No abstract available

[en] Fifteen years of studies of the exclusive reactions (N,π) have brought many hopes and more disappointments. This paper presents a critical review to point out the relevant progress achieved in the theoretical and experimental fields. A special attention is paid to a systematic phenomenological study of the experimental results of the reaction (p,π⁺) on some nuclei pointing out some aspects of the reaction mechanism. 24 refs

[en] The number of neutrons produced per incident proton in the spallation of Pb targets is of direct relevance to the design of accelerator breeders. The nuclear cascade initiated by high-energy protons in spallation targets is usually described by an intranuclear cascade evaporation (INCE) model. Even though this model describes various average nuclear properties of spallation targets fairly well, differential quantities such as energy spectra, angular spectra etc., are not reproduced within the limits of experimental uncertainty. One of the reasons for this is the uncertainty in the magnitude of the parameters involved in the model, notably the level density parameter Bsub(O) whose magnitude is quoted by different workers to be in the range of 8-20 MeV. The accuracy of Bsub(O) could be improved if we could experimentally determine a quantity which is much more sensitive to Bsub(O) than the average neutron yield. In this paper we discuss one such quantity, namely the neutron multiplicity spectrum (MS). We compute the MS due to the spallation of Pb targets of different sizes at proton energies of 1.5, 1.0 and 0.59 GeV using the Monte Carlo code HETC. It is noticed that for the 1.5 GeV proton case the probability P(ν) for leakage of ν neutrons for ν in the range of 60-65, changes by about 70% when Bsub(O) is varied from 8 to 20 MeV. The corresponding change in the average neutron yield is <20%. It is therefore suggested that an accurate measurement of the MS can serve as a useful tool to narrow down the range of uncertainty in the Bsub(O) parameter. (author)

[en] For many decades, efforts have been made to measure the absolute ion induced electron emission (IIEE) yields, y, the number of emitted electrons per incident ion, for protons on elemental metals. One of the most widely studied surfaces has been polycrystalline copper. New measurements for the IIEE yield from polycrystalline copper samples following annealing (T=390 degrees C) and light sputtering (∼ 10¹⁴ ions/cm²) have been made. The yield was found to be 1.58 ± 0.01 e/ion. This is 10% lower than the most widely published values for y which were obtained from heavily sputtered and unannealed samples. The reduced yield found in the present study is attributed to the absence of significant sputter-induced surface damage

[en] Possibility of relict free qUark search by means of their knocking out from a substance by intensive beam of protons with subsequent recording has been considered. The process of quark production in the form of anomalons during nucleus fragmentation is explained qualitatively. Evaluation of the number of events in the experiment, which proved to be equal to one event per day, is made

[en] The process of fast deuteron production in proton-nucleus interactions is considered in the framework of the coalescence model. The space-time picture of the reaction, the deuteron realistic wave function, and nucleon-nucleon correlations are taken into account. The results of calculations are in satisfactory agreement with a large set of experimental data on the production of fast deuterons. However, in the region of small relative distances of the emitted nucleons a significant discrepancy with experiment is observed. 45 refs., 5 figs., 2 tabs

[en] The document contains 3 papers on the measurement and calculation of neutron and proton reactions cross sections. A separate abstract was prepared for each paper. Refs, figs and tabs

[en] The correlation functions for fast proton pairs with small relative momentum are calculated with allowance for the interaction between the protons in the final state. The distributions of proton pairs detectable with the Positronium instrument are modeled. It is shown that it is possible to study the sizes of fast-proton emission sources using this instrument by the correlation method for secondary-proton momenta p≤ 2.5 GeV/c, which are two times higher than the momentum range accessible to bubble chambers. 11 refs., 5 figs

No abstract available

[en] It is demonstrated by extensive calculational experiments that the volume-absorptive optical potential conventionally employed for the triton has a singular property when it is used in the zero-range DWBA calculation of the (p,tsub(o)) angular distribution, in contrast with the surface-absorptive optical potential. Implications of this fact are discussed. (author)