Bulletin of the American Physical Society
2010 Fall Meeting of the APS Division of Nuclear Physics
Volume 55, Number 14
Tuesday–Saturday, November 2–6, 2010; Santa Fe, New Mexico
Session JF: Detector Arrays for Low Energy Reactions |
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Chair: Jolie Cizewski, Rutgers University Room: Kearney |
Friday, November 5, 2010 2:00PM - 2:12PM |
JF.00001: TACTIC: A Detector for Tracking in Low Energy Nuclear Astrophysics K.A. Chipps, P.A. Amaudruz, L. Buchmann, P. Bruskiewich, S.P. Fox, B.R. Fulton, U. Hager, A.M. Laird, P. Machule, L. Martin, R. Openshaw, G. Ruprecht, A.C. Shotter, P. Walden, M. Walter In nuclear astrophysics, detection of low energy reaction products is often difficult with techniques such as silicon detectors. To this end, the TRIUMF Annular Chamber for Tracking and Identification of Charged-particles (TACTIC) detector has been designed and built by an international collaboration between TRIUMF and the University of York. TACTIC is a cylindrical, segmented-anode, active-target TPC which utilizes high-gain preamps, digital electronics, Gas Electron Multiplier (GEM) foils and a He-CO$_2$ gas mixture. First results from a recent radioactive beam test to study $^{8}$Li($\alpha$,n)$^{11}$B will be discussed. [Preview Abstract] |
Friday, November 5, 2010 2:12PM - 2:24PM |
JF.00002: A Low Energy Neutron Detector Array (LENDA) for measuring the (p,n) reaction with rare-isotope beams at intermediate energies Masaki Sasano, Sam M. Austin, D. Bazin, S. Cannon, J.M. Deaven, C.J. Guess, G.W. Hitt, R.T. Meharchand, D.T. Nguyen, G. Perdikakis, A. Prinke, Y. Shimbara, R.G.T. Zegers A Low Energy Neutron Detector Array (LENDA) has been developed for measuring the (p,n) reaction with rare-isotope beams at intermediate energies. This reaction is a powerful probe to study nuclear spin-isospin responses such as Gamow-Teller giant resonance. But, until recently, such study has been restricted to a region of stable nuclei because it is difficult to detect low-energy recoil neutrons of the (p,n) reaction with rare-isotope beams in inverse kinematics. This will be made possible by using LENDA, whose design is optimized for measuring time-of-flight of low-energy neutrons with both of a good efficiency and a high resolution. In this talk, the experimental determination of the efficiency and time and position resolutions of LENDA as well as how to perform (p,n) experiments with LENDA will be presented. [Preview Abstract] |
Friday, November 5, 2010 2:24PM - 2:36PM |
JF.00003: The Array for Nuclear Astrophysics Studies with Exotic Nuclei L.E. Linhardt, J.C. Blackmon, M. Matos, L.L. Mondello, E.F. Zganjar, E. Johnson, G. Rogachev, I. Wiedenhover The Array for Nuclear Astrophysics Studies with Exotic Nuclei (ANASEN) is a charged-particle detector array that is targeted primarily towards reaction studies with radioactive ion beams at FSU and the NSCL. ANASEN consists of 40 double-sided silicon-strip detectors backed with CsI scintillators and an innovative gas counter design that allows operation in a gas target/detector mode and experiments covering a broad range of center-of-mass energies simultaneously. Electronics based on ASIC components are being implemented to achieve a high channel count at low cost. Prototypes of all the detector components have been fabricated and are currently being tested. Performance of the individual components and plans for the first experiments that aim to improve our knowledge of the nuclear reactions important in stellar explosions will be reported. [Preview Abstract] |
Friday, November 5, 2010 2:36PM - 2:48PM |
JF.00004: The TECSA Commissioning Run B.T. Roeder, M. McCleskey, L. Trache, A.A. Alharbi, A. Banu, V.Z. Goldberg, E. Simmons, A. Spiridon, R.E. Tribble, S. Cherubini, M. Gulino, R.G. Pizzone, R. Spart\`a, C. Spitaleri, T. Davinson, J. Wallace, P.J. Woods The Texas A\&M-Edinburgh-Catania Silicon detector Array (TECSA) is a collaborative effort to build a high-efficiency detector Si array useful for measuring reactions of interest for nuclear astrophysics and nuclear structure. The array consists of up to 16 Micron Semiconductor YY1 detectors. Each detector has 16 annular ring sectors to measure the energy and the scattering angle of the detected particles. TECSA was commissioned in a recent experiment at Texas A\&M University which measured the d($^{14}$C,p)$^{15}$C reaction at 11.7 MeV/u. The recoil protons from the reaction were measured with TECSA at backward angles and angular distributions were obtained for the $^{15}$C ground and 0.740 MeV excited state. The protons were measured both as singles events and in coincidence with timing signals from the cyclotron RF and a scintillator before the reaction target. The data are useful for obtaining the ANCs for the $^{15}$C states. Preliminary results of the data analysis from the commissioning run and prospects for the future use of this detector array will be presented. [Preview Abstract] |
Friday, November 5, 2010 2:48PM - 3:00PM |
JF.00005: New CsI(Na) Hodoscope Array For Heavy Ions Krista Meierbachtol, Daniel Bazin, Dave Morrissey A scintillator based hodoscope array was recently constructed at the National Superconducting Cyclotron Laboratory at Michigan State University to measure the total kinetic energy of fragments in the focal plane of the large S800 magnetic spectrometer at NSCL. This measurement is necessary to provide independent charge and mass number identification of the heavy ions at the focal plane. The array consists of 32 closely packed 3''x3''x2'' CsI(Na) crystals each coupled to a photomultiplier. The properties of the array were characterized with a mono-energetic $^{76}$Ge beam and fragmentation products from reactions with beryllium and gold targerts. Results of these tests and an overview of the capabilities of the new hodoscope will be presented. [Preview Abstract] |
Friday, November 5, 2010 3:00PM - 3:12PM |
JF.00006: Pixelated parallel-plate avalanche counter for the $\gamma$-ray energy tracking arrays C.Y. Wu, D. Cline, A.B. Hayes, I.Y. Lee We plan to improve the CHICO position resolution to match that of GRETINA by adopting the pixelated boards with spherical coordinate $\theta$ and $\phi$ sensing. This allows very fine corrections of the Doppler shift of observed $\gamma$ rays and achieving the $\gamma$-ray energy resolution to nearly the intrinsic resolution of Ge detector. An eight-layer pixelated board was designed and successfully fabricated. The board has a total of 961 pixels and each one has a dimension of 1.6 x 1.6 mm with a gap of 0.4 mm between them. The position is not determined by the individual pixel instead by taking the time difference between both ends of delay lines, where connections are made by interconnecting pixels with a checker-board pattern. The initial tests have demonstrated the feasibility of this technique that a highly uniform and linear-dependent position spectrum with a resolution better than 2 mm is achieved. Additional tests are in the planning stage to address issues related to the pulse height dependence with respect to the lateral distance and pixel size. We will report the results of the latest tests and discuss the science opportunities related to this upgrade. This work is supported by DOE, LLNL Contract DE-AC52-07NA27344 and LBNL Contract DE-AC02-05CH11231 as well as the NSF. [Preview Abstract] |
Friday, November 5, 2010 3:12PM - 3:24PM |
JF.00007: SciBath: A novel tracking detector for neutral particles Lance Garrison, Brandon Kunkler, Hans-Otto Meyer, Melanie Novak, Tyler Mikev, Rex Tayloe, Gerard Visser The SciBath prototype detector consists of 90 liters of liquid scintillator containing 768 wavelength-shifting fibers aligned in a three dimensional grid with no optical separation. This unique design allows detailed reconstruction of charged particle tracks in arbitrary directions. While constructed as a prototype neutrino detector it should also detect neutrons in the 1-100MeV range with high efficiency and good resolution. The device is currently being commissioned. Information on the detector performance will be presented along with a discussion of potential applications. [Preview Abstract] |
Friday, November 5, 2010 3:24PM - 3:36PM |
JF.00008: Characterization and Efficiency of the Versatile Array of Neutron Detectors at Low Energy (VANDLE) William Peters, C. Matei, I. Spassova, D.W. Bardayan, J.C. Blackmon, J.A. Cizewski, P.D. O'Malley, B. Manning, E. Merino, T. Massey, C. Brune, R.K. Grzywacz, M. Maduga, S. Paulauskas, F. Sarazin, F. Raiola, D. Walter The Versatile Array of Neutron Detectors at Low Energy (VANDLE) is a new array of plastic scintillator bars being developed at the Holifield Radioactive Ion Beam Facility (HRIBF) at Oak Ridge National Laboratory (ORNL). The modular design enables optimization of different configurations for particular experiments, such as (d,n) and beta-delayed neutron-decay experiments, with rare ion beams. Twenty prototype modules, of two different sizes, have been put together and characterized for dynamic range and scintillator attenuation. Proof-of-principle experiments have been performed for both beta-delayed neutron-decay and (d,n) reactions. In addition, we plan to measure the absolute efficiency of a few modules using a calibrated $^{27}$Al(d,n) reaction at the Edwards Accelerator Laboratory at Ohio University. We also have access to a sealed $^{252}$Cf source to measure relative efficiencies and for use with experiment setup design. Results from the characterization and efficiency tests of the modules and preliminary results from the proof-of-principle experiments will be presented. [Preview Abstract] |
Friday, November 5, 2010 3:36PM - 3:48PM |
JF.00009: Modular Total Absorption Spectrometer (MTAS) for decay heat studies of fission products Marzena Wolinska-Cichocka, Krzysztof Rykaczewski, Robert Grzywacz, Marek Karny, Aleksandra Kuzniak, Bertis Rasco First tests of new Modular Total Absorption Spectrometer (MTAS) will be presented. MTAS is under construction at the Holifield Radioactive Ion Beam Facility (HRIBF) at Oak Ridge National Laboratory. The delivery of first modules is expected in July 2010. The detector array consists of 19 NaI (Tl) hexagonal shape blocks, each one 21 inches long and 8 inches maximum diameter. The housing of the individual modules is kept at the minimum (0.8 mm carbon fiber) to reduce $\gamma$-absorption effects. The photo-peak efficiency is expected to reach nearly 90\% around 300 keV and over 75\% for a 5 MeV single $\gamma$-transition [1]. The total absorption gamma spectra measured with MTAS will be used to derive a true beta-feeding pattern for neutron-rich nuclei produced in the proton-induced fission of $^{238}$U at the HRIBF. In particular, the measurements of decay heat released by radioactive nuclei produced in nuclear fuels at will be performed. [1] B.C. Rasco, GEANT4 simulations (2010). [Preview Abstract] |
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