The 4p Detector
The DESPEC neutron 4p detector (at present identical to the NERO detector - Hendryk Schatz email@example.com and http://www.nscl.msu.edu/tech/devices/nero/tech.html) will be used for measuring the decay properties of very neutron rich nuclei with a very low production.
The assembly of the neutron detector is formed by three concentric rings of proportional counters embedded in a 60cm x 60cm x 80cm polyethylene matrix. A centred 22.4 cm diameter hole crosses the matrix to allow the entrance of the neutron beam to the assembly. Each ring of proportional counters has the following characteristics:
Ring A: Distance to the centre of the matrix, 13.6 cm. 16 3He proportional counters with an internal diameter of 2.5 cm. The walls material is stainless steel with a thickness of 0.05 cm and a length of 80 cm. Gas pressure about 4.1 bar.
Ring B: Distance to the centre of the matrix, 19.2 cm. 20 BF3 proportional counters with an internal diameter of 5.08 cm. The walls material is stainless steel with a thickness of 0.05 cm and a length of 80 cm. Gas pressure about 0.7 bar. The boron is 10B enriched at 99%.
Ring C: Distance to the centre of the matrix, 24.8 cm. 24 BF3 proportional counters with the same characteristics as the counters of the ring B.
The first Monte Carlo simulation results you can find in the report of the Universidad Politecnica de Catalunya (pdf file)
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