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1. Constraints on low-mass, relic dark matter candidates from a surface-operated SuperCDMS single-charge sensitive detector

Author

K. Fouts, W. Rau, D. A. Bauer, S. S. Poudel, N. Chott, M. L. di Vacri, Ruth Lawrence, Fernando Ponce, H. E. Rogers, S. Scorza, Xingbo Zhao, R. Germond, John Wilson, Bruno Serfass, M. H. Kelsey, A. N. Villano, S. M. Oser, C. Stanford, E. Lopez Asamar, A. Sattari, Matthew Fritts, A. J. Mayer, Vuk Mandic, I. J. Arnquist, B. A. Hines, N. Herbert, M. Michaud, H. R. Harris, Tarek Saab, N. Mast, P. Cushman, D. Barker, H. G. Zhang, L. Zheng, E. Zhang, Douglas Wright, Sunil Golwala, Seema Verma, M. Stein, T. Reynolds, To Chin Yu, Betty A. Young, R. A. Cameron, John L. Orrell, D. MacDonell, L. Hsu, Yu Kai Chang, S. L. Watkins, Martin E. Huber, D. Toback, Jodi Cooley, C. Cartaro, P. Pakarha, N. Mirabolfathi, Bedangadas Mohanty, Amy Roberts, A. Li, J. D. Morales Mendoza, M. A. Bowles, R. Chen, D. Jardin, D. W. P. Amaral, B. von Krosigk, A. Jastram, C. W. Fink, Matt Pyle, S. Nagorny, E. Fascione, R. Underwood, H. Coombes, T. Aralis, R. W. Schnee, D. B. MacFarlane, E. Azadbakht, T. Binder, David G. Cerdeño, Ben Loer, Blas Cabrera, R. Mahapatra, R. Calkins, J. Corbett, R. Bhattacharyya, Noah Kurinsky, E. Michielin, J. Winchell, J. K. Nelson, L. Wills, S. J. Yellin, Tsuguo Aramaki, L. V. S. Bezerra, W. A. Page, M. I. Hollister, J. Sander, D. J. Sincavage, M. Ghaith, F. De Brienne, G. Gerbier, R. Bunker, J. Street, E. Reid, Enectali Figueroa-Feliciano, R. Ren, A. Kubik, P. L. Brink, Bernard Sadoulet, A. E. Robinson, V. Iyer, R. Podviianiuk, R. Partridge, P. Lukens, M. Diamond, Ziqing Hong, M. J. Wilson, V. Novati, S. Banik, Eric W. Hoppe, H. Neog, and C. Bathurst

Subjects
Coupling constant, Physics, Physics - Instrumentation and Detectors, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, Dark matter, FOS: Physical sciences, Charge (physics), Instrumentation and Detectors (physics.ins-det), Electron, Kinetic energy, 01 natural sciences, Dark photon, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Absorption (logic), Atomic physics, 010306 general physics, Light dark matter, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

This article presents an analysis and the resulting limits on light dark matter inelastically scattering off of electrons, and on dark photon and axion-like particle absorption, using a second-generation SuperCDMS high-voltage eV-resolution detector. The 0.93 gram Si detector achieved a 3 eV phonon energy resolution; for a detector bias of 100 V, this corresponds to a charge resolution of 3% of a single electron-hole pair. The energy spectrum is reported from a blind analysis with 1.2 gram-days of exposure acquired in an above-ground laboratory. With charge carrier trapping and impact ionization effects incorporated into the dark matter signal models, the dark matter-electron cross section $\bar{\sigma}_{e}$ is constrained for dark matter masses from 0.5--$10^{4} $MeV$/c^{2}$; in the mass range from 1.2--50 eV$/c^{2}$ the dark photon kinetic mixing parameter $\varepsilon$ and the axioelectric coupling constant $g_{ae}$ are constrained. The minimum 90% confidence-level upper limits within the above mentioned mass ranges are $\bar{\sigma}_{e}\,=\,8.7\times10^{-34}$ cm$^{2}$, $\varepsilon\,=\,3.3\times10^{-14}$, and $g_{ae}\,=\,1.0\times10^{-9}$., Comment: 5 pages + title and references, 3 figures and 1 table

Published
2020

2. Constraints on dark photons and axionlike particles from the SuperCDMS Soudan experiment

Author

É. M. Michaud, R. Mahapatra, C. W. Fink, R. Underwood, R. A. Cameron, N. Herbert, John L. Orrell, N. Mirabolfathi, D. MacDonell, Ben Loer, D. A. Bauer, S. S. Poudel, C. Cartaro, W. Baker, H. R. Harris, Fernando Ponce, Bedangadas Mohanty, A. Li, Yu Kai Chang, Betty A. Young, Amy Roberts, A. Jastram, C. Stanford, D. J. Sincavage, D. Jardin, A. N. Villano, P. Lukens, M. Diamond, Matthew Fritts, Vuk Mandic, S. M. Oser, K. Fouts, L. Zheng, J. Street, M. Stein, M. I. Hollister, John Wilson, M. E. Huber, E. Azadbakht, A. Kennedy, Ziqing Hong, Xingbo Zhao, T. Reynolds, H. Coombes, F. De Brienne, G. Gerbier, D. B. MacFarlane, Emily Z. Zhang, H. E. Rogers, J. D. Morales Mendoza, L. V. S. Bezerra, Emanuele Michielin, Blas Cabrera, M. J. Wilson, Ruth Lawrence, P. Cushman, T. Binder, Bruno Serfass, S. Banik, Eric W. Hoppe, S. J. Yellin, Tsuguo Aramaki, D. H. Wright, J. Corbett, Noah Kurinsky, H. Neog, C. Bathurst, M. A. Bowles, R. Germond, W. A. Page, Matt Pyle, W. Rau, V. Iyer, R. Podviianiuk, Kartik Senapati, M. Ghaith, Sunil Golwala, S. Nagorny, B. Cornell, E. Fascione, R. Bunker, J. K. Nelson, A. Kubik, M. L. di Vacri, A. E. Robinson, I. J. Arnquist, R. W. Schnee, L. Hsu, S. Scorza, R. Partridge, Tarek Saab, N. Mast, L. Wills, R. Bhattacharyya, D. Toback, B. von Krosigk, J. Sander, Jodi Cooley, M. H. Kelsey, David G. Cerdeño, S. L. Watkins, P. Pakarha, R. Calkins, Enectali Figueroa-Feliciano, R. Ren, D. Barker, J. Winchell, T. Aralis, Bernard Sadoulet, To Chin Yu, E. Lopez Asamar, Seema Verma, Bruce A. Hines, and P. L. Brink

Subjects
Physics, Range (particle radiation), Photon, 010308 nuclear & particles physics, Dark matter, chemistry.chemical_element, Germanium, Electron, Parameter space, Kinetic energy, 01 natural sciences, Nuclear physics, chemistry, 0103 physical sciences, Particle, 010306 general physics
Abstract

We present an analysis of electron recoils in cryogenic germanium detectors operated during the SuperCDMS Soudan experiment. The data are used to set new constraints on the axioelectric coupling of axionlike particles and the kinetic mixing parameter of dark photons, assuming the respective species constitutes all of the galactic dark matter. This study covers the mass range from 40 eV/c2 to 500 keV/c2 for both candidates, excluding previously untested parameter space for masses below ∼1 keV/c2. For the kinetic mixing of dark photons, values below 10−15 are reached for particle masses around 100 eV/c2; for the axioelectric coupling of axionlike particles, values below 10−12 are reached for particles with masses in the range of a few-hundred eV/c2.

Published
2020

3. Evaluation and mitigation of trace $^{210}$Pb contamination on copper surfaces

Author

I. J. Arnquist, John L. Orrell, R. Calkins, Eric W. Hoppe, Tsuguo Aramaki, Raymond Bunker, Jodi Cooley, and Kimbrelle S. Thommasson

Subjects
Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Spectrometer, 010308 nuclear & particles physics, Metallurgy, FOS: Physical sciences, chemistry.chemical_element, Instrumentation and Detectors (physics.ins-det), Contamination, 01 natural sciences, Copper, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), chemistry, 13. Climate action, Etching (microfabrication), Impurity, 0103 physical sciences, Emissivity, Electroplating, 010303 astronomy & astrophysics, Instrumentation, Polonium
Abstract

Clean materials are required to construct and operate many low-background physics experiments. High-purity copper has found broad use because of its physical properties and availability. In this paper, we describe methods to assay and mitigate $^{210}$Pb contamination on copper surfaces, such as from exposure to environmental radon or coming from bulk impurities. We evaluated the efficacy of wet etching on commercial samples and observed that $^{210}$Po contamination from the copper bulk does not readily pass into solution. During the etch, the polonium appears to trap at the copper-etchant boundary, such that it is effectively concentrated at the copper surface. We observed a different behavior for $^{210}$Pb; high-sensitivity measurements of the alpha emissivity versus time indicate the lowest level of $^{210}$Pb contamination ever reported for a commercial copper surface: $0\pm12$ nBq/cm$^2$ (1$\sigma$). Additionally, we have demonstrated the effectiveness of mitigating trace $^{210}$Pb and $^{210}$Po surface backgrounds using custom, high-purity electroplating techniques. These approaches were evaluated utilizing assays performed with an XIA UltraLo-1800 alpha spectrometer., Comment: Published in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Volume 967, 1 July 2020, 163870

Published
2020

4. Light Dark Matter Search with a High-Resolution Athermal Phonon Detector Operated Above Ground

Author

E. Azadbakht, C. W. Fink, C. Cartaro, R. Mahapatra, M. A. Bowles, S. Banik, Eric W. Hoppe, H. Neog, R. A. Cameron, John L. Orrell, C. Bathurst, R. Calkins, D. A. Bauer, S. S. Poudel, D. MacDonell, V. Novati, M. H. Kelsey, M. Diamond, P. Cushman, P. Lukens, Yu Kai Chang, P. Pakarha, J. K. Nelson, Tarek Saab, N. Mast, L. Wills, J. Winchell, R. Partridge, L. V. S. Bezerra, Fernando Ponce, Ziqing Hong, H. G. Zhang, N. Herbert, H. R. Harris, P. L. Brink, D. W. P. Amaral, L. Zheng, M. J. Wilson, D. J. Sincavage, W. A. Page, Bernard Sadoulet, M. Chaudhuri, Blas Cabrera, J. Street, Martin E. Huber, A. E. Robinson, E. Lopez Asamar, N. Mirabolfathi, É. M. Michaud, Bedangadas Mohanty, A. J. Mayer, A. Li, H. Coombes, Noah Kurinsky, I. J. Arnquist, L. Hsu, J. Sander, T. C. Yu, Sunil Golwala, K. Fouts, A. Jastram, J. D. Morales Mendoza, R. W. Schnee, M. Ghaith, Amy Roberts, D. Toback, Ruth Lawrence, T. Binder, Bruno Serfass, A. Kubik, Matt Pyle, T. Aralis, J. Corbett, J. Camilleri, D. Jardin, Matthew Fritts, H. Meyer Zu Theenhausen, V. K. S. Kashyap, C. Stanford, M. I. Hollister, R. Bhattacharyya, Vuk Mandic, E. Michielin, D. H. Wright, A. Sattari, E. Reid, S. J. Yellin, Tsuguo Aramaki, Enectali Figueroa-Feliciano, R. Ren, F. De Brienne, G. Gerbier, R. Germond, I. Alkhatib, B. A. Hines, S. Zuber, Betty A. Young, Seema Verma, B. von Krosigk, Yu. G. Kolomensky, S. L. Watkins, S. Nagorny, E. Fascione, John Wilson, D. B. MacFarlane, David G. Cerdeño, R. Bunker, Emily Z. Zhang, V. Iyer, R. Chen, R. Podviianiuk, R. Underwood, Ben Loer, Jodi Cooley, A. N. Villano, S. M. Oser, Xingbo Zhao, T. Reynolds, I. Ataee Langroudy, D. Barker, M. L. di Vacri, S. Scorza, W. Rau, N. Chott, and UAM. Departamento de Física Teórica

Subjects
Physics - Instrumentation and Detectors, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Above Grounds, Phonon, Dark matter, General Physics and Astronomy, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Cryogenic Detectors, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Light Dark Matter, Scattering Cross Section, 0103 physical sciences, Energy Resolutions, Dark Matter Searches, 010306 general physics, Light dark matter, Physics, Dark Matter Particles, 010308 nuclear & particles physics, Scattering, Detector, Resolution (electron density), Física, Instrumentation and Detectors (physics.ins-det), Particle, High Energy Physics::Experiment, Energy (signal processing), Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present limits on spin-independent dark matter-nucleon interactions using a $10.6$ $\mathrm{g}$ Si athermal phonon detector with a baseline energy resolution of $\sigma_E=3.86 \pm 0.04$ $(\mathrm{stat.})^{+0.19}_{-0.00}$ $(\mathrm{syst.})$ $\mathrm{eV}$. This exclusion analysis sets the most stringent dark matter-nucleon scattering cross-section limits achieved by a cryogenic detector for dark matter particle masses from $93$ to $140$ $\mathrm{MeV}/c^2$, with a raw exposure of $9.9$ $\mathrm{g}\cdot\mathrm{d}$ acquired at an above-ground facility. This work illustrates the scientific potential of detectors with athermal phonon sensors with eV-scale energy resolution for future dark matter searches., Comment: 7 pages, 4 figures, this version includes ancillary files from official data release

Published
2020
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5. Input comparison of radiogenic neutron estimates for ultra-low background experiments

Author

H. Qiu, K. J. Palladino, M. Selvi, Jodi Cooley, Chao Zhang, and S. Scorza

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Proton decay, Dark matter, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Cosmology, Nuclear physics, 0103 physical sciences, Neutron, Neutrino, Astrophysics - Instrumentation and Methods for Astrophysics, 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Instrumentation, Event (particle physics), Spontaneous fission
Abstract

Ultra-low-background experiments address some of the most important open questions in particle physics, cosmology and astrophysics: the nature of dark matter, whether the neutrino is its own antiparticle, and does the proton decay. These rare event searches require well-understood and minimized backgrounds. Simulations are used to understand backgrounds caused by naturally occurring radioactivity in the rock and in every piece of shielding and detector material used in these experiments. Most important are processes like spontaneous fission and ( α ,n) reactions in material close to the detectors that can produce neutrons. A comparison study of the ( α ,n) reactions between two dedicated software packages is detailed. The cross section libraries, neutron yields, and spectra from the Mei–Zhang–Hime and the SOURCES-4A codes are presented. The resultant yields and spectra are used as inputs to direct dark matter detector toy models in GEANT4, to study the impact of their differences on background estimates and fits. Although differences in neutron yield calculations up to 50% were seen, there was no systematic difference between the Mei–Hime–Zhang and SOURCES-4A results. Neutron propagation simulations smooth differences in spectral shape and yield, and both tools were found to meet the broad requirements of the low-background community.

Published
2018

6. A database for storing the results of material radiopurity measurements

Author

K. D. Nguyen, G. A. Cox, Alan Poon, Z. Li, J. C. Loach, and Jodi Cooley

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Data management, FOS: Physical sciences, Radiopurity, Certification, computer.software_genre, Atomic, 01 natural sciences, Database, Particle and Plasma Physics, Software, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, Materials, Nuclear Experiment, Instrumentation, Physics, Radiation, 010308 nuclear & particles physics, business.industry, WIMP dark matter, Molecular, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, Other Physical Sciences, Data format, Neutrinoless double-beta decay, Data compilation, business, computer, Astronomical and Space Sciences
Abstract

© 2016 Elsevier B.V. Searches for rare nuclear processes, such as neutrinoless double beta-decay and the interactions of WIMP dark matter, are motivating experiments with ever-decreasing levels of radioactive backgrounds. These background reductions are achieved using various techniques, but amongst the most important is minimizing radioactive contamination in the materials from which the experiment is constructed. To this end there have been decades of advances in material sourcing, manufacture and certification, during which researchers have accumulated many thousands of measurements of material radiopurity. Some of these assays are described in publications, others are in databases, but many are still communicated informally. Until this work, there has been no standard format for encoding assay results and no effective, central location for storing them. The aim of this work is to address these long-standing problems by creating a concise and flexible material assay data format and powerful software application to manipulate it. A public installation of this software, available at http://www.radiopurity.org, is the largest database of assay results ever compiled and is intended as a long-term repository for the community's data.

Published
2016

7. Nuclear-recoil energy scale in CDMS II silicon dark-matter detectors

Author

X. Zhao, T. Binder, G.L. Godfrey, J. D. Morales Mendoza, R. Underwood, Martin E. Huber, Tarek Saab, K. Schneck, N. Mast, E. H. Miller, M. Pepin, R. Germond, Yi Chen, B. Welliver, J. Hall, A. W. Borgland, H. R. Harris, W. A. Page, Amy Roberts, Yu Kai Chang, S. Fallows, A. N. Villano, Betty A. Young, M. Ghaith, A. Kubik, R. W. Schnee, V. Iyer, S. M. Oser, R. Basu Thakur, Miguel Daal, H. A. Tanaka, S. J. Yellin, Tsuguo Aramaki, A. Phipps, Hassan Chagani, David G. Cerdeño, K. L. Page, T. Doughty, P. Lukens, S. Banik, R. Partridge, Robert A. Moffatt, Kevin A. McCarthy, John Wilson, B. Cornell, R. Calkins, E. Fascione, Sunil Golwala, P. Redl, Ziqing Hong, P. L. Brink, M. Stein, David Moore, M. Peñalver Martinez, Adam Anderson, M. J. Wilson, E. M. Dragowsky, J. K. Nelson, Donald J. Holmgren, C. Cartaro, W. Rau, David O. Caldwell, H. E. Rogers, M. A. Bowles, P. Cushman, J. Sander, S. Scorza, Danielle Speller, H. Qiu, P. Di Stefano, R. Agnese, J. Street, D. Balakishiyeva, L. Hsu, D. Toback, Matt Pyle, Bruno Serfass, Kartik Senapati, D. Jardin, R. Mahapatra, A. Leder, R. Bunker, A. Reisetter, D. MacDonell, C. Jena, G. Gerbier, L. Esteban, D. Barker, Jodi Cooley, M. H. Kelsey, D. A. Bauer, S. S. Poudel, W. Baker, J. J. Yen, Matthew Fritts, Vuk Mandic, X. Zhang, N. Mirabolfathi, Bedangadas Mohanty, A. Jastram, A. Kennedy, Blas Cabrera, Enectali Figueroa-Feliciano, E. Lopez Asamar, Noah Kurinsky, B. von Krosigk, Bernard Sadoulet, A. E. Robinson, and Douglas Wright

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Dark matter, FOS: Physical sciences, Electron, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Recoil, Ionization, 0103 physical sciences, Neutron, Physics::Atomic Physics, 010306 general physics, Nuclear Experiment, Instrumentation and Methods for Astrophysics (astro-ph.IM), Instrumentation, Physics, Elastic scattering, 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), 3. Good health, Semiconductor detector, Cryogenic Dark Matter Search, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The Cryogenic Dark Matter Search (CDMS II) experiment aims to detect dark matter particles that elastically scatter from nuclei in semiconductor detectors. The resulting nuclear-recoil energy depositions are detected by ionization and phonon sensors. Neutrons produce a similar spectrum of low-energy nuclear recoils in such detectors, while most other backgrounds produce electron recoils. The absolute energy scale for nuclear recoils is necessary to interpret results correctly. The energy scale can be determined in CDMS II silicon detectors using neutrons incident from a broad-spectrum $^{252}$Cf source, taking advantage of a prominent resonance in the neutron elastic scattering cross section of silicon at a recoil (neutron) energy near 20 (182) keV. Results indicate that the phonon collection efficiency for nuclear recoils is $4.8^{+0.7}_{-0.9}$% lower than for electron recoils of the same energy. Comparisons of the ionization signals for nuclear recoils to those measured previously by other groups at higher electric fields indicate that the ionization collection efficiency for CDMS II silicon detectors operated at $\sim$4 V/cm is consistent with 100% for nuclear recoils below 20 keV and gradually decreases for larger energies to $\sim$75% at 100 keV. The impact of these measurements on previously published CDMS II silicon results is small., Comment: 22 pages, 17 figures, 1 table, 1 appendix

Published
2018

8. Energy loss due to defect formation from 206Pb recoils in SuperCDMS germanium detectors

Author

I. J. Arnquist, Steve Yellin, D. Toback, Dennis Wright, R. Mahapatra, Nicholas Mast, Andrew Scarff, Todd Doughty, Vijay Iyer, Lauren Hsu, Allison Kennedy, Betty A. Young, Danika MacDonell, Amy Roberts, Dan Jardin, R. Germond, Vuk Mandic, Matt Pyle, P. Cushman, Jorge Morales, A. N. Villano, Dan Bauer, S. M. Oser, John L. Orrell, Matthew Wilson, Kartik Senapati, Francisco Ponce, Alan Robinson, Ryan Underwood, Concetta Cartaro, Belina von Krosigk, Hang Qiu, J. Street, William Page, Brett Cornell, Jodi Cooley, S. L. Watkins, Ben Loer, Andrew Kubik, M. Pepin, Eric W. Hoppe, Hirohisa Tanaka, Michael Bowles, R. Calkins, J. Sander, E. H. Miller, David G. Cerdeño, Angela Reisetter, Xiaohe Zhang, Rusty Harris, T. Aralis, Samir Banik, Jon Wilson, Paul Brink, Eleanor Fascione, N. Mirabolfathi, Bedangadas Mohanty, Wolfgang Rau, Matthew Stein, Blas Cabrera, Richard Lawrence, Elias Lopez-Asamar, Sudip Poudel, Matt Fritts, Bruno Serfass, Silvia Scorza, Chitrasen Jena, Noah Kurinsky, Elham Azadbakht, R. Bunker, Muad Ghaith, D'Ann Barker, Bernard Sadoulet, Hannah Rogers, Philippe Di Stefano, R. W. Schnee, Tyler Reynolds, Sunil Golwala, Yen-Yung Chang, Tom Ren, Jack Nelson, William Baker, R. Partridge, Pat Lukens, Martin E. Huber, Danielle Speller, Ziqing Hong, Gilles Gerbier, C. W. Fink, Michael Kelsey, Tali Figueroa, Robert Agnese, Joshua Winchell, Xuji Zhao, Tsuguo Aramaki, Tarek Saab, and Thomas Binder

Subjects
Energy loss, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), Dark matter, FOS: Physical sciences, chemistry.chemical_element, Germanium, Applied Physics (physics.app-ph), 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Detector, Instrumentation and Detectors (physics.ins-det), Physics - Applied Physics, Threshold energy, chemistry, Frenkel defect, Cryogenic Dark Matter Search, Energy (signal processing), Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The Super Cryogenic Dark Matter Search experiment (SuperCDMS) at the Soudan Underground Laboratory studied energy loss associated with Frenkel defect formation in germanium crystals at mK temperatures using in situ $^{210}$Pb sources. We examine the spectrum of $^{206}$Pb nuclear recoils near its expected 103 keV endpoint energy and determine an energy loss of $\left(6.08\pm0.18\right)$ %, which we attribute to defect formation. From this result and using TRIM simulations, we extract the first experimentally determined average displacement threshold energy of $\left(19.7^{+0.6}_{-0.5}\right)$ eV for germanium. This has implications for the analysis thresholds of future germanium-based dark matter searches., 4 Figures, Two data files, One data release description file

Published
2018

9. Production Rate Measurement of Tritium and Other Cosmogenic Isotopes in Germanium with CDMSlite

Author

H. R. Harris, B. Loer, B. Serfass, W. A. Page, S. Scorza, E. Azadbakht, David G. Cerdeño, John L. Orrell, D. MacDonell, C. Cartaro, M. A. Bowles, Enectali Figueroa-Feliciano, R. Calkins, R. Ren, N. Mirabolfathi, Yu Kai Chang, A. N. Villano, S. M. Oser, Jodi Cooley, John Wilson, B. von Krosigk, G. Gerbier, Xingbo Zhao, T. Reynolds, Betty A. Young, J. Winchell, S. J. Yellin, Tsuguo Aramaki, H. E. Rogers, M. Ghaith, A. Kubik, S. L. Watkins, P. Cushman, J. D. Morales Mendoza, A. Kennedy, Blas Cabrera, Chitrasen Jena, H. A. Tanaka, P. L. Brink, Bernard Sadoulet, A. Scarff, H. Qiu, A. E. Robinson, R. Partridge, Matt Pyle, E. Lopez Asamar, Noah Kurinsky, B. Cornell, R. Underwood, D. Barker, T. Aralis, Kartik Senapati, D. Jardin, R. Agnese, Danielle Speller, I. J. Arnquist, Ruth Lawrence, Tarek Saab, N. Mast, P. Lukens, L. Hsu, T. Binder, Sunil Golwala, D. Toback, M. H. Kelsey, D. H. Wright, Ziqing Hong, R. Bunker, M. Stein, C. W. Fink, M. J. Wilson, S. Banik, Eric W. Hoppe, A. Reisetter, Martin E. Huber, W. Rau, Matthew Fritts, R. Germond, Vuk Mandic, J. K. Nelson, J. Sander, R. W. Schnee, M. Pepin, X. Zhang, Bedangadas Mohanty, A. Jastram, D. A. Bauer, S. S. Poudel, W. Baker, Fernando Ponce, E. Fascione, Amy Roberts, T. Doughty, J. Street, R. Mahapatra, V. Iyer, and E. H. Miller

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics - Instrumentation and Detectors, Dark matter, chemistry.chemical_element, FOS: Physical sciences, Germanium, Radiation, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Ionization, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010303 astronomy & astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Nuclear Experiment, Physics, Radionuclide, Isotope, 010308 nuclear & particles physics, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), Semiconductor detector, chemistry, Tritium, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Future direct searches for low-mass dark matter particles with germanium detectors, such as SuperCDMS SNOLAB, are expected to be limited by backgrounds from radioactive isotopes activated by cosmogenic radiation inside the germanium. There are limited experimental data available to constrain production rates and a large spread of theoretical predictions. We examine the calculation of expected production rates, and analyze data from the second run of the CDMS low ionization threshold experiment (CDMSlite) to estimate the rates for several isotopes. We model the measured CDMSlite spectrum and fit for contributions from tritium and other isotopes. Using the knowledge of the detector history, these results are converted to cosmogenic production rates at sea level. The production rates in atoms/(kg$\cdot$day) are 74$\pm$9 for $^3$H, 1.5$\pm$0.7 for $^{55}$Fe, 17$\pm$5 for $^{65}$Zn, and 30$\pm$18 for $^{68}$Ge., 14 pages, 10 figures, 5 tables. v5 contains the extended data release (and documentation) of the CDMSlite Run 2 data as ancillary files

Published
2018

10. First Dark Matter Constraints from a SuperCDMS Single-Charge Sensitive Detector

Author

C. Stanford, A. N. Villano, S. M. Oser, T. Reynolds, John L. Orrell, R. Underwood, D. MacDonell, B. Cornell, H. R. Harris, J. Street, W. A. Page, John Wilson, A. Scarff, C. Cartaro, P. L. Brink, Hiromasa Tanaka, Ruth Lawrence, E. Fascione, M. Pepin, N. Mirabolfathi, M. Ghaith, A. Kubik, D. Jardin, D. A. Bauer, J. D. Morales Mendoza, Sunil Golwala, S. S. Poudel, T. Doughty, W. Baker, Xingbo Zhao, Tarek Saab, N. Mast, S. Scorza, C. W. Fink, J. K. Nelson, R. Mahapatra, Fernando Ponce, R. Germond, R. W. Schnee, X. Zhang, M. H. Kelsey, B. Loer, B. Serfass, J. V. Leyva, M. Stein, D. Barker, Bedangadas Mohanty, J. Sander, T. Aralis, Amy Roberts, R. Agnese, Martin E. Huber, Betty A. Young, David G. Cerdeño, B. von Krosigk, E. H. Miller, P. Cushman, D. H. Wright, A. Phipps, Yu Kai Chang, R. K. Romani, Jodi Cooley, M. A. Bowles, S. Banik, Eric W. Hoppe, A. Kennedy, Matt Pyle, Blas Cabrera, Chitrasen Jena, T. Binder, S. J. Yellin, Tsuguo Aramaki, Matthew Fritts, Kartik Senapati, E. Azadbakht, Noah Kurinsky, Vuk Mandic, Enectali Figueroa-Feliciano, R. Partridge, R. Calkins, E. Lopez Asamar, V. Iyer, S. L. Watkins, J. Winchell, Bernard Sadoulet, A. E. Robinson, Danielle Speller, P. Lukens, P. Di Stefano, Ziqing Hong, M. J. Wilson, H. E. Rogers, H. Qiu, R. Bunker, A. Reisetter, W. Rau, J. So, G. Gerbier, I. J. Arnquist, L. Hsu, and D. Toback

Subjects
Physics, Photon, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, Dark matter, General Physics and Astronomy, FOS: Physical sciences, Charge (physics), Instrumentation and Detectors (physics.ins-det), Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 7. Clean energy, Dark photon, Semiconductor detector, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Excited state, 0103 physical sciences, 010306 general physics, Absorption (electromagnetic radiation), Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present the first limits on inelastic electron-scattering dark matter and dark photon absorption using a prototype SuperCDMS detector having a charge resolution of 0.1 electron-hole pairs (CDMS HVeV, a 0.93 gram CDMS HV device). These electron-recoil limits significantly improve experimental constraints on dark matter particles with masses as low as 1 MeV/$\mathrm{c^2}$. We demonstrate a sensitivity to dark photons competitive with other leading approaches but using substantially less exposure (0.49 gram days). These results demonstrate the scientific potential of phonon-mediated semiconductor detectors that are sensitive to single electronic excitations., 6 pages + title and references, 6 figures, includes erratum submitted to PRL and data release

Published
2018

11. Results from the Super Cryogenic Dark Matter Search Experiment at Soudan

Author

Tarek Saab, N. Mast, A. N. Villano, S. M. Oser, P. L. Brink, C. Cartaro, T. Reynolds, H. R. Harris, D. A. Bauer, W. A. Page, B. Welliver, S. S. Poudel, W. Baker, N. Mirabolfathi, Enectali Figueroa-Feliciano, R. Partridge, A. Kennedy, J. J. Yen, Jodi Cooley, Blas Cabrera, Betty A. Young, B. Cornell, Chitrasen Jena, D. H. Wright, D. Balakishiyeva, A. Phipps, S. Banik, Eric W. Hoppe, J. D. Morales Mendoza, Noah Kurinsky, Xingbo Zhao, A. E. Robinson, Yu Kai Chang, T. Binder, S. Scorza, Matthew Fritts, D. Barker, Bernard Sadoulet, Vuk Mandic, Sunil Golwala, I. J. Arnquist, G. Godfrey, Amy Roberts, P. Di Stefano, Martin E. Huber, M. H. Kelsey, S. J. Yellin, Tsuguo Aramaki, D. Jardin, John Wilson, M. Stein, D. O. Caldwell, L. Hsu, P. Cushman, E. Lopez Asamar, R. Agnese, R. Underwood, D. Toback, J. Hall, Miguel Daal, J. K. Nelson, X. Zhang, M. Peñalver Martinez, Bedangadas Mohanty, Matt Pyle, M. A. Bowles, B. von Krosigk, A. Jastram, Kartik Senapati, J. Sander, Hiromasa Tanaka, John L. Orrell, D. MacDonell, K. Schneck, E. Fascione, M. Pepin, V. Iyer, R. W. Schnee, R. Basu Thakur, K. L. Page, R. Calkins, T. Doughty, H. E. Rogers, H. Qiu, P. Redl, B. Loer, B. Serfass, E. H. Miller, R. Germond, Yi Chen, P. Lukens, Ziqing Hong, M. J. Wilson, Danielle Speller, M. Ghaith, A. Kubik, R. Mahapatra, J. Street, David G. Cerdeño, G. Gerbier, R. Bunker, A. Reisetter, and W. Rau

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Weakly interacting massive particles, 0103 physical sciences, General Physics and Astronomy, Cryogenic Dark Matter Search, 010306 general physics, 01 natural sciences, Event (particle physics)
Abstract

We report the result of a blinded search for weakly interacting massive particles (WIMPs) using the majority of the SuperCDMS Soudan data set. With an exposure of 1690 kg d, a single candidate event is observed, consistent with expected backgrounds. This analysis (combined with previous Ge results) sets an upper limit on the spin-independent WIMP–nucleon cross section of 1.4×10−44 (1.0×10−44) cm2 at 46 GeV/c2. These results set the strongest limits for WIMP–germanium-nucleus interactions for masses >12 GeV/c2.

Published
2018

12. Radon Daughter Plate-out Measurements at SNOLAB for Polyethylene and Copper

Author

M. Stein, Ben Loer, S. Scorza, Ray Bunker, Dan Bauer, Jodi Cooley, and R. Calkins

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Radiochemistry, FOS: Physical sciences, chemistry.chemical_element, Radon, Polyethylene, 01 natural sciences, Copper, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, chemistry, 13. Climate action, 0103 physical sciences, Activity concentration, Emissivity, 010306 general physics, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Instrumentation
Abstract

Polyethylene and copper samples were exposed to the underground air at SNOLAB for approximately three months while several environmental factors were monitored. Predictions of the radon-daughter plate-out rate are compared to the resulting surface activities, obtained from high-sensitivity measurements of alpha emissivity using the XIA UltraLo-1800 spectrometer at SMU. From these measurements, we determine an average $^{210}$Pb plate-out rate of 249 and 423 atoms/day/cm$^{2}$ for polyethylene and copper, respectively, when exposed to radon activity of 135 Bq/m$^{3}$ at SNOLAB. A time-dependent model of alpha activity is discussed for these materials placed in similar environmental conditions., 7 pages, 7 figures

Published
2017

13. Projected sensitivity of the SuperCDMS SNOLAB experiment

Author

Xingbo Zhao, C. Cartaro, M. A. Bowles, R. Agnese, A. N. Villano, S. M. Oser, B. Welliver, John L. Orrell, Jodi Cooley, H. R. Harris, W. A. Page, David G. Cerdeño, G. Gerbier, Tarek Saab, N. Mast, I. J. Arnquist, Sunil Golwala, M. H. Kelsey, R. Underwood, D. Jardin, John Wilson, Bernard Sadoulet, L. Hsu, Hiromasa Tanaka, P. Di Stefano, M. Pepin, E. Lopez Asamar, N. Mirabolfathi, D. Toback, P. Redl, R. Basu Thakur, K. L. Page, R. Mahapatra, A. Leder, R. Calkins, H. E. Rogers, B. Cornell, Donald J. Holmgren, H. Qiu, A. W. Borgland, J. Street, D. Barker, J. D. Morales Mendoza, Danielle Speller, R. Bunker, J. J. Yen, S. Fallows, A. Reisetter, S. J. Yellin, Tsuguo Aramaki, M. Ghaith, Matt Pyle, W. Rau, V. Iyer, T. Doughty, A. Kubik, D. A. Bauer, Amy Roberts, S. S. Poudel, Enectali Figueroa-Feliciano, W. Baker, J. Sander, L. Esteban, P. Lukens, H. Chagani, Ziqing Hong, R. Partridge, Adam Anderson, Matthew Fritts, A. E. Robinson, Vuk Mandic, Yi Chen, Betty A. Young, T. Hofer, A. Phipps, M. Stein, X. Zhang, Miguel Daal, Robert A. Moffatt, A. Jastram, P. L. Brink, David O. Caldwell, D. H. Wright, Eric W. Hoppe, A. Kennedy, Blas Cabrera, Noah Kurinsky, K. Schneck, B. von Krosigk, B. Loer, B. Serfass, R. W. Schnee, P. Cushman, G.L. Godfrey, Martin E. Huber, and J. Hall

Subjects
Particle physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Solar neutrino, Dark matter, FOS: Physical sciences, Atomic, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, Recoil, 0103 physical sciences, Nuclear, 010306 general physics, physics.ins-det, Physics, Quantum Physics, hep-ex, 010308 nuclear & particles physics, Detector, Molecular, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, Orders of magnitude (time), Weakly interacting massive particles, astro-ph.CO, High Energy Physics::Experiment, Cryogenic Dark Matter Search, Neutrino, Astronomical and Space Sciences, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

SuperCDMS SNOLAB will be a next-generation experiment aimed at directly detecting low-mass (< 10 GeV/c$^2$) particles that may constitute dark matter by using cryogenic detectors of two types (HV and iZIP) and two target materials (germanium and silicon). The experiment is being designed with an initial sensitivity to nuclear recoil cross sections ~ 1 x 10$^{-43}$ cm$^2$ for a dark matter particle mass of 1 GeV/c$^2$, and with capacity to continue exploration to both smaller masses and better sensitivities. The phonon sensitivity of the HV detectors will be sufficient to detect nuclear recoils from sub-GeV dark matter. A detailed calibration of the detector response to low energy recoils will be needed to optimize running conditions of the HV detectors and to interpret their data for dark matter searches. Low-activity shielding, and the depth of SNOLAB, will reduce most backgrounds, but cosmogenically produced $^{3}$H and naturally occurring $^{32}$Si will be present in the detectors at some level. Even if these backgrounds are x10 higher than expected, the science reach of the HV detectors would be over three orders of magnitude beyond current results for a dark matter mass of 1 GeV/c$^2$. The iZIP detectors are relatively insensitive to variations in detector response and backgrounds, and will provide better sensitivity for dark matter particle masses (> 5 GeV/c$^2$). The mix of detector types (HV and iZIP), and targets (germanium and silicon), planned for the experiment, as well as flexibility in how the detectors are operated, will allow us to maximize the low-mass reach, and understand the backgrounds that the experiment will encounter. Upgrades to the experiment, perhaps with a variety of ultra-low-background cryogenic detectors, will extend dark matter sensitivity down to the "neutrino floor", where coherent scatters of solar neutrinos become a limiting background., SuperCDMS SNOLAB Projected sensitivity reach

Published
2017

14. Dark Matter Still at Large

Author

Jodi Cooley

Subjects
Physics, 010308 nuclear & particles physics, 0103 physical sciences, Dark matter, Mixed dark matter, Warm dark matter, Astrophysics, 010303 astronomy & astrophysics, 01 natural sciences
Published
2017

15. New Results from the Search for Low-Mass Weakly Interacting Massive Particles with the CDMS Low Ionization Threshold Experiment

Author

B. Welliver, B. Shank, Matt Pyle, J. J. Yen, D. Barker, B. Loer, J. Hall, T. Doughty, B. Serfass, G. L. Godfrey, D. Jardin, R. Agnese, R. Basu Thakur, K. L. Page, Jodi Cooley, R. Calkins, H. R. Harris, N. Mirabolfathi, W. A. Page, Yi Chen, David G. Cerdeño, T. Hofer, D. Balakishiyeva, Y. Ricci, L. Esteban, R. Bunker, J. Zhang, J. D. Morales Mendoza, A. Jastram, M. Asai, A. Reisetter, Miguel Daal, S. Fallows, W. Rau, H. E. Rogers, P. Redl, Sunil Golwala, A. Kennedy, Martin E. Huber, D. A. Bauer, S. J. Yellin, Tsuguo Aramaki, H. Qiu, W. Baker, John Wilson, Blas Cabrera, Tarek Saab, N. Mast, Bernard Sadoulet, Robert A. Moffatt, E. Lopez Asamar, Amy Roberts, A. Borgland, Vuk Mandic, O. Kamaev, K. Prasad, A. Leder, B. Cornell, S. Upadhyayula, R. Underwood, J. Billard, M. Pepin, R. Partridge, Enectali Figueroa-Feliciano, R. W. Schnee, P. Cushman, M. H. Kelsey, Betty A. Young, A. Phipps, J. Sander, L. Hsu, D. Toback, M. Ghaith, P. Lukens, B. Kara, Adam Anderson, R. Mahapatra, H. Chagani, Donald J. Holmgren, Danielle Speller, M. A. Bowles, K. Schneck, D. H. Wright, P. L. Brink, David O. Caldwell, A. N. Villano, S. M. Oser, S. Scorza, and P. Di Stefano

Subjects
Physics, Particle physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Phonon, Astrophysics::Instrumentation and Methods for Astrophysics, General Physics and Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, Electron, Parameter space, 01 natural sciences, Semiconductor detector, Nuclear physics, WIMP, Weakly interacting massive particles, Ionization, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Low Mass
Abstract

© 2016 American Physical Society. The CDMS low ionization threshold experiment (CDMSlite) uses cryogenic germanium detectors operated at a relatively high bias voltage to amplify the phonon signal in the search for weakly interacting massive particles (WIMPs). Results are presented from the second CDMSlite run with an exposure of 70 kg day, which reached an energy threshold for electron recoils as low as 56 eV. A fiducialization cut reduces backgrounds below those previously reported by CDMSlite. New parameter space for the WIMP-nucleon spin-independent cross section is excluded for WIMP masses between 1.6 and 5.5 GeV/c2.

Published
2016

16. Studies on the Reduction of Radon Plate-Out

Author

Stephen Jacob Sekula, M. Nakib, Jodi Cooley, R. Calkins, and M. Bruemmer

Subjects
Materials science, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Stable isotope ratio, Radiochemistry, chemistry.chemical_element, FOS: Physical sciences, Radon, Alpha particle, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Copper, 030218 nuclear medicine & medical imaging, High Energy Physics - Experiment, 03 medical and health sciences, High Energy Physics - Experiment (hep-ex), 0302 clinical medicine, chemistry, 13. Climate action, Double beta decay, 0103 physical sciences, Particle, Neutron, Gas mantle
Abstract

The decay of common radioactive gases, such as radon, produces stable isotopes by a sequence of daughter particles with varied half-lives. These daughter particles are a significant source of gamma, neutron, and alpha particle backgrounds that can mimic desired signals in dark matter and neutrinoless double beta decay experiments. In the LUMINA Laboratory at Southern Methodist University (SMU), studies of radon plate-out onto copper samples are conducted using one of XIA's first five UltraLo 1800 alpha counters. We present results from investigations into various mitigation approaches. A custom-built copper holder (in either plastic or metal) has been designed and produced to maximize the copper's exposure to 220Rn. The 220Rn source is a collection of camping lantern mantles. We present the current status of control and experimental methods for addressing radon exposure levels., Comment: 4 pages, 1 figure, Conference Proceedings for Low Radioactivity Techniques 2015

Published
2015
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17. Overview of Non-Liquid Noble Direct Detection Dark Matter Experiments

Author

Jodi Cooley

Subjects
Physics, Current generation, Physics - Instrumentation and Detectors, Field (physics), 010308 nuclear & particles physics, Dark matter, FOS: Physical sciences, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Engineering physics, Space and Planetary Science, 0103 physical sciences, Current (fluid), 010306 general physics, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract

In the last few years many advances have been made in the field of dark matter direct detection. In this article I will review the progress and status of experiments that employ detection techniques that do not use noble liquids. First, I will give an introduction to the field of dark matter and discuss the background challenges that confront all dark matter experiments. I will also discuss various detection techniques employed by the current generation and the next generation of dark matter experiments. Finally, I will discuss recent results and the status of current and future direct detection experiments., 19 pages, 1 figure. In Proceedings of the 13th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2013

Published
2014

18. Silicon detector dark matter results from the final exposure of CDMS II

Author

Matthew Fritts, Jeffrey P. Filippini, G.L. Godfrey, Jodi Cooley, M. H. Kelsey, Vuk Mandic, K. Prasad, S. A. Hertel, P. L. Brink, David O. Caldwell, Y. Ricci, T. Hofer, P. Nadeau, Steven W. Leman, M. Kos, B. Shank, D. Balakishiyeva, Martin E. Huber, Donald J. Holmgren, P. Cushman, J. Sander, K. Koch, A. W. Borgland, C. H. Crewdson, D. A. Bauer, L. Esteban, Miguel Daal, R. Basu Thakur, R. Partridge, A. Jastram, K. L. Page, S. Scorza, P. Redl, B. Loer, J. Hall, B. Serfass, R. H. Harris, Cristián Martínez, David Moore, Robert A. Moffatt, Bernard Sadoulet, S. Arrenberg, P. Kim, K. Schneck, J. J. Yen, H. Qiu, B. Kara, Z. Ahmed, R. Bunker, A. N. Villano, T. Bruch, B. Welliver, Betty A. Young, Sunil Golwala, A. Kennedy, Danielle Speller, David G. Cerdeño, N. Mirabolfathi, Douglas Wright, A. Reisetter, B. Cornell, Blas Cabrera, A. Phipps, K. M. Sundqvist, L. Hsu, W. Rau, R. Mahapatra, Kevin A. McCarthy, H. Chagani, R. W. Schnee, J. Fox, O. Kamaev, J. Zhang, F. DeJongh, E. Do Couto E Silva, Adam Anderson, D. Brandt, R. Agnese, S. Fallows, Enectali Figueroa-Feliciano, M. Kiveni, S. J. Yellin, Matt Pyle, E. Lopez Asamar, Tarek Saab, J. Yoo, J. Billard, M. Pepin, R. H. Nelson, T. Doughty, and UAM. Departamento de Física Teórica

Subjects
Particle physics, Physics - Instrumentation and Detectors, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Dark matter, FOS: Physical sciences, General Physics and Astronomy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Recoil, WIMP, 0103 physical sciences, Neutron, 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Physics, 010308 nuclear & particles physics, Física, Instrumentation and Detectors (physics.ins-det), Confidence interval, Semiconductor detector, Likelihood-ratio test, Weakly interacting massive particles, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We report results of a search for Weakly Interacting Massive Particles (WIMPS) with the silicon detectors of the CDMS II experiment. This blind analysis of 140.2 kg-days of data taken between July 2007 and September 2008 revealed three WIMP-candidate events with a surface-event background estimate of 0.41^{+0.20}_{-0.08}(stat.)^{+0.28}_{-0.24}(syst.). Other known backgrounds from neutrons and 206Pb are limited to < 0.13 and, 5 pages, 4 figures, as accepted by PRL

Published
2013

19. Demonstration of surface electron rejection with interleaved germanium detectors for dark matter searches

Author

C. J. Kenney, R. Partridge, R. Mahapatra, S. Fallows, R. Basu Thakur, S. Kenany, T. Doughty, Jodi Cooley, Adam Anderson, Jean-Paul Fox, K. L. Page, B. Shank, A. Jastram, D. A. Bauer, S. A. Hertel, Enectali Figueroa-Feliciano, K. Schneck, Jie Zhang, B. Loer, B. Serfass, H. R. Harris, S. J. Yellin, E. Lopez Asamar, O. Kamaev, L. Esteban, B. Kara, S. Scorza, P. Nadeau, A. Phipps, A. Kennedy, Jasmine Hasi, A. N. Villano, Danielle Speller, P. L. Brink, R. Resch, R. W. Schnee, M. H. Kelsey, Matthew Fritts, Y. Ricci, David G. Cerdeño, R. Radpour, B. Cornell, Blas Cabrera, Vuk Mandic, B. Welliver, R. Schmitt, David O. Caldwell, P. Redl, Sunil Golwala, P. Cushman, M. Kiveni, K. Prasad, Tarek Saab, Matt Pyle, Cristián Martínez, Donald J. Holmgren, Kevin A. McCarthy, P. C. F. Di Stefano, Betty A. Young, E. Do Couto E Silva, C. H. Crewdson, A. W. Borgland, T. Hofer, D. Balakishiyeva, M. Daal, R. Bunker, B. A. Hines, Robert A. Moffatt, Bernard Sadoulet, A. Reisetter, R. Nelson, David Moore, W. Rau, N. Mirabolfathi, R. Agnese, M. Pepin, J. J. Yen, M. Cherry, J. Sander, J. Hall, Astrid Tomada, M. E. Huber, D. Wright, H. Chagani, K. Koch, L. Novak, D. N. Seitz, H. Qiu, G. Godfrey, L. Hsu, D. Brandt, UAM. Departamento de Física Teórica, Massachusetts Institute of Technology. Department of Physics, Anderson, Adam Jonathan, Figueroa-Feliciano, Enectali, Hertel, Scott Alexander, and McCarthy, Kevin Ahmad

Subjects
Particle physics, Ionization, Technology, Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), astro-ph.GA, Dark matter, FOS: Physical sciences, chemistry.chemical_element, Cosmic ray, Germanium, Electron, Cryogenics, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Engineering, 0103 physical sciences, 010306 general physics, Electrodes, physics.ins-det, Leakage (electronics), Applied Physics, Physics, 010308 nuclear & particles physics, hep-ex, Detector, Física, Instrumentation and Detectors (physics.ins-det), Astrophysics - Astrophysics of Galaxies, Semiconductor detector, chemistry, Lead, Astrophysics of Galaxies (astro-ph.GA), Physical Sciences, Surface ionization
Abstract

The SuperCDMS experiment in the Soudan Underground Laboratory searches for dark matter with a 9-kg array of cryogenic germanium detectors. Symmetric sensors on opposite sides measure both charge and phonons from each particle interaction, providing excellent discrimination between electron and nuclear recoils, and between surface and interior events. Surface event rejection capabilities were tested with two [superscript 210] Pb sources producing ∼130 beta decays/hr. In ∼800 live hours, no events leaked into the 8–115 keV signal region, giving upper limit leakage fraction 1.7 × 10[superscript −5] at 90% C.L., corresponding to, United States. Dept. of Energy (Contract No. DE-AC03-76SF00098), United States. Dept. of Energy (Contract No. DE-FG02-92ER40701), United States. Dept. of Energy (Contract No. DE-FG02-94ER40823), United States. Dept. of Energy (Contract No. DE-FG03-90ER40569), United States. Dept. of Energy (Contract No. DE-FG03-91ER40618), United States. Dept. of Energy (Contract No. DE-SC0004022), National Science Foundation (U.S.) (Grant No. AST-9978911), National Science Foundation (U.S.) (Grant No. NSF-0847342), National Science Foundation (U.S.) (Grant No. PHY-1102795), National Science Foundation (U.S.) (Grant No. NSF-1151869), National Science Foundation (U.S.) (Grant No. PHY-0542066), National Science Foundation (U.S.) (Grant No. PHY-0503729), National Science Foundation (U.S.) (Grant No. PHY-0503629), National Science Foundation (U.S.) (Grant No. PHY-0503641), National Science Foundation (U.S.) (Grant No. PHY-0504224), National Science Foundation (U.S.) (Grant No. PHY-0705052), National Science Foundation (U.S.) (Grant No. PHY-0801708), National Science Foundation (U.S.) (Grant No. PHY-0801712), National Science Foundation (U.S.) (Grant No. PHY-0802575), National Science Foundation (U.S.) (Grant No. PHY-0847342), National Science Foundation (U.S.) (Grant No. PHY-0855299), National Science Foundation (U.S.) (Grant No. PHY-0855525), National Science Foundation (U.S.) (Grant No. PHY-1205898)

Published
2013

20. Silicon detector results from the first five-tower run of CDMS II

Author

Y. Ricci, O. Kamaev, Jeffrey P. Filippini, B. Welliver, G.L. Godfrey, Peter S. Kim, Cristián Martínez, B. Cornell, Martin E. Huber, A. W. Borgland, R. H. Nelson, E. Do Couto E Silva, Steven W. Leman, K. Koch, P. L. Brink, S. Scorza, M. Kiveni, Matt Pyle, T. Hofer, P. Cushman, T. Doughty, David O. Caldwell, D. Balakishiyeva, B. Kara, P. Di Stefano, S. Fallows, Adam Anderson, A. Jastram, A. N. Villano, S. J. Yellin, M. Kos, J. Sander, Tarek Saab, Miguel Daal, Robert A. Moffatt, Sunil Golwala, David G. Cerdeño, J. Hall, S. A. Hertel, Donald J. Holmgren, Kevin A. McCarthy, F. DeJongh, R. Partridge, R. Agnese, S. Arrenberg, P. Nadeau, J. Fox, K. Schneck, Danielle Speller, M. Pepin, R. W. Schnee, N. Mirabolfathi, H. Chagani, L. Hsu, Douglas Wright, R. Mahapatra, Jodi Cooley, J. Zhang, R. Basu Thakur, M. H. Kelsey, K. L. Page, R. H. Harris, J. Yoo, Betty A. Young, L. Esteban, A. Phipps, K. M. Sundqvist, R. Bunker, H. Qiu, T. Bruch, A. Reisetter, W. Rau, D. Brandt, D. A. Bauer, Z. Ahmed, Matthew Fritts, E. Lopez-Asamar, Vuk Mandic, K. Prasad, P. Redl, David Moore, J. J. Yen, B. Shank, B. Serfass, C. H. Crewdson, A. Kennedy, Blas Cabrera, Bernard Sadoulet, Enectali Figueroa-Feliciano, and UAM. Departamento de Física Teórica

Subjects
Nuclear and High Energy Physics, Particle physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics::Instrumentation and Detectors, Dark matter, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Parameter space, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), WIMP, 0103 physical sciences, 010306 general physics, Physics, Elastic scattering, Range (particle radiation), 010308 nuclear & particles physics, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Física, Semiconductor detector, Weakly interacting massive particles, High Energy Physics::Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAM, We report results of a search for weakly interacting massive particles (WIMPs) with the Si detectors of the CDMS II experiment. This report describes a blind analysis of the first data taken with CDMS II’s full complement of detectors in 2006–2007; results from this exposure using the Ge detectors have already been presented. We observed no candidate WIMP-scattering events in an exposure of 55.9 kg-days before analysis cuts, with an expected background of ˞1.1 events. The exposure of this analysis is equivalent to 10.3 kg-days over a recoil energy range of 7–100 keV for an ideal Si detector and a WIMP mass of 10 GeV/c2. These data set an upper limit of 1.7 x 10-41 cm2 on the WIMP-nucleon spin-independent cross section of a 10 GeV/c2 WIMP. These data exclude parameter space for spin-independent WIMP-nucleon elastic scattering that is relevant to recent searches for low-mass WIMPs, This work is supported in part by the National Science Foundation (Grants No. AST-9978911, No. NSF-1102795, No. PHY- 0847342, No. PHY-0542066, No. PHY-0503729, No. PHY- 0503629, No. PHY-0503641, No. PHY-0504224, No. PHY-0705052, No. PHY-0801708, No. PHY-0801712, No. PHY-0802575, No. PHY-0847342, No. PHY-0855299, No. PHY-0855525, No. PHY-1151869, and No. PHY- 1205898), by the Department of Energy (Contracts No. DE-AC03-76SF00098, No. DE-FG02-92ER40701, No. DE-FG03-90ER40569, No. DE-FG03-91ER40618, and No. DE-SC0004022), by the Swiss National Foundation (SNF Grant No. 20-118119), by NSERC Canada (Grants No. SAPIN 341314 and No. SAPPJ 386399), and by MULTIDARK CSD2009-00064 and FPA2012-34694. Fermilab is operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359, while SLAC is operated under Contract No. DE-AC02- 76SF00515 with the U.S. Department of Energy

Published
2013

21. Search for inelastic dark matter with the CDMS II experiment

Author

Jie Zhang, Jeffrey P. Filippini, S. A. Hertel, M. R. Dragowsky, R. Resch, L. Duong, Martin E. Huber, M. Pyle, Tarek Saab, S. Fallows, Donald J. Holmgren, S. J. Yellin, Betty A. Young, E. J. Ramberg, X. Qiu, L. Hsu, K. M. Sundqvist, H. N. Nelson, S. W. Leman, S. Arrenberg, David Moore, J. Hall, Bernard Sadoulet, M. Razeti, O. Kamaev, R. Bunker, M. Kiveni, R. Hennings-Yeomans, J. Sander, A. Reisetter, Kevin A. McCarthy, C. N. Bailey, W. Rau, S. Liu, P. L. Brink, David O. Caldwell, Enectali Figueroa-Feliciano, E. Do Couto E Silva, R. W. Ogburn, J. Yoo, D. N. Seitz, D. Balakishiyeva, N. Mirabolfathi, John Fox, M. Kos, P. C. F. Di Stefano, A. Phipps, Sunil Golwala, D. S. Akerib, P. Wikus, B. Serfass, R. Mahapatra, F. DeJongh, Blas Cabrera, Matthew Fritts, Vuk Mandic, D. A. Bauer, Jodi Cooley, M. Tarka, R. W. Schnee, Z. Ahmed, P. Cushman, T. Bruch, Laura Baudis, and M. Daal

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Cosmology and Nongalactic Astrophysics (astro-ph.CO), Energy window, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Dark matter, FOS: Physical sciences, Parameter space, Recoil energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Underground laboratory, Cryogenic Dark Matter Search, 010306 general physics, Astrophysics - Cosmology and Nongalactic Astrophysics
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., 10 pages, 10 figures, minor changes to match published version, conclusion unchanged

Published
2011

22. Results from a low-energy analysis of the CDMS II germanium data

Author

H. N. Nelson, Z. Ahmed, Laura Baudis, D. Balakishiyeva, Steven W. Leman, P. Cushman, S. Liu, C. N. Bailey, E. Do Couto E Silva, Miguel Daal, M. R. Dragowsky, R. W. Schnee, Enectali Figueroa-Feliciano, David Moore, M. Kiveni, E. J. Ramberg, N. Mirabolfathi, J. Hall, M. Pyle, S. Arrenberg, L. Hsu, T. Bruch, Bernard Sadoulet, O. Kamaev, Kevin A. McCarthy, R. Hennings-Yeomans, Jeffrey P. Filippini, P. L. Brink, F. DeJongh, Blas Cabrera, David O. Caldwell, M. Kos, L. Duong, Martin E. Huber, J. Yoo, P. Di Stefano, D. A. Bauer, B. Serfass, Jodi Cooley, J. Sander, M. Tarka, Betty A. Young, Tarek Saab, K. M. Sundqvist, Matthew Fritts, Vuk Mandic, A. Phipps, S. A. Hertel, Jie Zhang, Sunil Golwala, X. Qiu, D. S. Akerib, J. Fox, R. Resch, R. Mahapatra, S. Fallows, Donald J. Holmgren, S. J. Yellin, P. Wikus, D. N. Seitz, R. Bunker, A. Reisetter, W. Rau, and R. W. Ogburn

Subjects
Particle physics, General Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), CDMS Collaboration, Physics::Instrumentation and Detectors, Dark matter, FOS: Physical sciences, General Physics and Astronomy, chemistry.chemical_element, Germanium, Parameter space, 01 natural sciences, Mathematical Sciences, Particle detector, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Engineering, WIMP, 0103 physical sciences, 010306 general physics, Physics, 010308 nuclear & particles physics, hep-ex, Astrophysics::Instrumentation and Methods for Astrophysics, Semiconductor detector, chemistry, Weakly interacting massive particles, Physical Sciences, astro-ph.CO, High Energy Physics::Experiment, Cryogenic Dark Matter Search, Astrophysics - Cosmology and Nongalactic Astrophysics
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., 9 pages, 8 figures. Supplemental material included as ancillary files. v3) Added appendix with additional details regarding energy scale and backgrounds

Published
2011

23. Combined limits on WIMPs from the CDMS and EDELWEISS experiments

Author

Jeffrey P. Filippini, S. Henry, K. Eitel, Tarek Saab, P. Pari, M. R. Dragowsky, S. Hervé, E. Olivieri, N. Mirabolfathi, Steven W. Leman, P. Cushman, S. V. Rozov, M. A. Verdier, L. Bergé, R. W. Schnee, Martin E. Huber, Kevin A. McCarthy, D. O. Caldwell, F. DeJongh, A. S. Torrento-Coello, J. Hall, Enectali Figueroa-Feliciano, S. Arrenberg, Laura Baudis, D. Balakishiyeva, S. Fallows, Alain Benoit, P. Coulter, Y. Ricci, P. Wikus, G. Chardin, X. Defay, S. J. Yellin, R. Bunker, J. Domange, Miguel Daal, O. Kamaev, D. A. Bauer, B. Paul, A. Broniatowski, H. N. Nelson, A. Reisetter, Blas Cabrera, Cristián Martínez, S. Liu, P. L. Brink, H. Kluck, B. Censier, Z. Ahmed, W. Rau, M. Kos, V. A. Kudryavtsev, S. Scorza, J. Gascon, S. A. Hertel, G. A. Cox, Bernard Sadoulet, D. Filosofov, Y. Dolgorouki, P. Di Stefano, T. Bruch, Bruno Serfass, J. Gironnet, D. N. Seitz, P. Nadeau, E. Armengaud, R. J. Walker, L. Pattavina, R. Hennings-Yeomans, H. Kraus, M. Tarka, Max Robinson, C. Augier, M. Kiveni, M. Gros, P. Loaiza, F. Charlieux, X. Qiu, A. Phipps, R. W. Ogburn, Sunil Golwala, X. F. Navick, C. N. Bailey, M. De Jesus, D. S. Akerib, J. Fox, J. Blümer, E. Yakushev, A. Juillard, M. Pyle, L. Hsu, Jie Zhang, V. Kozlov, Jodi Cooley, Matthew Fritts, Vuk Mandic, B. Schmidt, V.B. Brudanin, M. Chapellier, L. Vagneron, N. Fourches, S. Marnieros, J. Yoo, David Moore, R. Mahapatra, Donald J. Holmgren, J. Sander, C. Nones, Betty A. Young, K. M. Sundqvist, G. Gerbier, V. Sanglard, S. Semikh, L. Dumoulin, Ahmed, Z, Akerib, D, Armengaud, E, Arrenberg, S, Augier, C, Bailey, C, Balakishiyeva, D, Baudis, L, Bauer, D, Benoit, A, Berge, L, Bluemer, J, Brink, P, Broniatowski, A, Bruch, T, Brudanin, V, Bunker, R, Cabrera, B, Caldwell, D, Censier, B, Chapellier, M, Chardin, G, Charlieux, F, Cooley, J, Coulter, P, Cox, G, Cushman, P, Daal, M, Defay, X, De Jesus, M, Dejongh, F, Di Stefano, P, Dolgorouki, Y, Domange, J, Dumoulin, L, Dragowsky, M, Eitel, K, Fallows, S, Figueroa Feliciano, E, Filippini, J, Filosofov, D, Fourches, N, Fox, J, Fritts, M, Gascon, J, Gerbier, G, Gironnet, J, Golwala, S, Gros, M, Hall, J, Hennings Yeomans, R, Henry, S, Hertel, S, Herve, S, Holmgren, D, Hsu, L, Huber, M, Juillard, A, Kamaev, O, Kiveni, M, Kluck, H, Kos, M, Kozlov, V, Kraus, H, Kudryavtsev, V, Leman, S, Liu, S, Loaiza, P, Mahapatra, R, Mandic, V, Marnieros, S, Martinez, C, Mccarthy, K, Mirabolfathi, N, Moore, D, Nadeau, P, Navick, X, Nelson, H, Nones, C, Ogburn, R, Olivieri, E, Pari, P, Pattavina, L, Paul, B, Phipps, A, Pyle, M, Qiu, X, Rau, W, Reisetter, A, Ricci, Y, Robinson, M, Rozov, S, Saab, T, Sadoulet, B, Sander, J, Sanglard, V, Schmidt, B, Schnee, R, Scorza, S, Seitz, D, Semikh, S, Serfass, B, Sundqvist, K, Tarka, M, Torrento Coello, A, Vagneron, L, Verdier, M, Walker, R, Wikus, P, Yakushev, E, Yellin, S, Yoo, J, Young, B, Zhang, J, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Souterrain de Modane (LSM - UMR 6417), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Rayonnement Matière de Saclay (IRAMIS), EDELWEISS, Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

Subjects
Nuclear and High Energy Physics, Particle physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Dark Matter, bolometers, germanium detectors, Dark matter, Massive particle, FOS: Physical sciences, Elementary particle, Astrophysics::Cosmology and Extragalactic Astrophysics, EDELWEISS, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), WIMP, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Physics, 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, Fermion, Baryon, Weakly interacting massive particles, High Energy Physics::Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics
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., Events, efficiencies, and main limit are available in text format (see README.txt)

Published
2011

24. Low-threshold analysis of CDMS shallow-site data

Author

Donald J. Holmgren, C. L. Chang, S. Kamat, T. A. Shutt, David Moore, Tarek Saab, Jodi Cooley, Laura Baudis, M. J. Attisha, R. M. Clarke, Sunil Golwala, X. Qiu, R. Mahapatra, D. N. Seitz, H. N. Nelson, M. B. Crisler, D. S. Akerib, F. DeJongh, Jeffrey P. Filippini, N. Mirabolfathi, L. Hsu, Alexander Bolozdynya, P. L. Brink, David O. Caldwell, R. L. Dixon, Bernard Sadoulet, Vuk Mandic, R. W. Schnee, G. Wang, D. D. Driscoll, R. Bunker, S. J. Yellin, S. W. Nam, P. Cushman, S. Funkhouser, Blas Cabrera, D. A. Bauer, A. Reisetter, J. Sander, W. Rau, J. Yoo, Betty A. Young, P. Meunier, R. W. Ogburn, R. J. Gaitskell, C. Savage, and Martin E. Huber

Subjects
Nuclear and High Energy Physics, Particle physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics::Instrumentation and Detectors, Dark matter, FOS: Physical sciences, chemistry.chemical_element, Germanium, Parameter space, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), WIMP, 0103 physical sciences, 010306 general physics, Physics, 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, chemistry, Weakly interacting massive particles, High Energy Physics::Experiment, Cryogenic Dark Matter Search, Halo, Energy (signal processing), Astrophysics - Cosmology and Nongalactic Astrophysics
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., 18 pages, 12 figures, 5 tables

Published
2010

25. Dark Matter Search Results from the CDMS II Experiment

Author

S. Arrenberg, Enectali Figueroa-Feliciano, S. A. Hertel, R. Bunker, Jie Zhang, M. R. Dragowsky, W. Rau, P. L. Brink, R. Mahapatra, M. Pyle, David Moore, L. Hsu, David O. Caldwell, N. Mirabolfathi, A. Phipps, D. N. Seitz, X. Oiu, M. Kos, Sunil Golwala, Jeffrey P. Filippini, R. W. Ogburn, Bernard Sadoulet, Blas Cabrera, D. Balakishiyeva, F. DeJongh, D. S. Akerib, Z. Ahmed, L. Duong, Donald J. Holmgren, O. Kamaev, Martin E. Huber, P. Wikus, Jodi Cooley, T. Bruch, Miguel Daal, J. Hall, D. A. Bauer, E. J. Ramberg, R. W. Schnee, R. Hennings-Yeomans, Steven W. Leman, J. Yoo, Betty A. Young, P. Cushman, B. Serfass, M. Tarka, Kevin A. McCarthy, Darren Grant, A. Resetter, K. M. Sundqvist, Matthew Fritts, Vuk Mandic, Laura Baudis, C. N. Bailey, J. Sander, H. N. Nelson, M. Kiveni, Tarek Saab, S. Fallows, and S. J. Yellin

Subjects
Elastic scattering, Physics, Particle physics, Multidisciplinary, Large Underground Xenon experiment, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Signal region, Dark matter, Massive particle, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Parameter space, 01 natural sciences, WIMP, 0103 physical sciences, High Energy Physics::Experiment, Cryogenic Dark Matter Search, 010306 general physics
Abstract

News from the Dark Side? Dark matter is thought to represent 85% of all matter in the universe and to have been responsible for the formation of structure in the early universe, but its nature is still a mystery. Ahmed et al. (p. 1619 , published online 11 February; see the Perspective by Lang ) describe the results from the completed Cryogenic Dark Matter Search (CDMS II) experiment, which searched for dark matter in the form of weakly interacting massive particles (WIMP). Two candidate signals were observed, whereas only one background event was expected. The probability of having two or more events from the background would have been 23%. The results of this analysis cannot be interpreted with confidence as evidence for WIMP interactions, but, at the same time, neither event can be ruled out as representing signal.

Published
2010

26. Analysis of the low-energy electron-recoil spectrum of the CDMS experiment

Author

J. Hall, P. L. Brink, Betty A. Young, Steven W. Leman, K. M. Sundqvist, P. Cushman, H. N. Nelson, J. Yoo, M. R. Dragowsky, Sunil Golwala, C. N. Bailey, Donald J. Holmgren, D. S. Akerib, Z. Ahmed, W. Rau, R. Bunker, E. J. Ramberg, D. O. Caldwell, N. Mirabolfathi, R. W. Schnee, D. A. Bauer, Laura Baudis, M. Kiveni, S. A. Hertel, S. Arrenberg, G. Wang, Blas Cabrera, M. Kos, T. Bruch, Bruno Serfass, Enectali Figueroa-Feliciano, Kevin A. McCarthy, Jeffrey P. Filippini, R. Mahapatra, D. Balakishiyeva, Matthew Fritts, Vuk Mandic, Bernard Sadoulet, O. Kamaev, R. Hennings-Yeomans, L. Duong, Darren Grant, Martin E. Huber, X. Qiu, J. Sander, David Moore, F. DeJongh, Tarek Saab, J. Beaty, Jodi Cooley, D. N. Seitz, S. J. Yellin, P. Wikus, A. Reisetter, M. Pyle, L. Hsu, and R. W. Ogburn

Subjects
Nuclear and High Energy Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), astro-ph.GA, Dark matter, FOS: Physical sciences, Elementary particle, 01 natural sciences, Atomic, Particle detector, Nuclear physics, Recoil, Particle and Plasma Physics, Affordable and Clean Energy, 0103 physical sciences, Nuclear, 010306 general physics, Physics, Range (particle radiation), Quantum Physics, 010308 nuclear & particles physics, Molecular, Fermion, Nuclear & Particles Physics, Astrophysics - Astrophysics of Galaxies, 3. Good health, Amplitude, Astrophysics of Galaxies (astro-ph.GA), astro-ph.CO, Astronomical and Space Sciences, Lepton, Astrophysics - Cosmology and Nongalactic Astrophysics
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

Published
2009

27. Search for axions with the CDMS experiment

Author

R. Bunker, J. Hall, A. Reisetter, P. L. Brink, W. Rau, F. DeJongh, Donald J. Holmgren, D. Balakishiyeva, Bernard Sadoulet, M. Pyle, M. R. Dragowsky, L. Hsu, S. A. Hertel, J. Yoo, Jeffrey P. Filippini, David Moore, D. O. Caldwell, D. N. Seitz, S. Arrenberg, L. Duong, Martin E. Huber, Tarek Saab, X. Qiu, N. Mirabolfathi, R. W. Ogburn, Jodi Cooley, Sunil Golwala, E. J. Ramberg, J. Sander, Betty A. Young, D. S. Akerib, Z. Ahmed, R. Mahapatra, K. M. Sundqvist, M. Kos, H. N. Nelson, S. J. Yellin, Kevin A. McCarthy, C. N. Bailey, Enectali Figueroa-Feliciano, O. Kamaev, R. Hennings-Yeomans, Darren Grant, G. Wang, T. Bruch, Bruno Serfass, R. W. Schnee, Blas Cabrera, Steven W. Leman, P. Cushman, Laura Baudis, M. Kiveni, J. Beaty, Matthew Fritts, Vuk Mandic, D. A. Bauer, and M. Tarka

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, High Energy Physics::Phenomenology, FOS: Physical sciences, General Physics and Astronomy, Elementary particle, Fermion, 7. Clean energy, 01 natural sciences, Galaxy, High Energy Physics - Experiment, Massless particle, High Energy Physics - Experiment (hep-ex), High Energy Physics::Theory, 0103 physical sciences, High Energy Physics::Experiment, Cryogenic Dark Matter Search, 010306 general physics, Axion, Lepton
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 $g_{a\gamma\gamma}$ of 2.4$ \times 10^{-9}$ GeV$^{-1}$ at the 95% confidence level for an axion mass less than 0.1 keV/c$^2$. 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 axio-electric coupling $g_{a\bar{e}e}$ of 1.4$ \times 10^{-12}$ at the 90 % confidence level for an axion mass of 2.5 keV/c$^2$. This analysis excludes an interpretation of the DAMA annual modulation result in terms of Galactic axion interactions for axion masses above 1.4 keV/c$^2$., Comment: 5 pages, 5 figures

Published
2009

28. Search for weakly interacting massive particles with the first five-tower data from the cryogenic dark matter search at the soudan underground laboratory

Author

Z. Ahmed, F. DeJongh, S. Arrenberg, R. W. Ogburn, K. M. Sundqvist, D. A. Bauer, J. Beaty, B. Serfass, S. A. Hertel, Bernard Sadoulet, Blas Cabrera, Tarek Saab, Jodi Cooley, R. Bunker, M. Pyle, J. Sander, J. Hall, M. Tarka, X. Qiu, T. Bruch, D. N. Seitz, A. Reisetter, Betty A. Young, Adam Sirois, W. Rau, C. N. Bailey, Darren Grant, L. Novak, N. Mirabolfathi, Jeffrey P. Filippini, M. R. Dragowsky, Astrid Tomada, L. Duong, R. Mahapatra, Matthew Fritts, R. J. Gaitskell, P. L. Brink, Martin E. Huber, Vuk Mandic, David O. Caldwell, R. Hennings-Yeomans, Donald J. Holmgren, S. J. Yellin, J. Yoo, Kevin A. McCarthy, E. J. Ramberg, Enectali Figueroa-Feliciano, R. Schmitt, Sunil Golwala, D. S. Akerib, P. Cushman, S. Burke, R. W. Schnee, Laura Baudis, J. Emes, H. N. Nelson, M. J. Attisha, and G. Wang

Subjects
Physics, Particle physics, DAMA/LIBRA, 010308 nuclear & particles physics, Dark matter, Massive particle, General Physics and Astronomy, Supersymmetry, 01 natural sciences, Nuclear physics, WIMP, Weakly interacting massive particles, 0103 physical sciences, Cryogenic Dark Matter Search, 010306 general physics, Light dark matter
Abstract

We report results from the Cryogenic Dark Matter Search at the Soudan Underground Laboratory (CDMS II) featuring the full complement of 30 detectors. A blind analysis of data taken between October 2006 and July 2007 sets an upper limit on the weakly interacting massive particle (WIMP) nucleon spin-independent cross section of 6.6x10;{-44} cm;{2} (4.6x10;{-44} cm;{2} when combined with previous CDMS II data) at the 90% confidence level for a WIMP mass of 60 GeV/c;{2}. This achieves the best sensitivity for dark matter WIMPs with masses above 44 GeV/c;{2}, and significantly restricts the parameter space for some favored supersymmetric models.

Published
2008

29. 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

30. 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

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