Study of the 27 Al(d, α) 25 Mg and 27 Al(d, p) 28 al nuclear reactions at 2 MeV deuteron energy

Differential excitation functions and angular distributions from 30° to 150° have been measured for the27Al(d, α)26Mg and27Al(d, p)28Al reactions leading to the ground state and to the first excited states of the residual nuclei25Mg and28Al, in the deuteron energy range (1.4≪2.3) MeV. The overall energy resolution was 10 keV for the differential excitation functions and 2 0 keV for the angular distributions. Fluctuations occurring in the differential excitation functions as well as in the integrated cross-sections have been analysed on the basis of the statistical theory. In particular, with the use of correlation functions, values of Γ=(40±10)keV and θ0≃30° have been deduced for the « coherence » energy and the « coherence » angle, respectively. The theoretical values of Γ and the average values of the integrated cross-sections have been evaluated using a consistent set of parameters. The analysis showed that the predictions of the statistical model agree with the experimental results for the27Al(d, α)25Mg reactions. Both statistical and nonstatistioal effects have been found to contribute to the27Al(d, p)28Al reaction for the proton transitions leading to the low-lying levels of the residual nucleus

CO(2) laser treatment of laryngeal stenoses after reconstructive laryngectomies with cricohyoidopexy, cricohyoidoepiglottopexy or tracheohyoidoepiglottopexy.

Supracricoid laryngectomy with cricohyoidopexy (CHP) or cricohyoidoepiglottopexy (CHEP) is a conservative laryngeal surgery tailored to T1b-T2-T3 glottic-supraglottic carcinomas. Tracheohyoidopexy (THP) and tracheohyoidoepiglottopexy (THEP) allow a chance of conservative surgery also for selected transglottic carcinomas. These techniques are comprehensively named reconstructive laryngectomies (RLs). Post RL laryngeal stenosis not due to carcinoma persistence or recurrence is an unusual occurrence. The aim of the present study has been to analyse retrospectively and describe the treatment of the cases of laryngeal stenosis after RL, which occurred in Vittorio Veneto Otolaryngological Department in a 6 year period. In the period between 1999 and 2004, 225 patients underwent RL in our Department. In 18 of them (8%) a laryngeal stenosis after RL was diagnosed. The same evidence was shown in 2 patients who underwent RL in other Institutions. All patients underwent CO(2) laser surgical treatment of the laryngeal stenosis. The 14 patients who underwent RL-CHEP, the 5 patients who underwent THEP and the patient who underwent CHP were treated on average with CO(2) laser 1.2 (range 1-2), 4.2 (range 2-7), and 2 times, respectively. Decannulation was possible in all patients but one after CO(2) laser treatment of the stenosis in a mean period of 3.4 months. Laryngeal stenoses after RLs can be successfully treated with CO(2) laser excision with a very limited morbility. The only reasonable contra-indication to CO(2) laser excision could be a cranio-caudal length of the laryngeal stenotic tract longer than 1 cm: in this occurrence diagnosed after THP or THEP, an external surgical approach could be preferred