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NSR database version of May 24, 2024.

Search: Author = S.Ohkubo

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2024OH01      Phys.Rev. C 109, 034618 (2024)

S.Ohkubo

Farside-dominant quasinuclear rainbow in refractive α + α scattering

doi: 10.1103/PhysRevC.109.034618
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2023OH01      Phys.Rev. C 107, 034317 (2023)

S.Ohkubo, Y.Hirabayashi

α + 92Zr cluster structure in 96Mo

NUCLEAR REACTIONS 90,91,92,94Zr(α, α), E=21-120 MeV; calcu92Zr(α, α), E=10-25 MeV; calculated phase shifts. Double folding model. Comparison to experimental data.

NUCLEAR STRUCTURE 96Mo; calculated levels, J, π, B(E2), rms radii. Calculations are based on α+92Zr cluster model with the double folding potential. Discussed the effect of α clustering in 96Mo on half-life of 96Zr 0νββ-decay. Comparison to experimental data.

doi: 10.1103/PhysRevC.107.034317
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2022OH02      Phys.Rev. C 106, 034324 (2022)

S.Ohkubo

Supersolidity of α cluster structure in 40Ca

NUCLEAR STRUCTURE 40Ca; calculated levels, J, π, eigenfunction for the ground state, Bogoliubov-de Gennes (BdG) and zero-mode wave functions, condensation rate dependence of the energy levels using spatially localized Brink α-cluster model in the generator coordinate method (GCM), and field theoretical superfluid cluster model (SCM) for condensation aspects of the α-cluster structure. Comparison with available experimental data. Discussed nature of the mysterious 0+ state at the lowest excitation energy in 40Ca in terms of Nambu-Goldstone zero mode.

doi: 10.1103/PhysRevC.106.034324
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2021HI14      Prog.Theor.Exp.Phys. 2021, 113D02 (2021)

Y.Hirabayashi, S.Ohkubo

Existence of core excited 8Be* = α + α8 cluster structure in α + α scattering

NUCLEAR STRUCTURE 8Be; analyzed available data; deduced α+α cluster structure at the highly excited energy using the coupled-channel calculations.

doi: 10.1093/ptep/ptab126
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2021OH02      Phys.Rev. C 104, 054310 (2021)

S.Ohkubo

Evidence of a higher nodal band α + 44Ca cluster state in fusion reactions and α clustering in 48Ti

NUCLEAR REACTIONS 44Ca(α, α), E=18, 24.1 MeV; calculated σ(θ, E) distribution using global optical potential, and compared with experimental data. 44Ca(α, X), E=9.5-18 MeV; calculated fusion σ(E), phase shifts and compared with experimental σ(E) data.

NUCLEAR STRUCTURE 48Ti; calculated levels, J, π, bands, B(E2) with respect to the α threshold calculated with the potentials of 181 MeV and 171 MeV, and compared with experimental data; deduced evidence for α cluster structure of 48Ti. Relevance to evaluating half-life of the neutrinoless double-β decay (0νββ) of 48Ca.

doi: 10.1103/PhysRevC.104.054310
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2020OH02      Phys.Rev. C 101, 041301 (2020)

S.Ohkubo

Existence of higher nodal band states with α + 48Ca cluster structure in 52Ti

NUCLEAR REACTIONS 48Ca(α, α), E=18, 29, 40.7, 45.9, 49.5, 65.6, 100 MeV; calculated σ(E, θ) using the optical model potentials, and compared with experimental data; deduced cluster structure in 52Ti by studying the nuclear rainbows at high energies, the Airy structure of the pre-rainbows at intermediate energies.

NUCLEAR STRUCTURE 52Ti; calculated levels, J, π, 3α-cluster states, intercluster rms radii, B(E2), resonance energies and widths of N=14 band states, and radial α+48Ca potential. Discussion of α+48Ca cluster structure in N=14 higher nodal band states.

doi: 10.1103/PhysRevC.101.041301
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2020OH03      Prog.Theor.Exp.Phys. 2020, 041D01 (2020)

S.Ohkubo, J.Takahashi, Y.Yamanaka

Supersolidity of the α cluster structure in the nucleus 12C

NUCLEAR STRUCTURE 12C; calculated structure parameters; deduced that the crystalline cluster picture and the nonlocalized cluster picture can be reconciled by noticing that they are a manifestation of supersolidity with properties of both crystallinity and superfluidity using a superfluid α cluster model based on effective field theory.

doi: 10.1093/ptep/ptaa043
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2019PE14      Phys.Rev. C 100, 024312 (2019)

P.Petkov, C.Muller-Gatermann, D.Werner, A.Dewald, A.Blazhev, C.Fransen, J.Jolie, S.Ohkubo, K.O.Zell

New lifetime measurements for the lowest quadrupole states in 20, 22Ne and possible explanations of the high collectivity of the depopulating E2 transitions

NUCLEAR REACTIONS 9Be, Mg(16O, X)20Ne, E=30, 33, 36, 38 MeV; 9Be, Mg(18O, X)22Ne, E=33 MeV; measured Eγ, Iγ, γγ-coin, stopping powers, level half-lives by DSAM and line-shape analysis using an array of twelve HPGe detectors, and Cologne coincidence plunger set up at the tandem accelerator of the University of Cologne. 20,22Ne; deduced levels, B(E2). Comparison with shell-model and configuration-mixing calculations, and with previous experimental data. Discussed angular momentum dependence of the B(E2) transition strengths between the yrast states.

doi: 10.1103/PhysRevC.100.024312
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2018KA41      Phys.Rev. C 98, 044303 (2018)

R.Katsuragi, Y.Kazama, J.Takahashi, Y.Nakamura, Y.Yamanaka, S.Ohkubo

Bose-Einstein condensation of α-clusters and new soft mode in 12C-52Fe 4N nuclei in a field-theoretical superfluid cluster model

NUCLEAR STRUCTURE 12C, 16O, 20Ne, 24Mg, 28Si, 32S, 36Ar, 40Ca, 44Ti, 48Cr, 52Fe; calculated levels for N=3-13 α clusters, confining potential per α-cluster, and Bogoliubov-de Gennes wave functions at various condensation rates, and B(E2) for 12C using field-theoretical superfluid cluster model. Bose-Einstein condensation (BEC) of α clusters in light and medium-heavy 4N nuclei. Comparison with available experimental values.

doi: 10.1103/PhysRevC.98.044303
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2017OH02      Phys.Rev. C 95, 044002 (2017)

S.Ohkubo

Luneburg-lens-like structural Pauli attractive core of the nuclear force at short distances

doi: 10.1103/PhysRevC.95.044002
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2017OH04      Phys.Rev. C 96, 024607 (2017)

S.Ohkubo, Y.Hirabayashi, A.A.Ogloblin

Existence of inelastic supernumerary nuclear rainbow in 16O + 12C scattering

NUCLEAR REACTIONS 12C(16O, 16O), (16O, 16O'), (16O, 12C), E=124, 170, 180, 181, 200 MeV; analyzed σ(θ, E) data using coupled channels method with an extended double folding potential, and wavefunctions for 12C and 16O from microscopic α cluster model and a finite-range density-dependent nucleon-nucleon force; deduced positions of the Airy and A1 minima, and existence of a supernumerary bow in inelastic scattering. Comparison with pattern of meteorological rainbows.

doi: 10.1103/PhysRevC.96.024607
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2016NA22      Phys.Rev. C 94, 014314 (2016), Erratum Phys.Rev. C 98, 049901 (2018)

Y.Nakamura, J.Takahashi, Y.Yamanaka, S.Ohkubo

Effective field theory of Bose-Einstein condensation of α clusters and Nambu-Goldstone-Higgs states in 12C

NUCLEAR STRUCTURE 12C; calculated levels, J, π, B(E2) of α-cluster structure above the α-condensate Hoyle state. Discussed emergence of the Nambu-Goldstone-Higgs (NGH) states. Quantum field theory of Bose-Einstein condensation for α clusters. Comparison with available experimental data.

doi: 10.1103/PhysRevC.94.014314
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2016OH02      Phys.Rev. C 93, 041303 (2016)

S.Ohkubo

Luneburg-lens-like universal structural Pauli attraction in nucleus-nucleus interactions: Origin of emergence of cluster structures and nuclear rainbows

NUCLEAR REACTIONS 40Ca(α, α), E=61 MeV; 16O(α, α), E=49.5 MeV; 4He(α, α), E=wide range; 16O(16O, 16O), E=350 MeV; analyzed σ(θ) data. Global nuclear potential and corresponding Luneburg lens potential. Airy structure of nuclear rainbow, and cluster structures. Evidence for existence of a Luneburg-lens-like universal structural Pauli attraction in the internal region of nucleus-nucleus interaction.

doi: 10.1103/PhysRevC.93.041303
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2016OH04      Phys.Rev. C 94, 034601 (2016)

S.Ohkubo, Y.Hirabayashi

Evidence for a dynamically refracted primary bow in weakly bound 9Be rainbow scattering from 16O

NUCLEAR REACTIONS 16O(9Be, 9Be), E=74.25, 157.7 MeV; calculated σ(θ) in a single channel, σ(θ) with coupling to the 5/2- and 7/2- states in 9Be, energy evolution of the Airy minima for E(9Be)=74.25, 90.0, 112.5, 135.0, 17.7 MeV; deduced evidence for the existence of a primary bow refracted dynamically by coupling to the excited states of a weakly bound 9Be nucleus. Coupled channel (CC) method with an extended double folding (EDF) model. Comparison with experimental data for E(9Be)=74.25 and 157.7 MeV.

doi: 10.1103/PhysRevC.94.034601
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2015MA12      Phys.Rev. C 91, 024616 (2015)

R.S.Mackintosh, Y.Hirabayashi, S.Ohkubo

Emergence of a secondary rainbow and the dynamical polarization potential for 16O on 12C at 330 MeV

NUCLEAR REACTIONS 12C(16O, 16O), E≈300 MeV; analyzed dynamic polarization potential (DPP) and secondary rainbow effect using S-matrix to potential, SL to V(r) inversion, and coupled channel calculations; deduced effect of direct coupling between the collective states of 12C and 16O. Comparison with experimental data.

doi: 10.1103/PhysRevC.91.024616
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2015OH01      Phys.Rev. C 92, 024624 (2015)

S.Ohkubo, Y.Hirabayashi

Airy structure in 16O + 14C nuclear rainbow scattering

NUCLEAR REACTIONS 14C(16O, 16O), E=116, 132, 158, 160, 180, 200, 220, 240, 260, 281, 382.2 MeV; calculated σ(θ, E); deduced energy evolution of the Airy structure of nuclear rainbow and σ(θ) distribution, Airy minima using extended double-folding (EDF) model. Comparison with experimental data.

doi: 10.1103/PhysRevC.92.024624
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2015OH02      Phys.Rev. C 92, 051601 (2015)

S.Ohkubo, Y.Hirabayashi, A.A.Ogloblin

Further evidence for a dynamically generated secondary bow in 13C + 12C rainbow scattering

NUCLEAR REACTIONS 12C(13C, 13C'), E=200, 250, 260, 330 MeV; 12C(16O, 16O'), E=330 MeV; calculated σ(θ) distributions with coupling to first 2+ and 3- states in 12C and 16O, energy evolution of the Airy structure in σ(θ, E) distributions in 13C+12C reaction; deduced existence of a secondary bow in nuclear rainbow scattering. Coupled channels (CC) method with extended double-folding (EDF) model. Comparison with experimental data.

doi: 10.1103/PhysRevC.92.051601
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2014OH01      Phys.Rev. C 89, 051601 (2014)

S.Ohkubo, Y.Hirabayashi

Evidence for a secondary bow in Newton's zero-order nuclear rainbow

NUCLEAR REACTIONS 16O(12C, 12C), E=200-608 MeV; analyzed experimental σ(θ) data by coupled-channel (CC) method, and by extended double folding (EDF) potential using realistic wave functions for 16O and 12C; deduced evidence for a secondary bow in Newton's zero-order nuclear rainbow scattering. Airy minimum. Discussed contribution of transfer reaction channels.

doi: 10.1103/PhysRevC.89.051601
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2014OH02      Phys.Rev. C 89, 061601 (2014)

S.Ohkubo, Y.Hirabayashi

Similarity between nuclear rainbow and meteorological rainbow: Evidence for nuclear ripples

NUCLEAR REACTIONS 12C(16O, 16O), E=115.9 MeV; analyzed elastic σ(θ) distribution using coupled channels method with a double folding model derived from a density-dependent effective nucleon-nucleon force, and coupling to excited states of 12C and 16O; deduced evidence for nuclear ripples superimposed on the Airy structure of the nuclear rainbow; described similar mechanism in nuclear and meteorological rainbow.

doi: 10.1103/PhysRevC.89.061601
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2014OH04      Phys.Rev. C 90, 064617 (2014)

S.Ohkubo, Y.Hirabayashi, A.A.Ogloblin, Yu.A.Gloukhov, A.S.Dem'yanova, W.H.Trzaska

Refractive effects and Airy structure in inelastic 16O + 12C rainbow scattering

NUCLEAR REACTIONS 12C(16O, 16O)(16O, 16O'), E=170, 181, 200, 260, 281 MeV; measured particle spectra, σ(E, θ) Jyvaskyla University cyclotron facility; analyzed by coupled-channels method using an extended double folding (EDF) model, and taking into account g.s., first 2+ and 3- states of 12C and 16O; 12C(16O, 16O), (16O, 16O'), E=200, 330, 350, 400, 450, 500, 608 MeV; calculated σ(E, θ) distributions for elastic scattering and inelastic scattering to the first 2+ state in 12C. Comparison with available experimental data; deduced Airy minima in elastic scattering and in inelastic (rainbow) scattering to the first 2+ state of 12C.

doi: 10.1103/PhysRevC.90.064617
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Data from this article have been entered in the XUNDL database. For more information, click here.


2013HA01      Phys.Rev. C 87, 024311 (2013)

Sh.Hamada, Y.Hirabayashi, N.Burtebayev, S.Ohkubo

Observation of an Airy minimum in elastic and inelastic scattering of 3He from 12C at 50.5 and 60 MeV, and α-particle condensation in 12C

NUCLEAR REACTIONS 12C(3He, 3He), (3He, 3He'), E=50.5, 60 MeV;measured particle spectra, energy loss, σ(θ, E) for Hoyle state and other levels. 12C; deduced levels, angular position of Airy minimum A1. Hoyle state interpreted as three α-particle condensate with dilute density. Coupled-channel analysis with double folding model.

doi: 10.1103/PhysRevC.87.024311
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0711. Data from this article have been entered in the XUNDL database. For more information, click here.


2013HI06      Phys.Rev. C 88, 014314 (2013)

Y.Hirabayashi, S.Ohkubo

Unification of Airy structure in inelastic α+16O scattering and α-cluster structure with core excitation in 20Ne

NUCLEAR REACTIONS 16O(α, α'), E=40.5, 50, 80.7, 146 MeV; calculated σ(θ, E). 16O(α, α), E=20.75, 23.7, 24.28, 25.2, 30.3, 40.5, 48.7, 50, 54.1, 69.5, 80.7, 146 MeV; calculated σ(θ, E). Coupled channel method using a microscopic double folding model. 20Ne; calculated levels, J, π, Kπ; deduced α cluster structure. Comparison with experimental data.

doi: 10.1103/PhysRevC.88.014314
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2013KL03      J.Phys.:Conf.Ser. 445, 012036 (2013)

M.A.Klatt, T.Ichikawa, K.Iida, N.Itagaki, J.A.Maruhn, K.Matsuyanagi, K.Mecke, S.Ohkubo, P.-G.Reinhard, B.Schuetrumpf

Exotic cluster structures in the mean-field theory

NUCLEAR STRUCTURE 16O, 40Ca; calculated deformation, exotic shapes using Skyrme Hartree-Fock, TDHF.

doi: 10.1088/1742-6596/445/1/012036
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2013SA16      Nucl.Phys. A908, 73 (2013)

T.Sakuda, S.Ohkubo

Cluster structure and deformed bands in the 38Ar nucleus

NUCLEAR STRUCTURE 38Ar; calculated levels, J, π, bands, rotational bands, superdeformed band, α spectroscopic factor, γ transitions, B(E2) using OCM (orthogonality condition model). Compared to data.

doi: 10.1016/j.nuclphysa.2013.04.005
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2012IC04      Phys.Rev.Lett. 109, 232503 (2012)

T.Ichikawa, J.A.Maruhn, N.Itagaki, K.Matsuyanagi, P.-G.Reinhard, S.Ohkubo

Existence of an Exotic Torus Configuration in High-Spin Excited States of 40Ca

NUCLEAR STRUCTURE 40Ca; calculated high-spin states, J, π, neutron single-particle energies; deduced stable state with thorus configuration. Skyrme Hartree-Fock method, comparison with available data.

doi: 10.1103/PhysRevLett.109.232503
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2011IC04      Phys.Rev.Lett. 107, 112501 (2011)

T.Ichikawa, J.A.Maruhn, N.Itagaki, S.Ohkubo

Linear Chain Structure of Four-α Clusters in 16O

NUCLEAR STRUCTURE 16O; calculated surface and total nucleon density, coefficient of the rotational energy, angular momentum; deduced existence of stable exotic nuclei with large angular momentum of inertia. Skyrme cranked Hartree-Fock method.

doi: 10.1103/PhysRevLett.107.112501
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2011OH01      Int.J.Mod.Phys. E20, 880 (2011)

S.Ohkubo, Y.Hirabayashi

Alpha-Particle condensation in 16O

NUCLEAR STRUCTURE 16O; calculated energies, J, π for K bands states; deduced α+12C(0+2) cluster structure.

doi: 10.1142/S0218301311018885
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2010SU23      Phys.Rev. C 82, 041303 (2010)

Y.Suzuki, S.Ohkubo

Enhanced E1 transitions and α+208Pb(3-) clustering in 212Po

NUCLEAR STRUCTURE 212Po; calculated levels, J, π, bands, B(E1) and B(E2) transition rates using coupled-channel α+208Pb cluster model. Comparison with experimental data.

doi: 10.1103/PhysRevC.82.041303
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2009FU17      Phys.Rev. C 80, 064613 (2009)

M.Fukada, M.K.Takimoto, K.Ogino, S.Ohkubo

α cluster states in 44, 46, 52Ti

NUCLEAR REACTIONS 12C, 16O, 40,42,48Ca(7Li, tα)12C/16O/40Ca/42Ca/48Ca/44Ti/46Ti/52Ti, E=26.0 MeV; measured particle-spectra, tα-coin, and tα(θ); deduced relative ratios of reaction cross sections. 44,46,52Ti; deduced levels, J, π, α-cluster states. Comparison with other experimental data.

doi: 10.1103/PhysRevC.80.064613
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Data from this article have been entered in the XUNDL database. For more information, click here.


2008OH03      Phys.Rev. C 77, 041303 (2008)

S.Ohkubo, Y.Hirabayashi

Evidence for higher nodal band states with 3He cluster structure in 19Ne and prerainbows in 3He+16O scattering

NUCLEAR REACTIONS 16O(3He, X), E=15, 25, 32, 40.9, 60 MeV; calculated σ, angular distributions, central double folding potential, phase shifts. 19Ne; systematics of 3He cluster states. Comparison with experimental data, cluster structure with 3,4He, 16O.

doi: 10.1103/PhysRevC.77.041303
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2007KH02      J.Phys.(London) G34, R111 (2007)

D.T.Khoa, W.von Oertzen, H.G.Bohlen, S.Ohkubo

Nuclear rainbow scattering and nucleus-nucleus potential

doi: 10.1088/0954-3899/34/3/R01
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2007MI46      Eur.Phys.J. Special Topics 150, 41 (2007)

F.Michel, S.Ohkubo

Unexpected transparency in the scattering of fragile 6Li and 6He Nuclei

NUCLEAR REACTIONS 12,14C(6He, 2α), E=35 MeV; measured Eα, Iα, αα-coin. 14C; deduced level energies.

doi: 10.1140/epjst/e2007-00261-1
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2007OH01      Phys.Rev. C 75, 044609 (2007)

S.Ohkubo, Y.Hirabayashi

Evidence for strong refraction of 3He in an α-particle condensate

NUCLEAR REACTIONS 12C(3He, 3He), (3He, 3He'), E=34.7, 72 MeV; analyzed σ(E, θ). 12C deduced α-particle condensate.

doi: 10.1103/PhysRevC.75.044609
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2005FU03      Phys.Rev. C 71, 067602 (2005)

M.Fukada, M.Ohmura, F.Harima, K.Ogino, K.Takimoto, S.Ohkubo

α-cluster states in 38Ar observed via the 34S(7Li, tα)34S reaction

NUCLEAR REACTIONS 34S(7Li, tα), E=26 MeV; measured particle spectra, angular correlations. 38Ar deduced α-cluster states energies, J, π.

doi: 10.1103/PhysRevC.71.067602
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2005MI29      Phys.Rev. C 72, 054601 (2005)

F.Michel, S.Ohkubo

Airy minima in the scattering of weakly bound light heavy ions

NUCLEAR REACTIONS 12C(6Li, 6Li), E=13-318 MeV; 12C(6Li, 6Li'), E=24, 30 MeV; 16O(6Li, 6Li), E=13-48 MeV; 12C(6He, 6He), E=18 MeV; analyzed σ(θ); deduced transparency, refractive features.

doi: 10.1103/PhysRevC.72.054601
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2004MI12      Eur.Phys.J. A 19, 333 (2004)

F.Michel, S.Ohkubo

Evolution of Airy structure in 12C(12C, 12C)12C between 5 and 10 MeV/A

NUCLEAR REACTIONS 12C(12C, 12C), E=70-130 MeV; calculated σ(θ), incomplete absorption features, properties of Airy minima. Global optical potential.

doi: 10.1140/epja/i2003-10133-0
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2004MI33      Nucl.Phys. A738, 231 (2004)

F.Michel, S.Ohkubo

Airy structure in inelastic light heavy-ion scattering?

NUCLEAR REACTIONS 40Ca(α, α), (α, α'), E=29-100 MeV; analyzed σ(θ), energy dependence of Airy minima.

doi: 10.1016/j.nuclphysa.2004.04.037
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2004MI46      Phys.Rev. C 70, 044609 (2004)

F.Michel, S.Ohkubo

Airy structure in inelastic light-ion and light heavy-ion scattering

NUCLEAR REACTIONS 40Ca(α, α), (α, α'), E=28-100 MeV; 16O(16O, 16O), (16O, 16O'), E=124 MeV; analyzed σ(θ), Airy structure; deduced phase rules between elastic and inelastic scattering.

doi: 10.1103/PhysRevC.70.044609
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2004OH01      Phys.Lett. B 578, 304 (2004)

S.Ohkubo, K.Yamashita

Parity-doublet 16O + 12C cluster bands in 28Si

NUCLEAR STRUCTURE 28Si; calculated molecular cluster bands energy, J, π, superdeformation. Relationship to Airy structure in scattering data discussed.

doi: 10.1016/j.physletb.2003.10.076
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2004OH13      Phys.Rev. C 70, 041602 (2004)

S.Ohkubo, Y.Hirabayashi

Bose-Einstein condensation of α particles and Airy structure in nuclear rainbow scattering

NUCLEAR REACTIONS 12C(α, α), (α, α'), E=139-240 MeV; analyzed σ(E, θ); deduced Airy structure. 12C deduced α-particle density distribution, Bose-Einstein condensation features. Coupled-channels analysis, double-folding model.

doi: 10.1103/PhysRevC.70.041602
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2004SA51      Nucl.Phys. A744, 77 (2004); Erratum Nucl.Phys. A748, 699 (2005)

T.Sakuda, S.Ohkubo

Superdeformation and α-cluster structure of the nucleus 36Ar

NUCLEAR STRUCTURE 36Ar; calculated levels, J, π, B(E2), spectroscopic factors, superdeformed band properties, α-cluster structure. Comparison with data.

doi: 10.1016/j.nuclphysa.2004.08.016
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2003OH03      Yad.Fiz. 66, 1534 (2003); Phys.Atomic Nuclei 66, 1489 (2003)

S.Ohkubo

Rainbow, Airy Structure, and Molecular Structure in the 16O + 16O System

NUCLEAR REACTIONS 16O(16O, 16O), E(cm)=12.5-31.5 MeV; calculated σ(θ), molecular band states energies, J, π. Global deep potential.

doi: 10.1134/1.1601754
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2003OH09      Nucl.Phys. A722, 414c (2003)

S.Ohkubo

Airy structure in rainbow scattering and nucleus-nucleus interaction

NUCLEAR STRUCTURE 28Si, 32S; calculated cluster structure, molecular bands features.

doi: 10.1016/S0375-9474(03)01399-X
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2003OH10      Acta Phys.Hung.N.S. 18, 287 (2003)

S.Ohkubo

16O + 16O Molecular Structure and Superdeformation in 32S

NUCLEAR STRUCTURE 32S; analyzed cluster structure, superdeformation.

doi: 10.1556/APH.18.2003.2-4.28
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2002HI07      Yad.Fiz. 65, 715 (2002); Phys.Atomic Nuclei 65, 683 (2002)

Y.Hirabayashi, S.Ohkubo

Alpha Scattering from Nonclosed Shell Nucleus 12C and Alpha-Nucleus Interaction

NUCLEAR REACTIONS 12C(α, α), (α, α'), E=41-172.5 MeV; analyzed σ(θ), σ(E, θ). Microscopic α-cluster model wave functions.

doi: 10.1134/1.1471274
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2002MI19      Yad.Fiz. 65, 706 (2002); Phys.Atomic Nuclei 65, 674 (2002)

F.Michel, F.Brau, G.Reidemeister, S.Ohkubo

Interpretation of Airy Minima in 16O + 16O and 16O + 12C Elastic Scattering in Terms of a Barrier-Wave/Internal-Wave Decomposition

NUCLEAR REACTIONS 16O(16O, 16O), E=124 MeV; 12C(16O, 16O), E=132 MeV; calculated σ(θ), contribution of barrier-wave/internal-wave interference to Airy minima.

doi: 10.1134/1.1471272
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2002MI39      Phys.Rev.Lett. 89, 152701 (2002)

F.Michel, G.Reidemeister, S.Ohkubo

Luneburg Lens Approach to Nuclear Rainbow Scattering

NUCLEAR REACTIONS 12C(16O, 16O), E=132 MeV; analyzed σ(θ). 16O(16O, 16O), E=75 MeV; analyzed potential, trajectory features. Luneburg lens approach, differences between optical and nuclear mechanisms discussed.

doi: 10.1103/PhysRevLett.89.152701
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2002OH03      Phys.Rev. C66, 021301 (2002)

S.Ohkubo, K.Yamashita

Evidence for 16O + 16O cluster bands in 32S

NUCLEAR REACTIONS 16O(16O, 16O), E(cm)=12.5-31.5 MeV; calculated, analyzed σ(θ). 32S deduced cluster band features.

NUCLEAR STRUCTURE 32S; calculated cluster band level energies, J, π, radii, transitions B(E2).

doi: 10.1103/PhysRevC.66.021301
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2002SA21      Yad.Fiz. 65, 735 (2002); Phys.Atomic Nuclei 65, 703 (2002)

T.Sakuda, S.Ohkubo

Cluster Structure of 48Cr

NUCLEAR STRUCTURE 48Cr; calculated α-cluster states J, π, B(E2). Comparison with data.

doi: 10.1134/1.1471277
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2002SA48      Nucl.Phys. A712, 59 (2002)

T.Sakuda, S.Ohkubo

Cluster structure and collective behavior of the nucleus 48Cr

NUCLEAR STRUCTURE 48Ca; calculated levels, J, π, spectroscopic factors, B(E2). Cluster model.

doi: 10.1016/S0375-9474(02)01182-X
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2001MI06      Phys.Rev. C63, 034620 (2001)

F.Michel, G.Reidemeister, S.Ohkubo

Airy Structure in 16O + 16O Elastic Scattering between 5 and 10 MeV/nucleon

NUCLEAR REACTIONS 16O(16O, 16O), E=75-145 MeV; 12C(16O, 16O), E=132 MeV; calculated σ(θ), barrier- and internal-wave components; deduced origin of Airy structure. Comparison with nearside/farside decomposition.

doi: 10.1103/PhysRevC.63.034620
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2000MI06      Phys.Rev. C61, 041601 (2000)

F.Michel, G.Reidemeister, S.Ohkubo

Unexpected Transparency in Low Energy 90Zr(α, α0) Scattering and α-Cluster Structure in 94Mo

NUCLEAR REACTIONS 90Zr(α, α), E=18-40 MeV; analyzed σ, σ(θ); deduced optical potential features. 94Mo deduced α-cluster structure.

doi: 10.1103/PhysRevC.61.041601
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2000MI20      Phys.Rev.Lett. 85, 1823 (2000)

F.Michel, F.Brau, G.Reidemeister, S.Ohkubo

Barrier-Wave-Internal-Wave Interference and Airy Minima in 16O + 16O Elastic Scattering

NUCLEAR REACTIONS 16O(16O, 16O), E=124 MeV; calculated σ(θ); deduced role of barrier-wave - internal-wave interference mechanism.

doi: 10.1103/PhysRevLett.85.1823
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1998MI33      Prog.Theor.Phys.(Kyoto), Suppl. 132, 7 (1998)

F.Michel, S.Ohkubo, G.Reidemeister

Local Potential Approach to the Alpha-Nucleus Interaction and Alpha-Cluster Structure in Nuclei

NUCLEAR REACTIONS 16O, 40Ca, 36Ar, 90Zr, 208Pb(α, α), E=18-146 MeV; analyzed σ(θ); deduced optical potential features. 20Ne, 44Ti, 40Ca, 94Mo, 212Po deduced α-cluster structure features.

doi: 10.1143/PTPS.132.7
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1998OH03      Phys.Rev. C57, 2760 (1998)

S.Ohkubo, Y.Hirabayashi, T.Sakuda

α-Cluster Structure of 44Ti in Core-Excited α + 40Ca Model

NUCLEAR STRUCTURE 44Ti; calculated levels, J, π, rotational bands. α-cluster model.

doi: 10.1103/PhysRevC.57.2760
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1998SA04      Phys.Rev. C57, 1184 (1998)

T.Sakuda, S.Ohkubo

Structure of 43Sc in the α + 39K Cluster Model

NUCLEAR STRUCTURE 43Sc; calculated levels, J, π, B(λ). Microscopic α plus 39K cluster model.

doi: 10.1103/PhysRevC.57.1184
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1998SA69      Prog.Theor.Phys.(Kyoto), Suppl. 132, 103 (1998)

T.Sakuda, S.Ohkubo

Microscopic Study of Coexistence of Alpha-Cluster and Shell-Model Structure in the 40Ca-44Ti Region

NUCLEAR STRUCTURE 40,41,42Ca, 42,43Sc; calculated levels, J, π, B(E2). Microscopic α-plus-core model.

doi: 10.1143/PTPS.132.103
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1998YA21      Prog.Theor.Phys.(Kyoto), Suppl. 132, 73 (1998)

T.Yamaya, K.Katori, M.Fujiwara, S.Kato, S.Ohkubo

Alpha-Cluster Study of 40Ca and 44Ti by the (6Li, d) Reaction

NUCLEAR REACTIONS 36Ar, 40Ca, 90Zr(6Li, d), E=50 MeV; 40Ca(6Li, d), E=37 MeV; measured deuteron spectra, σ(E, θ). 40Ca, 44Ti, 94Mo deduced levels, J, π, parity doublet bands, possible α-cluster states.

doi: 10.1143/PTPS.132.73
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1996YA01      Phys.Rev. C53, 131 (1996)

T.Yamaya, K.Ishigaki, H.Ishiyama, T.Suehiro, S.Kato, M.Fujiwara, K.Katori, M.H.Tanaka, S.Kubono, V.Guimaraes, S.Ohkubo

α-Cluster States above the Threshold Energy in 44Ti

NUCLEAR REACTIONS 40Ca(6Li, d), E=37 MeV; measured σ(θ), σ(Ed). 44Ti deduced levels, J, π, α spectroscopic factors.

doi: 10.1103/PhysRevC.53.131
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE1597.


1995OH01      Phys.Rev.Lett. 74, 2176 (1995)

S.Ohkubo

Alpha Clustering and Structure of 94Mo and 212Po

NUCLEAR REACTIONS 90Zr(α, α), E=23.4-79.5 MeV; 208Pb(α, α), E=19-42 MeV; analyzed σ(θ). 94Mo, 212Po deduced α-cluster states evidence. Double folding model, local potential approach.

doi: 10.1103/PhysRevLett.74.2176
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1995SA02      Phys.Rev. C51, 586 (1995)

T.Sakuda, S.Ohkubo

Structure Study of 42Ca by α + 38Ar Cluster Model: Coexistence of alpha-particle clustering and shell structure

NUCLEAR STRUCTURE 42Ca; calculated levels, B(λ), charge form factors, α-spectroscopic factors. Orthogonality condition, α+38Ar cluster model.

doi: 10.1103/PhysRevC.51.586
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1994MI19      Z.Phys. A349, 297 (1994)

I.Miyamoto, S.Ohkubo

Weak Coupling in the Upper Part of the sd-Shell and α-Clustering in 38Ar

NUCLEAR REACTIONS 34S(α, α), E=18 MeV; analyzed σ(θ). 38Ar deduced clustering features. Weak-coupling, α-clusters.

NUCLEAR STRUCTURE 38Ar; calculated levels, B(λ), α-reduced widths. Weak-coupling, α-clusters.

doi: 10.1007/BF01288978
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1994SA01      Phys.Rev. C49, 149 (1994)

T.Sakuda, S.Ohkubo

Structure Study of 40Ca by α + 36Ar Cluster Model

NUCLEAR STRUCTURE 40Ca; calculated levels, α spectroscopic factors, B(λ). Orthogonality condition model, α+36Ar cluster.

doi: 10.1103/PhysRevC.49.149
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1994SA47      Z.Phys. A349, 361 (1994)

T.Sakuda, S.Ohkubo

Coexistence of α-Clustering and Shell Structure in 40Ca

NUCLEAR STRUCTURE 40Ca; calculated levels, α spectroscopic factors; deduced α-cluster, shell model type state coexistence. Microscopic α+36Ar cluster model.

doi: 10.1007/BF01288997
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1994YA04      Nucl.Phys. A573, 154 (1994)

T.Yamaya, M.Saitoh, M.Fujiwara, T.Itahashi, K.Katori, T.Suehiro, S.Kato, S.Hatori, S.Ohkubo

Cluster Structure in 40Ca via the α-Transfer Reaction

NUCLEAR REACTIONS 36Ar(6Li, d), E=50 MeV; measured σ(Ed), σ(θ). 40Ca deduced levels, J, π, L, spectroscopic factors. Enriched target.

doi: 10.1016/0375-9474(94)90019-1
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE1575.


1994YA08      Z.Phys. A349, 357 (1994)

T.Yamaya, S.Ohkubo

Higher Nodal α-Cluster Band in 40Ca

NUCLEAR REACTIONS 36Ar(6Li, d), E=50 MeV; analyzed σ(θ). 40Ca deduced levels, K, π, band structure, α-cluster features.

doi: 10.1007/BF01288995
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1994YA09      Z.Phys. A349, 363 (1994)

T.Yamada, S.Ohkubo

Core-Excited α-Cluster Structure in 44Ti

NUCLEAR STRUCTURE 44Ti; calculated levels, B(λ). Core-excited α-cluster model.

doi: 10.1007/BF01288998
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1993YA04      Phys.Rev. C47, 2389 (1993)

T.Yamaya, S.Ohkubo, S.Okabe, M.Fujiwara

Spectroscopic Factors for α-Cluster Wave Functions in 44Ti Observed via the (6Li, d) Reaction

NUCLEAR REACTIONS 40Ca(6Li, d), E=50 MeV; analyzed σ(θ) data. 44Ti levels deduced α-cluster states, spectroscopic factors.

doi: 10.1103/PhysRevC.47.2389
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1993YA07      Phys.Lett. 306B, 1 (1993)

T.Yamaya, M.Saito, M.Fujiwara, T.Itahashi, K.Katori, T.Suehiro, S.Kato, S.Hatori, S.Ohkubo

Alpha-Cluster Bands in 40Ca Observed via the (6Li, d) Reaction

NUCLEAR REACTIONS 36Ar(6Li, d), E=50 MeV; measured σ(θ), σ(Ed). 40Ca deduced levels, J, π, K, band structure, α-cluster features.

doi: 10.1016/0370-2693(93)91128-A
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE1474.


1990RE02      Phys.Rev. C41, 63 (1990)

G.Reidemeister, S.Ohkubo, F.Michel

Alpha-Cluster Spectroscopy in 40Ca and in the sd-Shell Closure Region

NUCLEAR REACTIONS 36Ar(α, α), E=18-41 MeV; analyzed σ(E, θ); deduced optical model parameters.

NUCLEAR STRUCTURE 40Ca; calculated α-cluster states, rms radii, B(λ). Discussed other s-d shell nuclei.

doi: 10.1103/PhysRevC.41.63
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1990YA03      Phys.Rev. C41, 2421 (1990)

T.Yamaya, S.Oh-ami, O.Satoh, M.Fujiwara, T.Itahashi, K.Katori, S.Kato, M.Tosaki, S.Hatori, S.Ohkubo

Experimental Examination of the Lowest Alpha Cluster States in 44Ti

NUCLEAR REACTIONS 40Ca(6Li, d), E=50 MeV; measured σ(Ed), σ(θ). 44Ti deduced level J, π, α-cluster strength.

doi: 10.1103/PhysRevC.41.2421
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE1313.


1990YA09      Phys.Rev. C42, 1935 (1990)

T.Yamaya, S.Oh-ami, M.Fujiwara, T.Itahashi, K.Katori, M.Tosaki, S.Kato, S.Hatori, S.Ohkubo

Existence of α-Cluster Structure in 44Ti via the (6Li, d) Reaction

NUCLEAR REACTIONS 40Ca(6Li, d), E=50 MeV; measured σ(θ). 44Ti deduced levels, transferred angular momentum L, spectroscopic factors Sα, J, π. Enriched target. DWBA analysis.

doi: 10.1103/PhysRevC.42.1935
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE1314.


1989OH01      Phys.Rev. C39, 1186 (1989)

S.Ohkubo

Local Potential α-Cluster Model and the Wildermuth Condition

NUCLEAR REACTIONS 40Ca(α, α), E not given; calculated local potential features; deduced Wildermuth condition inadegency. Alpha-cluster model.

doi: 10.1103/PhysRevC.39.1186
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1988MI01      Phys.Rev. C37, 292 (1988)

F.Michel, G.Reidemeister, S.Ohkubo

Potential Description of the Positive- and Negative-Energy Properties of the α + 40Ca System and α-Cluster Structure of 44Ti

NUCLEAR STRUCTURE 44Ti; calculated levels, B(E2), α-spectroscopic factors, rms radii, Γ. Local potential model, α+40Ca cluster structure.

NUCLEAR REACTIONS 40Ca(α, α), E ≤ 50 MeV; calculated phase shifts. Local potential model, α+40Ca cluster model.

doi: 10.1103/PhysRevC.37.292
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1988OH06      Phys.Rev. C38, 2377 (1988)

S.Ohkubo

Alpha-Cluster Model Theory of 44Ti and an Effective Two-Body Interaction

NUCLEAR STRUCTURE 44Ti; calculated levels. α-cluster model.

NUCLEAR REACTIONS, ICPND 40Ca(α, α), E=18-100 MeV; calculated σ(θ) vs E. 40Ca(α, X), E ≈ 5-25 MeV; calculated fusion σ(E). Folding, α-cluster models.

doi: 10.1103/PhysRevC.38.2377
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1988OH07      Prog.Theor.Phys.(Kyoto) 80, 598 (1988)

S.Ohkubo, K.Umehara

Inversion Doublet K=0- Band with the α + 36Ar Cluster Structure in 40Ca

NUCLEAR REACTIONS 36Ar(α, α), E=22.1-29.2 MeV; analyzed σ(θ); deduced potential, cluster structure of 40Ca.

NUCLEAR STRUCTURE 40Ca; calculated rotational band. Potential for 36Ar+α.

doi: 10.1143/PTP.80.598
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1987MI07      Phys.Rev. C35, 1961 (1987)

F.Michel, G.Reidemeister, S.Ohkubo

Last Members of the K(π) = 04+ α-Cluster Rotational Band in 20Ne

NUCLEAR STRUCTURE 20Ne; calculated rotational bands. α-16O cluster.

NUCLEAR REACTIONS, ICPND 16O(α, γ), (α, X), E=15-40 MeV; calculated reaction, fusion σ(E).

doi: 10.1103/PhysRevC.35.1961
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1987OH06      Phys.Rev. C36, 551 (1987)

S.Ohkubo

Backward-Angle Anomaly in α + 40Ca Scattering and Molecular Vibrational States in 44Ti

NUCLEAR REACTIONS 40Ca(α, α), E=18-50 MeV; calculated σ(E, θ); deduced phase shifts. 44Ti deduced levels, J, π. α-cluster, optical model analyses.

doi: 10.1103/PhysRevC.36.551
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1987OH08      Phys.Rev. C36, 966 (1987)

S.Ohkubo, D.M.Brink

Internal and Barrier Wave Interpretation of the Oscillations of the Fusion Excitation Function

NUCLEAR REACTIONS, ICPND 40Ca(α, α), E=5-20 MeV; calculated phase shifts vs E. 40Ca(α, X), E=5-20 MeV; calculated fusion σ(E). 44Ti deduced levels, J, π. Semi-classical model.

doi: 10.1103/PhysRevC.36.966
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1987OH09      Phys.Rev. C36, 1375 (1987)

S.Ohkubo, D.M.Brink

Origin of the Oscillations in the 12C + 12C Fusion Excitation Function in Terms of Internal and Barrier Waves

NUCLEAR REACTIONS 12C(12C, X), E ≈ 8-32 MeV; calculated fusion σ(E). 24Mg deduced levels, J, π. Semi-classical method.

doi: 10.1103/PhysRevC.36.1375
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1986MI20      Phys.Rev.Lett. 57, 1215 (1986)

F.Michel, G.Reidemeister, S.Ohkubo

Evidence for Alpha-Particle Clustering in the 44Ti Nucleus

NUCLEAR STRUCTURE 44Ti; calculated levels, B(E2), intercluster rms radii; deduced α-clustering effects.

doi: 10.1103/PhysRevLett.57.1215
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1986MI21      Phys.Rev. C34, 1248 (1986)

F.Michel, G.Reidemeister, S.Ohkubo

Molecular Interpretation of the Oscillations of the Fusion Excitation Function for the α + 40Ca System

NUCLEAR STRUCTURE 44Ti; calculated bound, quasibound levels; deduced rotational bands. Cluster model.

NUCLEAR REACTIONS, ICPND 40Ca(α, α), (α, X), E=10-27 MeV; calculated fusion, reaction σ(E), σ(θ); deduced optical model parameters. 44Ti deduced positive band structure. Optical model analysis.

doi: 10.1103/PhysRevC.34.1248
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1985OH01      Phys.Lett. 150B, 25 (1985)

S.Ohkubo, M.Kamimura

The Dynamically Induced Spin-Orbit Interaction of the 19F Projectile

NUCLEAR REACTIONS 28Si(19F, 19F), E=60 MeV; calculated σ(θ), P(θ); deduced spin-orbit potential dynamical component. Coupled-channels formalism.

doi: 10.1016/0370-2693(85)90130-3
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1985OH04      Phys.Rev. C31, 1560 (1985)

S.Ohkubo, Y.Ishikawa

Higher Nodal States of Alpha + 15N Cluster Structure in 19F

NUCLEAR REACTIONS 15N(α, α), E=22, 24, 28 MeV; analyzed σ(θ); calculated phase shifts, forward scattering amplitudes. 19F deduced α-cluster structure vibrational state.

doi: 10.1103/PhysRevC.31.1560
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1983OH04      Phys.Rev. C28, 2312 (1983)

S.Ohkubo

Spin-Orbit Effect on Backward Angle Anomaly in Heavy Ion Scattering

NUCLEAR REACTIONS 9Be(12C, 12C), E=20, 26, 39.68, 43.75 MeV; calculated σ(θ); deduced spin-orbit potential role, optical model parameters.

doi: 10.1103/PhysRevC.28.2312
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1982OH05      Phys.Rev. C25, 2498 (1982)

S.Ohkubo

Analyzing Powers in Heavy Ion Scattering with Identical Cores

NUCLEAR REACTIONS 12C(13C, 13C), E=16.25, 20.58 MeV; 18O(19F, 19F), E=30 MeV; calculated σ(θ), A(θ). 16O(15N, 15N), E=25 MeV; calculated σ(θ), A(θ). 16O(15N, 15N), E=27.5 MeV; calculated σ(θ); deduced large oscillations. Parity dependent potential model.

doi: 10.1103/PhysRevC.25.2498
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1981OH07      Prog.Theor.Phys.(Kyoto) 66, 729 (1981)

S.Ohkubo

Parity Dependent Potential in Polarized Triton Scattering

NUCLEAR REACTIONS 12C(polarized t, t), E=15, 17 MeV; analyzed σ(θ), A(θ); deduced parity dependence effects in potential.

doi: 10.1143/PTP.66.729
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1980OH03      Phys.Rev. C22, 36 (1980)

S.Ohkubo

Backward Angle Anomaly in Inelastic Alpha Scattering from Calcium Isotopes

NUCLEAR REACTIONS 40,42,44,48Ca(α, α'), E=24, 29 MeV; analyzed σ(θ). Parity dependent potential, coupled channels calculation.

doi: 10.1103/PhysRevC.22.36
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1977OH01      Progr.Theor.Phys. 57, 82 (1977)

S.Ohkubo, Y.Kondo, S.Nagata

Backward Angle Anomaly in Alpha + 16O Scattering and Alpha-Cluster States in 20Ne

NUCLEAR REACTIONS 16O(α, α), E=20-25 MeV; calculated σ(θ); deduced backward angle anomaly. 20Ne deduced α-cluster states.

doi: 10.1143/PTP.57.82
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1975KO28      Progr.Theor.Phys. 53, 1006 (1975)

Y.Kondo, S.Nagata, S.Ohkubo, O.Tanimura

Backward Angle Anomaly in Alpha-Nucleus Scattering and Parity-Dependent Optical Model

NUCLEAR REACTIONS 40,42,44,48Ca(α, α), E=18, 22, 24, 29 MeV; calculated σ.

doi: 10.1143/PTP.53.1006
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