A5079511034- Nuclear Physics and Applications
- Nuclear physics research studies
- Atomic and Molecular Physics
- Mass Spectrometry Techniques and Applications
- Spectroscopy and Laser Applications
- Laser Design and Applications
- Advanced Fiber Laser Technologies
- Atomic and Subatomic Physics Research
- Radioactive contamination and transfer
- Neutrino Physics Research
- Laser-Matter Interactions and Applications
- Photonic Crystal and Fiber Optics
- Radiation Detection and Scintillator Technologies
- Ion-surface interactions and analysis
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Advanced Fiber Optic Sensors
- Radioactive element chemistry and processing
- Isotope Analysis in Ecology
- Astronomical and nuclear sciences
- Solid State Laser Technologies
- Quantum, superfluid, helium dynamics
- Laser-induced spectroscopy and plasma
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear Materials and Properties
University of Jyväskylä
2012-2023
Nagoya University
2015-2023
HÜBNER Group (Germany)
2023
IMT Atlantique
2022
Nantes Université
2022
Institut National de Physique Nucléaire et de Physique des Particules
2022
Centre National de la Recherche Scientifique
2022
Japan Atomic Energy Agency
2020
Universitat de València
2017-2020
Instituto de Física Corpuscular
2017-2020
Abstract Resonant laser ionization and spectroscopy are widely used techniques at radioactive ion beam facilities to produce pure beams of exotic nuclei measure the shape, size, spin electromagnetic multipole moments these nuclei. However, in such measurements it is difficult combine a high efficiency with spectral resolution. Here we demonstrate on-line application atomic supersonic gas jet, technique suited for high-precision studies ground- isomeric-state properties located extremes...
Atomic masses of the neutron-rich isotopes $^{121--128}\mathrm{Cd}$, $^{129,131}\mathrm{In}$, $^{130--135}\mathrm{Sn}$, $^{131--136}\mathrm{Sb}$, and $^{132--140}\mathrm{Te}$ have been measured with high precision (10 ppb) using Penning-trap mass spectrometer JYFLTRAP. Among these, four $r$-process nuclei $^{135}\mathrm{Sn}$, $^{136}\mathrm{Sb}$, $^{139,140}\mathrm{Te}$ were for first time. An empirical neutron pairing gap expressed as odd-even staggering isotopic shows a strong quenching...
The double Penning trap mass spectrometer JYFLTRAP has been employed to measure masses and excitation energies for $11/{2}^{\ensuremath{-}}$ isomers in ${}^{121}$Cd, ${}^{123}$Cd, ${}^{125}$Cd, ${}^{133}$Te, $1/{2}^{\ensuremath{-}}$ ${}^{129}$In ${}^{131}$In, ${7}^{\ensuremath{-}}$ ${}^{130}$Sn ${}^{134}$Sb. These first direct measurements of the Cd In reveal deviations based on results from $\ensuremath{\beta}$-decay experiments yield new information neutron- proton-hole states close...
We investigate the decay of $^{87,88}\mathrm{Br}$ and $^{94}\mathrm{Rb}$ using total absorption $\ensuremath{\gamma}$-ray spectroscopy. These important fission products are $\ensuremath{\beta}$-delayed neutron emitters. Our data show considerable $\ensuremath{\beta}\ensuremath{\gamma}$ intensity, so far unobserved in high-resolution spectroscopy, from states at high excitation energy. also find significant differences with $\ensuremath{\beta}$ intensity that can be deduced existing...
Total absorption spectroscopy is used to investigate the β-decay intensity states above neutron separation energy followed by γ-ray emission in (87,88)Br and (94)Rb. Accurate results are obtained thanks a careful control of systematic errors. An unexpectedly large γ observed all three cases extending well beyond excitation region where penetration hindered low energy. The branching as function compared Hauser-Feshbach model calculations. For (87)Br (88)Br reaches 57% 20%, respectively, could...
A high repetition rate pulsed Ti:sapphire laser injection-locked to a continuous wave seed source is presented. spectral linewidth of 20 MHz at an average output power 4 W demonstrated. An enhanced tuning range from 710–920 nm with single broadband mirror set realized by the inclusion thin birefringent quartz plate for suppression unseeded emission. The properties have been analyzed using both scanning Fabry–Pérot interferometer as well crossed beam resonance ionization spectroscopy...
The mass of $^{31}\mathrm{S}$ has been measured with the JYFLTRAP double Penning trap spectrometer. new excess value $\ensuremath{-}19 042.55(24) \mathrm{keV}$ deviates from adopted 044.6(15) by $1.4\ensuremath{\sigma}$. $^{32}\mathrm{Cl}$ revised result and latest data $\ensuremath{\beta}$-delayed proton decay $^{32}\mathrm{Cl}$. for is $\ensuremath{-}13 334.88(65) \mathrm{keV}$, which most precise so far in agreement recent ($^{3}\mathrm{He},t$) data. isobaric multiplet equation tested...
The beta decays of $^{86}\mathrm{Br}$ and $^{91}\mathrm{Rb}$ have been studied using the total absorption spectroscopy technique. radioactive nuclei were produced at Ion Guide Isotope Separator On-Line facility in Jyv\"askyl\"a further purified JYFLTRAP. are considered to be major contributors decay heat reactors. In addition, was used as a normalization point direct measurements mean gamma energies released fission products by Rudstam et al. assuming that this well known from...
Laser spectroscopic studies on minute samples of exotic radioactive nuclei require very efficient experimental techniques. In addition, high resolving powers are required to allow extraction nu- clear structure information. Here we demonstrate that by using weak atomic transitions, resonance laser ionization spectroscopy is achieved with the efficiency (1-10%) and precision (linewidths tens MHz). We illustrate experimentally through use simulations how narrow linewidths distorted spec-...
Even mass neutron-rich niobium isotopes are among the principal contributors to reactor antineutrino energy spectrum. They also most challenging measure due refractory nature of niobium, and because they exhibit isomeric states lying very close in energy. The β-intensity distributions Nb100gs,100m Nb102gs,102m β decays have been determined using total absorption γ-ray spectroscopy technique. measurements were performed at upgraded Ion Guide Isotope Separator On-Line facility University...
The in-gas laser ionization and spectroscopy (IGLIS) technique was applied on the $^{212--215}\mathrm{Ac}$ isotopes, produced at Leuven Isotope Separator On-Line (LISOL) facility by using in-gas-cell in-gas-jet methods. first application under on-line conditions of method showed a superior performance in terms selectivity, spectral resolution, efficiency comparison with method. Following analysis both experiments, magnetic-dipole moments for electric-quadrupole nuclear spins...
A compact cavity ring-down spectrometer aimed at the detection of trace amounts radiocarbon (14C) in biomedical samples is demonstrated. Rapid sampling, as required for large scale studies, made possible by modifications to a CHNS elemental analyzer. After conversion carbon content sample into CO2, spectral analysis using high-finesse conjunction with quantum cascade laser system reveals ratio 14CO2 relation stable isotopologues 12C and 13C. Cooling temperature stabilization achieved...
We report on high-resolution laser spectroscopy studies $^{249\text{--}253}\mathrm{Cf}$ with spectral linewidths in the order of 100 MHz carried out at RISIKO mass separator Mainz University. In total three atomic ground-state transitions were investigated and hyperfine parameters for odd-$A$ isotopes isotope shift all examined have been determined from measured spectra. The measurements allowed tracking changes mean-squared charge radii across deformed nuclear shell closure $N=152$, whereby...
Long-lived isotopes of plutonium were studied using two complementary techniques, high-resolution resonance ionization spectroscopy (HR-RIS) and collinear laser (CLS). Isotope shifts have been measured on the $5{f}^{6}7{s}^{2}{\phantom{\rule{4pt}{0ex}}}^{7}{F}_{0}\ensuremath{\rightarrow}5{f}^{5}6{d}^{2}7s\phantom{\rule{4pt}{0ex}}(J=1)$ $5{f}^{6}7{s}^{2}{\phantom{\rule{4pt}{0ex}}}^{7}{F}_{1}\ensuremath{\rightarrow}5{f}^{6}7s7p\phantom{\rule{4pt}{0ex}}(J=2)$ atomic transitions HR-RIS method...
The $\ensuremath{\beta}$ decays of the ground state (gs) and isomeric $(m)$ $^{96}\mathrm{Y}$ have been studied with total absorption $\ensuremath{\gamma}$-ray spectroscopy technique at Ion Guide Isotope Separator On-Line facility. separation ${8}^{+}$ from ${0}^{\ensuremath{-}}$ was achieved thanks to purification capabilities JYFLTRAP double Penning trap system. $\ensuremath{\beta}$-intensity distributions both independently determined. In analyses deexcitation 1581.6 keV level in...
Mid-infrared laser absorption spectroscopy utilizing a high-finesse optical cavity enables high precision trace analysis of gas molecules. In particular, detection radiocarbon (14C) based on ringdown using quantum cascade (QCL) is gaining attention as an alternative to accelerator mass spectrometry. This paper reports compact-packaged narrow-linewidth QCL system resonant feedback from external V-shaped cavity. Based frequency noise analysis, the derived linewidth 44 kHz for 100 μs...
In-source resonance ionization spectroscopy was used to identify an efficient and selective three-step excitation/ionization scheme of thorium, suitable for titanium:sapphire (Ti:sa) lasers. The measurements were carried out in the preparation laser spectroscopic investigations identification low-lying 229mTh isomer predicted at 7.6 ± 0.5 eV above nuclear ground state. Using a sample 232Th, multitude optical transitions leading over 20 previously unknown intermediate states even parity as...