Strona główna » Instytut » Pracownicy » Andrzej Góźdź prof. dr hab. Andrzej GóźdźZakładZakład Fizyki Matematycznej Stanowisko:profesor zwyczajny Kontakt:pokój: 312 e-mail: andrzej.gozdz@umcs.lublin.pl
Specjalność naukowa:fizyka teoretyczna, informatyka Funkcje pełnione w IF UMCS:Kierownik Zakładu - A. Góźdź,A. Dobrowolski,J. Dudek,K. Mazurek, Modelling the electromagnetic transitions in tetrahedral-symmetric nuclei, International Journal of Modern Physics E, 19(), 2010, 621-632
- A. Dobrowolski,A. Góźdź,J. Dudek, On a selection rule for electric transitions in axially-symmetric nuclei, International Journal of Modern Physics E, 19(), 2010, 685-691
- J. Dudek,A. Góźdź,K. Mazurek,H. Molique, Mean-field theory of nuclear stability and exotic point-group symmetries, Journal of Physics G: Nuclear and Particle Physics, 37(), 2010, 064032(1-16)
- H. Molique,J. Dudek,D. Curien,A. Góźdź,A. Dobrowolski, Nuclear rotational-band interaction-mechanism revisited, International Journal of Modern Physics E, 19(), 2010, 633-639
- A. Góźdź, M. Miśkiewicz, J. Dudek, A. Dobrowolski, Collective hamiltonians with tetrahedral symmetry: formalism and general features, International Journal of Modern Physics E, 18(), 2009, 1028-1035
- A. Góźdź, K. Stefańska, Are there nuclear decayed fragments free or they are in a stationary state?, International Journal of Modern Physics E, 18(), 2009, 1062-1065
- K. Mazurek, J. Dudek, A. Góźdź, D. Curien, M. Kmiecik, A. Maj, New nuclear stability islands of octahedral and tetrahedral shapes, Acta Physica Polonica B, 40(), 2009, 731-735
- Q. T. Doan, D. Curien, O. Stezowski, J. Dudek, A. Góźdź, J. Piot, G. Duchene, B. Gall, H. Molique, M. Richet, P. Medina, N. Redon, Ch. Schmitt, P. Jones, R. Julin, P. Peura, S. Ketelhut, M. Nyman, U. Jakobsson, A. Maj, K. Zuber, K. Mazurek, P. Bednarczyk, N. Schunck, J. Dobaczewski, A. Astier, I. Deloncle, D. Verney, G. deAngelis, J. Gerl, Search for fingerprints of tetrahedral symmetry in 156Gd, Acta Physica Polonica B, 40(), 2009, 725-730
- J. Dudek, K. Mazurek, D. Curien, A. Dobrowolski, A. Góźdź, D. Hartley, A. Maj, L. Riedinger, N. Schunck, Theory of nuclear stability using point group symmetries: outline and illustrations, Acta Physica Polonica B, 40(), 2009, 713-724
- Góźdź, A. Stefańska, K., Arrival time for massive particles, International Journal of Modern Physics E – Nuclear Physics, 17(), 2008, 217-227
- Góźdź, A. Miśkiewicz, M. Dudek, J., Tensor formalism for rotational
and vibrational nuclear motions with discrete symmetries: rotational terms, International Journal of Modern Physics E – Nuclear Physics, 17(), 2008, 272-275
- Góźdź, A. Stefańska, K., Projection evolution and delayed-choice
experiments, Journal of Physics: Conference Series, 104(), 2008, 012007(1-9)
- Góźdź, A. Dębicki, M. Stefańska, K., Interferences in time, Physics of Atomic Nuclei, 71(), 2008, 892-898
- Dudek, J. Góźdź, A. Curien, D. Pangon, V. Schunck, N., Nuclear tetrahedral symmetry and collective rotation, Acta Physica Polonica B, 38(), 2007, 1389-1404
- Dudek, J. Dobaczewski, J. Dubray, N. Góźdź, A. Pangon, V. Schunck, N., Nuclei with tetrahedral symmetry, International Journal of Modern Physics E, 16(), 2007, 516-532
- Góźdź, A., Optimized description of nuclear shapes and symmetries, International Journal of Modern Physics E, 16(), 2007, 541-551
- Dębicki, M. Góźdź, A. Stefańska, K., Proton emission, γ-lasers and time interference, International Journal of Modern Physics E, 16(), 2007, 616-623
- Góźdź, A. Dębicki, M., Time operator and quantum projection evolution, Physics of Atomic Nuclei, 70(), 2007, 529-536
- Debicki, M.
Gozdz, A., Time-of-arrival operator within space-time approach to quantum mechanics, International Journal of Modern Physics E-Nuclear Physics, 15(2), 2006, 437-440
Abstract: In this paper we consider the time as a dynamical variable. In particular we apply the time operator to an example of the particle arrival problem within two-dimensional space-time.
- Gozdz, A.
Skefanska, K., Toy model of fission within the projection evolution approach, International Journal of Modern Physics E-Nuclear Physics, 15(2), 2006, 500-503
Abstract: The toy model of "fission" shows the way how to get the temporal characteristics of the fission process within the projection evolution approach.
- Dudek, J.
Schunck, N.
Dubray, N.
Gozdz, A., Exotic nuclear shapes: Today and tomorrow, International Journal of Modern Physics E-Nuclear Physics, 14(3), 2005, 389-394
Abstract: After recalling some in principle known but seldom mentioned facts about variety of concepts/notions of the nuclear shapes, we briefly summarize the results of the recent microscopic calculations predicting the existence of the large-elongation (hyper-deformed) nuclear configurations - as well as another series of calculations predicting that some nuclei should exhibit high-rank symmetries: the tetrahedral and the octahedral ones. The latter are associated with 48- and 96- symmetry elements, respectively, of the nuclear mean-field Hamiltonian. Obviously the physics motivations behind the hyper-deformation and the high-rank symmetry studies axe not the observations of the new geometrical forms as such; in our opinion these motivations are much deeper and are given in the text.
- Gozdz, A.
Debicki, M.
Pietrow, M., Projection evolution and decay of a system, International Journal of Modern Physics E-Nuclear Physics, 14(3), 2005, 477-484
Abstract: We show that the projection evolution approach can reproduce the exponential decay law. The method can be potentially used to calculate the lifetimes of decaying nuclei.
- Schunck, N.
Dudek, J.
Gozdz, A.
Regan, P. H., Tetrahedral symmetry in ground and low-lying states of exotic A similar to 110 nuclei, Physical Review C, 69(6), 2004, art. no.-061305
Abstract: Recent calculations predict a possible existence of nuclei with tetrahedral symmetry: more precisely, the mean-field Hamiltonians of such nuclei are symmetric with respect to double point-group T-d(D). In this paper, we focus on the neutron-rich zirconium isotopes as an example and present realistic mean-field calculations which predict tetrahedral ground-state configurations in Zr-108,Zr-110 and low-lying excited states of tetrahedral symmetry in a number of Nless than or equal to66 isotopes. The motivations for focusing on these nuclei together with a discussion of the possible experimental signatures of tetrahedral symmetry are also presented.
- Gozdz, A.
Miskiewicz, M.
Olszewski, A., Remarks on symmetries of generalized rotor space, International Journal of Modern Physics E-Nuclear Physics, 13(1), 2004, 37-45
Abstract: We propose methods of analysis of the symmetries of the rotor space. A few examples of the point symmetries and their consequences for the state space of the quantum rotors are shortly considered.
- Miskiewicz, M.
Gozdz, A.
Dudek, J., Quantum rotational spectra and classical rotors, International Journal of Modern Physics E-Nuclear Physics, 13(1), 2004, 127-132
Abstract: We consider the generalized rotor Hamiltonians capable of describing quantum systems invariant with respect to symmetry point-groups that go beyond the usual D-2-symmetry of a tri- axial rotor. We discuss the canonical de-quantisation procedure to obtain the classical analogs of the original quantum Hamiltonians. Classical and quantum solutions to the Hamiltonians relevant in the nuclear physics applications are illustrated and compared using the 'usual' (D-2) and an 'exotic' (T-d) symmetries.
- Gozdz, A.
Olszewski, A., Irreducible representations of double point groups within the harmonic oscillator basis, International Journal of Modern Physics E-Nuclear Physics, 13(1), 2004, 357-360
Abstract: It is known, that i.r. of double point groups can be expressed in terms of Wigner functions. Using the projection method proposed by O. Barut and R. Raczka the appropriate basis of i.r. of double point groups within the harmonic oscillator space have been derived. The appropriate numeric and symbolic algebra programs have been constructed.
- Gozdz, A.
Dudek, J.
Miskiewicz, M., Symmetries of nuclear Hamiltonians with redundant variables, Acta Physica Polonica B, 34(4), 2003, 2123-2133
Abstract: The problem of symmetries within the redundant-variable method is revisited. Using physical conditions similar to those suggested by Bohr and Mottelson an appropriate symmetry subspace of the full space of the redundant-variable Hamiltonian has been constructed. Such a construction is a prerequisite condition for entering into any realistic calculation scheme.
- Dudek, J.
Gozdz, A.
Schunck, N., Atomic nuclei with tetrahedral and octahedral symmetries, Acta Physica Polonica B, 34(4), 2003, 2491-2512
Abstract: We present possible manifestations of octahedral and tetrahedral symmetries in nuclei. These symmetries are associated with the OD and T D double point groups. Both of them have very characteristic finger-prints in terms of the nucleonic level properties - unique in the Fermionic universe. The tetrahedral symmetry leads to the four-fold degeneracies in the nucleonic spectra; it does not preserve the parity. The octahedral symmetry leads to the four-fold degeneracies in the nucleonic spectra as well but it does preserve the parity. Microscopic predictions have been obtained using mean-field theory based on the relativistic equations and confirmed by using 'traditional' Schrodinger equation formalism. Calculations are performed in multidimensional deformation spaces using newly designed algorithms. We discuss some experimental fingerprints of the hypothetical new symmetries and possibilities of their verification through experiments.
- Gozdz, A.
Pietrow, M., Quantum motion algebras, Physics of Particles and Nuclei, 33(), 2002, S74-S79
Abstract: The notion of groups of motions as groups of elementary changes in quantum states leads to the Quantum Motion Algebras. These algebras can be considered a good tool for analyzing quantum motion in many-body problems and also in more fundamental quantum mechanics.
- Dudek, J.
Gozdz, A.
Schunck, N.
Miskiewicz, M., Nuclear tetrahedral symmetry: Possibly present throughout the periodic table, Physical Review Letters, 88(25), 2002, art. no.-252502
Abstract: More than half a century after the fundamental, spherical shell structure in nuclei had been established, theoretical predictions indicated that the shell gaps comparable or even stronger than those at spherical shapes may exist. Group- theoretical analysis supported by realistic mean-field calculations indicate that the corresponding nuclei are characterized by the T-d(D) ("double-tetrahedral") symmetry group. Strong shell-gap structure is enhanced by the existence of the four-dimensional irreducible representations of T-d(D); it can be seen as a geometrical effect that does not depend on a particular realization of the mean field. Possibilities of discovering the T-d(D) symmetry in experiment are discussed.
- Dudek, J.
Gozdz, A.
Rosly, D., Quantum rotors and their symmetries, Acta Physica Polonica B, 32(9), 2001, 2625-2638
Abstract: A connection between nuclear symmetries other than those of an ellipsoidal nucleus and the properties of the implied rotational spectra are discussed. The discussion is focused on a few examples of exotic shapes predicted recently by microscopic calculations. Some possible interpretation difficulties related to experiment are shortly mentioned.
- Czachor, H. M.
Gozdz, A., Modeling of granular and cellular materials, Transactions of the Asae, 44(2), 2001, 439-445
Abstract: Two different approaches for modeling of granular and cellular materials are presented. The first shows a packing procedure for the reconstruction and quantification of loose, granular media. The reconstruction takes into account the grain size distribution and the porosity of the investigated medium. The concept was examined for six sandy and sandy loam media. In the second approach, a new, unified description of granular and cellular media is proposed, based on a theory similar to quantum mechanics.
- Gozdz, A.
Rosly, D., Collective exchange effect in nuclear collective models, Acta Physica Polonica B, 30(3), 1999, 605-610
Abstract: Possible new quantum effect related to quantum exchange force phenomenon is postulated to explain small staggerings observed in superdeformed and ground state rotational bands of nuclei.
- Kaminski, W. A.
Gozdz, A.
Zareba, P., Extension of the renormalized quasiparticle random phase approximation, Czechoslovak Journal of Physics, 48(2), 1998, 191-195
Abstract: The quasiparticle random phase approximation is extended in order to restore of the Pauli principle beyond the renormalized approach by treating the so-called scattering terms in the QRPA phonon operators. It has been shown that this new framework can be described in a case of a single nuclear shell occupied by both protons and neutrons in terms of the QRPA(14,3) algebra. An application of the formalism to the double beta decay of calcium Ca-48 is discussed to some extent.
- Gozdz, A.
Dudek, J., D-3h intrinsic symmetry versus laboratory reference frame, Acta Physica Polonica B, 27(1-2), 1996, 469-474
Abstract: In the paper the physical quantum numbers labelling the irreducible representations of the point symmetry D-3h have been derived. Both sets of labels, obtained in the intrinsic and laboratory frames, have been considered. This symmetry is related to the octupole deformation of alpha(33)-type which leads to the exotic octupole states of nuclei. The derivations are based on a group algebra formalism.
[ powrót do pełnej listy pracowników ] |