[en] The radiation chemical yield, G(HCl), was evaluated for chlorobenzene-based dosimetry systems irradiated by low-energy protons (3 - 5.5 MeV) and ⁶⁰Co gamma radiation under similar irradiation conditions. The irradiations were done with the Tandem Van de Graaff accelerator and the reference ⁶⁰Co gamma source. Two dosimetry systems were used in the measurements: the ECB solutions containing 10 vol. % chlorobenzene in aqueous 96 vol. % ethanol, and the CET dosimetry system containing 10 vol. % chlorobenzene, 10 vol. % ethanol and 80 vol. % trimethylpentane. The results show that the values of radiation chemical yield of hydrochloric acid, G(HCl), values for protons are lower than those for gammas. With the decrease of proton energy, the linear energy transfer (LET) increases and the reduction of G(HCl) becomes more pronounced: from lower by 5% (5.5 MeV) to lower by 14% (3.0 MeV) for the ECB system and from lower by 5% (5.0 MeV) to lower by 8% (3.0 MeV) for the CET system. (author)

[en] Current status of the search for T=1 cluster states in 1^0Be, 1^0B [1] and 1^0C is presented. The best known of the three, 1^0Be [2-4] has an established rotational band (6.18, 7.54 and 10.15 MeV) with unusually large moment of inertia. Status of their isobaric analogue in 1^0B is presented, with emphasis on 3^He+1^1Be, 7^Li+6^Li and 7^Be+6^,7Li reactions.(author)

[en] The 6^He nucleus is known [1] to have a rather exotic halo structure, with two valence neutrons and an alpha-particle core. Recent development of low-energy radioactive beams enabled use of such a loose projectile in studies of other neutron-rich light nuclei through different transfer reactions. Experimental studies performed with the 6^He beam in Louvain-la-Neuve, Belgium, will be summarised. The results of measurements with the 6^Li, 7^Li, 9^Be, 1^2C and 1^6O targets at the 6^He beam energies E=17-35 MeV will be presented and discussed. In all experiments the detector set-up consisted of highly segmented silicon strip detector arrays covering a total solid angle higher than several sr. Elastic and inelastic scatterings, transfer reactions, quasi-free scattering and sequential decay processes were studied yielding interesting results on both cluster structure of different nuclei and reactions mechanism involved. For example, the conclusive evidence for existence of very deformed molecule-like states in 1^0Be was found via 6^He+6^,7Li sequential decay reactions (and afterwards confirmed with the 6^He+4^He resonant elastic scattering [3]). Clustering of some 9^Be and 1^4C states was also studied, as well as some exotic transfer reactions, like (6^He,8^Be) [4]. In conclusion, the 6^He beam was found to be an excellent choice for studies of light exotic nuclei.(author)

[en] Because of the Coulomb barrier, reaction cross sections in astrophysics cannot be accessed directly at the relevant Gamow energies, unless very favourable conditions are met (e.g. LUNA--underground experiments). Theoretical extrapolations of available data are then needed to derive the astrophysical S(0)-factor. Various indirect processes have been used in order to obtain additional information on the parameters entering these extrapolations. The Trojan Horse Method is an indirect method which might help to bypass some of the problems typically encountered in direct measurements, namely the presence of the Coulomb barrier and the effect of the electron screening. However, a comparison with direct data in an appropriate energy region (e.g. around the Coulomb barrier) is crucial before extending the method to the relevant Gamow energy. Additionally, experimental and theoretical tests are needed to validate the assumptions underlying the method. The application of the Trojan Horse Method to some cases of interest is discussed