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1. Surface Event Rejection Using Phonon Information in CDMS

Author

Miguel Daal, C. Savage, Laura Baudis, A. Lu, M. Pyle, R. Hennings-Yeomans, Darren Grant, Ronald R. Ross, Thushara Perera, Bernard Sadoulet, S. J. Yellin, H. N. Nelson, Betty A. Young, S. Leclercq, M. R. Dragowsky, K. M. Sundqvist, C. N. Bailey, Vuk Mandic, N. Mirabolfathi, R. H. Nelson, D. D. Driscoll, M. J. Attisha, R. Ferril, P. Cushman, Sunil Golwala, Donald J. Holmgren, D. O. Caldwell, S. Kamat, D. A. Bauer, J. Sander, D. N. Seitz, J. P. F. Thompson, D. S. Akerib, Blas Cabrera, Bruno Serfass, R. Bunker, J. Yoo, Chihway Chang, R. J. Gaitskell, Jodi Cooley, R. L. Dixon, R. Mahapatra, R. W. Schnee, G. Wang, M. B. Crisler, A. Reisetter, W. Rau, P. Meunier, P. P. Brusov, E. J. Ramberg, Jeffrey P. Filippini, P. L. Brink, R. W. Ogburn, L. Duong, and Martin E. Huber

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, WIMP, Phonon, Estimator, Figure of merit, Acoustic Phonons, Signal edge, Atomic and Molecular Physics, and Optics, Simulation
Abstract

The published CDMS analyses have used the shape of the phonon signal rising edge to reject low-ionization-yield surface events which produce acoustic phonons more quickly than bulk events do. To achieve better WIMP sensitivity with future larger exposures, we are using a simplified model of phonon production and propagation to construct event position estimators that help us to find more efficient surface event rejection cuts. We describe this model and the resulting new cuts, and summarize the surface event leakage rates and the sensitivity figures of merit of the five surface event rejection methods developed in the second CDMS II Soudan run data analysis.

Published
2007
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2. Study of the dead layer in germanium for the CDMS detectors

Author

Jeffrey P. Filippini, M. J. Attisha, P. L. Brink, R. W. Schnee, Laura Baudis, N. Mirabolfathi, W. Rau, Bruno Serfass, J. P. F. Thompson, P. Meunier, R. J. Gaitskell, R. W. Ogburn, Vuk Mandic, and C. L. Chang

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Bolometer, chemistry.chemical_element, Germanium, Electron, Particle detector, Semiconductor detector, law.invention, Nuclear physics, chemistry, law, Ionization, Neutron, Cryogenic Dark Matter Search, Instrumentation
Abstract

We present new measurements on a Cryogenic Dark Matter Search (CDMS) detector with electron, neutron, and gamma sources. The measurements have been performed to investigate the dead layer of one of the CDMS Z-dependent Ionization Phonon germanium detectors. The dead layer has been studied at both charge electrodes and at different electric field intensities. We also present a method to remove the dependence of athermal phonon measurements on event position.

Published
2004
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3. Installation and commissioning of the CDMSII experiment at Soudan

Author

R. Mahapatra, Tarek Saab, M. J. Attisha, M. B. Crisler, H. N. Nelson, R. Ferril, John M. Martinis, Donald J. Holmgren, R. H. Nelson, M. C. Perillo Isaac, Astrid Tomada, G. Smith, R. Bunker, J. Alvaro-Dean, A. Lu, Alexander Bolozdynya, M. Haldeman, L. Duong, Martin E. Huber, J. P. F. Thompson, A. L. Spadafora, P. Meunier, J. Hellmig, Thushara Perera, D. O. Caldwell, R. L. Dixon, G. Wang, D. N. Seitz, S. Kamat, J. P. Castle, R. J. Gaitskell, M. S. Armel, S. J. Yellin, J. Sander, Bernard Sadoulet, R. W. Ogburn, Betty A. Young, T. A. Shutt, J. Emes, J. Perales, D. A. Bauer, R. W. Schnee, Ronald R. Ross, C. Savage, Laura Baudis, C. L. Chang, M. Kurylowicz, M. Hennessey, Vuk Mandic, D. D. Driscoll, Sunil Golwala, A. K. Davies, P. Cushman, A. Reisetter, W. Rau, D. S. Akerib, Blas Cabrera, Sae Woo Nam, R. M. Clarke, P. L. Brink, and N. Mirabolfathi

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Nuclear engineering, Detector, Dark matter, Nuclear physics, Data acquisition, Installation, Weakly interacting massive particles, Electromagnetic shielding, High Energy Physics::Experiment, Electronics, Cryogenic Dark Matter Search, Instrumentation
Abstract

In the past year and a half, the Cryogenic Dark Matter Search (CDMS) collaboration has been active at the Soudan mine in installing a system for running ZIP detectors that will be used to search for dark matter in the form of Weakly Interacting Massive Particles. Presently, there is an operating cryogenic system, working electronics, a functional data acquisition and analysis system, passive shielding, an active muon veto, and 12 ZIP detectors. Six of the 12 ZIP detectors have been tested in situ and are fully operational with acceptable noise profiles. CDMS is in the process of commissioning the experiment and expects to be making a background measurement by the end of summer 2003.

Published
2004
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4. Characterization, performance, and future advanced analysis of detectors in the cryogenic dark matter search (CDMS-II)

Author

Thushara Perera, S. J. Yellin, J. Sander, C. N. Bailey, Chihway Chang, R. H. Nelson, Sunil Golwala, M. J. Attisha, Tarek Saab, P. Meunier, S. Leclercq, M. R. Dragowsky, J. P. F. Thompson, N. Mirabolfathi, E. J. Ramberg, R. Ferril, S. Kamat, D. O. Caldwell, Betty A. Young, R. J. Gaitskell, D. S. Akerib, K. M. Sundqvist, Donald J. Holmgren, R. W. Ogburn, Jeffrey P. Filippini, P. L. Brink, H. N. Nelson, M. B. Crisler, J. Yoo, Ronald R. Ross, R. Hennings-Yeomans, M. Pyle, Darren Grant, Vuk Mandic, L. Duong, Miguel Daal, Martin E. Huber, P. P. Brusov, D. N. Seitz, D. A. Bauer, R. Mahapatra, A. Reisetter, A. Lu, Bernard Sadoulet, G. Wang, C. Savage, Laura Baudis, R. Bunker, R. L. Dixon, Blas Cabrera, Jodi Cooley, R. W. Schnee, D. D. Driscoll, P. Cushman, and Bruno Serfass

Subjects
Physics, Data set, Nuclear and High Energy Physics, Particle physics, Cold dark matter, Detector, Cryogenic Dark Matter Search, Current (fluid), Instrumentation, Characterization (materials science)
Abstract

We present the techniques and results of the calibrations and surface-event rejection cut for the current CDMS-II data set, along with proposals for future analysis of CDMS-II data.

Published
2006
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5. Limits on WIMP–nucleon interactions from the Cryogenic Dark Matter Search at the Soudan Underground Laboratory

Author

P. Meunier, R. W. Ogburn, S. Leclercq, M. R. Dragowsky, C. L. Chang, N. Mirabolfathi, M. B. Crisler, D. O. Caldwell, A. Reisetter, C. N. Bailey, M. Pyle, Jeffrey P. Filippini, R. Hennings-Yeomans, E. J. Ramberg, Darren Grant, D. N. Seitz, R. H. Nelson, Miguel Daal, R. Bunker, J. P. F. Thompson, H. N. Nelson, R. L. Dixon, L. Duong, R. J. Gaitskell, S. Kamat, Martin E. Huber, A. Lu, J. Sander, Thushara Perera, Donald J. Holmgren, S. J. Yellin, Betty A. Young, R. W. Schnee, Ronald R. Ross, D. D. Driscoll, G. Wang, K. M. Sundqvist, P. Cushman, Bernard Sadoulet, R. Mahapatra, R. Ferril, M. J. Attisha, C. Savage, Laura Baudis, P. L. Brink, Bruno Serfass, D. A. Bauer, Vuk Mandic, P. P. Brusov, Sunil Golwala, D. S. Akerib, Jodi Cooley, J. Yoo, and Blas Cabrera

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Underground Xenon experiment, Physics::Instrumentation and Detectors, Axion Dark Matter Experiment, Dark matter, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, WIMP, Weakly interacting massive particles, Warm dark matter, High Energy Physics::Experiment, Cryogenic Dark Matter Search, Instrumentation, Light dark matter
Abstract

We present the results of the first two data runs of the Cryogenic Dark Matter Search at Soudan Underground Laboratory. These data exclude substantial new parameter space for both spin-independent and spin-dependent WIMP–nucleon interactions within the standard halo model.

Published
2006
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6. The SuperCDMS proposal for dark matter detection

Author

Betty A. Young, Jeffrey P. Filippini, K. M. Sundqvist, R. Bunker, L. Duong, Blas Cabrera, P. P. Brusov, Martin E. Huber, E. J. Ramberg, R. W. Schnee, A. Reisetter, M. R. Dragowsky, J. Yoo, Bernard Sadoulet, M. J. Attisha, J. P. F. Thompson, J. Sander, D. O. Caldwell, P. Cushman, C. N. Bailey, R. Hennings-Yeomans, Darren Grant, D. A. Bauer, P. L. Brink, Jodi Cooley, Peter Denes, R. J. Gaitskell, Laura Baudis, R. Mahapatra, Sunil Golwala, D. S. Akerib, Kent D. Irwin, Donald J. Holmgren, A. Lu, P. Meunier, R. W. Ogburn, H. N. Nelson, D. N. Seitz, N. Mirabolfathi, C. L. Chang, S. J. Yellin, M. B. Crisler, Tarek Saab, and Bruno Serfass

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Cold dark matter, Large Underground Xenon experiment, WIMP, Weakly interacting massive particles, Dark matter, Warm dark matter, Cryogenic Dark Matter Search, Instrumentation, Light dark matter
Abstract

Presently the CDMS-II collaboration's Weakly Interacting Massive Particle (WIMP) search at the Soudan Underground Laboratory sets the most stringent exclusion limits of any WIMP cold dark matter direct-detection experiment. To extend our reach further, to WIMP-nucleon cross-sections in the range 10 - 46 - 10 - 44 cm 2 , we propose SuperCDMS, which would take advantage of a very deep site. One promising site is the recently approved SNOLab facility in Canada. In this paper we will present our overall program and focus on phase A of SuperCDMS.

Published
2006
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7. Further results from the CDMS experiment

Author

D. D. Driscoll, P. Cushman, M. C. Perillo Isaac, P. Meunier, N. Mirabolfathi, R. W. Ogburn, L. Duong, C. Savage, Laura Baudis, C. L. Chang, Martin E. Huber, M. B. Crisler, Bernard Sadoulet, J. P. F. Thompson, R. R. Ross, A. Lu, Vuk Mandic, R. J. Gaitskell, M. S. Armel, S. Kamat, M. J. Attisha, R. Bunker, G. Wang, R. L. Dixon, H. N. Nelson, Blas Cabrera, R. W. Schnee, R. Mahapatra, D. O. Caldwell, John M. Martinis, D. S. Akerib, D. A. Bauer, Betty A. Young, P. L. Brink, A. Reisetter, W. Rau, J. Sander, Tarek Saab, and S. J. Yellin

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Cold dark matter, Physics::Instrumentation and Detectors, Astrophysics::Instrumentation and Methods for Astrophysics, Fermion, Particle detector, Nuclear physics, WIMP, Ionization, Weakly interacting massive particles, High Energy Physics::Experiment, Neutron, Cryogenic Dark Matter Search, Instrumentation
Abstract

The Cryogenic Dark Matter Search experiment utilizes discriminating detectors where both the recoil energy and ionization produced by each particle event are simultaneously measured. Here we present our latest results from operating 4 Ge (4×250 g) and 2 Si (2×100 g) detectors at the shallow Stanford site. Our new WIMP exclusion limit excludes new parameter space for low-mass WIMPS.

Published
2004
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8. First CDMS II WIMP Search Results from the Soudan Underground Laboratory

Author

R. W. Ogburn, R. Bunker, A. Reisetter, Betty A. Young, W. Rau, K. M. Sundqvist, H. Nelson, G. Wang, P. L. Brink, M. J. Attisha, V. Mandic, R. Mahapatra, D. A. Bauer, N. Mirabolfathi, P. Meunier, B. Serfass, David O. Caldwell, A. J. Sirois, D. N. Seitz, Donald J. Holmgren, A. Lu, M. R. Dragowsky, J. Sander, J. P. F. Thompson, M. S. Armel-Funkhouser, R. R. Ross, C. Savage, Blas Cabrera, S. Kamat, R. Ferril, R. J. Gaitskell, E. J. Ramberg, M. B. Crisler, Bernard Sadoulet, C. L. Chang, R. Nelson, Tarek Saab, Thushara Perera, S. J. Yellin, D. S. Akerib, Jeffrey P. Filippini, L. Duong, M. E. Huber, Laura Baudis, D. D. Driscoll, P. Cushman, R. L. Dixon, and R. W. Schnee

Subjects
Physics, Particle physics, WIMP, Dark matter, Underground laboratory, Cryogenic Dark Matter Search
Abstract

D.S. Akerib, M.S. Armel-Funkhouser, M.J. Attisha, L. Baudis, D.A. Bauer, P.L. Brink, R. Bunker, B. Cabrera, D.O. Caldwell, C.L. Chang, M.B. Crisler, P. Cushman, R. Dixon, M.R. Dragowsky, D.D. Driscoll, L. Duong, R. Ferril, J. Filippini, R.J. Gaitskell, D. Holmgren, M.E. Huber, S. Kamat, A. Lu, R. Mahapatra, V. Mandic, P. Meunier, N. Mirabolfathi, H. Nelson, R. Nelson, R.W. Ogburn, T.A. Perera, E. Ramberg, W. Rau, A. Reisetter, R.R. Ross, T. Saab, B. Sadoulet, J. Sander, C. Savage, R.W. Schnee, D.N. Seitz, B. Serfass, A.J. Sirois, K.M. Sundqvist, J-P.F. Thompson, G. Wang, S. Yellin, and B.A. Young

Published
2006
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9. The SuperCDMS Experiment

Author

K. M. Sundqvist, D. N. Seitz, Sunil Golwala, Jeffrey P. Filippini, C. N. Bailey, J. P. F. Thompson, R. W. Ogburn, P. Cushman, D. S. Akerib, P. L. Brink, C.L. Chang, L. Duong, Jodi Cooley, Martin E. Huber, David O. Caldwell, J. Yoo, Peter Denes, R. J. Gaitskell, B. Serfass, M. J. Attisha, Bernard Sadoulet, R. Mahapatra, Blas Cabrera, Kent D. Irwin, Laura Baudis, P. Meunier, D. A. Bauer, Darren Grant, N. Mirabolfathi, S. J. Yellin, E. J. Ramberg, M. Crisler, Tarek Saab, R. Hennings-Yeomans, Donald J. Holmgren, A. Lu, R. Bunker, A. Reisetter, R. W. Schnee, M. R. Dragowsky, P. P. Brusov, Betty A. Young, H. Nelson, and J. Sander

Subjects
Physics, Theoretical physics, Particle physics, Detector, Production (economics)
Abstract

Modest improvements in the level and/or discrimination of backgrounds are needed to keep backgrounds negligible during the three phases of SuperCDMS. By developing production designs that require only modest testing, detector production rates may be improved sufficiently to allow an exposure of 500 ton d within a reasonable time and budget. Overall, the improvement estimates described above are conservative. Previous development efforts have shown that some areas prove easier and provide larger factors while others prove more difficult. The conservative estimates together with the broad approach reduce the risk and give us confidence that we will succeed, providing the surest way to probe to WIMP-nucleon cross sections of 10{sup -46} cm{sup 2}.

Published
2006
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10. Limits on Spin-Independent Interactions of Weakly Interacting Massive Particles with Nucleons from the Two-Tower Run of the Cryogenic Dark Matter Search

Author

N. Mirabolfathi, M. J. Attisha, Thushara Perera, S. J. Yellin, C. Savage, Laura Baudis, R. Ferril, Jodi Cooley, A. Reisetter, Sunil Golwala, Vuk Mandic, Ronald R. Ross, W. Rau, R. Bunker, R. Mahapatra, R. L. Dixon, Jeffrey P. Filippini, D. S. Akerib, Chihway Chang, H. N. Nelson, J. Yoo, S. Leclercq, R. W. Schnee, M. R. Dragowsky, L. Duong, Martin E. Huber, Bernard Sadoulet, D. O. Caldwell, R. H. Nelson, P. Meunier, D. D. Driscoll, G. Wang, Miguel Daal, Bruno Serfass, Blas Cabrera, R. W. Ogburn, P. Cushman, A. Lu, J. P. F. Thompson, S. Kamat, R. Hennings-Yeomans, R. J. Gaitskell, Darren Grant, Betty A. Young, D. A. Bauer, K. M. Sundqvist, Donald J. Holmgren, C. N. Bailey, M. B. Crisler, M. Pyle, J. Sander, D. N. Seitz, P. L. Brink, P. P. Brusov, and E. J. Ramberg

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Dark matter, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Tower (mathematics), Nuclear physics, Recoil, WIMP, Weakly interacting massive particles, 0103 physical sciences, Cryogenic Dark Matter Search, 010306 general physics, Nucleon, Spin-½
Abstract

We report new results from the Cryogenic Dark Matter Search (CDMS II) at the Soudan Underground Laboratory. Two towers, each consisting of six detectors, were operated for 74.5 live days, giving spectrum-weighted exposures of 34 kg-d for germanium and 12 kg-d for silicon targets after cuts, averaged over recoil energies 10-100 keV for a WIMP mass of 60GeV/c{sup 2}. A blind analysis was conducted, incorporating improved techniques for rejecting surface events. No WIMP signal exceeding expected backgrounds was observed. When combined with our previous results from Soudan, the 90% C.L. upper limit on the spin-independent WIMP-nucleon cross section is 1.6 x 10{sup -43} cm{sup 2} from Ge, and 3 x 10{sup -42} cm{sup 2} from Si, for a WIMP mass of 60GeV/c{sup 2}. The combined limit from Ge (Si) is a factor of 2.5 (10) lower than our previous results, and constrains predictions of supersymmetric models.

Published
2006

11. Latest Results From The CDMS-II Cold Dark Matter Search

Author

P. L. Brink, David O. Caldwell, D. A. Bauer, C. L. Chang, R. Mahapatra, M. J. Attisha, E. J. Ramberg, C. N. Bailey, Tarek Saab, R. Bunker, Ronald R. Ross, R. L. Dixon, R. Ferril, Bruno Serfass, S. Kamat, Miguel Daal, Blas Cabrera, M. B. Crisler, Jeffrey P. Filippini, R. W. Schnee, John M. Martinis, N. Mirabolfathi, G. Wang, C. Savage, Laura Baudis, Betty A. Young, K. M. Sundqvist, L. Duong, Martin E. Huber, Donald J. Holmgren, M. R. Dragowsky, A. Lu, D. D. Driscoll, M. S. Armel-Funkhouser, H. N. Nelson, D. S. Akerib, P. Cushman, R. Hennings-Yeomans, Thushara Perera, D. N. Seitz, S. J. Yellin, J. Sander, J. P. F. Thompson, Bernard Sadoulet, R. J. Gaitskell, R. H. Nelson, Vuk Mandic, P. Meunier, R. W. Ogburn, and A. Reisetter

Subjects
Nuclear physics, Physics, Particle physics, Cold dark matter, Weakly interacting massive particles, Dark matter, Cryogenic Dark Matter Search, Event (particle physics), Particle identification, Particle detector, Semiconductor detector
Abstract

The CDMS‐II collaboration’s Cold Dark Matter search presently sets the most competitive exclusion limit in the world for the direct detection of the hypothesized Weakly Interacting Massive Particles (WIMPs) that constitute the cold dark matter of the Universe. Our experiment utilizes Ge (and Si) crystals as the target detectors, each with a mass of 250 g (100 g) and cooled to 30 mK. To eliminate natural radioactive sources as background the experiment is conducted in a well‐shielded environment in the Soudan Mine, Minnesota, and has been operating for the last two years. To aid in the identification of a possible WIMP‐candidate event, the detectors are designed to measure both the ionization and athermal phonon signals produced by each candidate event. The athermal phonon signal is measured using superconducting aluminum films on the crystal surface connected to tungsten transition edge sensors. The latest WIMP‐search results from Soudan will be presented, along with projections for the future.

Published
2006
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12. Limits on spin-dependent WIMP-nucleon interactions from the Cryogenic Dark Matter Search

Author

Blas Cabrera, H. N. Nelson, E. J. Ramberg, Bernard Sadoulet, F. DeJongh, M. J. Attisha, Vuk Mandic, Jeffrey P. Filippini, R. H. Nelson, Miguel Daal, D. N. Seitz, J. Sander, S. Leclercq, M. R. Dragowsky, A. Lu, Betty A. Young, Ronald R. Ross, L. Duong, Martin E. Huber, S. Kamat, J. P. F. Thompson, Tarek Saab, P. P. Brusov, P. L. Brink, P. Meunier, K. M. Sundqvist, D. O. Caldwell, R. Mahapatra, N. Mirabolfathi, G. Wang, D. A. Bauer, M. S. Armel-Funkhouser, R. J. Gaitskell, Jodi Cooley, R. Hennings-Yeomans, R. Ferril, Darren Grant, R. W. Ogburn, J. Yoo, Chihway Chang, Donald J. Holmgren, R. Bunker, Thushara Perera, S. J. Yellin, Bruno Serfass, A. Reisetter, C. N. Bailey, W. Rau, R. L. Dixon, R. W. Schnee, C. Savage, Laura Baudis, Sunil Golwala, D. D. Driscoll, P. Cushman, M. B. Crisler, M. Pyle, and D. S. Akerib

Subjects
Nuclear and High Energy Physics, Particle physics, Large Underground Xenon experiment, Physics::Instrumentation and Detectors, media_common.quotation_subject, Dark matter, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), WIMP, 0103 physical sciences, Warm dark matter, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Light dark matter, media_common, Physics, 010308 nuclear & particles physics, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, Universe, Weakly interacting massive particles, High Energy Physics::Experiment, Cryogenic Dark Matter Search
Abstract

The Cryogenic Dark Matter Search (CDMS) is an experiment to detect weakly interacting massive particles (WIMPs) based on their interactions with Ge and Si nuclei. We report the results of an analysis of data from the first two runs of CDMS at the Soudan Underground Laboratory in terms of spin-dependent WIMP-nucleon interactions on 73Ge and 29Si. These data exclude new regions of spin-dependent WIMP-nucleon interaction parameter space, including regions relevant to spin-dependent interpretations of the annual modulation signal reported by the DAMA/NaI experiment., Comment: 5 pages, 4 figures; replacement to match published version

Published
2006

13. Exclusion limits on the WIMP-nucleon cross section from the first run of the Cryogenic Dark Matter Search in the Soudan Underground Laboratory

Author

Ronald R. Ross, P. Meunier, Vuk Mandic, Bernard Sadoulet, B. Serfass, R. W. Ogburn, Blas Cabrera, D. D. Driscoll, M. S. Armel-Funkhouser, D. A. Bauer, Tarek Saab, P. Cushman, J. P. F. Thompson, K. M. Sundqvist, R. Hennings-Yeomans, M. Daal, R. Bunker, A. Reisetter, Betty A. Young, M. R. Dragowsky, M. C. Perillo Issac, W. Rau, R. Ferril, R. J. Gaitskell, H. N. Nelson, D. O. Caldwell, R. L. Dixon, A. Lu, D. S. Akerib, N. Mirabolfathi, R. W. Schnee, S. Kamat, C. L. Chang, R. H. Nelson, C. Savage, Laura Baudis, G. Wang, Thushara Perera, S. J. Yellin, M. J. Attisha, M. B. Crisler, J. Sander, Jeffrey P. Filippini, L. Duong, Martin E. Huber, E. J. Ramberg, Donald J. Holmgren, P. L. Brink, D. N. Seitz, R. Mahapatra, C. N. Bailey, and John M. Martinis

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics (astro-ph), Dark matter, FOS: Physical sciences, Astrophysics, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Dark matter halo, High Energy Physics - Experiment (hep-ex), Recoil, WIMP, Weakly interacting massive particles, 0103 physical sciences, Neutron, Cryogenic Dark Matter Search, 010306 general physics
Abstract

The Cryogenic Dark Matter Search (CDMS-II) employs low-temperature Ge and Si detectors to seek Weakly Interacting Massive Particles (WIMPs) via their elastic scattering interactions with nuclei. Simultaneous measurements of both ionization and phonon energy provide discrimination against interactions of background particles. For recoil energies above 10 keV, events due to background photons are rejected with >99.99% efficiency. Electromagnetic events very near the detector surface can mimic nuclear recoils because of reduced charge collection, but these surface events are rejected with >96% efficiency by using additional information from the phonon pulse shape. Efficient use of active and passive shielding, combined with the the 2090 m.w.e. overburden at the experimental site in the Soudan mine, makes the background from neutrons negligible for this first exposure. All cuts are determined in a blind manner from in situ calibrations with external radioactive sources without any prior knowledge of the event distribution in the signal region. Resulting efficiencies are known to ~10%. A single event with a recoil of 64 keV passes all of the cuts and is consistent with the expected misidentification rate of surface-electron recoils. Under the assumptions for a standard dark matter halo, these data exclude previously unexplored parameter space for both spin-independent and spin-dependent WIMP-nucleon elastic scattering. The resulting limit on the spin-independent WIMP-nucleon elastic-scattering cross-section has a minimum of 4x10^-43 cm^2 at a WIMP mass of 60 GeV/c^2. The minimum of the limit for the spin-dependent WIMP-neutron elastic-scattering cross-section is 2x10^-37 cm^2 at a WIMP mass of 50 GeV/c^2., 37 pages, 42 figures

Published
2005
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14. First Results from the Cryogenic Dark Matter Search in the Soudan Underground Lab

Author

J. Emes, D. S. Akerib, Daniel E. Hale, Ronald R. Ross, K. M. Sundqvist, R. L. Dixon, S. Burke, J. P. Castle, R. W. Schnee, D. N. Seitz, D. D. Driscoll, R. Mahapatra, B. Johnson, M. Kozlovsky, P. Cushman, Scott P. Orr, C. Savage, Laura Baudis, Betty A. Young, Astrid Tomada, E. J. Ramberg, A. G. Manalaysay, D. Callahan, Bernard Sadoulet, Jasmine L. May, M. J. Attisha, J. P. F. Thompson, L. Novak, R. McDonald, J. Beaty, R. J. Gaitskell, Wendy Johnson, Donald J. Holmgren, P. L. Brink, B. Serfass, M. C. Perillo Isaac, David O. Caldwell, B. Merkel, G. Wang, B. Lambin, M. R. Dragowsky, A. Lu, G. Smith, Alan R. Smith, R. H. Nelson, M. S. Armel-Funkhouser, S. Morrison, J. Williams, Jeffrey P. Filippini, S. Kyre, L. Duong, Martin E. Huber, Vuk Mandic, M. Crisler, M. Haldeman, D. A. Bauer, J. Sander, Blas Cabrera, J. Alvaro-Dean, N. Mirabolfathi, R. Choate, P. Meunier, R. W. Ogburn, C. L. Chang, H. N. Nelson, L. Kula, A. L. Spadafora, R. Bunker, A. Reisetter, R. Schmitt, W. Rau, Tarek Saab, S. Kamat, R. Ferril, Thushara Perera, and S. J. Yellin

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Dark matter, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, General Physics and Astronomy, FOS: Physical sciences, Elementary particle, Supersymmetry, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 7. Clean energy, 01 natural sciences, Nuclear physics, Baryon, WIMP, Weakly interacting massive particles, 0103 physical sciences, Neutralino, High Energy Physics::Experiment, Cryogenic Dark Matter Search, 010306 general physics, Nuclear Experiment
Abstract

We report the first results from a search for weakly interacting massive particles (WIMPs) in the Cryogenic Dark Matter Search (CDMS) experiment at the Soudan Underground Laboratory. Four Ge and two Si detectors were operated for 52.6 live days, providing 19.4 kg-d of Ge net exposure after cuts for recoil energies between 10--100 keV. A blind analysis was performed using only calibration data to define the energy threshold and selection criteria for nuclear-recoil candidates. Using the standard dark-matter halo and nuclear-physics WIMP model, these data set the world's lowest exclusion limits on the coherent WIMP-nucleon scalar cross-section for all WIMP masses above 15 GeV, ruling out a significant range of neutralino supersymmetric models. The minimum of this limit curve at the 90% C.L. is 4 x 10^{-43} cm^2 at a WIMP mass of 60 GeV., Comment: 4 pages, 5 figures, submitted to Phys. Rev. Lett; minor clarifications in response to referee's comments

Published
2004
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15. New results from the Cryogenic Dark Matter Search experiment

Author

D. A. Bauer, M. Perillo-Isaac, J. Perales, Ronald R. Ross, M. Kurylowicz, J. P. Castle, D. D. Driscoll, A. K. Davies, M. Hennessey, Vuk Mandic, M. B. Crisler, J. Alvaro-Dean, Tarek Saab, P. Cushman, N. Mirabolfathi, L. Duong, Sunil Golwala, Betty A. Young, Martin E. Huber, G. Smith, Astrid Tomada, J. Emes, S. Kamat, R. H. Nelson, D. S. Akerib, M. J. Attisha, R. Ferril, H. N. Nelson, R. L. Dixon, T. A. Shutt, G. Wang, R. W. Schnee, C. Savage, C. L. Chang, Blas Cabrera, Laura Baudis, R. Mahapatra, D. N. Seitz, A. Lu, R. M. Clarke, A. L. Spadafora, Alexander Bolozdynya, Thushara Perera, M. Haldeman, J. P. F. Thompson, S. J. Yellin, R. J. Gaitskell, J. Sander, Donald J. Holmgren, P. Meunier, R. W. Ogburn, R. Bunker, A. Reisetter, W. Rau, P. L. Brink, Bernard Sadoulet, J. Hellmig, Sae Woo Nam, David O. Caldwell, Armel, and John M. Martinis

Subjects
Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Hadron, FOS: Physical sciences, Elementary particle, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), WIMP, 0103 physical sciences, Neutron, 010306 general physics, Light dark matter, Physics, 010308 nuclear & particles physics, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, Baryon, Weakly interacting massive particles, High Energy Physics::Experiment, Cryogenic Dark Matter Search
Abstract

Using improved Ge and Si detectors, better neutron shielding, and increased counting time, the Cryogenic Dark Matter Search (CDMS) experiment has obtained stricter limits on the cross section of weakly interacting massive particles (WIMPs) elastically scattering from nuclei. Increased discrimination against electromagnetic backgrounds and reduction of neutron flux confirm WIMP-candidate events previously detected by CDMS were consistent with neutrons and give limits on spin-independent WIMP interactions which are >2X lower than previous CDMS results for high WIMP mass, and which exclude new parameter space for WIMPs with mass between 8-20 GeV/c^2., 4 pages, 4 figures

Published
2003
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