BARAN, A.; LOJEWSKI, Z.; SIEJA, K.; KOWAL, M.

doi:10.1103/PhysRevC.72.044310

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BARAN, A.

LOJEWSKI, Z.

SIEJA, K.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

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Physical Review C. 2005, vol. 72, p. 044310

American Physical Society

Résumé en anglais

A systematic study of global properties of superheavy nuclei in the framework of macroscopic-microscopic method is performed. Equilibrium deformations, masses, quadrupole moments, radii, shell energies, fission barriers and half-lives are calculated using the following macroscopic models: Myers-Swiatecki liquid drop, droplet, Yukawa-plus-exponential, and Lublin-Strasbourg drop. Shell and pairing energies are calculated in Woods-Saxon potential with a universal set of parameters. The analysis covers a wide range of even-even superheavy nuclei from Z=100 to 122. Magic and semimagic numbers occurring in this region are indicated and their influence on the observables is discussed. The strongest shell effects appear at proton number Z=114 and at neutron number N=184. Deformed shell closures are found at N=152 and 162. Spontaneous fission half-lives are calculated in a dynamical approach where the full minimization of the action integral in a three-dimensional deformation space of $\beta$ deformations is performed. The fission half-lives obtained this way are two orders of magnitude smaller than the ones resulting from static calculations. The agreement of theoretical results and experimental data is satisfying.< Réduire

Mots clés en anglais

superheavy nuclei

deformed nuclei

nuclear shape

nuclear mass

quadrupole moments

nuclear electric moment

nuclear size

nuclear shell model

nuclear liquid drop model

spontaneous fission

radioactive decay periods

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Global properties of even-even superheavy nuclei in macroscopic-microscopic models

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