[en] The program 'ANGULO' uses IBM-PC and At with 120K. It furnishes many kinds of histograms and many other can be easily implemented. Lindhard parametrization was used. The fitting to experimental results was very good. (A.C.A.S.)

[en] In this work, measurements were made of the incoherent Compton effect of high energy photons on K - electrons of heavy elements. The experimental arrangement consisted of a ¹³⁷CS source emitting 662 KeV photons in a lead target scattered at 123⁰. (A.C.A.S.)

[en] Published in summary form only

[en] Short communication. 5 refs

[en] Published in summary form only

[en] We measured the total destruction cross sections of HeH⁺ molecules in He and Ar (3.0 ≤ ν ≤ 5.0 au), and in Ne targets (3.0 and 4.0 au). The present data agree well with extrapolated values extracted from previous results at lower projectile velocities for He and Ne targets. The target dependence of these cross sections, irrespective of the projectile velocity, was found to be essentially given by constant multiplicative factors, roughly associated to the target atomic size. A simple projectile scaling rule, known to work for light atomic and molecular projectiles, was also found to describe the HeH⁺ cross sections well. (author)

No abstract available

[en] The dependence of the pulse height on the charge state of N projectiles was measured in two types of silicon surface barrier detectors, an ordinary one with a 40 μg/cm² gold layer and a boron implanted position sensitive detector. The projectiles were nitrogen ions N^+q (q=2-7) with energies ranging from 2.0 to 3.5 MeV. This dependence was attributed to different energy losses for ions with different incident charge states in the insensitive regions of the detector until charge equilibrium is achieved. The observed effect in the present experiment is much smaller than the prediction of the dynamical screening model. (orig.)

[en] A simple method is proposed for measuring cross-sections of fast negative atomic and molecular ions colliding with atoms and molecules. The method, applicable to tandem accelerators, uses the stripping process of the negative ions, occurring at the gas target placed in the accelerator high-voltage terminal. The target (stripper) gas pressure, not directly measurable, is measured with an improved version of a method that we have recently proposed. The total destruction cross-sections of negative atomic or molecular ion projectiles may be obtained, as well as those for each specific destruction channel. As an example of the validity of the method, we measured the destruction cross-sections of Si₂^- in Ar, from 30 keV to 1.3 MeV laboratory energies

[en] Negative ion beams have been proposed as drivers for inertial confinement fusion (ICF), as high-velocity neutral projectiles produced by photodetachment may efficiently impact and heat up a hydrogen pellet target. Charge-changing cross-sections are henceforth needed to estimate the beam attenuation in the residual gases. In this work we analyse cross section measurements for the several electron-loss collision channels of fluorine anions impinging on argon (10-50 keV/u energy range) and producing charge states from Ar⁺ to Ar⁴⁺. Cross-sections for projectile destruction associated to target ionization rise steeply with velocity, displaying a clear energy threshold. This threshold is characteristic of a collision process involving direct interaction between a projectile electron and a target electron. (authors)