A5083743252- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- X-ray Spectroscopy and Fluorescence Analysis
- Particle accelerators and beam dynamics
- Nuclear reactor physics and engineering
- Astro and Planetary Science
- Quantum Chromodynamics and Particle Interactions
- Advanced Chemical Physics Studies
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Superconducting Materials and Applications
- Advanced NMR Techniques and Applications
- Mass Spectrometry Techniques and Applications
- Quantum, superfluid, helium dynamics
- Italian Fascism and Post-war Society
- Particle Detector Development and Performance
- Historical Geopolitical and Social Dynamics
- Radioactive contamination and transfer
- Isotope Analysis in Ecology
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Radiation Therapy and Dosimetry
Institute for Basic Science
2016-2025
High Energy Accelerator Research Organization
2017-2018
Institute of Particle and Nuclear Studies
2017-2018
Wako University
2017
Chung-Ang University
2005-2016
Kyushu University
2013
Chonnam National University
2007
The new isotope U241 was synthesized and systematic atomic mass measurements of nineteen neutron-rich Pa-Pu isotopes were performed in the multinucleon transfer reactions U238+Pt198 system at KISS facility. present experimental results demonstrate crucial role for accessing unexplored actinide toward N=152 shell gap this region nuclides.Received 21 November 2022Revised 26 January 2023Accepted 16 February 2023DOI:https://doi.org/10.1103/PhysRevLett.130.132502© 2023 American Physical...
187Ta (𝑍=73, 𝑁=114) is located in the neutron-rich 𝐴≈190 region where a prolate-to-oblate shape transition via triaxial softness predicted to take place. A preceding work on 𝐾𝜋=(25/2−) isomer and rotational band which decays carried out by same collaboration revealed that axial symmetry slightly violated this nucleus. This paper focuses higher-lying isomer, was previously identified at 2933(14) keV mass measurements with Experimental Storage Ring GSI. The of interest has been populated...
It is a well-known fact that cluster of nucleons can be formed in the interior an atomic nucleus, and such clusters may occupy molecular-like orbitals, showing characteristics similar to normal molecules consisting atoms. Chemical having linear alignment are commonly seen nature, as carbon dioxide. A nuclear clusters, referred linear-chain state (LCCS), has been studied since 1950s, however, up now there no clear experimental evidence demonstrating existence state. Recently, it was proposed...
The atomic masses of ^{55}Sc, ^{56,58}Ti, and ^{56-59}V have been determined using the high-precision multireflection time-of-flight technique. radioisotopes produced at RIKEN's Radioactive Isotope Beam Factory (RIBF) delivered to novel designed gas cell system, which has recently commissioned downstream ZeroDegree spectrometer following BigRIPS separator. For ^{56,58}Ti ^{56-59}V, mass uncertainties reduced down order 10 keV, shedding new light on N=34 shell effect in Ti V isotopes by first...
Precise mass measurements of refractory nuclei produced by multinucleon transfer reactions a136Xe beam and natIr target were conducted at the KISS (KEK Isotope Separation System) facility, using a multireflection time-of-flight spectrograph. The study encompasses ions with numbers 𝐴=188,189,190,192, atomic 𝑍=74–79. Our findings show good agreement between evaluated masses, excluding 192Re, known values, within specified error margins. assessment includes reevaluation rejected value for 189W...
Abstract The cosmological lithium problem (CLP) stems from the outstanding discrepancy between theoretical predictions and astronomical observations of primordial abundances. For radiogenic production 7 Li, Be plays a pivotal role in Big Bang nucleosynthesis (BBN). Nevertheless, data for neutron-induced destruction processes were still sparse, especially lacked information on contributions transitions to Li excited states. In this work, we have determined <mml:math...
We present the first direct measurement of atomic mass a superheavy nuclide. Atoms $^{257}$Db ($Z$=105) were produced online at RIKEN Nishina Center for Accelerator-Based Science using fusion-evaporation reaction $^{208}$Pb($^{51}$V, 2n)$^{257}$Db. The gas-filled recoil ion separator GARIS-II was used to suppress both unreacted primary beam and some transfer products, prior delivering energetic ions helium stopping cell wherein they thermalized. Thermalized $^{257}$Db$^{3+}$ then transferred...
The masses of the exotic isotopes $^{210\ensuremath{-}214}\mathrm{Ac}$ and $^{210\ensuremath{-}214}\mathrm{Ra}$ have been measured with a multireflection time-of-flight mass spectrograph. These were obtained in flight as fusion-evaporation products behind gas-filled recoil ion separator GARIS-II at RIKEN. new direct measurements serve an independent benchmark for existing $\ensuremath{\alpha}\text{\ensuremath{-}}\ensuremath{\gamma}$ spectroscopy data this region. Further, anchor points are...
The magnetic dipole moment and mean-square charge radius of $^{199g}\mathrm{Pt}$ $({I}^{\ensuremath{\pi}}=$ $5/{2}^{\ensuremath{-}},{t}_{1/2}=30.8$ min) ground state $^{199m}\mathrm{Pt}$ $({E}_{\mathrm{ex}}=424$ keV, ${I}^{\ensuremath{\pi}}=$ (13/2)${}^{+},{t}_{1/2}=13.6$ s) isomeric are evaluated for the first time from investigations hyperfine splitting ${\ensuremath{\lambda}}_{1}=248.792$ nm transition by in-gas-cell laser ionization spectroscopy. Ground states neutron-rich...
The excited states in $^{22}\mathrm{Mg}$ have been investigated by the resonant elastic scattering of $^{21}\mathrm{Na}$$+p$. A 4.0 MeV/nucleon $^{21}\mathrm{Na}$ beam was separated Center for Nuclear Study (CNS) radioactive ion separator (CRIB) and then used to bombard a thick (CH${}_{2}$)${}_{n}$ target. energy spectra recoiled protons were measured at angles ${\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}\ensuremath{\approx}172{}^{\ensuremath{\circ}},146{}^{\ensuremath{\circ}}$,...
We performed in-gas-cell laser ionization spectroscopy of $^{194,196}\mathrm{Os}$, which were produced by multinucleon transfer reactions at the KEK Isotope Separation System (KISS). The nuclei interest identified through $\ensuremath{\beta}$-decay and a newly applied multireflection time-of-flight mass spectrograph (MRTOF-MS). From study resonance spectra, isotope shifts (ISs) transition ${\ensuremath{\lambda}}_{1}=247.758$ nm for $^{194}\mathrm{Os}$ $^{196}\mathrm{Os}$ measured first time....
The atomic masses of Ag111,113, Pd111–113, Rh111–113, Ru111–113, and Mo111,112 have been measured during the online commissioning experiments ZeroDegree multi-reflection time-of-flight Mass Spectrograph (ZD MRTOF-MS) at RIKEN RI beam factory. mass Mo112 has determined. For previously known masses, a good agreement between our results 2020 Atomic Evaluation observed in most cases. determined two-neutron separation energies for Mo isotopes up to N=70 show smooth trend. In this work, performed...
Proton resonant states in ${}^{27}$P were studied by the elastic scattering of ${}^{26}$Si+$p$ with a ${}^{26}$Si radioactive ion beam bombarding thick H${}_{2}$ gas target inverse kinematics method. The properties these resonance are important to better constrain production rates ${}^{26}$Si($p$,$\ensuremath{\gamma}$)${}^{27}$P reaction. This is one astrophysically reactions needed understand proton-rich nucleosynthesis such as galactic ${}^{26}$Al and energy generation explosive stellar...
The $^{14}\mathrm{O}(\ensuremath{\alpha},p)^{17}\mathrm{F}$ reaction is one of the key reactions involved in breakout from hot-CNO cycle to rp-process type-I x-ray bursts (XRBs). resonant properties compound nucleus $^{18}\mathrm{Ne}$ have been investigated through elastic scattering $^{17}\mathrm{F}+p$. radioactive $^{17}\mathrm{F}$ beam was separated by Center for Nuclear Study ion separator (CRIB) and bombarded a thick ${\mathrm{H}}_{2}$ gas target at 3.6 MeV/nucleon. recoiling light...
Hyperfine structure (HFS) measurements of neutron-rich iridium isotopes $^{196,197,198}\mathrm{Ir}$ ($Z=77,\phantom{\rule{0.16em}{0ex}}N=119$--121) were performed via in-gas-cell laser resonance ionization spectroscopy at the KEK Isotope Separation System. Magnetic dipole moments $\ensuremath{\mu}$ and isotope shifts determined from HFS spectra. The variation mean-square charge radii quadrupole deformation parameters these evaluated shifts. value $^{197}\mathrm{Ir}$ agreed with a theoretical...