Fission barriers and other characteristics of nuclei from the uranium region


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Аннотация

Fission barriers in nuclei belonging to the uranium region and their other characteristics are calculated on the basis of the FaNDF0 energy density functional. In particular, the neutron-separation energies Sn and S2n, the proton-separation energies Sp, and the beta-transition energiesQβ are calculated for uranium, neptunium, and plutonium isotopes. In addition, the deformation energies and parameters of these nuclei are presented along with their radii. A comparison with the predictions of the Skyrme–Hartree–Fock method implemented with several versions of the Skyrme energy density functionals is performed. The role of the octupole deformation β3 is studied for the 238U nucleus. It is shown that this deformation does not have any significant effect on the first-barrier height B(1)f or ground-state properties. At the same time, the second-barrier height B(2) f decreases by a factor of about two upon taking into account β3. A phase transition at A ~ 260 is found for the three isotopic chains being considered: this point is a bifurcation point at which B(1)f (A) forks into two curves. Of these, the curve B(2)f (A) splits from it, prolonging the former curve for B(1)f (A) almost continuously, whereas the curve for B(1)f (A) itself goes down sharply.

Авторлар туралы

S. Tolokonnikov

National Research Center Kurchatov Institute; Moscow Institute of Physics and Technology (State University)

Email: saper@mbslab.kiae.ru
Ресей, pl. Akademika Kurchatova 1, Moscow, 123182; Institutskii per. 9, Dolgoprudnyi, Moscow oblast, 141700

I. Borzov

National Research Center Kurchatov Institute; Joint Institute for Nuclear Research

Email: saper@mbslab.kiae.ru
Ресей, pl. Akademika Kurchatova 1, Moscow, 123182; ul. Joliot-Curie 6, Dubna, Moscow oblast, 141980

Yu. Lutostansky

National Research Center Kurchatov Institute

Email: saper@mbslab.kiae.ru
Ресей, pl. Akademika Kurchatova 1, Moscow, 123182

I. Panov

National Research Center Kurchatov Institute; Institute for Theoretical and Experimental Physics

Email: saper@mbslab.kiae.ru
Ресей, pl. Akademika Kurchatova 1, Moscow, 123182; Bol’shaya Cheremushkinskaya ul. 25, Moscow, 117218

E. Saperstein

National Research Center Kurchatov Institute; National Research Nuclear University MEPhI

Хат алмасуға жауапты Автор.
Email: saper@mbslab.kiae.ru
Ресей, pl. Akademika Kurchatova 1, Moscow, 123182; Kashirskoe sh. 31, Moscow, 115409

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