Publications (132)204.57 Total impact
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ABSTRACT: Differential cross sections of isoscalar and isovector spinM1 (0 þ → 1 þ) transitions are measured using highenergyresolution proton inelastic scattering at E p ¼ 295 MeV on 24 Mg, 28 Si, 32 S, and 36 Ar at 0°–14°. The squared spinM1 nuclear transition matrix elements are deduced from the measured differential cross sections by applying empirically determined unit cross sections based on the assumption of isospin symmetry. The ratios of the squared nuclear matrix elements accumulated up to E x ¼ 16 MeV compared to a shellmodel prediction are 1.01(9) for isoscalar and 0.61(6) for isovector spinM1 transitions, respectively. Thus, no quenching is observed for isoscalar spinM1 transitions, while the matrix elements for isovector spinM1 transitions are quenched by an amount comparable with the analogous GamowTeller transitions on those target nuclei.Physical Review Letters 09/2015; 115(10):102501. DOI:10.1103/PhysRevLett.115.102501 · 7.51 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The review of the recent results on spin effects in few nucleon systems obtained at LHEPJINR are presented. The data on the deuteron analyzing powers in different reactions in the wide energy range demonstrate the sensitivity to the spin structure of the light nuclei. The future plans on the studies with polarized deuterons from new polarized ion source at Nuclotron will be reported.Physics of Particles and Nuclei 01/2014; 45(1):327329. DOI:10.1134/S1063779614010560 · 0.62 Impact Factor  Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 11/2013; 729:922923. DOI:10.1016/j.nima.2013.08.049 · 1.22 Impact Factor
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ABSTRACT: We have developed a monitoring system dedicated for heavyion cyclotrons that incorporates lockin amplifiers (LIAs) that can measure the beam phase of signals from phase probe with an amplitude of a few hundred nanovolts. We have compared the performance of the LIA system with that of a conventional system that incorporates oscilloscopes (OSCs). It was confirmed that the LIA system has a much higher precision than the OSC system by the measurement with a wide dynamic range of beam current. Isochronism measurements for a ring cyclotron with a low velocity gain (1.5) were made using both systems and excellent agreement was found between them. However there was a discrepancy between the beam phase measurements using the OSC system and the LIA system, for the case of a ring cyclotron with a high velocity gain of 4.0. It turned out due to a large radial variation of the phase width of circulating beam bunch according to a radial distribution of the acceleration voltage. It was also confirmed that the cable dispersion disturbs the beamphase measurement using OSC system.Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 11/2013; 729:788799. DOI:10.1016/j.nima.2013.08.056 · 1.22 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: A new injector linac “RILAC2”, has recently been constructed at the RIKEN RI Beam Factory. The main part of the RILAC2 is a drift tube linac that consists of three newly designed cavities. These cavities operate in continuous wave (CW) mode at a fixed frequency of 36.5 MHz. Their structure is based on a quarterwavelength resonator because this is the smallest resonator available in this frequency range among the available structures. We adopted the direct coupling method in the construction of these cavities. A power amplifier was directly coupled to the cavity without a long transmission line to reduce the installation area and simultaneously reduce construction cost. A detailed cavity and coupler design was carried out via simulation. Our work also describes the design process using threedimensional electromagnetic simulation software. Construction and operation tests are also shown.Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 09/2013; 722:55–64. DOI:10.1016/j.nima.2013.04.007 · 1.22 Impact Factor 
Article: Analyzing Power in Elastic Scattering of Polarized Protons from Neutronrich Helium Isotopes
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ABSTRACT: The vector analyzing power has been measured for the elastic scattering of neutronrich 6He from polarized protons at 71 MeV/nucleon. Two approaches based on local onebody potentials were applied to investigate the spinorbit interaction between a proton and a 6He nucleus. An optical model analysis revealed that the spinorbit potential for 6He is characterized by a shallow and longranged shape compared with the global systematics of stable nuclei. A semimicroscopic analysis with a α + n + n cluster folding model suggests that the inclusion of realistic interaction between a proton and the α core is important in describing the p6He elastic scattering.FewBody Systems 08/2013; 54(710). DOI:10.1007/s0060101306171 · 0.77 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: A complete set of analyzing powers for the dd>3Hp reaction at the kinetic beam energy of 200 MeV has been measured in the full angular range in the c.m. frame. The observed signs of the tensor analyzing powers Ayy, Axx, and Axz at forward and backward directions have clearly demonstrated the sensitivity to the ratio of the D and Swave components of the triton and deuteron, respectively. The new highprecision data are compared with the prediction of the relativistic multiplescattering model by using standard wave functions of the threenucleon bound state and of the deuteron.Physical Review C 05/2013; 87(5). DOI:10.1103/PhysRevC.87.051001 · 3.73 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The GamowTeller (GT) strength distribution has been investigated in a highresolution (3He,t) chargeexchange experiment on the doublebeta (ββ) decaying nucleus 96Zr. The experiment was carried out at the Osaka University Research Center for Nuclear Physics (RCNP) with a 420 MeV incident 3He beam and the Grand Raiden magnetic spectrometer. A finalstate energy resolution of 32 keV was achieved. A large fraction of the lowenergy GT− strength is identified in a single state at 694 keV. A similar observation has been made in a 96Mo(d,2He)96Nb experiment at 120 keV resolution for the GT+ strength. It is found that this single state makes up nearly 100% of the nuclear matrix element for the 96Zr twoneutrino doublebeta (2νββ) decay.Physical Review C 11/2012; 86(5). DOI:10.1103/PhysRevC.86.054323 · 3.73 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The GamowTeller (GT) strength distribution has been investigated in a highresolution (3He,t) chargeexchange experiment on the doublebeta (ββ) decaying nucleus 100Mo. The experiment was carried out at the Osaka University Research Center for Nuclear Physics (RCNP) with a 420 MeV incident 3He beam and the Grand Raiden magnetic spectrometer. A finalstate energy resolution of 33 keV was achieved. It was found that nearly the entire lowenergy (up to ≈4 MeV) GT− strength is concentrated in the groundstate transition to 100Tc, which is interpreted as a result of the particular neutron and proton subshell occupancies. The impact on the matrix elements for the twoneutrino doublebeta (2νββ) decay and the use of 100Mo as a neutrino detection material is discussed.Physical Review C 10/2012; 86(4). DOI:10.1103/PhysRevC.86.044309 · 3.73 Impact Factor 
Article: Measurement of the vector and tensor analyzing powers for dp elastic scattering at 880 MeV
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ABSTRACT: The vector Ay and tensor analyzing powers Ayy and Axx for dp elastic scattering were measured at Td = 880 MeV over the c.m. angular range from 60 to 140 degrees at the JINR Nuclotron. The data are compared with predictions of different theoretical models based on the use of nucleonnucleon forces only. The observed discrepancies of the measured analyzing powers from the calculations require the consideration of additional mechanisms.Physics Letters B 07/2012; 715(s 1–3). DOI:10.1016/j.physletb.2012.07.022 · 6.13 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: A 76Ge(3He,t)76As chargeexchange experiment at an incident energy of 420 MeV has been performed with an energy resolution of 30 keV. The GamowTeller GT− strength distribution in 76As, which is the intermediate nucleus in the doublebeta (ββ) decay of 76Ge, has been extracted. An unusually strong fragmentation of the GT− strength is observed even at low excitation energies of Ex⩽5 MeV. By combining the data with those for GT+ transitions from a recent 76Se(d,2He)76As measurement, the nuclear matrix element for the 76Ge 2νββ decay has been evaluated. A lack of correlation among the GT transition strengths feeding the same levels from the two different directions is observed. The impact on the 76Ge 2νββ decay nuclear matrix element is discussed.Physical Review C 07/2012; 86(1). DOI:10.1103/PhysRevC.86.014304 · 3.73 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: A gas target system has been developed for nuclear scattering experiments with a highly dispersive spectrometer at small scattering angles including 0°. The system is equipped with a gas cell that has a wide beam window of 44 mm in width and 14 mm in height. The size is sufficient to pass a dispersed beam, which is essential for high energyresolution measurement. A gas handling system allows target gas that is often limited in quantity, to be collected for reuse. Typical areal density is 1 mg/cm2 for 20Ne or 36Ar gas. The target can be operated either at room temperature or at the liquid nitrogen temperature. The gas target has been employed in a proton inelasticscattering experiment at 295 MeV with the Grand Raiden spectrometer at the Research Center for Nuclear Physics. A good energy resolution of 20 keV (FWHM) has been achieved at scattering angles of 0–4.5°.Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 06/2012; 678:122–129. DOI:10.1016/j.nima.2012.03.005 · 1.22 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The experiment with polarized deuteron beam was performed at energies 140, 200 and 270 MeV at RIKEN, Japan, in December 2000. The highmomentum structure of the 3He, 3H and deuteron was investigated. For this purpose the angular dependence of the tensor and vector analyzing powers were measured for the reactions d+d→3H+p and d+d→3He+n. In this report the results on the tensor Axx, Ayy and vector Ay analyzing powers at 270 MeV are presented.International Journal of Modern Physics A 05/2012; 20(02n03). DOI:10.1142/S0217751X05022044 · 1.70 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The data on the vector Ay and tensor Ayy, Axx, Axz analyzing powers for the and reactions at Ed = 200 and 270 MeV are presented. The data demonstrate large values of analyzing powers and their strong variation versus the scattering angle. The observed negative sign of the tensor analyzing powers for these reactions at small angles clearly demonstrate the sensitivity to the D/S ratio of the 3H and 3He wave functions, respectively. The calculations performed within onenucleon exchange model with the use of the standard threenucleon bound state wave functions fail to reproduce the data on the tensor analyzing powers.International Journal of Modern Physics A 01/2012; 24(02n03). DOI:10.1142/S0217751X09043997 · 1.70 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: Analyzing powers measurement Ay, Ayy and Axx for the d  p elastic scattering were performed at the Internal Target Station of Nuclotron at JINR at Ed = 880 and 2000 MeV. These data are necessary to obtain the information on the 3NF structure and the relativistic effects. They are also important for development of the efficient deuteron beam polarimetry at high energies. The results of the analyzing powers at Ed = 880 MeV covered the angular range from 60 to 140° in the c.m.s. are compared with several theoretical calculations. The preliminary data on the analyzing powers measurement Ay, Ayy at Ed = 2000 MeV are discussed.International Journal of Modern Physics A 01/2012; 24(02n03). · 1.70 Impact Factor 
Article: CLUSTER STATES IN 13C AND 11B
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ABSTRACT: The cluster structures of the excited states in 11B and 13C were discussed by measuring the isoscalar monopole strengths in the inelastic α scattering at Eα = 388 MeV. It was found that the , , and states in 13C are candidates for the α cluster states with a 3α + n molecular configuration.International Journal of Modern Physics E 01/2012; 17(10). DOI:10.1142/S0218301308011112 · 1.34 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: New polarimeter based on the asymmetry measurement in dpelastic scattering has been constructed at internal target at Nuclotron (JINR). The result on the deuteron analyzing powers A y , A yy and A xx in the deuteronproton (dp) elastic scattering at the energies of 880 and 2000 MeV are presented. They are compared with different theoretical approaches.Physics of Particles and Nuclei Letters 12/2011; 8(10). DOI:10.1134/S1547477111100128  [Show abstract] [Hide abstract]
ABSTRACT: The results on the vector A y and tensor A yy , A xx and A xz analyzing powers of the $\vec dd \to {}^3Hen$ and $\vec dd \to {}^3Hp$ reactions obtained at intermediate energies at RARF(RIKEN, Japan) are presented. The high precision experimental data are compared with the theoretical calculation within the one nucleon exchange model by using standard 3He, 3H and deuteron wave functions. The data demonstrate the sensitivity to the shortrange 3He, 3H and deuteron spin structure.Physics of Particles and Nuclei Letters 12/2011; 8(10). DOI:10.1134/S1547477111100116  [Show abstract] [Hide abstract]
ABSTRACT: Measurements of the tensor and vector analyzing powers Ayy, Axx, Axz, and Ay for the and reactions were performed at Ed = 270 and 200 MeV over wide angular range. T20 at θcm = 0° and 180° were also measured at Ed = 270, 200, and 140 MeV. Obtained data were compared with predictions based on one nucleon exchange approximation.Modern Physics Letters A 11/2011; 18(02n06). · 1.20 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The cross sections and spin observables of the p+d elastic scattering have been measured at 392 MeV. The results are compared with the results of Faddeev calculations with and without including the three nucleon force.Modern Physics Letters A 11/2011; 18(02n06). · 1.20 Impact Factor
Publication Stats
820  Citations  
204.57  Total Impact Points  
Top Journals
Institutions

2008–2013

RIKEN
 Nishina Center for AcceleratorBased Science (RNC)
Вако, Saitama, Japan


2006–2012

Wako University
Saitama, Saitama, Japan


2001–2012

Osaka University
 Research Center for Nuclear Physics
Suika, Ōsaka, Japan


2004–2011

The University of Tokyo
 Department of Physics
白山, Tōkyō, Japan


1999–2011

Saitama University
 Department of Physics
Saitama, Saitama, Japan
