Inclusive spectra of protons and α particles resulting from the interaction between 30.0-MeV protons and the 209 Bi nucleus are investigated. Double differential and integral cross sections for the (p, x p) and (p, x α) reactions are obtained and total partial cross sections for these reactions are subsequently determined. The experimental spectra are analyzed using a modified version of the exciton model of preequilibrium decay and the PRECO-2006 code. Contributions from the compound and direct mechanisms to the formation of integral cross sections are calculated.

The cross sections of inclusive reactions (p,xp) on 27Pb at Ep=30.0 MeV have been measured. The analysis of experimental data was executed on basing of exiton model. The contribution in formation of cross sections of multistep direct and compound processes has been determined.

New results have been obtained for the energy dependence of the total reaction cross section σR of 4He on 28Si in the energy range Eα ≤ 30 meV.

In the angular range 10degrees-120degrees, the angular distributions of tritons from the reaction C-13(He-3,t)(13) N induced by He-3 nuclei of energy 60 MeV are measured for transitions to the ground state (J(pi) = 1/2(-)) of the N-13 nucleus and to its excited states at E-x = 2.365 MeV (1/2(+)) and E-x = 3.51 MeV (3/2(-)) + 3.55 MeV (5/2(+)). A theoretical analysis of these data is performed within the distorted-wave method under the assumption of the one-step charge-exchange mechanism. This analysis employs a microscopic form factor that takes into account the central and tensor components of nucleon-nucleon interaction. It is shown that an acceptable description of the experimental data in question is achieved with potentials whose volume integrals do not exceed 300 MeV fm(3). (C) 2003 MAIK Nauka/Interperiodica".

In the angular range 10°–120°, the angular distributions of tritons from the reaction 13C(3He, t)13N induced by 3He nuclei of energy 60 MeV are measured for transitions to the ground state (Jπ=1/2−) of the 13N nucleus and to its excited states at Ex=2.365 MeV (1/2+) and Ex=3.51 MeV (3/2−)+3.55 MeV (5/2+). A theoretical analysis of these data is performed within the distorted-wave method under the assumption of the one-step charge-exchange mechanism. This analysis employs a microscopic form factor that takes into account the central and tensor components of nucleon-nucleon interaction. It is shown that an acceptable description of the experimental data in question is achieved with potentials whose volume integrals do not exceed 300 MeV fm3.

We describe a new technique for nuclear-radiation spectrometry and identification by the pulse's shape in CsI(Tl) scintillators. The specific α-activity of soil samples taken from the Adit 139 and the Southeast Trace of the Semipalatinsk Test Range was determined by the method of α-particle identification in a CsI(Tl) crystal at a 1-MeV detection threshold. The results were compared to the data obtained using radiochemical separation.

At energies of 50 and 60 MeV, the elastic scattering of 3He nuclei on 13C nuclei is investigated at laboratory angles in the range 10°–170°. The measured differential cross sections are analyzed on the basis of the optical model of the nucleus by using Woods-Saxon potentials, including both volume and surface absorption. The potential parameters are determined by fitting the computed cross sections to experimental data. It is found that, even in the region of sensitivity, the values of the real and imaginary parts of the potentials (V and W, respectively) show considerable scatter, with extreme values differing by a factor greater than two. This scatter is explained by the existence of a V-W ambiguity in choosing optical potentials.

Anomalous large-angle scattering of He-3 and alpha-particles on strongly clusterized nuclei such as Li-6 and Li-7 is in the main determined by the clusters exchange mechanism. This gives an opportunity to use the anomalous scattering for investigation of the cluster structure of nuclei in addition to more traditional methods such as transfer reactions (for example, (Li-6,d), (Li-6,alpha), (Li-7,alpha)) and quasielastic knockout reactions. The present contribution reports on the results of the investigation of the elastic and inelastic scattering of He-3 and alpha-particles on the Li-6 and Li-7 nuclei measured at the He-3 energies of 50, 60 and 72 MeV and alpha-particles energy of 50.5 MeV in the full angular range. It was shown that experimental angular distributions can be described only if the exchange mechanism of the elastic and inelastic transfer of the deuteron and triton clusters was taken into account. Cluster spectroscopic factors were extracted for the ground and low-lying excited states of the Li-6 and Li-7 nuclei. For the ground states the experimental values of the spectroscopic factors agree well with theoretical predictions and data from the quasielastic knockout reactions. However, for the excited states the experimental values of the d- and t-spectroscopic factors differ from theoretical ones by factor of 2-3.

The optical model and the distorted-wave methods were used to analyze experimental data on alpha-particle scattering by even-numbered zinc isotopes at 29 to 50.5 MeV. The optical potential and quadrupole and octupole deformation parameters and the differential cross sections are given. (JFP)