Search results for: K. Pomorski

Items from 1 to 20 out of 28 results

article

On possible shape isomers in the Pt-Ra region of nuclei

B. Nerlo-Pomorska, K. Pomorski, J. Bartel, C. Schmitt

The European Physical Journal A > 2017 > 53 > 4 > 1-12

. A certain number of yet unknown super- and hyper-deformed shape isomeric states are predicted in even-even nuclei of the region between Pt and Ra, using the macroscopic-microscopic model based on the Lublin Strasbourg Drop for the macroscopic energy and shell plus pairing corrections evaluated through the Yukawa-folded mean-field potential for the microscopic part. A new, rapidly converging shape...

article

Mass distribution of fission fragments within the Born-Oppenheimer approximation

K. Pomorski, F. A. Ivanyuk, B. Nerlo-Pomorska

The European Physical Journal A > 2017 > 53 > 3 > 1-8

. The fission fragments mass-yield of ²³⁶ U is obtained by an approximate solution of the eigenvalue problem of the collective Hamiltonian that describes the dynamics of the fission process whose degrees of freedom are: the fission (elongation), the neck and mass-asymmetry modes. The macroscopic-microscopic method is used to evaluate the potential energy surface. The macroscopic energy part is calculated...

article

Proton emission half-lives within a Gamow-like model

A. Zdeb, M. Warda, C. M. Petrache, K. Pomorski

The European Physical Journal A > 2016 > 52 > 10 > 1-6

. Proton emission is described using a model which has previously given good results in the description of $\alpha$ α and cluster radioactivity. The simple phenomenological formalism, based on the Gamow theory for alpha decay, is now extended by including the centrifugal term. The model contains only one parameter: the effective nuclear radius constant. Its value was once found for alpha and...

article

Solving the eigenvalue problem of the nuclear Yukawa-folded mean-field Hamiltonian

A. Dobrowolski, K. Pomorski, J. Bartel

Computer Physics Communications > 2016 > 199 > C > 118-132

The nuclear Hamiltonian with a Yukawa-folded mean-field potential is diagonalized within the basis of a deformed harmonic-oscillator in Cartesian coordinates. The nuclear shape is characterized by the equivalent sharp surface described either by the well known Funny–Hills or the Trentalange–Koonin–Sierk parametrizations. They are both able to describe a very vast variety of nuclear deformations, including...

article

Remarks on the nuclear shell-correction method

K. Pomorski, B. Nerlo-Pomorska

The European Physical Journal A > 2016 > 52 > 5 > 1-6

. It is shown that the nuclear single-particle energy spectra obtained in the selfconsistent way obey similar particle number dependence as the spectrum of a pure 3D harmonic oscillator potential. This effect was used to improve the quality of evaluation of the shell correction energy in weakly bound nuclei. The magnitude of the traditional Strutinsky shell correction energy obtained by the smearing...

article

Perspective on basic architectures and properties of unconventional and Field Induced Josephson junction devices

K. Pomorski, P Prokopow

International Journal of Microelectronics and Computer Science > 2013 > Vol. 4, nr 3 > 110--115

We present the concept of unconventional and Field Induced Josephson junction (uJJ and FIJJ) and devices built from them. They can be made by placement of ferromagnetic strip on top of a superconducting strip. In such case modulation of superconducting order parameter and magnetization is obtained. Furthermore we can build tunable Josephson junction arrays, which can be tuned by applying external...

article

O fizyce prawie wszystkiego w stulecie odkrycia Rutherforda [wykład]

K. Pomorski

Postępy Fizyki > 2012 > T. 63, z. 3 > 126--131

Obecny rok Marii Curie-Skłodowskiej jest dobrą okazją do przedstawienia aktualnych problemów fizyki jądra atomowego, zwanej też coraz częściej femtofizyką. Przełomowe odkrycie Rutherforda z 1911 roku zmieniło całkowicie dotychczasowe poglądy na budowę atomów i dało początek temu nowemu działowi nauki. Na naszą obecną wiedzę o budowie jądra atomowego pracowało kilka pokoleń uczonych i nie sposób wymienić...

article

Problems in contemporary nuclear physics

A. Góźdź, W. Kamiński, B. Nerlo-Pomorska, K. Pomorski

Annales UMCS, Physica > 2011 > 66 > 17-48

Last decade research topics of the Nuclear Theory Group of the M.C.S. University in Lublin are presented in this article. The achivements of the group and its further plans are confronted with current problems of modern nuclear physics.

article

Problems in contemporary nuclear physics

A. Góźdź, W. Kamiński, B. Nerlo-Pomorska, K. Pomorski

Annales UMCS, Sectio AAA: PHYSICA > 2011 > 66 > 17-48

article

Experimental and theoretical investigations of quadrupole collective degrees of freedom in 104Ru

J. Srebrny, T. Czosnyka, Ch. Droste, S.G. Rohoziński, more

Nuclear Physics, Section A > 2006 > 766 > Complete > 25-51

The magnitudes and signs of twenty eight E2 and three M1 matrix elements involving 17 low-lying excited states in ¹⁰⁴ Ru have been measured by Coulomb excitation using ²⁰⁸ Pb, ¹³⁶ Xe and ⁵⁸ Ni ions. The completeness of the set of E2 matrix elements is sufficient to extract, directly from the data, the expectation values of the intrinsic-frame E2 moments that provide...

article

Evidence for the Jacobi shape transition in hot ⁴ ⁶ Ti

A. Maj, M. Kmiecik, A. Bracco, F. Camera, more

Nuclear Physics, Section A > 2004 > 731 > Complete > 319-326

The γ-ras from the decay of the GDR in the compound nucleus reaction ¹ ⁸ O+ ² ⁸ Si at bombarding enery of 105 MeV have been measured in an experiment using a setup consisting of the combined EUROBALL IV, HECTOR and EUCLIDES arrays. The shape of the rotating compound nucleus, ⁴ ⁶ Ti, is expected to undergo the Jacobi transition around spin 28 h. A comparison of the...

article

Evidence for the Jacobi shape transition in hot46Ti

A. Maj, M. Kmiecik, A. Bracco, F. Camera, more

Nuclear Physics, Section A > 2004 > 731 > Complete > 319-326

The γ-ras from the decay of the GDR in the compound nucleus reaction ¹⁸ O+ ²⁸ Si at bombarding enery of 105 MeV have been measured in an experiment using a setup consisting of the combined EUROBALL IV, HECTOR and EUCLIDES arrays. The shape of the rotating compound nucleus, ⁴⁶ Ti, is expected to undergo the Jacobi transition around spin 28ħ. A comparison of the GDR lineshape...

article

Mean-field description of fusion barriers with Skyrme's interaction

A. Dobrowolski, K. Pomorski, J. Bartel

Nuclear Physics, Section A > 2003 > 729 > 2-4 > 713-725

Fusion barriers are determined in the framework of the Skyrme energy-density functional together with the semi-classical approach known as the Extended Thomas-Fermi method. The barriers obtained in this way with the Skyrme interaction SkM ^* turn out to be close to those generated by phenomenological models like those using the proximity potentials. It is also shown that the location and the...

article

$\delta$ -pairing forces and collective pairing vibrations

K. Sieja, A. Baran, K. Pomorski

The European Physical Journal A > 2003 > 20 > 3 > 413-418

The collective pairing Hamiltonian is obtained in the framework of the generator coordinate method in the Gaussian overlap approximation with a slightly modified BCS function used as a generator function. The collective variable $\alpha$ , measuring the monopole moment of the pairing field, and the gauge transformation angle $\phi$ are chosen as generator coordinates. The vibrational ground states are...

article

Hyperdeformed and megadeformed nucleiLessons from the slow progress and emerging new strategies

J. Dudek, K. Pomorski, N. Schunck, N. Dubray

The European Physical Journal A > 2003 > 20 > 1 > 15-29

We discuss physics motivations related to hyperdeformed nuclei and more generally large nuclear deformations at high angular momenta. Possible reasons for the experimental difficulties encountered so far are discussed together with suggestions related to the new setting of priorities that combine our present-day knowledge about the behavior of hot nuclei, in particular, the Jacobi transitions, and...

article

Search for the Jacobi shape transition in light nuclei

A. Maj, M. Kmiecik, M. Brekiesz, J. Grebosz, more

The European Physical Journal A > 2003 > 20 > 1 > 165-166

The $\gamma$ -rays following the reaction 105 MeV 18O + 28Si have been measured using the EUROBALL IV, HECTOR and EUCLIDES arrays in order to investigate the predicted Jacobi shape transition. The high-energy $\gamma$ -ray spectrum from the GDR decay indicates the presence of large deformations in the hot 46Ti nucleus, in agreement with new theoretical calculations based on the rotating liquid-drop model.

article

Shell structure of cesium layer covering the C fullerene core

P. Mierzyski, K. Pomorski

The European Physical Journal D > 2002 > 21 > 3 > 311-314

Abstract: Strutinsky shell corrections for the cesium-coated fullerenes were investigated. The single particle levels of electrons are obtained using the spherical mean-field potential of a shifted Wood-Saxon type. The parameters of the potential are adjusted to reproduce the experimental ionization energies of the Cs(N) clusters and the magic numbers observed in their photo-ionization spectra of...

article

Light-particle emission from the fissioning nuclei ¹ ² ⁶ Ba, ¹ ⁸ ⁸ Pt and ² ⁶ ⁶ ^, ² ⁷ ² ^, ² ⁷ ⁸ 110: theoretical predictions and experimental results

K. Pomorski, B. Nerlo-Pomorska, A. Surowiec, M. Kowal, more

Nuclear Physics, Section A > 2000 > 679 > 1 > 25-53

We present a comparison of our model treating fission dynamics in conjunction with light-particle ( n,p,α ) evaporation with the available experimental data for the nuclei ¹ ² ⁶ Ba, ¹ ⁸ ⁸ Pt and three isotopes of the element Z=110 . The dynamics of the symmetric fission process is described through the solution of a classical Langevin equation for a single collective...

article

Nowe zastosowania efektu Barkhausena do wyznaczania stanu naprężeń w warstwie wierzchniej odlewów i części maszyn

K. Pomorski, J. Kubicki, A. Drotlew

Krzepnięcie Metali i Stopów > 2000 > R. 2, nr 44 > 515--520

Praca dotyczy zastosowań efektu Barkhausena do identyfikacji stanu naprężeń w materiałach ferromagnetycznych. Opisano zasadę działania aparatury pomiarowej, oraz prototypowego urządzenia wyznaczającego kierunki naprężeń głównych. Przedstawiono wyniki badań rozkładu wartości skutecznej napięcia szumu Barkhausena dla pewnych aplikacji przemysłowych w układzie współrzędnych biegunowych, oraz omówiono...

article

The neutron halo in heavy nuclei calculated with the Gogny force

B. Nerlo-Pomorska, K. Pomorski, J. F. Berger, J. Dechargé

The European Physical Journal A > 2000 > 8 > 1 > 19-29

The proton and neutron density distributions, one- and two-neutron separation energies and radii of nuclei for which neutron halos are experimentally observed, are calculated using the self-consistent Hartree-Fock-Bogoliubov method with the effective interaction of Gogny. Halo factors are evaluated assuming hydrogen-like antiproton wave functions. The factors agree well with experimental data. They...

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Search results for: K. Pomorski

On possible shape isomers in the Pt-Ra region of nuclei

Mass distribution of fission fragments within the Born-Oppenheimer approximation

Proton emission half-lives within a Gamow-like model

Solving the eigenvalue problem of the nuclear Yukawa-folded mean-field Hamiltonian

Remarks on the nuclear shell-correction method

Perspective on basic architectures and properties of unconventional and Field Induced Josephson junction devices

O fizyce prawie wszystkiego w stulecie odkrycia Rutherforda [wykład]

Problems in contemporary nuclear physics

Problems in contemporary nuclear physics

Experimental and theoretical investigations of quadrupole collective degrees of freedom in 104Ru

Evidence for the Jacobi shape transition in hot ⁴ ⁶ Ti

Evidence for the Jacobi shape transition in hot46Ti

Mean-field description of fusion barriers with Skyrme's interaction

$\delta$ -pairing forces and collective pairing vibrations

Hyperdeformed and megadeformed nucleiLessons from the slow progress and emerging new strategies

Search for the Jacobi shape transition in light nuclei

Shell structure of cesium layer covering the C fullerene core

Light-particle emission from the fissioning nuclei ¹ ² ⁶ Ba, ¹ ⁸ ⁸ Pt and ² ⁶ ⁶ ^, ² ⁷ ² ^, ² ⁷ ⁸ 110: theoretical predictions and experimental results

Nowe zastosowania efektu Barkhausena do wyznaczania stanu naprężeń w warstwie wierzchniej odlewów i części maszyn

The neutron halo in heavy nuclei calculated with the Gogny force

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