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User name rshneor
Log entry time 12:27:32 on February27,2011
Entry number 348920
keyword=HAND efficienciesa rough estimate of the neutron detection efficiencies of HAND during the Pm = 400 MeV/c kin.
top-bottom are 5mA,15mA and 20 microAmp data.
the plots on the left show the missing mass (in&out CT) and the num of events (e,e'p) events which correspont to a neutron in HAND
the plots on the right show the TOF in HAND, with the number of events in the peak.
efficiencies -
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5 microAmp
s=54 b=59 sqrt(s+b)=10 (e',p)=279.
eff=54/279 = 19% +/- 4%
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15 microAmp
s=105 b=200 sqrt(s+b)=17 (e',p)=561
eff=105/561 = 18% +/- 3%
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20 microAmp
s=155 b=322 sqrt(s+b)=21 (e,e'p)=549
eff=155/549 = 28% +/- 4%
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combined 22 % +/- 3%
the error here is calculated as - efficiency*(sqrt(tof_sig+tof_bg)/tof_sig)
this error calc neglects the (e,e'p) bg contribution to the error, which will also contribute.
FIGURE 1
