A5049090861- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Advanced NMR Techniques and Applications
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Superconducting Materials and Applications
- Quantum, superfluid, helium dynamics
- Astronomical and nuclear sciences
- Advanced Chemical Physics Studies
- Nuclear reactor physics and engineering
- X-ray Spectroscopy and Fluorescence Analysis
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Therapy and Dosimetry
- Cardiac Valve Diseases and Treatments
- Mass Spectrometry Techniques and Applications
- Astro and Planetary Science
- High-pressure geophysics and materials
- Rare-earth and actinide compounds
- Dark Matter and Cosmic Phenomena
RIKEN Nishina Center
2015-2024
Sendai Medical Center
2021-2024
National Hospital Organization
2023-2024
The University of Tokyo
2011-2023
RIKEN
2005-2023
Saitama Cancer Center
2021
Kyushu University
2019
Bunkyo University
2003-2015
Saitama University
2009-2014
Osaka University
1984-2012
Precise measurements of deuteron vector and tensor analyzing powers ${A}_{y}^{d},$ ${A}_{\mathrm{xx}},$ ${A}_{\mathrm{yy}},$ ${A}_{\mathrm{xz}}$ in $d\ensuremath{-}p$ elastic scattering were performed via ${}^{1}\mathrm{H}(\stackrel{\ensuremath{\rightarrow}}{d},d)p$ ${}^{1}\mathrm{H}(\stackrel{\ensuremath{\rightarrow}}{d},p)d$ reactions at three incoming energies ${E}_{d}^{\mathrm{lab}}=140,$ 200, $270 \mathrm{MeV}.$ A wide range center-of-mass angles from...
The double differential cross sections at ${\ensuremath{\theta}}_{\mathrm{lab}}$ between $0.0\ifmmode^\circ\else\textdegree\fi{}$ and $12.3\ifmmode^\circ\else\textdegree\fi{}$ the polarization transfer ${D}_{\mathrm{NN}}$ $0\ifmmode^\circ\else\textdegree\fi{}$ for ${}^{90}\mathrm{Zr}(p,n)$ reaction are measured a bombarding energy of 295 MeV. A multipole decomposition technique is applied to extract $L=0$, $L=1$, $L=2$, $L=3$ contributions. Gamow-Teller (GT) strength $B(\mathrm{GT})$ in...
A candidate resonant tetraneutron state is found in the missing-mass spectrum obtained double-charge-exchange reaction ^{4}He(^{8}He,^{8}Be) at 186 MeV/u. The energy of 0.83±0.65(stat)±1.25(syst) MeV above threshold four-neutron decay with a significance level 4.9σ. Utilizing large positive Q value (^{8}He,^{8}Be) reaction, an almost recoilless condition system was achieved so as to obtain weakly interacting efficiently.
We perform the first direct mass measurements of neutron-rich calcium isotopes beyond neutron number 34 at RIKEN Radioactive Isotope Beam Factory by using time-of-flight magnetic-rigidity technique. The atomic excesses ^{55-57}Ca are determined for time to be -18650(160), -13510(250), and -7370(990) keV, respectively. examine emergence magicity N=34 based on new masses. masses provide experimental evidence appearance a sizable energy gap between 2p_{1/2} 1f_{5/2} orbitals in ^{54}Ca,...
The angular distributions of the cross section, proton analyzing power, and all polarization transfer coefficients $\stackrel{\ensuremath{\rightarrow}}{p}d$ elastic scattering were measured at 250 MeV. range center-of-mass angles was $10\ifmmode^\circ\else\textdegree\fi{}--165\ifmmode^\circ\else\textdegree\fi{}$ for section about $10\ifmmode^\circ\else\textdegree\fi{}--95\ifmmode^\circ\else\textdegree\fi{}$ coefficients. These are first measurements a complete set observables intermediate...
The cross section, the deuteron vector A(d)(y) and tensor analyzing powers A(ij), polarization transfer coefficients K(y('))(ij), induced P(y(')) were measured for dp elastic scattering at 270 MeV. section are well reproduced by Faddeev calculations with modern data-equivalent nucleon-nucleon forces plus Tucson-Melbourne three-nucleon force. In contrast, or not described such calculations. These facts indicate deficiencies in spin dependence of force call extended models.
The double-differential cross sections for the Ca48(p,n) and Ti48(n,p) reactions were measured at 300 MeV. A multipole decomposition technique was applied to spectra extract Gamow-Teller (GT) components. integrated GT strengths up an excitation energy of 30 MeV in Sc48 are 15.3±2.2 2.8±0.3 (p,n) (n,p) spectra, respectively. In additional found above 8 where shell models within fp shell-model space predict almost no strengths, suggesting that present description nuclear matrix element...
A new technique to measure $(p,n)$ charge-exchange reactions in inverse kinematics at intermediate energies on unstable isotopes was successfully developed and used study the $^{56}\mathrm{Ni}(p,n)$ reaction $110\text{ }\text{ }\mathrm{MeV}/\mathrm{u}$. Gamow-Teller transition strengths from $^{56}\mathrm{Ni}$ leading $^{56}\mathrm{Cu}$ were obtained compared with shell-model predictions $pf$ shell using KB3G GXPF1A interactions. The calculations interaction reproduce experimental strength...
Double differential cross sections between 0°–12° were measured for the 90Zr(n, p) reaction at 293 MeV over a wide excitation energy range of 0–70 MeV. A multipole decomposition technique was applied to present data as well previously obtained 90Zr(p, n) extract Gamow–Teller (GT) component from continuum. The GT quenching factor Q derived by using total strengths. result is Q=0.88±0.06, not including an overall normalization uncertainty in unit section 16%.
Three precise measurements for elastic $pd$ scattering at $135\text{ }\text{ }\mathrm{MeV}/A$ have been performed with the three different experimental setups. The cross sections are described well by theoretical predictions based on modern nucleon-nucleon forces combined three-nucleon forces. Relativistic Faddeev calculations show that relativistic effects restricted to backward angles. This result supports two recently reported RIKEN and contradicts KVI data.
The differential cross sections and vector analyzing powers for nd elastic scattering at En=248 MeV were measured 10°–180° in the center-of-mass (c.m.) system. To cover wide angular range, experiments performed separately by using two different setups forward backward angles. data are compared with theoretical results based on Faddeev calculations realistic nucleon-nucleon (NN) forces such as AV18, CD Bonn, Nijmegen I II, their combinations three-nucleon (3NFs), Tucson-Melbourne 99 (TM99),...
Ab‐initio calculations of light nuclei require three‐nucleon potentials in addition to realistic two‐nucleon forces obtain the empirical binding energies. The current status Illinois used with Argonne v18 is presented.
Spin-isospin excitations in $^{208}\mathrm{Bi}$ have been investigated using the $^{208}\mathrm{Pb}$ ${(}^{3}$He,t${)}^{208}$Bi reaction at near \ensuremath{\theta}\ensuremath{\approxeq}0\ifmmode^\circ\else\textdegree\fi{} E${(}^{3}$He)=450 MeV. The microscopic structure of Gamow-Teller resonance (GTR), isobaric analog state (IAS), and spin-flip dipole (\ensuremath{\Delta}L=1) (SDR) has studied by observing their direct proton decays to low-lying neutron-hole states $^{207}\mathrm{Pb}$....
New vector analyzing-power data on $\stackrel{\ensuremath{\rightarrow}}{p}+d$ elastic scattering at ${E}_{p}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}150$ and $190\mathrm{MeV}$ have been measured. These are presented together with existing recent $\stackrel{\ensuremath{\rightarrow}}{d}+p$ tensor analyzing power ${E}_{d}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}270\mathrm{MeV}$. The strong negative extremum of both powers ${A}_{y}^{p}$ ${A}_{y}^{d}$...
The deuteron to proton polarization transfer coefficients for the $d$--$p$ elastic scattering were precisely measured with an incoming energy of 135 MeV/u at RIKEN Accelerator Research Facility. data are compared theoretical predictions based on exact solutions three-nucleon Faddeev equations high--precision nucleon--nucleon forces combined different (3NFs), representing current, most popular models: $2\pi$-exchange Tucson-Melbourne model, a modification thereof closer chiral symmetry...
We report the results of first-time test local hidden variable theories (Bell-Clauser-Horne-Shimony-Holt) involving strongly interacting pairs massive spin $1/2$ hadrons from decay short-lived ($\ensuremath{\tau}<{10}^{\ensuremath{-}21}\mathrm{sec}$) $^{2}\mathrm{He}$ spin-singlet state, populated in nuclear reaction $^{2}\mathrm{H}+^{1}\mathrm{H}\ensuremath{\rightarrow}^{2}\mathrm{He}+n$. The novel features this experiment are (a) use an ``event-ready'' detector nearly 100% efficiency...
The vector analyzing power has been measured for the elastic scattering of neutron-rich 6He from polarized protons at 71 MeV/nucleon making use a newly constructed solid proton target operated in low magnetic field and high temperature. Two approaches based on local one-body potentials were applied to investigate spin-orbit interaction between nucleus. An optical model analysis revealed that potential is characterized by shallow long-ranged shape compared with global systematics stable...
The dependence of the single-particle strength on difference between proton and neutron separation energies is studied for oxygen isotopes in a wide range isospins. cross sections quasi-free (|$p,2p$|) reaction |$^{14,16,18,22,24}$|O were measured at intermediate energies. are compared to predictions based distorted wave impulse approximation shell-model |$psd$| valence-space spectroscopic factors. reduction factors, which ratio experimental theoretical predictions, show no apparent...
The key parameter to discuss the possibility of pion condensation in nuclear matter, i.e., so-called Landau-Migdal g^{'}, was extracted by measuring double-differential cross sections for (p,n) reaction at 216 MeV/u on a neutron-rich doubly magic unstable nucleus, ^{132}Sn with quality comparable data taken stable nuclei. strengths Gamow-Teller (GT) transitions from leading ^{132}Sb exhibit GT giant resonance (GTR) excitation energy 16.3±0.4(stat)±0.4(syst) MeV width Γ=4.7±0.8 MeV....
The excitation functions for quasielastic scattering of ^{22}Ne+^{248}Cm, ^{26}Mg+^{248}Cm, and ^{48}Ca+^{238}U are measured using a gas-filled recoil ion separator. barrier distributions extracted these systems compared with coupled-channel calculations. results indicate that the distribution is affected dominantly by deformation actinide target nuclei, but also vibrational or rotational excitations projectile as well neutron transfer processes before capture. From comparison between...
Abstract The RIKEN Nishina Center (RNC) executed an accelerator upgrade project for the heavy-ion linac (called RILAC). A superconducting linear (SRILAC) and a new electron-cyclotron-resonance ion source (SC-ECRIS) to boost final energy intensity were constructed, aimed at synthesizing superheavy element, 119, through hot fusion reaction. included construction of gas-filled recoil separator (GARIS-III) suitable detecting residues hot-fusion To avoid research interruption during SRILAC period...
The quasielastic barrier distribution of 51V+248Cm was extracted by measuring the excitation function backscattering using a gas-filled recoil ion separator, GARIS-III. obtained is well explained coupled-channels calculation, indicating significant effect rotational deformed 248Cm. From measured average Coulomb height and deformation parameters 248Cm, side-collision energy leading to compact configuration colliding nuclei obtained. relation between side collision evaporation-residue cross...
This study presents an experimental method to investigate the effects of side-collision configurations observed in synthesis superheavy nuclei, using lighter, deformed lanthanide targets. The research extends systematic studies reactions involving beams heavier than 48 Ca on Measurements both entrance-channel barrier distribution and detailed excitation functions for x n, p α n channels, over a wide energy range, are provided 51 V+ 159 Tb system.