The silicon ball: a 4π Si detector array for reaction channel selection

Gaps in the yrast level structure of theN=50 isotonesTc93,RuRoth1, Arnell2, Foltescu3 et al. 1994Phys. Rev. CSelf Cite4915312View full textAdd to dashboardCite

“…25. Evaporated protons and o. particles were detected by a 4x Si ball consisting of 21 detectors, the total efficiency values were a~=0.80 and s =0.65 as quoted by Kuroyanagi et al [25]. At least two Compton suppressed p rays had to be detected within 100 ns in the Ge detectors together with at least one charged particle in the Si ball in order to generate a valid trigger and subsequently readout and store the events on 8-n1rn EXABYTE tapes.…”

“…This means that we had to use a very efficient particle selection system in order to detect the large number of outgoing particle combinations (21 exit channels with cross sections )1mb). Such a system [17,24] was developed for the NORDBALL detection system in a collaboration between Kyushu University, Japan [25] and Chalmers University of Technology, Sweden [26]. In the present setup the system was adapted for spectroscopy of nuclei far &om stability in the following way: In the forward hemisphere 11 liquid scintillator detectors formed a "neutron wall" [26].…”

The level structure of92Ru up to high spin values

“…As regards the detection of the charged particles it can be noted that in spite of the almost 100% detection efficiency of the 21 individual detector elements making up the Si-ball, the total efficiency values are ep= 0.80 and e~ = 0.65 as quoted by Kuroyanagi et al [5]. These values, which are in fact quite high, reflect that the beam must enter and leave the ball, the target must be fixed and also gives absorption etc.…”

“…In the forward hemisphere 11 liquid scintillator detectors formed a "neutron wall" [4]. Evaporated protons and c~-particles were detected by a 4 r~ Siball consisting of 21 detectors [5]. The master gate (open for about 100 ns) consisted of a ?…”

“…Such a system [7] was developed for the NORDBALL )'-detection system in a collaboration between Kyushu University, Japan [5] and Chalmers University of Technology, Sweden [4].…”