Browsing by Author "Back, HO"
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Item Open Access A segmented, enriched N-type germanium detector for neutrinoless double beta-decay experiments(Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2014-01-01) Leviner, LE; Aalseth, CE; Ahmed, MW; Avignone, FT; Back, HO; Barabash, AS; Boswell, M; De Braeckeleer, L; Brudanin, VB; Chan, YD; Egorov, VG; Elliott, SR; Gehman, VM; Hossbach, TW; Kephart, JD; Kidd, MF; Konovalov, SI; Lesko, KT; Li, J; Mei, DM; Mikhailov, S; Miley, H; Radford, DC; Reeves, J; Sandukovsky, VG; Umatov, VI; Underwood, TA; Tornow, W; Wu, YK; Young, ARWe present data characterizing the performance of the first segmented, N-type Ge detector, isotopically enriched to 85% 76Ge. This detector, based on the Ortec PT6×2 design and referred to as SEGA (Segmented, Enriched Germanium Assembly), was developed as a possible prototype for neutrinoless double beta-decay measurements by the Majorana collaboration. We present some of the general characteristics (including bias potential, efficiency, leakage current, and integral cross-talk) for this detector in its temporary cryostat. We also present an analysis of the resolution of the detector, and demonstrate that for all but two segments there is at least one channel that reaches the Majorana resolution goal below 4 keV FWHM at 2039 keV, and all channels are below 4.5 keV FWHM. © 2013 Elsevier B.V.Item Open Access Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons(2010) Liu, J; Mendenhall, MP; Holley, AT; Back, HO; Bowles, TJ; Broussard, LJ; Carr, R; Clayton, S; Currie, S; Filippone, BW; García, A; Geltenbort, P; Hickerson, KP; Hoagland, J; Hogan, GE; Hona, B; Ito, TM; Liu, C-Y; Makela, M; Mammei, RR; Martin, JW; Melconian, D; Morris, CL; Pattie, RW; Pérez Galván, A; Pitt, ML; Plaster, B; Ramsey, JC; Rios, R; Russell, R; Saunders, A; Seestrom, SJ; Sondheim, WE; Tatar, E; Vogelaar, RB; VornDick, B; Wrede, C; Yan, H; Young, AR; UCNA CollaborationA precise measurement of the neutron decay beta asymmetry A(0) has been carried out using polarized ultracold neutrons from the pulsed spallation ultracold neutron source at the Los Alamos Neutron Science Center. Combining data obtained in 2008 and 2009, we report A(0) = -0.119 66 +/- 0.000 89(-0.001 40)(+0.001 23), from which we determine the ratio of the axial- vector to vector weak coupling of the nucleon gA/gV = -1.275 90(-0.004 45)(+0.004 09).