Bulletin of the American Physical Society
2008 Annual Meeting of the Division of Nuclear Physics
Volume 53, Number 12
Thursday–Sunday, October 23–26, 2008; Oakland, California
Session EC: Mini-Symposium: Neutrino Properties and Nuclear Physics II |
Hide Abstracts |
Chair: John Wilkerson, University of Washington Room: Jewett Ballroom A-B |
Friday, October 24, 2008 4:00PM - 4:12PM |
EC.00001: Perturbative Corrections to the Shell Model Operator for Neutrinoless Double-Beta Decay Jonathan Engel, Gaute Hagen We use many-body perturbation theory to correct the bare double-beta decay operator for configurations that are outside the shell-model space. We sum high-energy ladder diagrams to all orders in the nuclear potential and also evaluate low-energy ladders, core-polarization, and 4-particle 2-hole graphs to first order in the G-matrix. Though the individual graphs can change the bare shell-model matrix element significantly in $^{82}$Se, the sum of all graphs produces only a relatively modest increase. [Preview Abstract] |
Friday, October 24, 2008 4:12PM - 4:24PM |
EC.00002: Status of the EXO-200 double beta decay experiment Derek Mackay The EXO collaboration is presently constructing and commissioning the world's largest search for neutrinoless double beta decay. The centerpiece of this experiment, known as EXO-200, is 200 kilograms of xenon enriched to 80\% in Xenon-136. The xenon is cooled to 170 K, where it liquefies, and is held in a thin copper vessel inside several layers radioactive shielding. Ionizing events in the liquid xenon produce a charge signal which we observe on a segmented anode and a scintillation signal which is collected by array of avalanche photodiodes (APDs). The detector measures the three dimensional event location and the energy of the individual charge deposits, and it can distinguish between multiple-site Compton scattering events and single-site signal candidates. The experiment is located underground at the WIPP facility in Carlsbad, New Mexico, and is currently undergoing final commissioning in preparation for physics data taking. We will present in this talk the current status of our preparations and our expected neutrino mass sensitivity. [Preview Abstract] |
Friday, October 24, 2008 4:24PM - 4:36PM |
EC.00003: CUORE-0: The First CUORE Tower Adam Bryant The CUORE experiment will search for neutrinoless double beta decay of 130Te using TeO2 bolometers arranged in 19 closely packed towers. Before construction of the full CUORE detector, the first CUORE tower, named CUORE-0, is planned to be installed in the cryostat that housed the recently completed CUORICINO experiment. The CUORE-0 experiment will test the detector assembly procedures developed for CUORE. It will also improve on the limit on the neutrinoless double beta decay half-life of 130Te set by CUORICINO. The status of CUORE-0 and expectations for its performance will be presented. [Preview Abstract] |
Friday, October 24, 2008 4:36PM - 4:48PM |
EC.00004: The M\textsc{ajorana} Neutrinoless Double-Beta Decay Experiment James Fast The objective of the M\textsc{ajorana} collaboration is to study neutrinoless double beta decay $\beta \beta $(0$\nu )$ with an effective Majorana neutrino mass sensitivity near 100 meV in order to characterize the Majorana or Dirac nature of the neutrino, the Majorana mass spectrum, and the absolute mass scale. The M\textsc{ajorana} experiment will consist of a large mass of $^{76}$Ge in the form of high-resolution intrinsic germanium detectors located deep underground within a ultra-low-background shielding environment. The experiment will use a phased deployment approach with a final mass target of order 1 tonne. The first phase, the M\textsc{ajorana} D\textsc{emonstrator}, will deploy 60-kg of germanium detectors with the dual goals of demonstrating background levels suitable for a tonne-scale experiment and testing the Klapdor-Kleingrothaus result (Modern Physics Letters A, Vol. 21, No. 20 (2006) 1547-1566). An overview and status update of the M\textsc{ajorana} experiment will be presented in this talk. [Preview Abstract] |
Friday, October 24, 2008 4:48PM - 5:00PM |
EC.00005: Search for the double electron capture and electron capture/$\beta ^{+}$ decay of $^{120}$Te Nicholas Scielzo Te-120 is a rare, naturally-occurring isotope that can undergo double electron capture and electron capture/$\beta ^{+}$ decay with a Q-value of 1700$\pm $10 keV. We have analyzed data from CUORICINO to place the most stringent limits on these decay modes. CUORICINO is an array of 62 bolometers comprised primarily of $^{nat}$TeO$_{2}$ crystals and contains 27 g of $^{120}$Te (natural abundance 0.1{\%}). The search for neutrinoless decay modes is currently complicated by a large uncertainty in the decay Q-value. We will present the status of this analysis and prospects for future improvements that will come from data to be collected with the 1-ton TeO$_{2}$ bolometer array CUORE and a Q-value measurement with sub-keV precision. Lawrence Livermore National Laboratory is operated by Lawrence Livermore National Security, LLC, for the U.S. Department of Energy, National Nuclear Security Administration under Contract DE-AC52-07NA27344. [Preview Abstract] |
Friday, October 24, 2008 5:00PM - 5:12PM |
EC.00006: Electron-capture Branch of $^{100}$Tc Sky Sjue, Alejandro Garcia, Irshad Ahmad, Dan Melconian, Tommi Eronen, Iain Moore, Heikki Penttila, Juha Aysto We present a measurement of the electron-capture branch of $^{100}$Tc performed at the JYFLTRAP facility in Jyv\"askyl\"a, Finland. The electron-capture branch of $^{100}$Tc determines the solar neutrino absorption cross section of $^{100}$Mo and provides an important test of nuclear-structure calculations for double-beta decay. We discuss implications of this result for theoretical double-beta decay rates from $^{100}$Mo to the ground and excited states of $^{100}$Ru. [Preview Abstract] |
Friday, October 24, 2008 5:12PM - 5:24PM |
EC.00007: SNO+ Multipurpose Neutrino Detector Christine Kraus SNO+ proposes to fill the existing SNO detector with liquid scintillator. The unique location in SNOLAB, currently the worlds deepest international underground facility, will enable a variety of physics measurements from further studies of solar neutrinos (pep and CNO), to geo- and reactor neutrinos, to supernova neutrinos to the possibility of studying neutrinoless double beta decay. With the addition of $^{150}$Nd to the liquid scintillator SNO+ is capable of a competitive next-generation search for this rare process. The physics potential and experimental sensitivities will be discussed. [Preview Abstract] |
Friday, October 24, 2008 5:24PM - 5:36PM |
EC.00008: Measuring the low energy solar neutrino spectrum with the LENS experiment Rex Tayloe The Low-Energy Neutrino Spectroscopy (LENS) experiment is designed for a precision measurement in real time of the fluxes of low energy solar neutrinos (pp, $^7$Be, pep, and CNO, comprising $> 99 \% $ of the solar neutrino energy) via charged-current capture on Indium-115 (with threshold of 114~keV). LENS will allow a comparison of the neutrino and photon luminosities of the sun that will test the basic assumptions of solar astrophysics and the overall validity of the MSW-LMA neutrino model. The individual flux results will improve limits on $\theta_{12}$ and the pp spectrum can directly probe the temperature profile of fusion energy production. A detector technology, utilizing a novel optical segmentation method with indium-loaded liquid scintillator has been developed. A modest 1~m$^3$ prototype (miniLENS), in development for installation in the Kimballton Underground Research Facility (KURF), will demonstrate experimental feasibility and will allow for optimization for a 200~ton, full-scale LENS experiment. [Preview Abstract] |
Friday, October 24, 2008 5:36PM - 5:48PM |
EC.00009: The Daya Bay Experiment: Overview and Timeline Dan Dwyer The apparent small size of the neutrino mixing angle $\theta_{13}$ has important implications. The Daya Bay neutrino oscillation experiment has the greatest sensitivity to $\sin^2 2\theta_{13}$ of all experiments currently under construction. Our goal is to either determine the size of this mixing angle, or to establish a limit of $\sin^2 2\theta_{13}<0.01$. Essential aspects include an extremely high power reactor facility, four pairs of ``identical'' detectors to monitor flux near and far from the the reactor cores, strong control of backgrounds, and an aggressive and redundant calibration system. We will describe the main components of the experiment, and present an up-to-date timeline for construction, data taking, and completion. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700