Publications (35)83.73 Total impact

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ABSTRACT: The differential cross sections of the 16O(p,d) reaction populating the ground state and several lowlying excited states in 15O were measured using 198, 295 and 392MeV proton beams at the Research Center for Nuclear Physics (RCNP), Osaka University, to study the effect of the tensor interactions in 16O. Dividing the cross sections for each excited state by the one for the ground state and comparing the ratios over a wide range of momentum transfer, we found a marked enhancement of the ratio for the positiveparity state(s). The observation is consistent with large components of highmomentum neutrons in the groundstate configurations of 16O due possibly to the tensor interactions.Journal of Physics Conference Series 12/2014; 569(1). DOI:10.1088/17426596/569/1/012066 
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ABSTRACT: We have measured the 16O(p, d) reaction using 198, 295 and 392MeV proton beams to search for a direct evidence on an effect of the tensor interactions in light nucleus. Differential cross sections of the oneneutron transfer reaction populating the ground states and several lowlying excited states in 15O were measured. Comparing the ratios of the cross sections for each excited state to the one for the ground state over a wide range of momentum transfer, we found a marked enhancement of the ratio for the positiveparity state(s). The observation is consistent with large components of highmomentum neutrons in the initial groundstate configurations due to the tensor interactions.Physics Letters B 10/2013; 725(45):277281. DOI:10.1016/j.physletb.2013.07.038 · 6.02 Impact Factor 
Physical Review C 06/2012; DOI:10.1103/PhysRevC.85.069901 · 3.88 Impact Factor

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ABSTRACT: We have measured 16O(p,d) reaction using 198, 295 and 392MeV proton beams to search for a direct evidence on the effect of the tensor interactions in light nucleus. Differential cross sections of the oneneutron transfer reactions populating the ground states and several lowlying excited states in 15O were measured. Comparing the ratios of the cross sections for each excited state to the one for the ground state over a wide range of momentum transfer, we found a marked enhancement for the positiveparity state(s). The observation indicates large components of highmomentum neutrons in the initial groundstate configurations, due possibly to the tensor interactions.The European Physical Journal Conferences 05/2012; 66. DOI:10.1051/epjconf/20146602076 
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ABSTRACT: We present a new global optical potential (GOP) for nucleusnucleus systems, including neutronrich and protonrich isotopes, in the energy range of $50 \sim 400$ MeV/u. The GOP is derived from the microscopic folding model with the complex $G$matrix interaction CEG07 and the global density presented by S{\~ a}o Paulo group. The folding model well accounts for realistic complex optical potentials of nucleusnucleus systems and reproduces the existing elastic scattering data for stable heavyion projectiles at incident energies above 50 MeV/u. We then calculate the foldingmodel potentials (FMPs) for projectiles of eveneven isotopes, $^{822}$C, $^{1224}$O, $^{1638}$Ne, $^{2040}$Mg, $^{2248}$Si, $^{2652}$S, $^{3062}$Ar, and $^{3470}$Ca, scattered by stable target nuclei of $^{12}$C, $^{16}$O, $^{28}$Si, $^{40}$Ca $^{58}$Ni, $^{90}$Zr, $^{120}$Sn, and $^{208}$Pb at the incident energy of 50, 60, 70, 80, 100, 120, 140, 160, 180, 200, 250, 300, 350, and 400 MeV/u. The calculated FMP is represented, with a sufficient accuracy, by a linear combination of 10range Gaussian functions. The expansion coefficients depend on the incident energy, the projectile and target mass numbers and the projectile atomic number, while the range parameters are taken to depend only on the projectile and target mass numbers. The adequate mass region of the present GOP by the global density is inspected in comparison with FMP by realistic density. The full set of the range parameters and the coefficients for all the projectiletarget combinations at each incident energy are provided on a permanent openaccess website together with a Fortran program for calculating the microscopicbasis GOP (MGOP) for a desired projectile nucleus by the spline interpolation over the incident energy and the target mass number.Physical Review C 04/2012; 85(4). DOI:10.1103/PhysRevC.85.044607 · 3.88 Impact Factor 
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ABSTRACT: We investigate the α+d elastic scattering and the radiative capture reaction of 2H(α, γ)6Li based on the α + p + n threebody model. The α+d scattering states are described by using the complexscaled solutions of the LippmannSchwinger equation. We calculate the elastic phase shifts for the α+d scattering and the radiative capture cross section of 6Li. We evaluate the contributions of the α + p + n structures in those observables. It is found that in the α+d scattering process, the deuteron breakup and the rearrangement to the 5He + p and 5Li + n channels play prominent roles in reproducing the observed phase shifts and radiative capture cross section.Physical Review C 12/2011; 84(6). DOI:10.1103/PhysRevC.84.064610 · 3.88 Impact Factor 
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ABSTRACT: We investigate the threebody Coulomb breakup of a twoneutron halo nucleus, 6He. We calculate the breakup cross section and the invariant mass spectra by using the complexscaled solutions of the LippmannSchwinger equation, and discuss the relations between the structures in these observables and the nn and alphan correlations in 6He.International Journal of Modern Physics E 04/2011; 20:843846. DOI:10.1142/S0218301311018812 · 0.84 Impact Factor 
Article: Enhanced collectivity in 74Ni
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ABSTRACT: The neutronrich nucleus 74Ni was studied with inversekinematics inelastic proton scattering using a 74Ni radioactive beam incident on a liquid hydrogen targetat a centerofmass energy of 80 MeV. From the measured deexcitation gammarays, the population of the first 2+ state was quantified. The angleintegrated excitation cross section was determined to be 14(4) mb. A deformation length of delta = 1.04(16) fm was extracted in comparison with distorted wave theory, which suggests that the enhancement of collectivity established for 70Ni continues up to 74Ni. A comparison with results of shell model and quasiparticle random phase approximation calculations indicates that the magic character of Z = 28 or N = 50 is weakened in 74Ni.Physics Letters B 08/2010; 692(5). DOI:10.1016/j.physletb.2010.07.052 · 6.02 Impact Factor 
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ABSTRACT: We investigate the threebody Coulomb breakup of a twoneutron halo nucleus, 6He. The threebody scattering states of 6He are described by using the Complexscaled solutions of the LippmannSchwinger equation. We calculate the breakup cross section and the invariant mass spectra, and discuss the relations between the structures in these observables and the nn and alphan correlations of 6He.Modern Physics Letters A 07/2010; 25:19071910. DOI:10.1142/S0217732310000617 · 1.34 Impact Factor 
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ABSTRACT: We study theoretically the elastic scattering of B from ¹²C at E{sub lab}=95 MeV. The B nucleus consists of weakly bound Be and proton, while the Be nucleus has an internal cluster structure of alpha+³He. We treat the last proton in B in the adiabatic recoil approximation and also take into account the excitation of Be including resonance states by a coupledchannel method with consideration of the cluster structure. It turns out that the excitation to the resonance state of Be in B is important for the B elastic scattering.Physical Review C 06/2010; 81(6):061602061602. DOI:10.1103/PHYSREVC.81.061602 · 3.88 Impact Factor 
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ABSTRACT: We reanalyze the 16O+16O inelastic scattering to the single 21+ and 31 excitation channels at an incident energy of Elab=1120 MeV by a microscopic coupledchannel (CC) calculation with complex Gmatrix interaction. The imaginary part of the folded potential is renormalized so as to reproduce the elastic angular distribution. It is found that the results of full CC calculations are still inconsistent with the experimental data for both 21+ and 31 channels. It is also found that when the imaginary coupling terms are omitted, the calculated 21+channel cross sections are improved, although the 31channel cross sections are slightly overestimated.Physical Review C 04/2010; 81(4). DOI:10.1103/PhysRevC.81.047605 · 3.88 Impact Factor 
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ABSTRACT: We investigate the threebody Coulomb breakup of a twoneutron halo nucleus, He. Based on the alpha+n+n model, the threebody scattering states of He are described by using the combined methods of the complex scaling and the LippmannSchwinger equation. We calculate the breakup cross section, the twodimensional energy distributions, and the invariant mass spectra for the E1 transition of He. We discuss the relations between the structures in these strengths and the nn and alphan correlations of He. It is found that the He resonance in the final states contributes to make a lowenergy enhancement of the strength. The nn finalstate interaction also contributes to enhance the strength globally. However, the groundstate correlations of He, such as a dineutron, are difficult to recognize in the strength because of the dominant effect of the finalstate interaction.Physical Review C 04/2010; 81(4):044308044308. DOI:10.1103/PHYSREVC.81.044308 · 3.88 Impact Factor 
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ABSTRACT: Nuclear breakup process is very important for light unstable nuclei (typically halo nuclei) induced reactions because of their weakbinding nature. The continuumdiscretized coupledchannel (CDCC) method is known to be one of the powerful method to describe the nuclear breakup reaction. Indeed, CDCC has been applied to a number of analyses for the breakup reactions of both the stable and unstable nuclei, and the successful results have been obtained. In the present study, we propose complexscaled CDCC (CSCDCC) method, in which only the internal coordinate and momentum of the projectile are complexscaled. The expected advantages of CSCDCC are (1) in spite of the discretization, we can obtain the continuous S matrix elements without the smoothing function, because the continuum level density is correctly obtained, (2) in the framework of the complex scaling method, threebody scattering state can be solved properly, (3) the resonance state is strictly separated from the continuum states, and this fact is more advantageous for investigation of reaction mechanism than the ordinary CDCC method. We apply CSCDCC to the d >p+n breakup reaction on a ^58Ni target at Ed=80 MeV to confirm the availability of CSCDCC. We also plan to apply it to breakup reactions of light unstable nuclei. 
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ABSTRACT: The ^11Li nucleus has characteristc features of neutronrich nuclei such as twoneutron halo structure and large swave mixing in the ground state, and has been studied with keen interest from both theoretical and experimental sides. Experimentally, the Coulomb breakup reactions have been performed to investigate the exotic features of ^11Li, and significant E1 strength was measured at low excitation energy. However, the nature of this soft E1 excitation for ^11Li is not clearly understood. To understand the nature of the soft E1 excitation, it is necessary to understand the complicated structure of ^11Li, which contains both ^9Lin and n n correlations. In the present study, we investigate soft E1 excitation for ^11Li based on the core+n+n threebody model. We analyze the E1 strength as a function of relative energies in binary subsystems in ^11Li, and discuss the correlations of ^9Lin and nn subsystems through the soft E1 excitation. 
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ABSTRACT: We have analyzed 16O+16O inelastic scattering to the single 21+ and 31 channels at incident energies of Elab=350 and 1120 MeV by a microscopic coupledchannel calculation. We have found that the strong rotational coupling among the channels of the α+12Cg.s. type cluster states plays an important role in reproducing the angular distribution of the 21+ channel for both energies. We have also found that the coupling with the 02+, 21+, and 41+ channels as well as those among the shell channels has a large effect on the 31 channel cross sections at Elab=350 MeV. However, their absolute values could not be reproduced by our calculation, unless we assumed that the strengths of the 31→02+,21+,41+ transitions were unphysically strong.Physical Review C 07/2009; 80(1). DOI:10.1103/PhysRevC.80.014605 · 3.88 Impact Factor 
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ABSTRACT: Proton inelastic scattering on the neutronrich nucleus 32Mg has been studied at 46.5 MeV/nucleon in inverse kinematics. Populated states were identified by measuring deexcitation γ rays, in which five new states were found by γγ coincidence analyses. By analyzing the angular differential cross sections via coupledchannel calculations, their spins and parities were constrained and the amplitudes for each transition were extracted. The spin and parity of the 2321keV state was assigned as 41+. The ratio between the energies of the 21+ and 41+ states indicates that 32Mg is a transitional nucleus rather than an axially deformed rigid rotor. The collectivities in the nucleus 32Mg with N=20 are discussed based on the results obtained in the present experiment. 
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ABSTRACT: We propose a new method to describe threebody breakups of nuclei, in which the LippmannSchwinger equation is solved combining with the complex scaling method. The complexscaled solutions of the LippmannSchwinger equation (CSLS) enables us to treat boundary conditions of manybody open channels correctly and to describe a manybody breakup amplitude from the ground state. The Coulomb breakup cross section from the 6He ground state into 4He+n+n threebody decaying states as a function of the total excitation energy is calculated by using CSLS, and the result well reproduces the experimental data. Furthermore, the twodimensional energy distribution of the E1 transition strength is obtained and an importance of the 5He(3/2) resonance is confirmed. It is shown that CSLS is a promising method to investigate correlations of subsystems in threebody breakup reactions of the weaklybound nuclei. Comment: 12 pages, 6 figures, submitted to Progress of Theoretical Physics; section 2.4 added, 2 equations added, 1 equation replacedProgress of Theoretical Physics 05/2009; DOI:10.1143/PTP.122.499 · 2.06 Impact Factor 
Article: Persistent decoupling of valence neutrons toward the dripline: Study of 20C by γ spectroscopy
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ABSTRACT: The very neutronrich nucleus 20C has been investigated by inelastic scattering on 208Pb and liquid hydrogen targets. Through distorted wave analysis, the reduced electric quadrupole transition probability B(E2;0g.s.+→21+)<18.4 (stat) e2 fm4 and the neutron transition probability Mn2=292±52 (stat) fm4 have been derived. A simple shell model calculation has shown a need for a factor of about 0.4 decrease of the normal polarization charges to elucidate the results. This is interpreted as a decoupling of the valence neutrons from the nuclear core in carbon isotopes heavier than 14C.Physical Review C 01/2009; 79(1). DOI:10.1103/PhysRevC.79.011302 · 3.88 Impact Factor 
Article: Analysis on TwoNeutron Correlation Through Dalitz Plot of Coulomb Breakup Reaction for 6He
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ABSTRACT: A new method to describe the threebody decaying states is developed. In this method, the LippmannSchwinger equation is combined with the complex scaling method to take the correct boundary condition into account. For the application, the E1 transition strength of 6He is investigated. The energy and Dalitz distributions of the E1 transition are calculated, and the internal correlation of 6He is discussed. As results, it is found that the 6He > 5He(3/2)+n > 4He+n+n sequential decay process is dominant in the E1 transition reaction of 6He.International Journal of Modern Physics E 11/2008; 17(10):23682373. DOI:10.1142/S021830130801163X · 0.84 Impact Factor 
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ABSTRACT: We analyze alpha inelastic scattering on (12)C exciting the 0(2)(+) state at the incident energy of E(alpha)=240 MeV using the eikonal wave Born approximation and investigate what determines the oscillation pattern appearing in the inelastic angular distribution. We present an interpretation for the results obtained by the present author and his collaborator [Phys. Rev. C 74, 054606 (2006)] that the oscillation pattern in inelastic angular distribution is almost independent of the nuclear radius of (12)C(0(2)(+)).Physical Review C 07/2008; 78(1). DOI:10.1103/PhysRevC.78.014602 · 3.88 Impact Factor
Publication Stats
180  Citations  
83.73  Total Impact Points  
Top Journals
Institutions

2012

Hokkaido University
 Division of Physics
Sapporo, Hokkaidō, Japan


2009–2012

Osaka University
 • Graduate School of Medicine
 • Research Center for Nuclear Physics
Suita, Osakafu, Japan


2006–2008

Kyoto University
 Yukawa Institute for Theoretical Physics
Kyoto, Kyotofu, Japan


2005

RIKEN
Вако, Saitama, Japan


2003

Osaka City University
 Department of Physics
Ōsaka, Ōsaka, Japan
