A search for solar neutrons near solar maximum,II |
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| Authors: | Paolo Cortellessa Paolo Di Benedetto Constantinos Paizis |
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| Institution: | (1) Gruppo G.I.F.C.O. del CNR, Istituto di Fisica dell' Università, Milano, Italy |
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| Abstract: | A plastic scintillator counter with anticoincidence screen has flown in four balloon flights at a floating altitude variable between 4 and 5 mb, during night to day, day-time and night-time flights. The analysis and comparison of the day-time and night-time parts of the flights has given for the continuous emission flux an upper limit of 5.5 × 10–3 n/cm2s over the energy range from 10 MeV to 200 MeV. This upper limit is converted into upper limit differential solar neutron spectrum to be compared with the results obtained from other experiments.An irregular excess in counting rate observed in one of the flights, resulting in a day-night difference, is discussed.Finally the problems encountered in the operation of this type of detector at a high level of sensitivity are also discussed.This research has been sponsored in part by the  Air Force Cambridge Research Laboratories through the European Office of Aerospace Research, OAR, USAF under contract F61052-68-C-0050. |
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