[en] If a heavy neutrino in the mass range of 1-10 MeV mixes significantly with ν/sub e/ then it would have produced observable events in the Kamioka detector at a time greater than a few minutes after the original events from the supernova SN1987a. On the basis of non-observation of such events, the authors derive constraints on mixing of this neutrino to ν/sub e/. The constraints obtained here are a considerable improvement over the corresponding laboratory limits

[en] Short communications only

No abstract available

[en] The author presents a model which explains all the levels of the ²⁸si spectrum below 8 MeV. (author)

No abstract available

[en] The purpose of this study is to review our experience with the use of IORT for patients with advanced cervical metastasis. Between August 1982 and July 2007, 231 patients underwent neck dissections as part of initial therapy or as salvage treatment for advanced cervical node metastases resulting from head and neck malignancies. IORT was administered as a single fraction to a dose of 15 Gy or 20 Gy in most pts. The majority was treated with 5 MeV electrons (112 pts, 50.5%). 1, 3, and 5 years overall survival (OS) after surgery + IORT was 58%, 34%, and 26%, respectively. Recurrence-free survival (RFS) at 1, 3, and 5 years was 66%, 55%, and 49%, respectively. Disease recurrence was documented in 83 (42.8%) pts. The majority of recurrences were regional (38 pts), as compared to local recurrence in 20 pts and distant failures in 25 pts. There were no perioperative fatalities. IORT results in effective local disease control at acceptable levels of toxicity. Our results support the initiation of a phase III trial comparing outcomes for patients with cervical metastasis treated with or without IORT

[en] The most important properties of the accelerator and the time schedule of the planning and construction of a new cyclotron laboratory in Debrecen are given. (P.L.)

No abstract available

No abstract available

[en] The authors are of opinion that modification of a number of the microtron assemblies will permit to use the unit under field conditions. The improvements made refer to the magnetic system modulator, accelerating chamber, high-frequency system, and a number of the circuit elements