A5019642459- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Advanced NMR Techniques and Applications
- Astronomical and nuclear sciences
- Quantum chaos and dynamical systems
- Particle physics theoretical and experimental studies
- Molecular Spectroscopy and Structure
- Nuclear Physics and Applications
- Molecular spectroscopy and chirality
- Inorganic Fluorides and Related Compounds
- Quantum, superfluid, helium dynamics
- Black Holes and Theoretical Physics
- X-ray Spectroscopy and Fluorescence Analysis
- High-pressure geophysics and materials
- Astro and Planetary Science
- Cold Atom Physics and Bose-Einstein Condensates
- Mass Spectrometry Techniques and Applications
- Material Science and Thermodynamics
- Crystallography and Radiation Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Rare-earth and actinide compounds
- Radioactive element chemistry and processing
HUN-REN Institute for Nuclear Research
2015-2024
Hungarian Academy of Sciences
2009-2019
University of Debrecen
2009-2011
Instituto Nacional de Investigaciones Nucleares
2009-2011
Justus-Liebig-Universität Gießen
1992-2009
Universidade de São Paulo
2009
Joint Institute for Nuclear Research
2009
Universitat de València
2009
Goethe University Frankfurt
1992
Argonne National Laboratory
1980
Excitation functions were measured at forward angles for the reaction $^{24}\mathrm{Mg}$($^{16}\mathrm{O}$, $^{12}\mathrm{C}$)$^{28}\mathrm{Si}$ to ground and first excited states of $^{28}\mathrm{Si}$. Resonancelike structures found in both excitation with pronounced maxima center-of-mass energies \ensuremath{\sim} 28, 31, 34 MeV. Angular distributions obtained these three are fitted rather well ${{P}_{L}}^{2}(cos\ensuremath{\theta})$ $L=21, 23, \mathrm{and} 25$, respectively.
We investigate properties of the generator coordinate method (GCM) on a collective basis antisymmetrized quasicluster states to describe cluster-shell competition in $^{20}\mathrm{Ne}$ and $^{24}\mathrm{Mg}$ owing spin-orbit interaction. By introducing single additional parameter antisymmetrized-cluster function, continuous transformation $\ensuremath{\alpha}$ cluster(s) into independent nucleons can be described. apply this GCM trial wave function study detail transition from cluster...
The shape isomers of the ${}^{28}$Si nucleus are derived from Nilsson model calculations combined with quasidynamical $\mathrm{SU}(3)$ symmetry considerations, and their possible binary clusterizations determined. results compared those other calculations. Concerning superdeformed state our finding gives support to new candidate suggested by Jenkins et al. [Phys. Rev. C 86, 064308 (2012)].
A recent analysis of the $^{12}\mathrm{C}$$+$$^{24}\mathrm{Mg}$ scattering [W. Sciani et al., Phys. Rev. C 80, 034319 (2009)] suggests existence a hyperdeformed band in $^{36}\mathrm{Ar}$ nucleus, completely line with predictions $\ensuremath{\alpha}$ D. M. Rae and A. C. Merchant, Lett. B279, 207 (1992)] binary cluster calculations [J. Cseh 70, 034311 (2004)]. Here we review structural understanding superdeformed states present new results on shape isomers as well. Special attention is paid...
Algebraic models are proposed for the description of shell-like quarteting nucleons both on phenomenologic and semimicroscopic levels. In previous one quartet is considered as a structureless object, while in latter its constituents treated explicitely. The excitation spectrum generated by SU(3) formalism cases. An application to $^{20}$Ne nucleus presented.
Background: The shape isomers of the $N=Z=\mathrm{even}$ nuclei are known from energy-surface calculations within Bloch-Brink (BB) $\ensuremath{\alpha}$-cluster model and Nilsson model. As an alternative, a new method (called SCS) has been proposed recently for determining stable shapes, which is based on investigation stability consistency $\mathrm{SU}(3)$ symmetry (or quadrupole deformation).Purpose: We wish to derive $\ensuremath{\alpha}$-like SCS compare them with results calculation....
The relation of superdeformed and cluster states light nuclei is discussed both on the basis Harvey's prescription in connection between shell model established by Wildermuth et al. (1977).It turns out that these two prescriptions associate same clusterizations terms alpha -like (N=Z=even) with states.
The allowed and forbidden binary cluster configurations of the ground, superdeformed, hyperdeformed states some nuclei are determined, based on (real or effective) $\mathrm{U}(3)$ selection rule. stability from viewpoint binding energy is also investigated.
Investigates the question of whether or not vibrational spectrum a two-dimensional interacting boson model can be transformed into rotational one via quantum deformation group structure. It turns out that although q-deformed shows another rotational-like features at different values parameter, nevertheless, all requirements behavior cannot obtained simultaneously. This result indicates algebraic treatment give an analytical solution to eigenvalue problem models nuclear and molecular physics...
Fifteen strongly oscillating angular distributions of the elastic scattering $^{12}\mathrm{C}+^{24}\mathrm{Mg}$ at energies around Coulomb barrier (${E}_{\mathrm{c}.\mathrm{m}.}=10.67\text{\ensuremath{-}}16.00$ MeV) are reproduced by adding five Breit-Wigner resonance terms to $l=2,4,6,7$, and 8 $S$ matrix. The nonresonant, background matrix ${S}_{l}^{0}$ is calculated using S\~ao Paulo potential. $J=2,4,6,7$, $\ensuremath{\hbar}$ molecular resonances fit well into a rotational band,...
We propose an improved version of the antisymmetrized quasicluster model (AQCM) to describe a smooth transition from $\ensuremath{\alpha}$-cluster wave function $jj$-coupling shell and apply it ground state ${}^{12}$C. The cluster-shell in ${}^{12}$C is characterized AQCM by only two parameters: $R$ representing distance between $\ensuremath{\alpha}$ clusters center mass $\ensuremath{\Lambda}$ describing break clusters. optimal for intermediate three-$\ensuremath{\alpha}$ cluster with...
The heavy-ion radiative capture reaction ${}^{12}$C(${}^{16}$O,$\ensuremath{\gamma}$)${}^{28}$Si has been studied at three energies ${E}_{\mathrm{c}.\mathrm{m}.}=8.5$, 8.8, and 9 MeV which are close to the Coulomb barrier. weak process identified by measuring ${}^{28}$Si recoils in highly selective 0${}^{\ensuremath{\circ}}$ spectrometer DRAGON TRIUMF (Vancouver). coincident $\ensuremath{\gamma}$ rays have recorded associated BGO array. This allowed a complete measurement of spectrum...
The relation of quarteting and clustering in atomic nuclei is discussed based on symmetry-considerations. This connection enables us to predict a complete high-energy cluster spectrum from the description low-energy quartet part. As an example 28Si nucleus considered, including its well-established ground-state region, recently proposed superdeformed band, high-lying molecular resonances.
The concept of the multichannel dynamical symmetry is introduced. This may show up in an atomic nucleus due to its different cluster configurations, and connects interactions distinct reaction channels. correlated distribution states at low high energies can serve as a signature it. An application $^{28}\mathrm{Si}$ nucelus performed terms $^{24}\mathrm{Mg}$+\ensuremath{\alpha} $^{12}\mathrm{C}$${+}^{16}$O fragmentations.
The $^{24}\mathrm{Mg}$($^{16}\mathrm{O}$, $^{12}\mathrm{C}$)$^{28}\mathrm{Si}$ reaction has been studied over the energy range $26.3<{E}_{\mathrm{c}.\mathrm{m}.}<32.4$ MeV. Angular distributions with $4.5\ifmmode^\circ\else\textdegree\fi{}\ensuremath{\le}{\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}\ensuremath{\le}50\ifmmode^\circ\else\textdegree\fi{}$ were measured at nine different energies in this and an excitation function was a wider...
The $^{14}\mathrm{C}$+\ensuremath{\alpha} system is described in terms of the new semimicroscopic algebraic cluster model, which based on coupling SU(3) shell model to vibron model. Molecular states $^{18}\mathrm{O}$ nucleus built $^{14}\mathrm{C}$ levels with (0,2) quantum numbers are constructed, and corresponding energy eigenvalues obtained from a Hamiltonian dynamical symmetry. able account for 34 experimental assigned even- or odd-parity bands, some new. Enhanced E1 E2 transitions also obtained.
A composite symmetry of the nuclear structure, called multichannel dynamical symmetry, is established. It can describe different cluster configurations (defined by reaction channels) in a unified framework; thus, it has considerable predictive power. The two-channel case presented detail, and its conceptual similarity to supersymmetry discussed.
Background: Aspects of the nuclear structure light $\ensuremath{\alpha}$-conjugate nuclei have long been associated with clustering based on $\ensuremath{\alpha}$ particles and heavier systems such as $^{12}\mathrm{C}$ $^{16}\mathrm{O}$. Such structures are strong deformation corresponding to superdeformed or even hyperdeformed bands. Superdeformed bands identified in $^{40}\mathrm{Ca}$ neighboring find good description within shell model, mean-field, $\ensuremath{\alpha}$-cluster models....
A semimicroscopic algebraic $^{12}\mathrm{C}$${+}^{12}$C cluster model is applied to describe the structure of $^{24}\mathrm{Mg}$ nucleus. The spectrum T=0 states analyzed in terms this configuration with $^{12}\mathrm{C}$ clusters allowed occupy their ${0}^{+}$(0.0 MeV), ${2}^{+}$(4.439 and ${4}^{+}$(14.038 MeV) states. About a hundred experimental levels below ${\mathit{E}}_{\mathit{x}}$\ensuremath{\simeq}16 MeV are assigned bands. large number observed reduced E2 transition probabilities...
A geometrical mapping of the semimicroscopic algebraic cluster model is given. The variables are relative radius vector and quadrupole deformation parameters. last ones correspond to absolute \ensuremath{\beta} \ensuremath{\gamma} values, while orientation deformed nucleus in laboratory can be changed. We show that position minimum nuclear molecular potential determined by minimal number \ensuremath{\pi} bosons describing motion. implementation Pauli principle. Applications simple systems...