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Kichiji Hatanaka

Bio: Kichiji Hatanaka is an academic researcher from Osaka University. The author has contributed to research in topics: Neutron & Elastic scattering. The author has an hindex of 39, co-authored 375 publications receiving 5555 citations. Previous affiliations of Kichiji Hatanaka include Petersburg Nuclear Physics Institute & Tokyo University of Agriculture and Technology.


Papers
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Journal ArticleDOI
TL;DR: The extracted E1 polarizability leads to a neutron skin thickness close to that of a neutron star, thereby constraining the symmetry energy and its density dependence relevant to the description of neutron stars.
Abstract: A benchmark experiment on Pb-208 shows that polarized proton inelastic scattering at very forward angles including 0 degrees is a powerful tool for high-resolution studies of electric dipole (E1) and spin magnetic dipole (M1) modes in nuclei over a broad excitation energy range to test up-to-date nuclear models. The extracted E1 polarizability leads to a neutron skin thickness r(skin) = 0.156(-0.021)(+0.025) fm in Pb-208 derived within a mean-field model [Phys. Rev. C 81, 051303 (2010)], thereby constraining the symmetry energy and its density dependence relevant to the description of neutron stars.

362 citations

Journal ArticleDOI
TL;DR: A high-resolution magnetic spectrometer called "Grand Raiden" is operated at the RCNP ring cyclotron facility in Osaka for nuclear physics studies at intermediate energies as discussed by the authors. But it is not suitable for high-dimensional data.
Abstract: A high-resolution magnetic spectrometer called “Grand Raiden” is operated at the RCNP ring cyclotron facility in Osaka for nuclear physics studies at intermediate energies. This magnetic spectrometer has excellent ion-optical properties. In the design of the spectrometer, the second-order dispersion matching condition has been taken into account, and almost all the aberration terms such as (x|θ 3 ), (x|θφ 2 ), (x|θ 2 δ) and (x|θδ2) in a third-order matrix calculation are optimized. A large magnetic rigidity of the spectrometer ( K = 1400 MeV) gives a great advantage to measure the charge-exchange (3He, t) reactions at 450 MeV. The ability of the high-resolution measurement has been demonstrated. Various coincidence measurements are performed to study the nuclear structures of highly excited states through decay properties of nuclear levels following nuclear reactions at intermediate energies.

167 citations

Journal ArticleDOI
TL;DR: In this article, a multipole decomposition technique is applied to the double differential cross sections to extract $L=0, $L = 1,$L=2, and $L < 3$ contributions.
Abstract: The double differential cross sections at ${\ensuremath{\theta}}_{\mathrm{lab}}$ between $0.0\ifmmode^\circ\else\textdegree\fi{}$ and $12.3\ifmmode^\circ\else\textdegree\fi{}$ and the polarization transfer ${D}_{\mathrm{NN}}$ at $0\ifmmode^\circ\else\textdegree\fi{}$ for the ${}^{90}\mathrm{Zr}(p,n)$ reaction are measured at a bombarding energy of 295 MeV. A multipole decomposition technique is applied to the cross sections to extract $L=0$, $L=1$, $L=2$, and $L=3$ contributions. The Gamow-Teller (GT) strength $B(\mathrm{GT})$ in the continuum deduced from the $L=0$ cross section is compared both with the perturbative calculation by Bertsch and Hamamoto and with the second-order random phase approximation calculation by Dro\ifmmode \dot{z}\else \.{z}\fi{}d\ifmmode \dot{z}\else \.{z}\fi{} et al. The sum of $B(\mathrm{GT})$ values up to 50 MeV excitation becomes ${S}_{{\ensuremath{\beta}}^{\ensuremath{-}}}$=28.0\ifmmode\pm\else\textpm\fi{}1.6 after subtracting the contribution of the isovector spin-monopole strength. This ${S}_{{\ensuremath{\beta}}^{\ensuremath{-}}}$ value of 28.0$\ifmmode\pm\else\textpm\fi{}$1.6 corresponds to about (93 $\ifmmode\pm\else\textpm\fi{}$ 5)% of the minimum value of the sum rule $3(N\ensuremath{-}Z)$=30. The usefulness of the polarization transfer observable in the distorted wave impulse approximation is presented.

146 citations

Journal ArticleDOI
TL;DR: In this article, the authors measured the angular distribution of the cross section, the proton analyzing power, and all proton polarization transfer coefficients at 250 MeV, compared with theoretical predictions based on exact solutions of the three nucleon Faddeev equations and modern realistic nucleon-nucleon potentials combined with three-Nucleon forces (3NF), namely, the Tucson-Melbourne (TM) $2.
Abstract: The angular distributions of the cross section, the proton analyzing power, and all proton polarization transfer coefficients of $\stackrel{\ensuremath{\rightarrow}}{p}d$ elastic scattering were measured at 250 MeV. The range of center-of-mass angles was $10\ifmmode^\circ\else\textdegree\fi{}--165\ifmmode^\circ\else\textdegree\fi{}$ for the cross section and the analyzing power, and about $10\ifmmode^\circ\else\textdegree\fi{}--95\ifmmode^\circ\else\textdegree\fi{}$ for the polarization transfer coefficients. These are the first measurements of a complete set of proton polarization observables for $\stackrel{\ensuremath{\rightarrow}}{p}d$ elastic scattering at intermediate energies. The present data are compared with theoretical predictions based on exact solutions of the three-nucleon Faddeev equations and modern realistic nucleon-nucleon potentials combined with three-nucleon forces (3NF), namely, the Tucson-Melbourne (TM) $2\ensuremath{\pi}$-exchange model, a modification thereof ${(\mathrm{T}\mathrm{M}}^{\ensuremath{'}}$) closer to chiral symmetry, and the Urbana IX model. Large effects of the three-nucleon forces are predicted. The inclusion of the three-nucleon forces gives a good description of the cross section at angles below the minimum. However, appreciable discrepancies between the data and predictions remain at backward angles. For the spin observables the predictions of the TM 3NF model deviate strongly from the other two 3NF models, which are close together, except for ${K}_{y}^{{y}^{\ensuremath{'}}}.$ In the case of the analyzing power all 3NF models fail to describe the data at the upper half of the angular range. In the restricted measured angular range the polarization transfer coefficients are fairly well described by the ${\mathrm{TM}}^{\ensuremath{'}}$ and Urbana IX 3NF models, whereas the TM 3NF model mostly fails. The transfer coefficient ${K}_{y}^{{y}^{\ensuremath{'}}}$ is best described by the Urbana IX but the theoretical description is still insufficient to reproduce the experimental data. These results call for a better understanding of the spin structure of the three-nucleon force and very likely for a full relativistic treatment of the three-nucleon continuum.

137 citations

Journal ArticleDOI
TL;DR: In this article, the isoscalar monopole and quadrupole strengths in the B 11 (d, d ) reaction at E d = 200 MeV were compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations.

93 citations


Cited by
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[...]

08 Dec 2001-BMJ
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

33,785 citations

Journal ArticleDOI
01 Apr 1988-Nature
TL;DR: In this paper, a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) is presented.
Abstract: Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

9,929 citations

01 Jan 2005
TL;DR: The Monthly Notices as mentioned in this paper is one of the three largest general primary astronomical research publications in the world, published by the Royal Astronomical Society (RAE), and it is the most widely cited journal in astronomy.
Abstract: Monthly Notices is one of the three largest general primary astronomical research publications. It is an international journal, published by the Royal Astronomical Society. This article 1 describes its publication policy and practice.

2,091 citations

Journal ArticleDOI
TL;DR: In this paper, the authors summarize the current knowledge of neutron-star masses and radii and show that the distribution of neutron star masses is much wider than previously thought, with three known pulsars now firmly in the 1.9-2.0-M⊙ mass range.
Abstract: We summarize our current knowledge of neutron-star masses and radii. Recent instrumentation and computational advances have resulted in a rapid increase in the discovery rate and precise timing of radio pulsars in binaries in the past few years, leading to a large number of mass measurements. These discoveries show that the neutron-star mass distribution is much wider than previously thought, with three known pulsars now firmly in the 1.9–2.0-M⊙ mass range. For radii, large, high-quality data sets from X-ray satellites as well as significant progress in theoretical modeling led to considerable progress in the measurements, placing them in the 10–11.5-km range and shrinking their uncertainties, owing to a better understanding of the sources of systematic errors. The combination of the massive-neutron-star discoveries, the tighter radius measurements, and improved laboratory constraints of the properties of dense matter has already made a substantial impact on our understanding of the composition and bulk p...

1,082 citations