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[en] Variational moemnt method was used to determine energy dependences of optical potential parameters for p+28Si system with account of dispersion relation between its real and imaginary parts
[en] The spectra of secondary particles accompanying the absorption of π- mesons by 28Si nuclei have been measured. This first experiment with a ''live'' target has apparently singled out the process of interest, without intranuclear rescattering, and furnished the spectrum of ''direct'' protons from the absorption event at the intranuclear pp pair
[en] This paper describes the implementation and commissioning of a device based on a new concept for measurements of nuclear reactions in inverse kinematics. The HELIcal Orbit Spectrometer, HELIOS, was commissioned at Argonne National Laboratory by studying the 28Si(d,p)29Si reaction in inverse kinematics. This experiment served as a proof of principle for this previously untested concept, and was used to verify the response and performance characteristics of HELIOS.
[en] Energy straggling is reported for deuterons in carbon and protons in silicon, and the data obtained is compared with predictions of Bohr and Bethe. The experimental method used is based on a reaction resonance widening, observed at backward angles in the thick targets. The incident energy determines the depth at which the resonant scattering occurs and the energy straggling can be measured from the backscattering spectra. The data obtained for the energy straggling of deuterons are approximately two times bigger than those predicted by Bohr's theory; nevertheless, the values found for the energy straggling of protons in silicon are in agreement with the values predicted by the aforesaid theory. This disagreement was explained by the fact that carbon targets used were amorphous and porous, in contrast with those of cristal silicon, (it is an experimental fact that porous materials are expected to give higher stragglings than non-porous ones). Thus, the method reviewed in this work is valid, but the porosity effects should be taken into account in comparing results among materials with different densities. (author)
[en] The Jacobi shape transition, an abrupt change of shape from non-collective oblate to collective triaxial or prolate shape above a critical spin (JC), has been predicted to appear in atomic nucleus due to its liquid drop nature at high excitation energy. The onset of Jacobi shape transition has been observed in a few light nuclei through the Giant Dipole Resonance (GDR) decay spectrum, characterized by a narrow low energy component ∼ 10 MeV arising due to the Coriolis splitting. Measurement of the GDR spectrum from a self-conjugate α-cluster nucleus 28Si, populated in the reaction 16O + 12C at < J> ∼ 21 ħ, which is higher than JC = 17 ħ, is carried out