Detector filling status
Materials measurements
Light attenuation length (440 nm) as a function of time for PV scintillator
Light attenuation length (440 nm) as a function of time for CIT scintillator
Dynode linearity of near EMI tubes
Dynode linearity of far EMI tubes
Time development of s.p.e. peaks PV EMI PMTs. Both banks both sides.
Stability of reference cells through 228Th calibrations.
Time development of the slopes of the EMI anode channel number fitted against the Philips
reference tube channel number.
Slope of the linear
time development is given. For the far side the slope is multiplied with the
ratio of near/far intercept to cancel overall differences in light level due
differences of the fibers.
Time development of the EMI polynomial dynode fiber fits. Red lines correspond to
bank 1, blue lines to bank 2 data, respectively. The vertical lines correspond to
10 MeV deposited 1 m from the PMT. This energy was calculated using Th Compton edge positions,
measured in August 98. The dynode calibration was derived fom run 10938.
Time development of the EMI polynomial dynode fiber fits. Red lines correspond to
bank 1, blue lines to bank 2 data, respectively. Fitted linearization divided by
the polynomial of the first fiber scan. This gives the change over time quantitatively.
The upper limit of the plots corresponds to 10 MeV deposited 1 m from the PMT.
Those PMTs showing large instabilities have fiber scans extending to only small
amplitudes (low fiber brightness) and need, hence, extrapolated points at large
amplitudes.
Palo Verde exclusion plot. 1998 data.
Time development of background rates. (1) Neutrino cuts applied except
a time correlation of itslv/1000 < 150 mus instead of a veto cut.
(2) Side cell cuts lifted and annihilation like energy between 1.2 and
20 MeV. (3) same as (2) except veto reversed: itslv/1000 < 150 mus instead
of a veto cut.
Time development of trigger rate and muon veto rate.
Anode fiber scan 12453.
Specific Rn activity of lab. air in Palo Verde as measured during
1999-2000.
Time development of rate with neutrino cuts applied. Veto cut
disabled to get higher event rates.
Random background rate determined by integrating the number of events with an
inter event time larger than 200 mus and smaller than 390 mus. Binning as
defined by Stanford ntuples. Top figure neutrino cuts, bottom figure veto
cut disabled to enhance statistics.