cdms-ii - CDMS Experiment - University of California, Berkeley

2.10 Plot showing fit of the band centroids, Y 0 (E R ), to the means of the
yield distributions for neutrons (diamonds) and gammas (circles). . . 41
2.11 Plots showing the fits of the widths, σ(E R ), to the standard deviation
of the yield distributions for gammas (left) and neutrons (right). . . . 41
2.12 A plot showing the use of phonon pulse shape to discriminate between
surface electron recoils with poor charge collection and bulk nuclear
recoils. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3.1 Delay plot (right) of the source configuration shown (left). The sources
are a 241 Am (large source between channels A and B) and a collimated
109 Cd (small dots). The non-circular shape of the source “blobs” indicates
the loss of resolution along the radial coordinate. The increased
density of points near the edge indicates that the radial coordinate is
piling up or even folding back. . . . . . . . . . . . . . . . . . . . . . . 46
3.2 Box plot for G31 with the 109 Cd from Fig. 3.1. The 2 inner collimator
holes in channels B and C are highlighted. The definition of the phonon
partition coordinates yields a square shape. . . . . . . . . . . . . . . . 47
3.3 Yield vs recoil plot for events shown in Fig. 3.2. The indicated points
from the 109 Cd blobs have reduced charge collection. . . . . . . . . . . 47
3.4 Delay plot (left) and box plot (top right). Events in the outer electrode
guard ring are highlighted in red prominently showing that both
location parameters are double valued. . . . . . . . . . . . . . . . . . 48
3.5 A plot for Z5 gammas of the 2D position manifold in the 3D space of
xppart, yppart, and normalized radius for a slice in yppart. Events
marked by red circles are towards the edge of the detector because
they have substantial energy in the outer electrode. Points off of the
manifold marked by green x’s are most likely internal multiple scatters. 48
xix