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Bound beta decay experiment on Tl-205 |
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Message ID: 104
Entry time: Mon Mar 30 23:30:35 2020
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Author: |
Jan |
Category: |
Analysis |
Subject: |
run251 - Si-pad performance & status |
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Attached are plots for Si-pad 2 with hits from ionization of 206Pb81+ at the target.
The plots are representative for all Si-pads, the pattern is always the same!
y-axis: E n-side
x-axis: E p-side strip
condition: E_gate on peak in CsI
While strips 1, 2 and 7 look fine, strips 3 and 6 show already signs of degradation.
For strips 4 and 5, it is clearly visible that something is wrong.
Those are the central strips, which probably see the most rate.
The same dataset was analyzed here: https://elog.gsi.de/esr/E121/62
This might be a hint to a radiation damage or to the fact that we operate at too low bias voltage (32 Volt).
Maybe it recovers if we increase bias to 60 Volt. |
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