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The main purpose of the present work is the investigation of the α-cluster phenomenon in 16O. The 12C(6Li,d)16O reaction was measured at a bombarding energy of 25.5 MeV employing the São Paulo Pelletron-Enge-Spectrograph facility and the nuclear emulsion detection technique. Resonant states around 4α threshold were measured and an energy resolution of 15 keV allows to define states previously unresolved. The angular distributions of the absolute cross sections were determined in a range of 4-40 degree in the center of mass system. The upper limit for the resonance widths was obtained, indicating that the a cluster structure information in this region should be revised.

A cheap and efficient diagnostic system for beam monitoring has been recently developed at INFNLNS in Catania. It consists of a high sensitivity CCD camera detecting the light produced by an ion beam hitting the surface of a scintillating screen and a frame grabber for image acquisition. A scintillating screen, developed at INFN-LNS and consisting of a 2 μm BaF2 layer evaporated on an aluminium plate, has been tested by using 20Ne and 40Ar beams in the keV energy range. The CAESAR ECR ion source has been used for investigating the influence of the frequency and magnetic field tuning effects, the impact of the microwave injected power, and of the focusing solenoids along the low energy beam transport on the beam shape and current. These tests will allow to better understand the interplay between the plasma and beam dynamics and, moreover, to improve the transport efficiency along the low energy beam line and the matching with the superconducting cyclotron, particularly relevant in view of the expected upgrade of the machine. [ABSTRACT FROM AUTHOR]

Objectives: Secondary ureteropelvic junction (UPJ) obstruction after failure of open and laparoscopic repair may be challenging to resolve due to possible extensive fibrosis and the increased invasiveness of this procedure. Alternatively, ureteroscopic laser endopyelotomy may be a more acceptable procedure for patients and surgeons. We report our preliminary experience with ureteroscopic holmium laser endopyelotomy after open pyeloplasty failure and define the complications that arose and the results. Materials and Methods: We performed 6 retrograde endopyelotomies with a holmium laser for failed UPJ repairs following the Anderson-Hynes procedures. Patient follow-up was carried out every 3 months using sonography and renal scan, and again after 1 year using renal scan and urography. Results: Mean hospitalization was 2.1 days. Ureteroscopic laser endopyelotomy was successful in 4 cases (66.6%). In 2 patients, failure occurred at the third month of follow-up. Complications included 1 case of slight bleeding, which was resolved conservatively without the need for blood transfusion, and 2 cases of guidewire rupture. Conclusions: Secondary UPJ obstruction is more challenging to resolve by open or laparoscopic approach. Retrograde endopyelotomy gives a valid alternative thanks to its success rate and its better acceptance by patients. We consider retrograde laser endopyelotomy the approach to choose when faced with secondary UPJ obstruction after open or laparoscopic failures. Copyright © 2005 S. Karger AG, Basel [ABSTRACT FROM AUTHOR]