A5090207137- Nuclear physics research studies
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Neutrino Physics Research
- Nuclear reactor physics and engineering
- Particle physics theoretical and experimental studies
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Organometallic Complex Synthesis and Catalysis
- Particle accelerators and beam dynamics
- Laser-induced spectroscopy and plasma
- Nuclear Materials and Properties
- Radioactive Decay and Measurement Techniques
- Laser Design and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Astro and Planetary Science
- Radioactive contamination and transfer
- Isotope Analysis in Ecology
- Radiation Detection and Scintillator Technologies
- Radioactive element chemistry and processing
- Asymmetric Hydrogenation and Catalysis
- Quantum, superfluid, helium dynamics
University of Jyväskylä
2016-2025
Uppsala University
2015-2023
Institut National de Physique Nucléaire et de Physique des Particules
2022
Centre National de la Recherche Scientifique
2022
Nantes Université
2022
IMT Atlantique
2022
Universitat de València
2011-2020
Instituto de Física Corpuscular
2017-2020
New York University Press
2019
University at Albany, State University of New York
2019
Abstract Molecules containing short-lived, radioactive nuclei are uniquely positioned to enable a wide range of scientific discoveries in the areas fundamental symmetries, astrophysics, nuclear structure, and chemistry. Recent advances ability create, cool, control complex molecules down quantum level, along with recent upcoming species production at several facilities around world, create compelling opportunity coordinate combine these efforts bring precision measurement extreme nuclei. In...
ABSTRACT Aphysically based, computationally simple, analytical framework is developed for predicting the effects of topography on erosion and deposition two-dimensional quasi three-dimensional non-planar hillslopes. It then extended to apply more complex slope geometries found in real terrain using a digital model. An example given predicted patterns an experimental catchment at Wagga Wagga, Australia. Predicted zones high show good agreement with long term pattern catchment, especially...
Collinear laser spectroscopy was performed on Ga (Z=31) isotopes at ISOLDE, CERN. A gas-filled linear Paul trap (ISCOOL) used to extend measurements towards very neutron-rich (N=36-50). ground state (g.s.) spin I=1/2 is measured for 73Ga, being near degenerate with a 3/2{-} isomer (75 eV≲E{ex}≲1 keV). The 79Ga g.s., I=3/2, dominated by protons in the πf{5/2} orbital and 81Ga 5/2{-} level becomes g.s. data are compared shell-model calculations f{5/2}pg{9/2} model space, calling further...
Atomic masses of the neutron-rich isotopes (76-80)Zn, (78-83)Ga, (80-85)Ge, (81-87)As, and (84-89)Se have been measured with high precision using Penning trap mass spectrometer JYFLTRAP at IGISOL facility. The (82,83)Ga, (83-85)Ge, (84-87)As, 89Se were for first time. These new data represent a major improvement in knowledge this region. Two-neutron separation energies provide evidence reduction N=50 shell gap energy towards germanium (Z=32) subsequent increase gallium (Z=31). are compared...
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...
A new method has been developed for increasing the sensitivity of collinear laser spectroscopy. The utilizes an ion-trapping technique in which a continuous low-energy ion beam is cooled and accumulated linear Paul trap subsequently released as short (10-20 micros) bunch. In measurements signal-to-noise ratio improved by factor 2 x 10(4), allowing spectroscopic to be made with ion-beam fluxes approximately 50 ions s(-1). bunching demonstrated on-line isotope shift hyperfine structure...
The masses of very neutron-deficient nuclides close to the astrophysical rp- and νp-process paths have been determined with Penning trap facilities JYFLTRAP at JYFL/Jyväskylä SHIPTRAP GSI/Darmstadt. Isotopes from yttrium (Z=39) palladium (Z=46) produced in heavy-ion fusion-evaporation reactions. In total, 21 were studied, almost half mass values experimentally for first time: 88Tc, 90−92Ru, 92−94Rh, 94,95Pd. For 95Pdm, (21/2+) high-spin state, a direct determination was performed. Relative...
Atomic masses of $^{95--100}\mathrm{Sr}$, $^{98--105}\mathrm{Zr}$, and $^{102--110}\mathrm{Mo}$ have been measured with a precision 10 keV employing Penning trap setup at the IGISOL facility. Masses $^{104,105}\mathrm{Zr}$ $^{109,110}\mathrm{Mo}$ are for first time. Our improved results indicate significant deviations from previously published values deduced beta end point measurements. The most neutron-rich studied isotopes found to be significantly less bound (1 MeV) compared 2003 atomic...
The β feeding probability of Tc102,104,105,106,107, Mo105, and Nb101 nuclei, which are important contributors to the decay heat in nuclear reactors, has been measured using total absorption technique. We have coupled for first time a spectrometer Penning trap order obtain sources very high isobaric purity. Our results solve significant part long-standing discrepancy γ component Pu239 4–3000 s range.Received 13 May 2010DOI:https://doi.org/10.1103/PhysRevLett.105.202501© 2010 American Physical Society
A new method of optical pumping in an ion beam cooler buncher has been developed to selectively enhance ionic metastable state populations. The technique permits the study elements previously inaccessible laser spectroscopy and applied here Nb. Model independent mean-square charge radii nuclear moments have studied for ;{90,90 m,91,91 m,92,93,99,101,103}Nb cover region N=50 shell closure N approximately 60 sudden onset deformation. increase radius is observed be less than that Y, with a...
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 antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta recorded ILL reactor. (92)Rb makes dominant contribution to reactor spectrum 5-8 MeV range but its decay properties question. We have studied total absorption spectroscopy. Previously unobserved feeding was seen 4.5-5.5 region and GS found be 87.5(25)%. impact calculated summation method is shown discussed.
The rare-earth peak in the $r$-process abundance pattern depends sensitively on both astrophysical conditions and subtle changes nuclear structure region. This work takes an important step elucidating reducing uncertainties calculations via precise atomic mass measurements at JYFLTRAP double Penning trap. $^{158}$Nd, $^{160}$Pm, $^{162}$Sm, $^{164-166}$Gd have been measured for first time precisions $^{156}$Nd, $^{158}$Pm, $^{162,163}$Eu, $^{163}$Gd, $^{164}$Tb improved considerably. Nuclear...
Mass measurements of fission and projectile fragments, produced via $^{238}\mathrm{U}$ $^{124}\mathrm{Xe}$ primary beams, have been performed with the multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) Fragment Separator (FRS) Ion Catcher a resolving power (FWHM) up to 410 000 an uncertainty down $6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$. The nuclides were separated in flight fragment separator FRS at 300 1000 MeV/u thermalized cryogenic stopping cell....
The nuclides 104-108Sn, 106-110Sb, 108,109Te, and 111I at the expected endpoint of astrophysical rp process have been produced in 58Ni+natNi fusion-evaporation reactions IGISOL their mass values were precisely measured with JYFLTRAP Penning trap spectrometer. For 106Sb, 108Sb, 110Sb these are first direct experimental results obtained. related one-proton separation energies derived value for Sp=424(8) keV, shows that branching into closed SnSbTe cycle is weaker than expected.
Radioisotopes of molybdenum have been studied using laser spectroscopy techniques at the IGISOL facility, University Jyväskylä. Differences in nuclear charge radii determined for neutron deficient isotopes 90,91Mo and rich 102–106,108Mo (and all stable isotopes). A smooth transition mean square is observed as number increases with no sudden shape change region around N=60. As N increases, deformation appears to go beyond a maximum fall off N=66 observed. The magnetic moments odd 91,103,105Mo...
The Penning trap mass spectrometer JYFLTRAP, coupled to the Ion Guide Isotope Separator On-Line (IGISOL) facility at Jyväskylä, was employed measure atomic masses of neutron-rich 70-73Ni and 73, 75Cu isotopes with a typical accuracy less than 5keV. 73Ni measured for first time. Comparisons previous data are discussed. Two-neutron separation energies show weak subshell closure 68 28Ni40 . A well established proton shell gap is observed Z = 28