A. R. Balabekyan

Formation of residual nuclei with medium mass number in the reaction of protons with separated tin isotopes

Abstract The mechanism of formation of residual nuclei in the mass region 42≤A≤81 in the reactions of protons with separated tin isotopes at three protons energies 0.66, 1.0 and 8.1 GeV was investigated. The absolute cross-sections of the residual nuclei were compared with the theoretical ones calculated by the standard cascade-evaporation and the intranuclear cascad plus statistical multifragmentation models (INC + SMM). It was shown that at E p =8.1 GeV these nuclei may arise both from disintegration of the nucleus and as partners of several fragments.

Formation of Light Isotopes by Protons and Deuterons of 3.65 GeV/nucleon on Separated Tin Isotopes

We measure cross sections for residual nuclide formation in the mass range 7 ≤ A ≤ 96 caused by bombardment with protons and deuterons of 3.65-GeV/nucleon energy of enriched tin isotopes (112,118,120,124Sn). The experimental data are compared with calculations by the codes FLUKA, LAHET, CEM03, and LAQGSM03. Scaling behavior is observed for the whole mass region of residual nuclei, showing a possible multifragmentation mechanism for the formation of light products (7 ≤ A ≤ 30). Our analysis of the isoscaling dependence also shows a possible contribution of multifragmentation to the production of heavier nuclides, in the mass region 40 ≤ A ≤ 80.

Multimode approach to 241Am and 237Np fission induced by 660-MeV protons

The results obtained by measuring cross sections for the formation of fragments originating from 241Am and 237Np fission induced by 660-MeV protons are presented. The charge and mass distributions of fragments are analyzed within the multimode-fission model, symmetric and asymmetric fission channels being separated. The contributions of various fission components are estimated, and the fission cross sections for the 241Am and 237Np nuclei are calculated along with the fissilities of these nuclei.

Determination of the cross section for nuclear reactions in complex nuclear decay chains

In the present paper decays of genetically connected nuclei are considered and equations for their independent cross sections are derived. An optimisation parameter is proposed for an experiment where spectra of the residual nuclei are studied by the induced activity method. This parameter depends on irradiation time, delay time and spectrum measurement time.

Recoil properties of nuclei produced in the photospallation of 65Cu

Abstract Photospallation 65 Cu by bremsstrahlung photons at 4.5 GeV maximum energy has been investigated using the thick-target thick-catcher method. Kinetic properties of some product nuclei were obtained in terms of the two-step mechanism. The observed results coincide with similar data for reactions of Cu induced by 28 GeV protons. This provides additional support for the hypotheses of limiting target fragmentation and factorization.

Proton-induced fission on 241 Am, 238 U, and 237 Np at intermediate energies

Intermediate energy data of proton-induced fission on

Isomeric ratios of the cross sections for Sn(p, xpyn)X reactions

{}^{241}

Target residues formed in the 4.4 GeV deuteron-induced reaction on gold

Am,

Symmetric and asymmetric fission modes in proton-induced fission at 660 MeV of 238U

{}^{238}

Investigation of spallation reactions on 120Sn and (d, xn), (d, pxn), (p, xn), and (p, pxn) reactions on enriched tin isotopes

U, and