A5042712999- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- Astronomical and nuclear sciences
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Particle physics theoretical and experimental studies
- Rare-earth and actinide compounds
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Nuclear reactor physics and engineering
- Particle accelerators and beam dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Superconducting Materials and Applications
- Quantum, superfluid, helium dynamics
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Detection and Scintillator Technologies
- Quantum chaos and dynamical systems
- Radioactive Decay and Measurement Techniques
- Crystallography and Radiation Phenomena
- Radiopharmaceutical Chemistry and Applications
- Astro and Planetary Science
Technical University of Darmstadt
2016-2025
GSI Helmholtz Centre for Heavy Ion Research
2016-2024
Institut für Hochschulforschung
2023-2024
University of Potsdam
2024
Saha Institute of Nuclear Physics
2024
University of Edinburgh
2023-2024
Yale University
2013-2023
Wright Materials Research (United States)
2008-2023
Université Paris-Saclay
2017-2023
Institut de Recherche sur les Lois Fondamentales de l'Univers
2017-2023
The half-lives of 20 neutron-rich nuclei with Z=27-30 have been measured at the RIBF, including five new (76)Co(21.7(-4.9)(+6.5) ms), (77)Co(13.0(-4.3)(+7.2) (79)Ni(43.0(-7.5)(+8.6) (80)Ni(23.9(-17.2)(+26.0) and (81)Cu(73.2 ± 6.8 ms). In addition, (73-75)Co, (74-78)Ni, (78-80)Cu, (80-82)Zn were determined higher precision than previous works. Based on these results, a systematic study β-decay has carried out, which suggests sizable magicity for both proton number Z = 28 neutron N=50 in (78)Ni.
High-resolution inelastic electron scattering on ${}^{96}$Zr establishes shape coexistence---where two nearby states possess distinct shapes---for this nucleus. Monte Carlo shell-model calculations indicate that the change in Zr isotopes is a quantum phase transition.
The low-spin structure of the 206Tl nucleus was studied in thermal neutron capture reaction 205Tl(𝑛,𝛾)206Tl at Institut Laue-Langevin Grenoble making use multidetector HPGe array Fission Product Prompt 𝛾-ray Spectrometer and 𝛾𝛾-coincidence techniques. information on discrete structures located below binding energy extended: a total number 99 𝛾 rays (75 new) were observed 21 excited states (8 located. analysis angular correlations used to extract transitions multipolarities, which helped...
The nucleus ${}^{94}\mathrm{Mo}$ was investigated using a powerful combination of $\ensuremath{\gamma}$-singles photon scattering experiments and $\ensuremath{\gamma}\ensuremath{\gamma}$-coincidence studies following the $\ensuremath{\beta}$ decay ${}^{94}{\mathrm{Tc}}^{m}$. data survey short-lived ${J}^{\ensuremath{\pi}}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1}^{+}{,2}^{+}$ states include branching ratios, $E2/M1$ mixing lifetimes, transition strengths. proton-neutron...
We examine a quantum phase transition in gamma-soft nuclei, where the O(6) limit is simultaneously dynamical symmetry of U(6) group interacting boson model and critical point prolate-oblate transition. This only example transitional behavior that can be described analytically for finite s,d system.
The possibility of observing neutrinoless double $\ensuremath{\beta}$ decay offers the opportunity determining effective neutrino mass if nuclear matrix element were known. Theoretical calculations are uncertain, and measurements occupations valence orbits by nucleons active in can be important. occupation neutron ground states $^{76}\mathrm{Ge}$ (a candidate for such decay) $^{76}\mathrm{Se}$ (the daughter nucleus) determined precisely measuring cross sections both neutron-adding removing...
We report on the measurement of first 2(+) and 4(+) states (66)Cr (70,72)Fe via in-beam γ-ray spectroscopy. The nuclei interest were produced by (p,2p) reactions at incident energies 260 MeV/nucleon. experiment was performed Radioactive Isotope Beam Factory, RIKEN, using DALI 2γ-ray detector array novel MINOS device, a thick liquid hydrogen target combined with vertex tracker. A low-energy plateau 2(1)(+) 4(1)(+) as function neutron number observed for N≥38 N≥40 even-even Cr Fe isotopes,...
In-beam γ-ray spectroscopy of ^{79}Cu is performed at the Radioactive Isotope Beam Factory RIKEN. The nucleus interest produced through proton knockout from a ^{80}Zn beam 270 MeV/nucleon. level scheme up to 4.6 MeV established for first time and results are compared Monte Carlo shell-model calculations. We do not observe significant feeding excited states below 2.2 MeV, which indicates that Z=28 gap N=50 remains large. show can be described in terms valence outside ^{78}Ni core, implying...
Exclusive cross sections and momentum distributions have been measured for quasifree one-neutron knockout reactions from a $^{54}\mathrm{Ca}$ beam striking on liquid hydrogen target at $\ensuremath{\sim}200\text{ }\text{ }\mathrm{MeV}/u$. A significantly larger section to the ${p}_{3/2}$ state compared ${f}_{5/2}$ observed in excitation of $^{53}\mathrm{Ca}$ provides direct evidence nature $N=34$ shell closure. This finding corroborates arising new closure neutron-rich calcium isotopes. The...
The first $\ensuremath{\gamma}$-ray spectroscopy of $^{52}\mathrm{Ar}$, with the neutron number $N=34$, was measured using $^{53}\mathrm{K}(p,2p)$ one-proton removal reaction at $\ensuremath{\sim}210\text{ }\text{ }\mathrm{MeV}/\mathrm{u}$ RIBF facility. ${2}_{1}^{+}$ excitation energy is found 1656(18) keV, highest among Ar isotopes $N>20$. This result experimental signature persistence $N=34$ subshell closure beyond $^{54}\mathrm{Ca}$, i.e., below magic proton $Z=20$. Shell-model...
We show that the second-order phase transition between spherical and deformed shapes of atomic nuclei is an isolated point following from Landau theory transitions. This can occur only at junction two or more first-order transitions which explains why it associated with one special type structure requires recently proposed prolate oblate nuclear shapes. Finally, we suggest first empirical example a nucleus located triple-point.
Excited low-spin states in ${}^{94}\mathrm{Mo}$ have been studied extensively with a combination of $\ensuremath{\gamma}$-ray spectroscopic techniques. We performed photon scattering experiments, $\ensuremath{\gamma}\ensuremath{\gamma}$ coincidence measurements following the ${\ensuremath{\beta}}^{+}$ decay ${}^{94}{\mathrm{Tc}}^{\mathrm{m}},$ in-beam studies reaction ${}^{91}\mathrm{Zr}(\ensuremath{\alpha}{,n)}^{94}\mathrm{Mo},$ and...
Following the successful identification of mixed-symmetric one- and two-phonon states in N=52 nuclei 94Mo 96Ru, we have performed a photon scattering experiment on isotone 92Zr. Experimental data shell model calculations show that both, single particle collective degrees freedom are present low-lying levels The second excited quadrupole state shows signatures one-phonon 2+ state, while indicate an almost pure neutron configuration for 2+1 contradiction with F-spin symmetric limit....
The first fast-timing measurements from nuclides produced via the in-flight fission mechanism are reported. lifetimes of 2+ states in 104,106Zr nuclei have been measured β-delayed γ-ray timing stopped radioactive isotope beams. An improved precision for lifetime 21+ state 104Zr was obtained, τ(21+)=2.90−20+25 ns, as well a measurement 106Zr, τ(21+)=2.60−15+20 with corresponding reduced transition probabilities B(E2;21+→0g.s.+)=0.39(2)e2b2 and 0.31(1)e2b2, respectively. Comparisons extracted...
Photon scattering experiments have been performed on the nucleus ${}^{136}$Ba with photon energies of ${E}_{\ensuremath{\gamma}}<~4.1$ MeV and ${E}_{\ensuremath{\gamma}}<~2.8$ MeV. At 2.1 clear evidence for ${2}_{\mathrm{ms}}^{+}$ state has found. From measured lifetime we extract signatures isovector quadrupole excitation in valence shell: a weakly collective $E2$ decay to ground strong $M1$ ${2}_{1}^{+}$ state. As resonant bremsstrahlung is complete reaction, can conclude that ${2}^{+}$ at...
Low-lying collectively excited states of $^{128}\mathrm{Xe}$ were investigated by $\ensuremath{\gamma}$-ray spectroscopy following the $^{12}\mathrm{C}(^{128}\mathrm{Xe},^{128}\mathrm{Xe}{}^{*})^{12}\mathrm{C}$ projectile Coulomb excitation reaction. Nineteen absolute $E2$ transition strengths obtained including first measurement critical $B(E2)$ decays from second and third ${J}^{\ensuremath{\pi}}={0}^{+}$ states. These data are compared with theoretical predictions point symmetry E(5)...
The first measurement of the low-lying states neutron-rich ^{110}Zr and ^{112}Mo was performed via in-beam γ-ray spectroscopy after one proton removal on hydrogen at ∼200 MeV/nucleon. 2_{1}^{+} excitation energies were found 185(11) keV in ^{110}Zr, 235(7) ^{112}Mo, while R_{42}=E(4_{1}^{+})/E(2_{1}^{+}) ratios are 3.1(2), close to rigid rotor value, 2.7(1), respectively. These results compared modern energy density functional based configuration mixing models using Gogny Skyrme effective...
A $\ensuremath{\gamma}\ensuremath{\gamma}$ angular-correlation experiment has been performed to investigate the low-energy states of nucleus ${}^{98}$Mo. The new data, including spin assignments, multipole mixing ratios, and lifetimes reveal evidence for shape coexistence in ${}^{98}$Mo, arising from a proton intruder configuration. This result is reproduced by theoretical calculation within proton-neutron interacting boson model with configuration mixing, based on microscopic energy density...
The decay properties of the Pygmy Dipole Resonance (PDR) have been investigated in semi-magic N=82 nucleus 140Ce using a novel combination nuclear resonance fluorescence and γ–γ coincidence techniques. Branching ratios for transitions to low-lying excited states are determined direct model-independent way both individual excitation energy intervals. Comparison experimental results microscopic calculations quasi-particle phonon model exhibits an excellent agreement, supporting observation...