations. 209Bi(18O, F), E*=26 MeV; analyzed fission fragment mass distribution. Backtracking analysis method.

doi: 10.1134/1.1586432
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2003OH02      Yad.Fiz. 66, 1062 (2003); Phys.Atomic Nuclei 66, 1026 (2003)

M.Ohta, Y.Aritomo

An Idea for Predicting the Evaporation Residue Cross Section in Superheavy Mass Region

NUCLEAR REACTIONS 238U, 244Pu, 243Am, 248Cm, 249Bk, 248,249Cf(18O, xn), (19F, xn), (22Ne, xn), (23Na, xn), (26Mg, xn), (27Al, xn), (30Si, xn), (31P, xn), (34S, xn), (37Cl, xn), (40Ar, xn), (41K, xn), (48Ca, xn), (45Sc, xn), (50Ti, xn), (50V, xn), (54Cr, xn), (55Mn, xn), (58Fe, xn), E* ≈ 35 MeV; 248,249,250,251,252Cf(48Ca, xn), E* ≈ 30 MeV; calculated evaporation residue formation σ. Phenomenological approach, comparisons with data.

doi: 10.1134/1.1586414
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2002AR24      Prog.Theor.Phys.(Kyoto), Suppl. 146, 503 (2002)

Y.Aritomo

Fusion-Fission Process of Superheavy Elements with Fluctuation-Dissipation Model

NUCLEAR REACTIONS 244Pu, 248Cm(48Ca, X), E* ≈ 20-50 MeV; calculated fusion and evaporation residue σ. Fluctuation-dissipation model.

doi: 10.1143/PTPS.146.503
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2002AR25      J.Nucl.Radiochem.Sci. 3, No 1, 17 (2002)

Y.Aritomo

Fusion Mechanism in Superheavy Mass Region

NUCLEAR REACTIONS 244Pu(48Ca, X), E*=25-50 MeV; analyzed fusion σ, fission fragment mass distribution.


2002ZA01      Phys.Rev. C65, 014607 (2002)

V.I.Zagrebaev, Y.Aritomo, M.G.Itkis, Yu.Ts.Oganessian, M.Ohta

Synthesis of Superheavy Nuclei: How accurately can we describe it and calculate the cross sections ?

NUCLEAR REACTIONS 208Pb(16O, xn), E*=14-45 MeV; 236U(12C, xn), E*=26-65 MeV; 172Yb, 206,208Pb, 244Pu(48Ca, xn), E*=12-60 MeV; 136Xe(86Kr, xn), E*=15-60 MeV; 124Sn(92Zr, xn), (96Zr, xn), E*=10-60 MeV; calculated, analyzed fusion and evaporation residue σ. Implications for synthesis of superheavy elements discussed.

doi: 10.1103/PhysRevC.65.014607
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1999AR04      Phys.Rev. C59, 796 (1999)

Y.Aritomo, T.Wada, M.Ohta, Y.Abe

Fluctuation-Dissipation Model for Synthesis of Superheavy Elements

NUCLEAR STRUCTURE 268No, 276Rf, 282Sg, 286Hs, 292Ds, 294Cn, 298Fl, 302Lv; calculated fission potential energy curves, evaporation residue cross sections vs excitation energy, fission barrier height. Fluctuation-dissipation model.

doi: 10.1103/PhysRevC.59.796
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1999OH10      Acta Phys.Hung.N.S. 10, 253 (1999)

M.Ohta, K.Okazaki, T.Wada, Y.Aritomo, Y.Abe

Favorable Combination for the Synthesis of Superheavy Elements

NUCLEAR REACTIONS 223At(75Cu, X), 231Ra(67Fe, X), 238Pa(60V, X), 246Pu(52Ca, X), 253Bk(45Cl, X), 217At(73Cu, X), 224Ra(66Fe, X), 232Pa(58V, X), 239Pu(51Ca, X), 247Bk(43Cl, X), E*=25-50 MeV; calculated compound nucleus formation probability, evaporation residue σ.


1999WA28      Nucl.Phys. (Supplement) A654, 888c (1999)

T.Wada, Y.Aritomo, T.Tokuda, K.Okazaki, M.Ohta, Y.Abe

Multi-Dimensional Fluctuation-Dissipation Dynamics of the Synthesis of Superheavy Elements

NUCLEAR REACTIONS 149La(149La, X), E*=10-50 MeV; calculated evaporation residue excitation function. Fluctuation-dissipation dynamics, mass asymmetric channels also discussed.

doi: 10.1016/S0375-9474(00)88566-8
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1997AB38      J.Phys.(London) G23, 1275 (1997)

Y.Abe, Y.Aritomo, T.Wada, M.Ohta

A New Mechanism for Synthesis of Superheavy Elements

NUCLEAR STRUCTURE 298Fl; calculated potential vs collective degree of freedom, time, shell-correction energy vs temperature, other superheavy residue production related features.

doi: 10.1088/0954-3899/23/10/015
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1997AR06      Phys.Rev. C55, R1011 (1997)

Y.Aritomo, T.Wada, M.Ohta, Y.Abe

Diffusion Mechanism for Synthesis of Superheavy Elements

NUCLEAR REACTIONS 149La(149La, X), E not given; calculated evaporation residue σ vs excitation. Smoluchowski equation, finite-range droplet model potential; temperature dependent shell correction energy, superheavy elements.

doi: 10.1103/PhysRevC.55.R1011
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1997WA08      Nucl.Phys. A616, 446c (1997)

T.Wada, Y.Aritomo, T.Tokuda, M.Ohta, Y.Abe

Dynamics of the Superheavy Element Synthesis with a Diffusion Model

NUCLEAR REACTIONS 145La(145La, X), 147La(147La, X), 148La(148La, X), 149La(149La, X), E not given; calculated evaporation residue σ vs initial excitation energy for 290114, 294114, 296114, 298114 compound nuclei, formation, survival probabilities; deduced isotope dependence, superheavy element synthesis dynamics related features. Diffusion model.

doi: 10.1016/S0375-9474(97)00116-4
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