H. Iwasaki
A5066533044- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Quantum Chromodynamics and Particle Interactions
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Quantum, superfluid, helium dynamics
- Superconducting Materials and Applications
- Astro and Planetary Science
- X-ray Spectroscopy and Fluorescence Analysis
- Rare-earth and actinide compounds
- Particle physics theoretical and experimental studies
- Radiopharmaceutical Chemistry and Applications
- Inorganic Fluorides and Related Compounds
- Boron Compounds in Chemistry
- Neutrino Physics Research
- Plasma Diagnostics and Applications
- ZnO doping and properties
- Stellar, planetary, and galactic studies
- Muon and positron interactions and applications
- Mass Spectrometry Techniques and Applications
Michigan State University
2014-2024
Musashino Art University
2022
Joint Institute for Nuclear Astrophysics
2022
National Superconducting Cyclotron Laboratory
2010-2021
Kyoto University
2018
University of Cologne
2008-2016
Université Paris-Sud
2009-2013
Centre National de la Recherche Scientifique
2009-2013
The University of Tokyo
2003-2013
Astronomy and Space
2011-2013
The extremely neutron-rich nucleus ${}^{19}\mathrm{C}$ has been studied by Coulomb dissociation into ${}^{18}\mathrm{C}+n$ at $67A\mathrm{MeV}$. A large $E1$ strength of $0.71\ifmmode\pm\else\textpm\fi{}0.07{e}^{2}\mathrm{fm}{}^{2}$ observed low excitation energies. An analysis the angular distribution center mass led to a determination neutron separation energy be $530\ifmmode\pm\else\textpm\fi{}130\mathrm{keV}$. can well reproduced for ground state structure with dominant $s$-wave valence...
Breakup reactions of the one-neutron halo nucleus 11Be on Pb and C targets at about 70 MeV/u have been investigated by measuring momentum vectors incident 11Be, outgoing 10Be, neutron in coincidence. The relative energy spectra as well angular distributions 10Be+n center mass extracted for both targets. For breakup target, selection forward scattering angles is found to be effective extract almost purely first-order E1 Coulomb component, exclude nuclear contribution higher-order components....
The energy of the first excited state very neutron-rich nucleus 30Ne was determined by proton inelastic scattering. A liquid hydrogen target bombarded a beam radioactive at 48 MeV/nucleon, and energies de-excitation γ rays emitted from were measured. observed transition is likely to be one 2+ ground 30Ne. excitation energy, 791(26) keV, lower than that 32Mg, indicating enhancement deformation as neutron excess increases in N=20 isotones. results indicate belongs 'island inversion'.
The transition rates for the 2+1 states in 62,64,66Fe were studied using recoil distance Doppler-shift technique applied to projectile Coulomb excitation reactions. deduced E2 strengths illustrate enhanced collectivity of neutron-rich Fe isotopes up N=40. results are interpreted generalized concept valence proton symmetry which describes evolution nuclear structure around N=40 as governed by number protons with respect Z≈30. trend suggested experimental data is described state-of-the-art...
The electric quadrupole transition from the first 2(+) state to ground 0(+) in 16C is studied through measurement of lifetime by a recoil shadow method applied inelastically scattered radioactive nuclei. measured mean 77+/-14(stat)+/-19(syst) ps. central value corresponds B(E2;2+(1)-->0(+)) 0.63e(2) fm(4), or 0.26 Weisskopf units. strength found be anomalously small compared empirically predicted value.
Neutron single particle energies have been measured in 23O using the 22O(d,p)23O*-->22O+n process. The of resonant states deduced to be 4.00(2) MeV and 5.30(4) MeV. first excited state can assigned nu d3/2 from a comparison with shell model calculations. 4.0 energy difference between s1/2 gives size N=16 gap which is agreement recent USD05 ("universal" sd 2005) calculation, large enough explain unbound nature oxygen isotopes heavier than A=24. resonance detected at 5.3 out space. Its...
The neutron capture reaction on $^{14}\mathrm{C}$ leading to the $^{15}\mathrm{C}$ ground state, which plays an important role in various nucleosynthesis processes, has been studied using Coulomb breakup of a Pb target at 68 MeV/nucleon. cross section converted into energy-dependent principle detailed balance. energy spectrum shows typical $p$-wave characteristics, is explained by fact that state possesses strong single-particle $s$-wave component and moderate-sized halo structure. for...
An excited state in the proton-rich unbound nucleus $^{12}\mathrm{O}$ was identified at 1.8(4) MeV via missing-mass spectroscopy with $^{14}\mathrm{O}(p,t)$ reaction $51\text{ }\text{ }A\mathrm{MeV}$. The spin-parity of determined to be ${0}^{+}$ or ${2}^{+}$ by comparing measured differential cross sections distorted-wave calculations. lowered location indicates breakdown major shell closure $Z=8$ near proton drip line. This demonstrates persistence mirror symmetry disappearance magic...
The transition rates from the yrast ${2}^{+}$ and ${4}^{+}$ states in self-conjugate $^{72}\mathrm{Kr}$ nucleus were studied via lifetime measurements employing GRETINA array with a novel application of recoil-distance method. large collectivity observed for ${4}^{+}\ensuremath{\rightarrow}{2}^{+}$ suggests prolate character excited states. reduced previously reported ${2}^{+}\ensuremath{\rightarrow}{0}^{+}$ was confirmed. irregular behavior points to occurrence rapid oblate-prolate shape...
The electric quadrupole transition from the first ${2}^{+}$ state to ground ${0}^{+}$ in $^{18}\mathrm{C}$ was studied through a lifetime measurement by an upgraded recoil shadow method applied inelastically scattered radioactive nuclei. measured mean is $18.9\ifmmode\pm\else\textpm\fi{}0.9(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}4.4(\mathrm{syst})$ ps, corresponding $B$($E2;{2}_{1}^{+}\ensuremath{\rightarrow}{0}_{\mathrm{g}.\mathrm{s}.}^{+}$) value of...
The structure of neutron-rich isotopes 60Cr and 62Cr was studied via proton inelastic scattering in inverse kinematics. deformation lengths (delta) for were extracted as 1.12(16) 1.36(14) fm, respectively, providing evidence enhanced collectivity these nuclei. An excited state at 1180(10) keV identified the first time. We adopted 4;{+} its spin parity, leading to rapid increase Ex(4;{+})/E_{x}(2;{+}) ratio, which indicates development large near N=40. Importance admixture gd-shell component...
A β-decaying high-spin isomer in (96)Cd, with a half-life T(1/2)=0.29(-0.10)(+0.11) s, has been established stopped beam rare isotope spectroscopic investigations at GSI (RISING) experiment. The nuclei were produced using the fragmentation of primary (124)Xe on (9)Be target. From and observed γ decays daughter nucleus, (96)Ag, we conclude that state is long predicted 16(+) "spin-gap" isomer. Shell-model calculations, Gross-Frenkel interaction πν(p(1/2),g(9/2)) model space, show isoscalar...
We present a novel technique for studying the quenching of shell gaps in exotic isotopes. The method is based on extracting Gamow-Teller ($\ensuremath{\Delta}L=0$, $\ensuremath{\Delta}S=1$) transition strengths [$B(\mathrm{GT})$] to low-lying states from charge-exchange reactions at intermediate beam energies. These are very sensitive configuration mixing between cross-shell orbitals, and this thus provides an important complement other tools currently used study mixing. This work focuses...
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...
17,19C nuclei have been investigated by proton inelastic scattering on a liquid hydrogen target at intermediate energies. Two peaks were observed in the Doppler-corrected γ-ray spectra with energies of 210(6), 331(6) keV 17C and 72(4), 197(6) 19C corresponding to decay two excited states both nuclei. Analyzing reaction cross sections, tentative spin values determined for states. The experimental results are reasonable agreement predictions shell model calculations.
The 0g.s.+→21+ excitation of the neutron-rich nucleus 28Ne has been investigated via heavy-ion inelastic scattering in reversed kinematics. B(E2;0g.s.+→21+) value was determined to be 132(23)e2fm4, which is smaller than expected from low energy first 21+ state. A comparison with theoretical predictions suggests that suppressed collectivity characteristic nuclei lying on boundary 'island inversion'.