s393/land02 workshop 2011

Within the s393 experiment, a 4pi gamma detector (known as Crystal Ball), consisting of an array of 162 NaI crystals surrounding the reaction target, is used for measuring the gamma rays emitted by the de-exciting fragment after quasifree reactions. During the gamma energy calibration stage of this detector, we performed some changes in the already known scripts used for this matter, due to...

The current algorithms, to perform the addback summation of the gamma interaction depositing energy in several stages and in several adjacent crystals, search for clusters of energy in crystals, using the one found with most energy to make the Doppler correction. The present work aim is to first study and obtain the gamma distribution within the crystal ball. In continuation an improved ...

Three different methods for the efficiency calibration of the gamma branch of the Crystal Ball detector have been automated and tested with the s393/s389 calibration data. The three different methods produce differing results. The causes of the different results have been identified. This leaves one method providing reliable efficiency calibration points at 1.18 MeV and 1.33 MeV for the...