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KM

K. M. Yocum

Goddard Space Flight Center

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J. Colaresi

Mirion Technologies (United States)

P. A. Gerakines

Goddard Space Flight Center

Stefanie N. Milam

Goddard Space Flight Center

Susanna L. Widicus Weaver

University of Wisconsin–Madison

J. I. Collar

University of Chicago

T. W. Hossbach

Pacific Northwest National Laboratory

J. L. Orrell

Pacific Northwest National Laboratory

H.S. Miley

Pacific Northwest National Laboratory

C.E. Aalseth

Pacific Northwest National Laboratory

J. Fast

Pacific Northwest National Laboratory

Cooperative Institutions

Pacific Northwest National Laboratory

Goddard Space Flight Center

University of Chicago

Fermi National Accelerator Laboratory

Battelle

University of Washington

Toyota Industries (United States)

Triangle Universities Nuclear Laboratory

Office of Scientific and Technical Information

Oak Ridge National Laboratory

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Millimeter/submillimeter spectroscopic analysis of desorbed interstellar and planetary/cometary ice analogs

K. M. Yocum Ethan Todd Christopher Schwaiger P. A. Gerakines Stefanie N. Milam

Submillimeter wave

Submillimeter Array

10.1021/scimeetings.0c05495

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First results from a search for coherent elastic neutrino-nucleus scattering at a reactor site

Physical review. D/Physical review. D. (2021)

J. Colaresi J. I. Collar T. W. Hossbach A. Kavner C. M. Lewis

The deployment of a low-noise 3 kg p-type point contact germanium detector at the Dresden-II power reactor, 8 meters from its 2.96 GW$_{th}$ core, is described. This location provides an unprecedented (anti)neutrino flux of 8.1$\times 10^{13} ~\bar{\nu_{e}}/$cm$^{2}$s. When combined with the 0.2 keV$_{ee}$ detector threshold achieved, a first measurement of CE$\nu$NS from a reactor source appears to be within reach. We report on the characterization and abatement of backgrounds during initial runs, deriving improved limits on extensions of the Standard Model involving a light vector mediator, from preliminary data.

10.1103/physrevd.104.072003

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Citations (35)

Erratum: Experimental Constraints on a Dark Matter Origin for the DAMA Annual Modulation Effect [Phys. Rev. Lett.PRLTAO0031-9007101, 251301 (2008)]

Physical Review Letters (2009)

C.E. Aalseth P. S. Barbeau D. G. Cerdeño J. Colaresi J. I. Collar

Received 24 February 2009DOI:https://doi.org/10.1103/PhysRevLett.102.109903©2009 American Physical Society

Modulation (music)

10.1103/physrevlett.102.109903

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Improving Germanium Detector Resolution and Reliability

Gregory N. Martin K. M. Yocum J. Colaresi H.S. Miley

High purity germanium (HPGe) detectors used in radionuclide assay systems such as Radionuclide Aerosol Sampler/Analyzer (RASA) systems must operate unattended for long periods of time. Currently, the performance and reliability of commercially available large (~100%) HPGe detectors are acceptable for the majority of laboratory applications. However, for remote systems designed for nuclear detonation detection and analysis, improved performance and reliability are required. The goals of this research include improving germanium detector reliability and resolution performance by developing new surface passivation techniques coupled with a unique detector contact arrangement. A major reliability improvement would be realized if germanium detectors were made less sensitive to storage and operational environments by improving the film coating used to passivate and protect the intercontact surface. This research is the investigation of two surface film techniques for passivating HPGe detector surfaces. Wet chemically grown oxide films and sputtered film coatings will in turn be applied to two standard P-type HPGe coaxial detectors. Each coating will be characterized to determine their surface chemistry passivating qualities as well as their inherent noise contribution to the overall system noise. The resolution of a germanium detector is a function of electrical noise and the inherent resolution of the detector element. The electrical noise components which reduce the signal to noise ratio of a detector system are associated with detector leakage current, intercontact surface noise, contact noise and noise sources associated with preamplifier electronics. In particular, those noise components associated with the intercontact surface are leakage current and surface noise. We believe these two significant sources of noise can be reduced by using novel surface passivation techniques resulting in improved detector resolution. The techniques developed by this research will be applicable to new detectors and can also be applied as a retrofit to existing RASA units. This will improve the ability to obtain more sensitive and reliable detections of remote nuclear activity.

Semiconductor detector

Passivation

Preamplifier

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Results from a Search for Light-Mass Dark Matter with ap-Type Point Contact Germanium Detector

Physical Review Letters (2011)

C.E. Aalseth P. S. Barbeau N. S. Bowden Belkis Cabrera-Palmer J. Colaresi

We report on several features in the energy spectrum from an ultralow-noise germanium detector operated deep underground. By implementing a new technique able to reject surface events, a number of cosmogenic peaks can be observed for the first time. We discuss an irreducible excess of bulklike events below 3 keV in ionization energy. These could be caused by unknown backgrounds, but also dark matter interactions consistent with DAMA/LIBRA. It is not yet possible to determine their origin. Improved constraints are placed on a cosmological origin for the DAMA/LIBRA effect.

10.1103/physrevlett.106.131301

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Citations (790)

CoGeNT: A search for low-mass dark matter usingp-type point contact germanium detectors

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology (2013)

C.E. Aalseth P. S. Barbeau J. Colaresi J. I. Collar J. Leon

CoGeNT employs p-type point-contact (PPC) germanium detectors to search for Weakly Interacting Massive Particles (WIMPs). By virtue of its low energy threshold and ability to reject surface backgrounds, this type of device allows an emphasis on low-mass dark matter candidates (wimp mass of about 10 GeV/c2). We report on the characteristics of the PPC detector presently taking data at the Soudan Underground Laboratory, elaborating on aspects of shielding, data acquisition, instrumental stability, data analysis, and background estimation. A detailed background model is used to investigate the low energy excess of events previously reported, and to assess the possibility of temporal modulations in the low-energy event rate. Extensive simulations of all presently known backgrounds do not provide a viable background explanation for the excess of low-energy events in the CoGeNT data, or the previously observed temporal variation in the event rate. Also reported on for the first time is a determination of the surface (slow pulse rise time) event contamination in the data as a function of energy. We conclude that the CoGeNT detector technology is well suited to search for the annual modulation signature expected from dark matter particle interactions in the region of WIMP mass and coupling favored by the DAMA/LIBRA results

WIMP

10.1103/physrevd.88.012002

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Citations (380)

Millimeter/Submillimeter Spectroscopic Detection of Desorbed Ices: A New Technique in Laboratory Astrochemistry

The Journal of Physical Chemistry A (2019)

K. M. Yocum Houston Smith Ethan Todd Leslie Mora P. A. Gerakines

A new laboratory technique has been developed that utilizes gas-phase, direct-absorption millimeter and submillimeter spectroscopy to detect and identify desorbed species from interstellar and cometary ice analogues. Rotational spectroscopy is a powerful structure-specific technique for detecting isomers and other species possessing the same mass that are indistinguishable with mass spectrometry. Furthermore, the resultant laboratory spectra are directly comparable to observational data from far-infrared and millimeter telescopes. Here, we present the proof-of-concept measurements of the detection of thermally desorbed H2O, D2O, and CH3OH originating in a solid film created at low temperature (∼12 K). The surface binding energy of H2O is reported and compared to results from traditional techniques, including mass spectrometry and quartz-crystal microbalance measurements of mass loss. Lastly, we demonstrate that this technique can be used to derive thermodynamic values including the sublimation enthalpy and entropy of H2O.

Sublimation

10.1021/acs.jpca.9b04587

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Citations (23)

Improved gamma-spectroscopy of marine samples via low background small anode germanium well detector with cosmic veto suppression

Journal of Radioanalytical and Nuclear Chemistry (2015)

S. M. Pike A. S. Adekola J. Colaresi Gabriela Ilie W.F. Mueller

Veto

Semiconductor detector

10.1007/s10967-015-4522-6

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The C-4 dark matter experiment

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2013)

Ricco Bonicalzi J. I. Collar J. Colaresi J.E. Fast N.E. Fields

Semiconductor detector

10.1016/j.nima.2013.02.012

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ROTATIONAL SPECTROSCOPY AS A TOOL FOR STRUCTURE-SPECIFIC IDENTIFICATION OF PRODUCTS OF UV-PHOTOLYZED COSMIC ICE ANALOGUES

Proceedings of the 2022 International Symposium on Molecular Spectroscopy (2022)

Olivia Wilkins Susanna L. Widicus Weaver G. A. Cruz-Díaz Will Thompson P. A. Gerakines

Identification

10.15278/isms.2022.fg01

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