A5063333015- Nuclear physics research studies
- Astronomical and nuclear sciences
- Quantum Chromodynamics and Particle Interactions
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced NMR Techniques and Applications
- Quantum, superfluid, helium dynamics
- Rare-earth and actinide compounds
- Physics of Superconductivity and Magnetism
- Molecular Spectroscopy and Structure
- Nuclear reactor physics and engineering
- Inorganic Fluorides and Related Compounds
- Quantum chaos and dynamical systems
- Radioactive element chemistry and processing
- Crystallography and Radiation Phenomena
- Particle physics theoretical and experimental studies
- Inorganic Chemistry and Materials
- Methane Hydrates and Related Phenomena
- Cold Fusion and Nuclear Reactions
- Magnesium Alloys: Properties and Applications
- Synthesis and characterization of novel inorganic/organometallic compounds
- Microstructure and Mechanical Properties of Steels
- Superconductivity in MgB2 and Alloys
Helmholtz-Zentrum Berlin für Materialien und Energie
2010-2021
Joint Institute for Nuclear Research
2014-2016
Freie Universität Berlin
2004-2016
Bharathiar University
2014-2015
Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering
2010
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
2007-2008
German Orient Foundation
2004-2006
Oak Ridge National Laboratory
1995
Max Planck Institute for Chemistry
1980-1982
Max Planck Institute for Nuclear Physics
1964-1973
Certain aspects of the recently proposed antisymmetrised alpha particle product state wave function, or THSR cluster for description ground in 8Be, Hoyle 12C, and analogous states heavier nuclei, are elaborated detail. For instance, influence antisymmetrisation on bosonic character particles is studied carefully. It shown to be weak, so that predominant. The de Broglie length much larger than inter-alpha distance. pointed out features low density gas have measurable consequences, one which,...
An experimental way of testing Bose-Einstein condensation alpha clusters in the atomic nucleus is reported. The enhancement cluster emission and multiplicity partition possible emitted could be direct signatures for condensed states. barrier clusters, such as (8)Be (12)C(O(+)(2)), calculated compared with sequential 2 or 3alpha particles from compound nucleus. For calculations, a simple approach using folded Woods-Saxon potential used.
Versions of the M3Y effective nucleon-nucleon interaction, with different prescriptions for knock-on exchange contributions and density dependence, have been used in a study energy dependence nucleon optical potential nuclear matter as well systematic folding model analysis elastic $^{6}\mathrm{Li}$${+}^{12}$C scattering data at ${\mathit{E}}_{\mathrm{lab}}$=60--318 MeV to potential. Contributions from (breakup) dynamical polarization real part are simulated by surface correction using...
We study in this work the preference of arrangements fragments leading to ternary fission. Earlier experimental investigations on subject have established fact that emission a third particle happens direction perpendicular fission axis. Recently, within missing mass approach, it has been reported for comparable masses, so-called collinear cluster tripartition (CCT), occurs. The potential energy surface (PES) three-body fragmentation $^{252}\mathrm{Cf}$ is studied. PESs are calculated...
The collinear cluster decay in 252Cf(sf, fff), with three fragments of different masses (e.g. 132Sn, 52–48Ca, 68–72Ni), which has been observed by the FOBOS group JINR, established a new mode heavy nuclei, tripartition (CCT). same type ternary fission reaction 235U(nth, fff). This kind "true fission" nuclei predicted many times theoretical works during last decades. In present note we discuss true (TFFF) into almost equal size Z=98→Zi=32, 34, 32) systems. possible channels are from...
The study of the ternary fission nuclei has received new interest recently. It is general for nuclear dynamics, although process very rare. In present work, we discuss possibilities true (fragment masses $A>30$) in $^{252}\mathrm{Cf}$ different mass splits. These splits are strongly favored a collinear geometry. Based on three cluster model (TCM), it shown that into fragments with almost equal one possible modes $^{252}\mathrm{Cf}$. For decays formation lightest fragment at center highest...
We discuss the multiple decay modes of collinear fission in 252Cf(sf, fff), with three fragments as suggested by potential energy surface (PES). Fission a statistical is governed phase space different channels, which are PES-landscape. The population determined minima PES at scission points and on internal barriers. ternary proceeds sequential process, two steps. originally observed 252Cf(sf) into masses (e.g. 132–140Sn, 52–48Ca, 68–72Ni), FOBOS group FLNR (Flerov Laboratory for Nuclear...
We have studied gas-like states of $\ensuremath{\alpha}$ clusters around an $^{16}\mathrm{O}$ core in $^{24}\mathrm{Mg}$ based on a microscopic $\ensuremath{\alpha}$-cluster model. The ${0}^{+}$ below the ${}^{16}\mathrm{O}+\ensuremath{\alpha}+\ensuremath{\alpha}$ threshold, which are candidates for resonance solution judging from energy convergence behavior, strongly excited by isoscalar monopole ($E0$) operator ground state, could be observed as experimental signature well-developed...
We consider the collinear ternary fission which is a sequential decay with very short time between ruptures of two necks connecting middle cluster nuclear system and outer fragments. In particular, we case where Coulomb field first massive fragment separated during step produces lower pre-scission barrier in second residual part system. this case, obtain probability about $10^{-3}$ for yield clusters such as \nuclide[70]{Ni}, \nuclide[80-82]{Ge}, \nuclide[86]{Se}, \nuclide[94]{Kr}...
The existence of a new type cluster decay called 'collinear tri-partition' (CCT) is discussed by an analysis the landscape potential energy surface (PES). total ternary system found as sum binding energies fragments and nucleus–nucleus interaction between them. pre-scission state assumed to be arranged chain three along straight line. Minima valleys PES are determined variation proton neutron distributions Pre-scission prompt emission neutrons calculated for cases two neutrons. presence...
Using a unique two-arm detector system for heavy ions (the BRS, binary reaction spectrometer), coincident fission events have been measured from the decay of $^{60}\mathrm{Zn}$ compound nuclei formed at 88 MeV excitation energy in reactions with $^{36}\mathrm{Ar}$ beams on $^{24}\mathrm{Mg}$ target ${E}_{\mathrm{lab}}({}^{36}\mathrm{Ar})=195$ MeV. The detectors consisted two large-area position-sensitive ($x,y$) gas telescopes Bragg-ionization chambers. From coincidences detectors, inclusive...
A brief outlook on low-energy nuclear physics is presented.Selected recent developments in structure theory are highlighted and a few open questions discussed.
The structure of the neutron-rich isotope 12 Be has been studied using different transfer reactions, which populate distinct structures in . This concerns two-neutron and three-neutron stripping reactions two-proton pick-up at incident energies 15–20 MeV/u. Band positive negative parity are discussed.