[en] At the LEALE laboratory a monochromatic photon beam with energy in the range 80-300 MeV is available. Photons are produced by positron annihilation on a liquid hydrogen target. The paper describes the apparatus used to change the angle of positrons on the annihilation target between 0/1.5⁰ and then the angle of the photon beam. (author)

[en] At the LEALE laboratory a monochromatic photon beam with energy in the range 80/300 MeV is available. Photons are produced by positron annihilation on a liquid hydrogen target. The characteristics of the beam are calculated for various conditions (positron energy, photon collimator, target thickness), taking into account the effects contributing to the beam spreading (energy loss and multiple scattering of protons in the annihilation target, energy distribution and angular divergence of the positron beam). (author)

[en] The status of the FI.NU.DA. (Fisica Nucleare a DAΦNE) facility of Frascati Laboratories is reviewed. The performance of FINUDA, in terms of resolution and rates of produced hypernuclei, is compared with the other existing facilities. The breakthrough in the field of hypernuclear studies, due to the unique combination of slow, monochromatic, low-background K^-'s produced at the DAΦNE φ-factory with the high resolution, large acceptance spectrometer is underlined. (orig.)

[en] The scientific program and the experimental setup of the DEAR (DAΦNE Exotic Atom Research) experiment at the new φ-factory DAΦNE of Laboratori Nazionali di Frascati, are described. The objective of DEAR is to perform a 1% measurement of the K_α line shift due to the strong interaction in kaonic hydrogen. A measurement will also be performed on kaonic deuterium for the first time. The aim is to investigate low-temperature pressurized gaseous target; and of a detector for soft X rays - the Charge-Coupled Device (CCD)-characterized by a good resolution and by an unprecedented background rejection capability. The DEAR experiment represents a major effort in the study of low energy KN interactions and has the potential to produce a breakthrough in the field

[en] The FINUDA (FIsica NUcleare a DAϕNE) experiment was built in order to study the interactions of stopped K^- on nuclei, with emphasis on Hypernuclear spectroscopy and Hypernuclei decays. Due to the nice performances of the spectrometer, it proved also suited to study, more generally, final states with several particles and able to reconstruct secondary vertices, hence greatly enlarging the physical topics that could be addressed. (author)

[en] Differential cross sections for the /sup 2/H(γ,p)n reaction were measured at five laboratory angles, from 32⁰ to 130⁰, for photon energies between 100 and 250 MeV. The LEALE quasi-monochromatic photon beam, obtained at Frascati by positron annihilation on liquid hydrogen target, was used; the photon beam spectrum was measured on-line by a pair spectrometer. Preliminary values of angular distributions and total cross sections at three laboratory photon energies are presented

[en] The photofission cross section of natural Bi was measured in the energy range 100--300 MeV by means of a quasi-monochromatic photon beam. The nuclear fissility P/sub f/ was calculated using the recently measured total photoabsorption cross sections. A discussion on the dependence of fissility from the excitation energy E/sub x/ shows that a linear dependence of lnP/sub f/ vs E/sub x//sup -1/2/ can hardly be assumed over all the considered energy range. The analysis of the data confirms this consideration and shows an evident saturation effect at high excitation energy. As a consequence, in disagreement with recent interpretations, inferring that the modified quasi-deuteron model is the only efficient mechanism in inducing fission of Bi is less compelling, and also the pion photoproduction excitation mechanism plays a role

[en] The photofission cross section of Au was determined in the energy range 100--300 MeV by means of a quasimonochromatic photon beam. The nuclear fissility P/sub f/ was calculated using the recently measured total photoabsorption cross sections. The nuclear excitation energy E/sup */, charge and mass of compound nucleus were obtained by means of an intranuclear cascade Monte Carlo calculation. The fissility values determined for Au, Bi, and U were compared with the predictions of the cascade-evaporation model and remarkably fitted by the calculation

[en] FINUDA is an experiment aiming at high resolution hypernuclear spectroscopy. It employs different types of detectors enclosed inside a large superconducting solenoid. It will operate on the new, high luminosity (e⁺ - e^-) collider DAPHINE of the INFN Frascati National Laboratory. The solenoid operates at 2765 A maximum current corresponding to a magnetic field of 1.1 T. The inner dimensions are: 2.4 m length, 2.7 m diameter. The coil within its cryostat is enclosed inside an iron return yoke composed by a central barrel and two end-caps which can be opened to access the inner detectors. The magnetic field in the inner volume has been fully mapped for both main and minor components. The alignment of such a magnet on a machine as DAPHINE is a very crucial item, needing particular care

[en] The Finuda magnet, one of the two detectors for DAΦNE, the Frascati Φ factory, is currently under construction at the Ansaldo workshops. Under general specifications granted by INFN, Ansaldo designed the complete magnetic system including cryostat, the shaped iron yoke, the data acquisition, the safety and controls, the translation trolleys for the magnet displacement out of the beam axis. The Ansaldo order will be completed with the acceptance tests at the Ansaldo premises and installation in the experimental site in Frascati. This paper describes the magnetic and mechanical design of the about 3 m diameter solenoid and its cooling method (thermosiphon), the 240 ton iron yoke, the displacement system. The state of the art of the construction processes is also reported with a special emphasis on the winding of the superconducting cable inside the aluminium support structure