-
D. S. Akerib,
X. Bai,
S. Bedikian,
E. Bernard,
A. Bernstein,
A. Bolozdynya,
A. Bradley,
D. Byram,
S. B. Cahn,
C. Camp, [......],
J. R. Verbus,
N. Walsh,
R. Webb,
D. White,
J. T. White,
T. J. Whitis,
M. Wlasenko,
F. L. H. Wolfs,
M. Woods,
C. Zhang
[show abstract]
[hide abstract]
ABSTRACT: The Large Underground Xenon (LUX) collaboration has designed and constructed
a dual-phase xenon detector, in order to conduct a search for Weakly
Interacting Massive Particles(WIMPs), a leading dark matter candidate. The goal
of the LUX detector is to clearly detect (or exclude) WIMPS with a spin
independent cross section per nucleon of $2\times 10^{-46}$ cm$^{2}$,
equivalent to $\sim$1 event/100 kg/month in the inner 100-kg fiducial volume
(FV) of the 370-kg detector. The overall background goals are set to have $<$1
background events characterized as possible WIMPs in the FV in 300 days of
running.
This paper describes the design and construction of the LUX detector.
11/2012;
-
LUX Collaboration,
D. S. Akerib,
X. Bai,
E. Bernard,
A. Bernstein,
A. Bradley,
D. Byram,
S. B. Cahn,
M. C. Carmona-Benitez,
J. J. Chapman, [......],
S. Uvarov,
J. R. Verbus,
L. de Viveiros,
N. Walsh,
R. Webb,
J. T. White,
M. Wlasenko,
F. L. H. Wolfs,
M. Woods,
C. Zhang
[show abstract]
[hide abstract]
ABSTRACT: We present the results of the three-month above-ground commissioning run of
the Large Underground Xenon (LUX) experiment at the Sanford Underground
Research Facility located in Lead, South Dakota, USA. LUX is a 370 kg liquid
xenon detector that will search for cold dark matter in the form of Weakly
Interacting Massive Particles (WIMPs). The commissioning run, conducted with
the detector immersed in a water tank, validated the integration of the various
sub-systems in preparation of the underground deployment. Using the data
collected, we report excellent light collection properties, achieving 8.4
photoelectrons per keV for 662 keV electron recoils without an applied electric
field, measured in the center of the WIMP target. We also find good energy and
position resolution in relatively high-energy interactions from a variety of
internal and external sources. Finally, we have used the commissioning data to
tune the optical properties of our simulation and report updated sensitivity
projections for spin-independent WIMP-nucleon scattering.
10/2012;
-
D. S. Akerib,
X. Bai,
E. Bernard,
A. Bernstein,
A. Bradley,
D. Byram,
S. B. Cahn,
M. C. Carmona-Benitez,
D. Carr,
J. J. Chapman, [......],
M. Tripathi,
S. Uvarov,
J. R. Verbus,
N. Walsh,
R. Webb,
J. T. White,
M. Wlasenko,
F. L. H. Wolfs,
M. Woods,
C. Zhang
[show abstract]
[hide abstract]
ABSTRACT: Results are presented from radioactivity screening of two models of
photomultiplier tubes designed for use in current and future liquid xenon
experiments. The Hamamatsu 5.6 cm diameter R8778 PMT, used in the LUX dark
matter experiment, has yielded a positive detection of four common radioactive
isotopes: 238U, 232Th, 40K, and 60Co. Screening of LUX materials has rendered
backgrounds from other detector materials subdominant to the R8778
contribution. A prototype Hamamatsu 7.6 cm diameter R11410 MOD PMT has also
been screened, with benchmark isotope counts measured at <0.4 238 U / <0.3 232
Th / <8.3 40 K / 2.0+-0.2 60 Co mBq/PMT. This represents a large reduction,
equal to a change of \times 1/24 238U / \times 1/9 232Th / \times 1/8 40K per
PMT, between R8778 and R11410 MOD, concurrent with a doubling of the
photocathode surface area (4.5 cm to 6.4 cm diameter). 60Co measurements are
comparable between the PMTs, but can be significantly reduced in future R11410
MOD units through further material selection. Assuming PMT activity equal to
the measured 90% upper limits, Monte Carlo estimates indicate that replacement
of R8778 PMTs with R11410 MOD PMTs will change LUX PMT electron recoil
background contributions by a factor of \times1/25 after further material
selection for 60Co reduction, and nuclear recoil backgrounds by a factor of
\times 1/36. The strong reduction in backgrounds below the measured R8778
levels makes the R11410 MOD a very competitive technology for use in
large-scale liquid xenon detectors.
05/2012;
-
CDMS Collaboration,
Z. Ahmed,
D. S. Akerib,
A. J. Anderson,
S. Arrenberg,
C. N. Bailey,
D. Balakishiyeva,
L. Baudis,
D. A. Bauer,
P. L. Brink, [......],
D. Speller,
K. M. Sundqvist,
M. Tarka,
R. B. Thakur,
A. N. Villano,
B. Welliver,
S. Yellin,
J. Yoo,
B. A. Young,
J. Zhang
[show abstract]
[hide abstract]
ABSTRACT: We report limits on annual modulation of the low-energy event rate from the
Cryogenic Dark Matter Search (CDMS II) experiment at the Soudan Underground
Laboratory. Such a modulation could be produced by interactions from Weakly
Interacting Massive Particles (WIMPs) with masses ~10 GeV/c^2. We find no
evidence for annual modulation in the event rate of veto-anticoincident
single-detector interactions consistent with nuclear recoils, and constrain the
magnitude of any modulation to <0.06 event [keVnr kg day]^-1 in the 5-11.9
keVnr energy range at the 99% confidence level. These results disfavor an
explanation for the reported modulation in the 1.2-3.2 keVee energy range in
CoGeNT in terms of nuclear recoils resulting from elastic scattering of WIMPs
at >98% confidence. For events consistent with electron recoils, no significant
modulation is observed for either single- or multiple-detector interactions in
the 3.0-7.4 keVee range.
03/2012;
-
D. S. Akerib,
X. Bai,
S. Bedikian,
E. Bernard,
A. Bernstein,
A. Bradley,
S. B. Cahn,
M. C. Carmona-Benitez,
D. Carr,
J. J. Chapman, [......],
M. Tripathi,
J. R. Verbus,
N. Walsh,
R. Webb,
J. T. White,
M. Wlasenko,
F. L. H. Wolfs,
M. Woods,
S. Uvarov,
C. Zhang
[show abstract]
[hide abstract]
ABSTRACT: We report on the screening of samples of titanium metal for their
radio-purity. The screening process described in this work led to the selection
of materials used in the construction of the cryostats for the Large
Underground Xenon (LUX) dark matter experiment. Our measurements establish
titanium as a highly desirable material for low background experiments
searching for rare events. The sample with the lowest total long-lived activity
was measured to contain <0.25 mBq/kg of U-238, <0.2 mBq/kg of Th-232, and <1.2
mBq/kg of K-40. Measurements of several samples also indicated the presence of
short-lived (84 day half life) Sc-46, likely produced cosmogenically via muon
initiated (n,p) reactions.
12/2011;
-
D. S. Akerib,
X Bai,
S. Bedikian,
E. Bernard,
A Bernstein,
A Bradley,
S. B. Cahn,
M. C. Carmona-Benitez,
D. Carr,
J. J. Chapman, [......],
J. Thomson,
M Tripathi,
J. R. Verbus,
N. Walsh,
R Webb,
J.T. White,
M. Wlasenko,
F. L. H. Wolfs,
M Woods,
C Zhang
[show abstract]
[hide abstract]
ABSTRACT: Geant4 has been used throughout the nuclear and high-energy physics community
to simulate energy depositions in various detectors and materials. These
simulations have mostly been run with a source beam outside the detector. In
the case of low-background physics, however, a primary concern is the effect on
the detector from radioactivity inherent in the detector parts themselves. From
this standpoint, there is no single source or beam, but rather a collection of
sources with potentially complicated spatial extent. LUXSim is a simulation
framework used by the LUX collaboration that takes a component-centric approach
to event generation and recording. A new set of classes allows for multiple
radioactive sources to be set within any number of components at run time, with
the entire collection of sources handled within a single simulation run.
Various levels of information can also be recorded from the individual
components, with these record levels also being set at runtime. This
flexibility in both source generation and information recording is possible
without the need to recompile, reducing the complexity of code management and
the proliferation of versions. Within the code itself, casting geometry objects
within this new set of classes rather than as the default Geant4 classes
automatically extends this flexibility to every individual component. No
additional work is required on the part of the developer, reducing development
time and increasing confidence in the results. We describe the guiding
principles behind LUXSim, detail some of its unique classes and methods, and
give examples of usage.
* Corresponding author, kareem@llnl.gov
11/2011;
-
D. C. Malling,
D. S. Akerib,
H. M. Araujo,
X Bai,
S. Bedikian,
E. Bernard,
A Bernstein,
A Bradley,
S. B. Cahn,
M. C. Carmona-Benitez, [......],
J. Thomson,
M Tripathi,
J. R. Verbus,
N. Walsh,
R Webb,
J.T. White,
M. Wlasenko,
F. L. H. Wolfs,
M Woods,
C Zhang
[show abstract]
[hide abstract]
ABSTRACT: The LZ program consists of two stages of direct dark matter searches using
liquid Xe detectors. The first stage will be a 1.5-3 tonne detector, while the
last stage will be a 20 tonne detector. Both devices will benefit tremendously
from research and development performed for the LUX experiment, a 350 kg liquid
Xe dark matter detector currently operating at the Sanford Underground
Laboratory. In particular, the technology used for cryogenics and electrical
feedthroughs, circulation and purification, low-background materials and
shielding techniques, electronics, calibrations, and automated control and
recovery systems are all directly scalable from LUX to the LZ detectors.
Extensive searches for potential background sources have been performed, with
an emphasis on previously undiscovered background sources that may have a
significant impact on tonne-scale detectors. The LZ detectors will probe
spin-independent interaction cross sections as low as 5E-49 cm2 for 100 GeV
WIMPs, which represents the ultimate limit for dark matter detection with
liquid xenon technology.
10/2011;
-
D. S. Akerib,
X Bai,
S. Bedikian,
E. Bernard,
A Bernstein,
A Bradley,
S. B. Cahn,
M. C. Carmona-Benitez,
D. Carr,
J. J. Chapman, [......],
J. Thomson,
M Tripathi,
J. R. Verbus,
N. Walsh,
R Webb,
J.T. White,
M. Wlasenko,
F. L. H. Wolfs,
M Woods,
C Zhang
[show abstract]
[hide abstract]
ABSTRACT: LUX is a two-phase (liquid/gas) xenon time projection chamber designed to
detect nuclear recoils from interactions with dark matter particles. Signals
from the LUX detector are processed by custom-built analog electronics which
provide properly shaped signals for the trigger and data acquisition (DAQ)
systems. The DAQ is comprised of commercial digitizers with firmware customized
for the LUX experiment. Data acquisition systems in rare-event searches must
accommodate high rate and large dynamic range during precision calibrations
involving radioactive sources, while also delivering low threshold for maximum
sensitivity. The LUX DAQ meets these challenges using real-time baseline sup-
pression that allows for a maximum event acquisition rate in excess of 1.5 kHz
with virtually no deadtime. This paper describes the LUX DAQ and the novel
acquisition techniques employed in the LUX experiment.
08/2011;
-
Z Ahmed,
D S Akerib,
S Arrenberg,
C N Bailey,
D Balakishiyeva,
L Baudis,
D A Bauer,
P L Brink,
T Bruch,
R Bunker, [......],
M Kiveni,
M Kos,
S W Leman,
S Liu,
R Mahapatra,
V Mandic,
K A Mccarthy,
N Mirabolfathi,
D Moore, H Nelson
[show abstract]
[hide abstract]
ABSTRACT: Results are presented from a reanalysis of the entire five-tower data set acquired with the Cryo-genic Dark Matter Search (CDMS II) experiment at the Soudan Underground Laboratory, with an exposure of 969 kg-days. The analysis window was extended to a recoil energy of 150 keV, and an improved surface-event background-rejection cut was defined to increase the sensitivity of the experiment to the inelastic dark matter (iDM) model. Three dark matter candidates were found between 25 keV and 150 keV. The probability to observe three or more background events in this energy range is 11%. Because of the occurrence of these events the constraints on the iDM param-eter space are slightly less stringent than those from our previous analysis, which used an energy window of 10–100 keV.
07/2011; 18(11):14-15.
-
Z Ahmed,
D S Akerib,
S Arrenberg,
C N Bailey,
D Balakishiyeva,
L Baudis,
D A Bauer,
P L Brink,
T Bruch,
R Bunker, [......],
M Kiveni,
M Kos,
S W Leman,
S Liu,
R Mahapatra,
V Mandic,
K A Mccarthy,
N Mirabolfathi,
D Moore, H Nelson
[show abstract]
[hide abstract]
ABSTRACT: Results are presented from a reanalysis of the entire five-tower data set acquired with the Cryo-genic Dark Matter Search (CDMS II) experiment at the Soudan Underground Laboratory, with an exposure of 969 kg-days. The analysis window was extended to a recoil energy of 150 keV, and an improved surface-event background-rejection cut was defined to increase the sensitivity of the experiment to the inelastic dark matter (iDM) model. Three dark matter candidates were found between 25 keV and 150 keV. The probability to observe three or more background events in this energy range is 11%. Because of the occurrence of these events the constraints on the iDM param-eter space are slightly less stringent than those from our previous analysis, which used an energy window of 10–100 keV.
07/2011; 18(11):14-15.
-
CDMS,
EDELWEISS Collaborations: Z. Ahmed,
D. S. Akerib,
E. Armengaud,
S. Arrenberg,
C. Augier,
C. N. Bailey,
D. Balakishiyeva,
L. Baudis,
D. A. Bauer, [......],
A. S. Torrento-Coello,
L. Vagneron,
M-A. Verdier,
R. J. Walker,
P. Wikus,
E. Yakushev,
S Yellin,
J Yoo,
B. A. Young,
J Zhang
[show abstract]
[hide abstract]
ABSTRACT: The CDMS and EDELWEISS collaborations have combined the results of their
direct searches for dark matter using cryogenic germanium detectors. The total
data set represents 614 kg.d equivalent exposure. A straightforward method of
combination was chosen for its simplicity before data were exchanged between
experiments. The results are interpreted in terms of limits on spin-independent
WIMP-nucleon cross-section. For a WIMP mass of 90 GeV/c^2, where this analysis
is most sensitive, a cross-section of 3.3 x 10^{-44} cm^2 is excluded at 90%
CL. At higher WIMP masses, the combination improves the individual limits, by a
factor 1.6 above 700 GeV/c^2. Alternative methods of combining the data provide
stronger constraints for some ranges of WIMP masses and weaker constraints for
others.
Physical Review D 05/2011; 84:011102. · 4.56 Impact Factor
-
Z Ahmed,
D S Akerib,
S Arrenberg,
C N Bailey,
D Balakishiyeva,
L Baudis,
D A Bauer,
P L Brink,
T Bruch,
R Bunker, [......],
R W Schnee,
D N Seitz,
B Serfass,
K M Sundqvist,
M Tarka,
P Wikus,
S Yellin,
J Yoo,
B A Young,
J Zhang
[show abstract]
[hide abstract]
ABSTRACT: We report results from a reanalysis of data from the Cryogenic Dark Matter Search (CDMS II) experiment at the Soudan Underground Laboratory. Data taken between October 2006 and September 2008 using eight germanium detectors are reanalyzed with a lowered, 2 keV recoil-energy threshold, to give increased sensitivity to interactions from weakly interacting massive particles (WIMPs) with masses below ∼10 GeV/c(2). This analysis provides stronger constraints than previous CDMS II results for WIMP masses below 9 GeV/c(2) and excludes parameter space associated with possible low-mass WIMP signals from the DAMA/LIBRA and CoGeNT experiments.
Physical Review Letters 04/2011; 106(13):131302. · 7.37 Impact Factor
-
CDMS Collaboration,
Z. Ahmed,
D. S. Akerib,
S. Arrenberg,
C. N. Bailey,
D. Balakishiyeva,
L. Baudis,
D. A. Bauer,
P. L. Brink,
T. Bruch, [......],
R. W. Schnee,
D. N. Seitz,
B Serfass,
K. M. Sundqvist,
M. Tarka,
P. Wikus,
S Yellin,
J Yoo,
B. A. Young,
J Zhang
[show abstract]
[hide abstract]
ABSTRACT: Results are presented from a reanalysis of the entire five-tower data set
acquired with the Cryogenic Dark Matter Search (CDMS II) experiment at the
Soudan Underground Laboratory, with an exposure of 969 kg-days. The analysis
window was extended to a recoil energy of 150 keV, and an improved
surface-event background-rejection cut was defined to increase the sensitivity
of the experiment to the inelastic dark matter (iDM) model. Three dark matter
candidates were found between 25 keV and 150 keV. The probability to observe
three or more background events in this energy range is 11%. Because of the
occurrence of these events the constraints on the iDM parameter space are
slightly less stringent than those from our previous analysis, which used an
energy window of 10-100 keV.
12/2010;
-
CDMS Collaboration,
D. S. Akerib,
M J Attisha,
L. Baudis,
D. A. Bauer,
A. I. Bolozdynya,
P. L. Brink,
R. Bunker,
B. Cabrera,
D O Caldwell, [......],
B Sadoulet,
J. Sander,
C Savage,
R. W. Schnee,
D. N. Seitz,
T. A. Shutt,
G Wang,
S Yellin,
J Yoo,
B. A. Young
[show abstract]
[hide abstract]
ABSTRACT: Data taken during the final shallow-site run of the first tower of the
Cryogenic Dark Matter Search (CDMS II) detectors have been reanalyzed with
improved sensitivity to small energy depositions. Four ~224 g germanium and two
~105 g silicon detectors were operated at the Stanford Underground Facility
(SUF) between December 2001 and June 2002, yielding 118 live days of raw
exposure. Three of the germanium and both silicon detectors were analyzed with
a new low-threshold technique, making it possible to lower the germanium and
silicon analysis thresholds down to the actual trigger thresholds of ~1 keV and
~2 keV, respectively. Limits on the spin-independent cross section for weakly
interacting massive particles (WIMPs) to elastically scatter from nuclei based
on these data exclude interesting parameter space for WIMPs with masses below 9
GeV/c^2. Under standard halo assumptions, these data partially exclude
parameter space favored by interpretations of the DAMA/LIBRA and CoGeNT
experiments' data as WIMP signals, and exclude new parameter space for WIMP
masses between 3 GeV/c^2 and 4 GeV/c^2.
10/2010;
-
Z Ahmed,
D S Akerib,
S Arrenberg,
C N Bailey,
D Balakishiyeva,
L Baudis,
D A Bauer,
P L Brink,
T Bruch,
R Bunker, [......],
R W Schnee,
D N Seitz,
B Serfass,
K M Sundqvist,
M Tarka,
P Wikus,
S Yellin,
J Yoo,
B A Young,
J Zhang
[show abstract]
[hide abstract]
ABSTRACT: Astrophysical observations indicate that dark matter constitutes most of the mass in our universe, but its nature remains unknown. Over the past decade, the Cryogenic Dark Matter Search (CDMS II) experiment has provided world-leading sensitivity for the direct detection of weakly interacting massive particle (WIMP) dark matter. The final exposure of our low-temperature germanium particle detectors at the Soudan Underground Laboratory yielded two candidate events, with an expected background of 0.9 +/- 0.2 events. This is not statistically significant evidence for a WIMP signal. The combined CDMS II data place the strongest constraints on the WIMP-nucleon spin-independent scattering cross section for a wide range of WIMP masses and exclude new parameter space in inelastic dark matter models.
Science 02/2010; 327(5973):1619-21. · 31.20 Impact Factor
-
P. L. Brink,
Z. Ahmed,
D. S. Akerib,
C. N. Bailey,
D. Balakishiyeva,
D. A. Bauer,
J. Beaty,
R. Bunker,
B. Cabrera,
D. O. Caldwell, [......],
R. W. Schnee,
D. N. Seitz,
B. Serfass,
K. M. Sundqvist,
A. Tomada,
G. Wang,
P. Wikus,
S. Yellin,
J. Yoo,
B. A. Young
[show abstract]
[hide abstract]
ABSTRACT: The CDMS collaboration utilizes Ge detectors for their Weakly Interacting Massive Particle (WIMP) search at the Soudan mine, Minnesota. The final data run of CDMS II is complete and a detector upgrade for SuperCDMS has commenced. A SuperTower of five 1‐inch thick Ge crystals has been installed and undergoing commissioning. Its surface‐event rejection capability should allow SuperCDMS to continue to run background free for the next proposed phases: 15 kg Ge deployment at Soudan, and up to 150 kg Ge deployment at SNOLAB. Recent detector advances to allow a 1 tonne Ge experiment are also discussed.
AIP Conference Proceedings. 12/2009; 1182(1):260-263.
-
N. Mirabolfathi,
Z. Ahmed,
D. S. Akerib,
S. Arrenberg,
C. N. Bailey,
D. Balakishiyeva,
L. Baudis,
D. A Bauer,
J. Beaty,
P. L. Brink, [......],
B. Sadoulet,
J. Sanders,
R. W. Schnee,
D. N. Seitz,
B. Serfass,
K. M. Sundqvist,
G. Wang,
S. Yellin,
J. Yoo,
B. A. Young
[show abstract]
[hide abstract]
ABSTRACT: The Cryogenic Dark Matter Search experiment (CDMS) is using Phonon+Ionization detectors to search for Dark Matter in the form of Weakly Interactive Massive Particles (WIMPs). We report on new results from the operation of CDMS five “towers” at Soudan underground laboratory. With new and more massive detectors, SuperCDMS project has been started since March 2009. We report on the current status of SuperCDMS and its perspective.
AIP Conference Proceedings. 12/2009; 1185(1):623-626.
-
P. L. Brink,
Z. Ahmed,
D. S. Akerib,
C. N. Bailey,
D. Balakishiyeva,
D. A. Bauer,
J. Beaty,
R. Bunker,
B. Cabrera,
D. O. Caldwell, [......],
R. W. Schnee,
D. N. Seitz,
B. Serfass,
K. M. Sundqvist,
A. Tomada,
G. Wang,
P. Wikus,
S. Yellin,
J. Yoo,
B. A. Young
[show abstract]
[hide abstract]
ABSTRACT: For its dark matter search the SuperCDMS collaboration has developed new
Ge detectors using the same athermal phonon sensors and ionization
measurement technology of CDMS II but with larger mass, superior sensor
performance and increased fabrication efficiency. The improvements in
fabrication are described, a comparison of CDMS II and SuperCDMS
detector production yield is reported, and future scalability addressed.
11/2009; 1185:655-658.
-
Z Ahmed,
D S Akerib,
S Arrenberg,
C N Bailey,
D Balakishiyeva,
L Baudis,
D A Bauer,
J Beaty,
P L Brink,
T Bruch, [......],
J Sander,
R W Schnee,
D N Seitz,
B Serfass,
K M Sundqvist,
M Tarka,
G Wang,
S Yellin,
J Yoo,
B A Young
[show abstract]
[hide abstract]
ABSTRACT: We report on the first axion search results from the Cryogenic Dark Matter Search (CDMS) experiment at the Soudan Underground Laboratory. An energy threshold of 2 keV for electron-recoil events allows a search for possible solar axion conversion into photons or local galactic axion conversion into electrons in the germanium crystal detectors. The solar axion search sets an upper limit on the Primakov coupling g(agammagamma) of 2.4x10(-9) GeV-1 at the 95% confidence level for an axion mass less than 0.1 keV/c2. This limit benefits from the first precise measurement of the absolute crystal plane orientations in this type of experiment. The galactic axion search analysis sets a world-leading experimental upper limit on the axioelectric coupling g(aee) of 1.4x10(-12) at the 90% confidence level for an axion mass of 2.5 keV/c2.
Physical Review Letters 10/2009; 103(14):141802. · 7.37 Impact Factor
-
Z. Ahmed,
D. S. Akerib,
S. Arrenberg,
C. N. Bailey,
D. Balakishiyeva,
L. Baudis,
D. A. Bauer,
J Beaty,
P. L. Brink,
T. Bruch, [......],
J. Sander,
R. W. Schnee,
D. N. Seitz,
B Serfass,
K. M. Sundqvist,
G Wang,
S Yellin,
J Yoo,
B. A. Young,
The CDMS Collaboration
[show abstract]
[hide abstract]
ABSTRACT: We report on the analysis of the low-energy electron-recoil spectrum from the CDMS II experiment using data with an exposure of 443.2 kg-days. The analysis provides details on the observed counting rate and possible background sources in the energy range of 2 - 8.5 keV. We find no significant excess in the counting rate above background, and compare this observation to the recent DAMA results. In the framework of a conversion of a dark matter particle into electromagnetic energy, our 90% confidence level upper limit of 0.246 events/kg/day at 3.15 keV is lower than the total rate above background observed by DAMA by 8.9$\sigma$. In absence of any specific particle physics model to provide the scaling in cross section between NaI and Ge, we assume a Z^2 scaling. With this assumption the observed rate in DAMA differs from the upper limit in CDMS by 6.8$\sigma$. Under the conservative assumption that the modulation amplitude is 6% of the total rate we obtain upper limits on the modulation amplitude a factor of ~2 less than observed by DAMA, constraining some possible interpretations of this modulation. Comment: 4 pages, 3 figures
07/2009;
