N. Fields - The. MAJORANA. Collaboration

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N. Fields
The. MAJORANA. Collaboration

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Nuclear Experiment (13)
High Energy Physics - Experiment (10)
Physics - Instrumentation and Detectors (9)
Cosmology and Nongalactic Astrophysics (6)
High Energy Physics - Phenomenology (5)
High Energy Astrophysical Phenomena (1)
Instrumentation and Methods for Astrophysics (1)

Publications Authored By N. Fields

The COHERENT collaboration's primary objective is to measure coherent elastic neutrino-nucleus scattering (CEvNS) using the unique, high-quality source of tens-of-MeV neutrinos provided by the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). In spite of its large cross section, the CEvNS process has never been observed, due to tiny energies of the resulting nuclear recoils which are out of reach for standard neutrino detectors. The measurement of CEvNS has now become feasible, thanks to the development of ultra-sensitive technology for rare decay and weakly-interacting massive particle (dark matter) searches. Read More

We study the possibility of using CsI[Na] scintillators as an advantageous target for the detection of coherent elastic neutrino-nucleus scattering (CENNS), using the neutrino emissions from the SNS spallation source at Oak Ridge National Laboratory. The response of this material to low-energy nuclear recoils like those expected from this process is characterized. Backgrounds are studied using a 2 kg low-background prototype crystal in a dedicated radiation shield. Read More

Weakly Interacting Massive Particles (WIMPs) are well-established dark matter candidates. WIMP interactions with sensitive detectors are expected to display a characteristic annual modulation in rate. We release a dataset spanning 3. Read More

The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, Tennessee, provides an intense flux of neutrinos in the few tens-of-MeV range, with a sharply-pulsed timing structure that is beneficial for background rejection. In this white paper, we describe how the SNS source can be used for a measurement of coherent elastic neutrino-nucleus scattering (CENNS), and the physics reach of different phases of such an experimental program (CSI: Coherent Scattering Investigations at the SNS). Read More

We describe the experimental design of C-4, an expansion of the CoGeNT dark matter search to four identical detectors each approximately three times the mass of the p-type point contact germanium diode presently taking data at the Soudan Underground Laboratory. Expected reductions of radioactive backgrounds and energy threshold are discussed, including an estimate of the additional sensitivity to low-mass dark matter candidates to be obtained with this search. Read More

Affiliations: 1The. MAJORANA. Collaboration, 2The. MAJORANA. Collaboration, 3The. MAJORANA. Collaboration, 4The. MAJORANA. Collaboration, 5The. MAJORANA. Collaboration, 6The. MAJORANA. Collaboration, 7The. MAJORANA. Collaboration, 8The. MAJORANA. Collaboration, 9The. MAJORANA. Collaboration, 10The. MAJORANA. Collaboration, 11The. MAJORANA. Collaboration, 12The. MAJORANA. Collaboration, 13The. MAJORANA. Collaboration, 14The. MAJORANA. Collaboration, 15The. MAJORANA. Collaboration, 16The. MAJORANA. Collaboration, 17The. MAJORANA. Collaboration, 18The. MAJORANA. Collaboration, 19The. MAJORANA. Collaboration, 20The. MAJORANA. Collaboration, 21The. MAJORANA. Collaboration, 22The. MAJORANA. Collaboration, 23The. MAJORANA. Collaboration, 24The. MAJORANA. Collaboration, 25The. MAJORANA. Collaboration, 26The. MAJORANA. Collaboration, 27The. MAJORANA. Collaboration, 28The. MAJORANA. Collaboration, 29The. MAJORANA. Collaboration, 30The. MAJORANA. Collaboration, 31The. MAJORANA. Collaboration, 32The. MAJORANA. Collaboration, 33The. MAJORANA. Collaboration, 34The. MAJORANA. Collaboration, 35The. MAJORANA. Collaboration, 36The. MAJORANA. Collaboration, 37The. MAJORANA. Collaboration, 38The. MAJORANA. Collaboration, 39The. MAJORANA. Collaboration, 40The. MAJORANA. Collaboration, 41The. MAJORANA. Collaboration, 42The. MAJORANA. Collaboration, 43The. MAJORANA. Collaboration, 44The. MAJORANA. Collaboration, 45The. MAJORANA. Collaboration, 46The. MAJORANA. Collaboration, 47The. MAJORANA. Collaboration, 48The. MAJORANA. Collaboration, 49The. MAJORANA. Collaboration, 50The. MAJORANA. Collaboration, 51The. MAJORANA. Collaboration, 52The. MAJORANA. Collaboration, 53The. MAJORANA. Collaboration, 54The. MAJORANA. Collaboration, 55The. MAJORANA. Collaboration, 56The. MAJORANA. Collaboration, 57The. MAJORANA. Collaboration, 58The. MAJORANA. Collaboration, 59The. MAJORANA. Collaboration, 60The. MAJORANA. Collaboration, 61The. MAJORANA. Collaboration, 62The. MAJORANA. Collaboration, 63The. MAJORANA. Collaboration, 64The. MAJORANA. Collaboration, 65The. MAJORANA. Collaboration, 66The. MAJORANA. Collaboration, 67The. MAJORANA. Collaboration, 68The. MAJORANA. Collaboration, 69The. MAJORANA. Collaboration, 70The. MAJORANA. Collaboration, 71The. MAJORANA. Collaboration, 72The. MAJORANA. Collaboration, 73The. MAJORANA. Collaboration, 74The. MAJORANA. Collaboration, 75The. MAJORANA. Collaboration, 76The. MAJORANA. Collaboration, 77The. MAJORANA. Collaboration, 78The. MAJORANA. Collaboration, 79The. MAJORANA. Collaboration, 80The. MAJORANA. Collaboration, 81The. MAJORANA. Collaboration, 82The. MAJORANA. Collaboration, 83The. MAJORANA. Collaboration

The MAJORANA DEMONSTRATOR will search for the neutrinoless double-beta decay of the 76Ge isotope with a mixed array of enriched and natural germanium detectors. The observation of this rare decay would indicate the neutrino is its own anti-particle, demonstrate that lepton number is not conserved, and provide information on the absolute mass-scale of the neutrino. The DEMONSTRATOR is being assembled at the 4850 foot level of the Sanford Underground Research Facility in Lead, South Dakota. Read More

We measured the production of the long-lived nuclides Bi-207, Pb-202, and Hg-194 in a sample of natural Pb due to high-energy neutron interactions using a neutron beam at the Los Alamos Neutron Science Center. The activated sample was counted by a HPGe detector to measure the amount of radioactive nuclides present. These nuclides are critical in understanding potential backgrounds in low background experiments utilizing large amounts of Pb shielding due to cosmogenic neutron interactions in the Pb while residing on the Earth's surface. Read More

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. Read More

A study of signals originating near the lithium-diffused n+ contact of p-type point contact (PPC) high purity germanium detectors (HPGe) is presented. The transition region between the active germanium and the fully dead layer of the n+ contact is examined. Energy depositions in this transition region are shown to result in partial charge collection. Read More

The observation of neutrinoless double-beta decay would resolve the Majorana nature of the neutrino and could provide information on the absolute scale of the neutrino mass. The initial phase of the Majorana experiment, known as the Demonstrator, will house 40 kg of Ge in an ultra-low background shielded environment at the 4850' level of the Sanford Underground Laboratory in Lead, SD. The objective of the Demonstrator is to determine whether a future 1-tonne experiment can achieve a background goal of one count per tonne-year in a narrow region of interest around the 76Ge neutrinoless double-beta decay peak. Read More

A brief review of the history and neutrino physics of double beta decay is given. A description of the MAJORANA DEMONSTRATOR research and development program including background reduction techniques is presented in some detail. The application of point contact (PC) detectors to the experiment is discussed, including the effectiveness of pulse shape analysis. Read More

Neutrinoless double-beta decay experiments can potentially determine the Majorana or Dirac nature of the neutrino, and aid in understanding the neutrino absolute mass scale and hierarchy. Future 76Ge-based searches target a half-life sensitivity of >10^27 y to explore the inverted neutrino mass hierarchy. Reaching this sensitivity will require a background rate of <1 count tonne^-1 y^-1 in a 4-keV-wide spectral region of interest surrounding the Q value of the decay. Read More

The observation of neutrinoless double-beta decay would determine whether the neutrino is a Majorana particle and provide information on the absolute scale of neutrino mass. The MAJORANA Collaboration is constructing the DEMONSTRATOR, an array of germanium detectors, to search for neutrinoless double-beta decay of 76-Ge. The DEMONSTRATOR will contain 40 kg of germanium; up to 30 kg will be enriched to 86% in 76-Ge. Read More

Fifteen months of cumulative CoGeNT data are examined for indications of an annual modulation, a predicted signature of Weakly Interacting Massive Particle (WIMP) interactions. Presently available data support the presence of a modulated component of unknown origin, with parameters prima facie compatible with a galactic halo composed of light-mass WIMPs. Unoptimized estimators yield a statistical significance for a modulation of ~2. Read More

The MAJORANA Collaboration is building the MAJORANA DEMONSTRATOR, a 60 kg array of high purity germanium detectors housed in an ultra-low background shield at the Sanford Underground Laboratory in Lead, SD. The MAJORANA DEMONSTRATOR will search for neutrinoless double-beta decay of 76Ge while demonstrating the feasibility of a tonne-scale experiment. It may also carry out a dark matter search in the 1-10 GeV/c^2 mass range. Read More

Affiliations: 1CoGeNT collaboration, 2CoGeNT collaboration, 3CoGeNT collaboration, 4CoGeNT collaboration, 5CoGeNT collaboration, 6CoGeNT collaboration, 7CoGeNT collaboration, 8CoGeNT collaboration, 9CoGeNT collaboration, 10CoGeNT collaboration, 11CoGeNT collaboration, 12CoGeNT collaboration, 13CoGeNT collaboration, 14CoGeNT collaboration, 15CoGeNT collaboration, 16CoGeNT collaboration, 17CoGeNT collaboration, 18CoGeNT collaboration, 19CoGeNT collaboration, 20CoGeNT collaboration, 21CoGeNT collaboration, 22CoGeNT collaboration, 23CoGeNT collaboration, 24CoGeNT collaboration, 25CoGeNT collaboration, 26CoGeNT collaboration, 27CoGeNT collaboration

We report on several features present in the energy spectrum from an ultra low-noise germanium detector operated at 2,100 m.w.e. Read More

Since September 2005, the Whipple 10m Gamma-ray Telescope has been operated primarily as a blazar monitor. The five Northern Hemisphere blazars that have already been detected at the Whipple Observatory, Markarian 421, H1426+428, Markarian 501, 1ES 1959+650 and 1ES 2344+514, are monitored routinely each night that they are visible. We report on the Markarian 421 observations taken from November 2005 to June 2006 in the gamma-ray, X-ray, optical and radio bands. Read More