[en] The 600MeV and 1GeV data of proton elastic scattering on ⁴⁰Ca and ⁴⁸Ca have been analyzed in the framework of the Glauber model. The matter distributions are extracted from the data in an approximately model-independent form based on a Fourier series expansion. A similar method is used to deduce directly the ⁴⁸Ca-⁴⁰Ca neutron density difference

No abstract available

[en] The π⁺-H and π⁺-D elastic scattering excitation functions for theta sub(π)=180⁰ were measured between 130 and 280 MeV kinetic energy. The π⁺-D results show some evidence for a structure in the vicinity of 250 MeV which could be due to a dibaryon resonance formation

No abstract available

[en] At Orsay the current of polarized electrons produced by the optically pumped helium afterglow does not vary as the metastable density, but as the density squared. That shows that spurious electrons are mixed to the electrons emitted by chemi-ionization reaction of the polarized metastables with CO₂ gas. In this paper it is suggested that these spurious electrons are produced by metastable-metastable collisions. The contribution of these collisions to the electron current and polarization is evaluated. ((orig.))

[en] Because of the Half-life of ³⁶Cl (305.000 years), the measurement of the concentration of ³⁶Cl/Cl in natural samples is essential to the dating of very old ground waters. Thus, this measurement can provide an unique tool in fundamental research (such as knowledge of slow ground water movements) or in applied research (such as the evaluation of fossil water natural resources... etc...). We are more especially involved in age determination of groundwaters from confined aquifers in regions with presently arid or semi-arid climates where deep aquifers were recharged during post pluvial episodes. Accelerators as mass spectrometers have been used for approximately three years for the detection of different isotopes and especially ³⁶Cl. As a first step our group has tried to evaluate the possibilities of different accelerators by measuring the concentration ³⁶Cl/Cl of different samples prepared artificially. Then, we have begun to measure the ³⁶Cl presence in Sahara ground water samples

[en] The reactions ⁹⁰Zr, ¹¹⁶Cd(³He, n) have been analysed by adding two second-order processes to the usual one-step DWBA calculations: sequential stripping or inelastic transition followed by double stripping. These second-order contributions increase the cross sections, especially for ⁹⁰Zr, and improve the shape of the angular distribution for ¹¹⁶Cd. It shows that such second-order processes cannot be omitted in the analysis of two-particle stripping reactions. (author)

[en] The elastic and inelastic scattering of 800-MeV protons from ⁸⁹Y and ⁹⁰Zr was studied. Preliminary excitation spectra are shown, and some possible conclusions to be drawn after the data analysis are noted. 2 references

[en] Published in summary form only

[en] Using the model independent procedure, 155 MeV proton optical potentials are deduced from the elastic scattering data. The nuclear interior of these potentials are less attractative than predicted by a phenomenological potentials. A comparison is done with a self consistent meson model. (orig.)