Bulletin of the American Physical Society
2010 Annual Meeting of the California-Nevada Section of the APS
Volume 55, Number 12
Friday–Saturday, October 29–30, 2010; Pasadena, California
Session D3: Nuclear, High Energy and Accelerator Physics II |
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Chair: Howard Matis, Lawrence Berkeley National Laboratory Room: Building 17 - Cahill Center for Astronomy and Astrophysics, Hameetman Auditorium |
Friday, October 29, 2010 4:00PM - 4:12PM |
D3.00001: Front end electronics for the Majorana Demonstrator James Loach The Majorana experiment will use an array of p-type point contact Ge detectors to search for neutrinoless double beta decay in 76Ge. The low capacitance of point contact detectors allows low noise performance and therefore low detection thresholds. Realizing these in practice requires low noise electronics and front end boards positioned close to the detectors. The low background requirements of Majorana mean that the front end electronics must be extremely radio-pure. This talk describes a front end board developed at LBNL, focusing on the choice of materials and techniques used to verify the radio-purity. [Preview Abstract] |
Friday, October 29, 2010 4:12PM - 4:24PM |
D3.00002: CUORE and CUORE-0: Searching For Neutrinoless Double Beta Decay in $^{130}$Te Ivo Plamenac, Samuel Meijer CUORE (Cryogenic Underground Observatory for Rare Events) is one of the leading experiments in the search for neutrinoless double beta decay; a type of decay which has yet to be witnessed in nature. If such a decay exists, CUORE intends to find it using an innovative source equals detector apparatus with TeO$_2$ crystals that are abundant in $^{130}$Te. If CUORE is to detect such an event, it would provide evidence that the neutrino is its own antiparticle. Such results would require a revision in the Standard Model. Over the Summer of 2010, Cal Poly undergraduates travelled to the Gran Sasso National Laboratory in Assergi, Italy to assist in PTFE couplings cleaning, as well as assist in other various tasks to help progress CUORE-0, an initial run of one of the CUORE TeO$_2$ towers. An overview of neutrinoless double beta decay and the CUORE experiment as well as a brief progress report of CUORE-0 will be presented. This work was fully supported by NSF PHY-0969852. [Preview Abstract] |
Friday, October 29, 2010 4:24PM - 4:36PM |
D3.00003: Neutrino Physics with IceCube Mariola Lesiak-Bzdak Detection of ultra-high-energy neutrinos will help us to identify the origins of the highest energy cosmic rays. The discovery of neutrinos from these distant sources should be possible with a cubic-kilometer detector: IceCube is the largest neutrino telescope in the world. It is currently taking data at the South Pole. IceCube currently consists of 79 strings housing nearly 5000 Digital Optical Modules at the depths from 1.45 to 2.45 km below the surface. Construction will finish in early 2011 bringing the total number of strings to 86. Utilizing the transparent ice of Antarctica as a detection medium, IceCube observes Cherenkov radiation from secondary particles produced in neutrino interactions inside or near the detector. IceCube is sensitive to all neutrino flavors over a wide range of energies, from below 100 GeV to beyond 10$^{9}$ GeV. Data from the partially completed IceCube has been searched for point-like and diffuse fluxes of astrophysical neutrinos. After reviewing the detection technique and performance of the IceCube neutrino telescope, we will discuss the current status of the IceCube experiment, highlighting some of the recent results. [Preview Abstract] |
Friday, October 29, 2010 4:36PM - 4:48PM |
D3.00004: A Study of Systematic Errors In a Search for Neutron Oscillation (At Super-K) Kevin Banuelos The study holds responsibilities in comparing the uncertainties in the detection efficiency, exposure, and background rates. The major sources of errors are in the propagation of particles through the residual nucleus. I will discuss my duties of working within the Monte Carlo program (a Simulator), sharing data in a spreadsheet format to show conflicting error results. [Preview Abstract] |
Friday, October 29, 2010 4:48PM - 5:00PM |
D3.00005: The Axion Dark Matter eXperiment (ADMX) - Status and Future Plans Karl van Bibber The axion is a well-motivated light elementary particle, and is also a compelling dark matter candidate. Although extremely feebly interacting, axions constituting our galactic dark matter halo could be detected by their resonant conversion to monochromatic photons in a microwave cavity permeated by a magnetic field. The cavity is kept at near-zero temperature to reduce blackbody photons, and the signal detected by an ultralow noise microwave amplifier. Resonant conversion occurs when the the cavity frequency equals the axion mass, thus the search requires tuning the cavity in small steps and integrating for sufficient time at each frequency to achieve the desired signal-to-noise. ADMX has been conducting such a search for several years, and has set strong limits on axionic dark matter in the micro-eV range. The experiment has recently been upgraded to use amplifiers based on SQUIDs (Superconducting QUantum Interference Device) whose noise is near-quantum limited. ADMX will now be upgraded with the addition of a dilution refrigerator to further reduce the system noise. Additionally, the construction of a second, smaller experiment ADMX-HF (High Frequency) has been proposed to search for axions in the 10 micro-eV range. [Preview Abstract] |
Friday, October 29, 2010 5:00PM - 5:12PM |
D3.00006: Measurement of Single Target-Spin Asymmetry in Semi-Inclusive Pion Electroproduction on a Transversely Polarized $^3$He Target Xin Qian Measuring parton distribution functions (PDF) which represent the flavor and spin structure of nucleon is important to reveal the information of quantum chromodynamics in the confinement region. In particular, in parton model, the cross-section in the semi-inclusive deep inelastic scattering (SIDIS), can be written as the product of PDF and fragmentation function which describe the parton hadronized process due to color force. The JLab experiment E06-010 is focusing on measuring the target single spin asymmetry in the semi-inclusive deep inelastic $\overrightarrow{^{3}\rm He}(e,e'\pi^{+,-})X$ reaction with a transversely polarized $^3\rm He$ target at JLab Hall A with a 5.89 GeV electron beam. The leading pions and scattered electrons were detected in coincidence by the left High-Resolution Spectrometers ($HRS_L$) at $16^{\circ}$ and BigBite spectrometer at $30^{\circ}$, respectively. Kinematic coverage was focused on the valence quark region, x $\sim$0.1-0.4, at $Q^2$ $\sim$ 1-3 (GeV/c)$^2$. The Collins and Sivers asymmetries of $^3\rm He$ and neutron were extracted. The overview of the experiment and the preliminary results will be presented. [Preview Abstract] |
Friday, October 29, 2010 5:12PM - 5:24PM |
D3.00007: Projected Hartree-Fock in a shell-model basis Joshua Staker, Calvin Johnson We implement projected Hartree-Fock in a shell model basis and compare against exact numerical results from full space diagonalization. We consider the accuracy of projected Hartree-Fock for the excited state spectrum in the cases of the $s-d$ and $p-f$ fixed parity shells as well as cases of mixed parity in the $p-sd$ shell. The accuracy of valence proton-neutron number configurations are also considered including even-even, odd-odd, and odd-A. [Preview Abstract] |
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