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23 results on '"Vandevender, B.A."'

1. G4CMP: Condensed matter physics simulation using the Geant4 toolkit

Author

Kelsey, M.H., Agnese, R., Alam, Y.F., Langroudy, I. Ataee, Azadbakht, E., Brandt, D., Bunker, R., Cabrera, B., Chang, Y.-Y., Coombes, H., Cormier, R.M., Diamond, M.D., Edwards, E.R., Figueroa-Feliciano, E., Gao, J., Harrington, P.M., Hong, Z., Hui, M., Kurinsky, N.A., Lawrence, R.E., Loer, B., Masten, M.G., Michaud, E., Michielin, E., Miller, J., Novati, V., Oblath, N.S., Orrell, J.L., Perry, W.L., Redl, P., Reynolds, T., Saab, T., Sadoulet, B., Serniak, K., Singh, J., Speaks, Z., Stanford, C., Stevens, J.R., Strube, J., Toback, D., Ullom, J.N., VanDevender, B.A., Vissers, M.R., Wilson, M.J., Wilson, J.S., Zatschler, B., and Zatschler, S.

Published
2023
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3. Focal-plane detector system for the KATRIN experiment

Author

Amsbaugh, J.F., Barrett, J., Beglarian, A., Bergmann, T., Bichsel, H., Bodine, L.I., Bonn, J., Boyd, N.M., Burritt, T.H., Chaoui, Z., Chilingaryan, S., Corona, T.J., Doe, P.J., Dunmore, J.A., Enomoto, S., Formaggio, J.A., Fränkle, F.M., Furse, D., Gemmeke, H., Glück, F., Harms, F., Harper, G.C., Hartmann, J., Howe, M.A., Kaboth, A., Kelsey, J., Knauer, M., Kopmann, A., Leber, M.L., Martin, E.L., Middleman, K.J., Myers, A.W., Oblath, N.S., Parno, D.S., Peterson, D.A., Petzold, L., Phillips, D.G., II, Renschler, P., Robertson, R.G.H., Schwarz, J., Steidl, M., Tcherniakhovski, D., Thümmler, T., Van Wechel, T.D., VanDevender, B.A., Vöcking, S., Wall, B.L., Wierman, K.L., Wilkerson, J.F., and Wüstling, S.

Published
2015
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4. Tritium Beta Spectrum and Neutrino Mass Limit from Cyclotron Radiation Emission Spectroscopy

Author

Ashtari Esfahani, A., Böser, A.S., Buzinsky, N., Carmona-Benitez, B.M.C., Claessens, C., de Viveiros, L., Doe, P.J., Fertl, M., Formaggio, J.A., Gaison, J.K., Gladstone, L., Grando, M., Guigue, M., Hartse, J., Heeger, K.M., Huyan, X., Johnston, C.J., Jones, A.M., Kazkaz, D.K., Laroque, B.H., Li, M., Lindman, A., Machado, E., Marsteller, A., Matthé, C., Mohiuddin, R., Monreal, B., Mueller, R., Nikkel, J.A., Novitski, E., Oblath, N.S., Peña, J.I., Pettus, W., Reimann, F.R., Robertson, R.G.H., Rosa de Jesús, D., Rybka, G., Saldaña, L., Schram, M., Slocum, G.P.L., Stachurska, J., Sun, Y.-H., Surukuchi, P.T., Tedeschi, J.R., Telles, A.B., Thomas, F., Thomas, M., Thorne, H.L.A., Thümmler, T., Tvrznikova, L., van de Pontseele, I.W., Vandevender, B.A., Weintroub, J., Weiss, T.E., Wendler, T., Young, A., Zayas, J.E., Ziegler, A., and HEP, INSPIRE

Subjects
radiation: emission, experimental methods, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], tritium: semileptonic decay, synchrotron radiation, background, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], neutrino: mass, krypton: nuclide, cyclotron, calibration, detector: design
Abstract

The absolute scale of the neutrino mass plays a critical role in physics at every scale, from the particle to cosmological. Measurements of the tritium endpoint spectrum have provided the most precise direct limit on the neutrino mass scale. In this Letter, we present advances by Project 8 to the Cyclotron Radiation Emission Spectroscopy (CRES) technique culminating in the first frequency-based neutrino mass limit. With only a cm$^3$-scale physical detection volume, a limit of $m_\beta$

Published
2023

5. Dead layer on silicon p–i–n diode charged-particle detectors

Author

Wall, B.L., Amsbaugh, J.F., Beglarian, A., Bergmann, T., Bichsel, H.C., Bodine, L.I., Boyd, N.M., Burritt, T.H., Chaoui, Z., Corona, T.J., Doe, P.J., Enomoto, S., Harms, F., Harper, G.C., Howe, M.A., Martin, E.L., Parno, D.S., Peterson, D.A., Petzold, L., Renschler, P., Robertson, R.G.H., Schwarz, J., Steidl, M., Van Wechel, T.D., VanDevender, B.A., Wüstling, S., Wierman, K.J., and Wilkerson, J.F.

Published
2014
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6. A search for astrophysical burst signals at the Sudbury Neutrino Observatory

Author

Aharmim, B., Ahmed, S.N., Anthony, A.E., Barros, N., Beier, E.W., Bellerive, A., Beltran, B., Bergevin, M., Biller, S.D., Boudjemline, K., Boulay, M.G., Cai, B., Chan, Y.D., Chauhan, D., Chen, M., Cleveland, B.T., Cox, G.A., Dai, X., Deng, H., Detwiler, J.A., DiMarco, M., Diamond, M.D., Doe, P.J., Doucas, G., Drouin, P.-L., Duncan, F.A., Dunford, M., Earle, E.D., Elliott, S.R., Evans, H.C., Ewan, G.T., Farine, J., Fergani, H., Fleurot, F., Ford, R.J., Formaggio, J.A., Gagnon, N., Goon, J.TM., Graham, K., Guillian, E., Habib, S., Hahn, R.L., Hallin, A.L., Hallman, E.D., Harvey, P.J., Hazama, R., Heintzelman, W.J., Heise, J., Helmer, R.L., Hime, A., Howard, C., Huang, M., Jagam, P., Jamieson, B., Jelley, N.A., Jerkins, M., Keeter, K.J., Klein, J.R., Kormos, L.L., Kos, M., Kraus, C., Krauss, C.B., Krueger, A., Kutter, T., Kyba, C.C.M., Lange, R., Law, J., Lawson, I.T., Lesko, K.T., Leslie, J.R., Levine, I., Loach, J.C., MacLellan, R., Majerus, S., Mak, H.B., Maneira, J., Martin, R., McCauley, N., McDonald, A.B., McGee, S.R., Miller, M.L., Monreal, B., Monroe, J., Nickel, B.G., Noble, A.J., O’Keeffe, H.M., Oblath, N.S., Ollerhead, R.W., Orebi Gann, G.D., Oser, S.M., Ott, R.A., Peeters, S.J.M., Poon, A.W.P., Prior, G., Reitzner, S.D., Rielage, K., Robertson, B.C., Robertson, R.G.H., Schwendener, M.H., Secrest, J.A., Seibert, S.R., Simard, O., Simpson, J.J., Sinclair, D., Skensved, P., Sonley, T.J., Stonehill, L.C., Tešić, G., Tolich, N., Tsui, T., Van Berg, R., VanDevender, B.A., Virtue, C.J., Wall, B.L., Waller, D., Wan Chan Tseung, H., Wark, D.L., Watson, P.J.S., Wendland, J., West, N., Wilkerson, J.F., Wilson, J.R., Wouters, J.M., Wright, A., Yeh, M., Zhang, F., and Zuber, K.

Published
2014
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7. Viterbi Decoding of CRES Signals in Project 8

Author

Esfahani, A. Ashtari, Bogorad, Z., Böser, S., Buzinsky, N., Claessens, C., De Viveiros, L., Fertl, M., Formaggio, J.A., Gladstone, L., Gödel, M., Grando, M., Guigue, M., Hartse, J., Heeger, K.M., Huyan, X., Johnston, J., Jones, A.M., Kazkaz, K., LaRoque, B.H., Li, M., Lindman, A., Machado, E., Matthé, C., Mohiuddin, R., Monreal, B., Nikkel, J.A., Novitski, E., Oblath, N.S., Peña, J.I., Pettus, W., Reimann, R., Robertson, R.G.H., Rybka, G., Saldaña, L., Schram, M., Slocum, P.L., Stachurska, J., Sun, Y.-H., Surukuchi, P.T., Telles, A.B., Thomas, F., Thomas, M., Thümmler, T., Tvrznikova, L., Van De Pontseele, W., VanDevender, B.A., Weiss, T.E., Wendler, T., Zayas, E., Ziegler, A., Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)

Subjects
data analysis method, noise, radiation: emission, Physics - Instrumentation and Detectors, Physics, Markov chain, General Physics and Astronomy, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), programming, radiation: energy spectrum, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), charged particle: energy, gas, ddc:530, spectrometer, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], numerical calculations: Monte Carlo, detector: design
Abstract

Cyclotron Radiation Emission Spectroscopy (CRES) is a modern approach for determining charged particle energies via high-precision frequency measurements of the emitted cyclotron radiation. For CRES experiments with gas within the fiducial volume, signal and noise dynamics can be modelled by a hidden Markov model. We introduce a novel application of the Viterbi algorithm in order to derive informational limits on the optimal detection of cyclotron radiation signals in this class of gas-filled CRES experiments, thereby providing concrete limits from which future reconstruction algorithms, as well as detector designs, can be constrained. The validity of the resultant decision rules is confirmed using both Monte Carlo and Project 8 data., 13 pages, 5 figures

Published
2021

8. An array of low-background 3He proportional counters for the Sudbury Neutrino Observatory

Author

Amsbaugh, J.F., Anaya, J.M., Banar, J., Bowles, T.J., Browne, M.C., Bullard, T.V., Burritt, T.H., Cox-Mobrand, G.A., Dai, X., Deng, H., Di Marco, M., Doe, P.J., Dragowsky, M.R., Duba, C.A., Duncan, F.A., Earle, E.D., Elliott, S.R., Esch, E.-I., Fergani, H., Formaggio, J.A., Fowler, M.M., Franklin, J.E., Geissbühler, P., Germani, J.V., Goldschmidt, A., Guillian, E., Hallin, A.L., Harper, G., Harvey, P.J., Hazama, R., Heeger, K.M., Heise, J., Hime, A., Howe, M.A., Huang, M., Kormos, L.L., Kraus, C., Krauss, C.B., Law, J., Lawson, I.T., Lesko, K.T., Loach, J.C., Majerus, S., Manor, J., McGee, S., Miknaitis, K.K.S., Miller, G.G., Morissette, B., Myers, A., Oblath, N.S., O’Keeffe, H.M., Ollerhead, R.W., Peeters, S.J.M., Poon, A.W.P., Prior, G., Reitzner, S.D., Rielage, K., Robertson, R.G.H., Skensved, P., Smith, A.R., Smith, M.W.E., Steiger, T.D., Stonehill, L.C., Thornewell, P.M., Tolich, N., VanDevender, B.A., Van Wechel, T.D., Wall, B.L., Wan Chan Tseung, H., Wendland, J., West, N., Wilhelmy, J.B., Wilkerson, J.F., and Wouters, J.M.

Published
2007
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9. Design, commissioning and performance of the PIBETA detector at PSI

Author

Frlež, E, Počanić, D, Assamagan, K.A, Bagaturia, Yu, Baranov, V.A, Bertl, W, Brönnimann, Ch, Bychkov, M, Crawford, J.F, Daum, M, Flügel, Th, Frosch, R, Horisberger, R, Kalinnikov, V.A, Karpukhin, V.V, Khomutov, N.V, Koglin, J.E, Korenchenko, A.S, Korenchenko, S.M, Kozlowski, T, Krause, B, Kravchuk, N.P, Kuchinsky, N.A, Li, W, Lawrence, D.W, Minehart, R.C, Mzhavia, D, Obermeier, H, Renker, D, Ritchie, B.G, Ritt, S, Sakhelashvili, T, Schnyder, R, Sidorkin, V.V, Slocum, P.L, Smith, L.C, Soić, N, Stephens, W.A, Supek, I, Tsamalaidze, Z, VanDevender, B.A, Wang, Y, Wirtz, H.P, and Ziock, K.O.H

Published
2004
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10. Focal-plane detector system for the KATRIN experiment

Author

Petzold, L., Formaggio, J.A., Kelsey, J., Oblath, N.S., Chaoui, Z., Kopmann, A., Dunmore, J.A., Chilingaryan, S., Enomoto, S., Bergmann, T., Wilkerson, J.F., Robertson, R.G.H., Howe, M.A., Doe, P.J., Vöcking, S., Knauer, M., Thümmler, T., Phillips, D.G., Burritt, T.H., Wüstling, S., Bodine, L.I., Harper, G.C., Leber, M.L., VanDevender, B.A., Parno, D.S., Corona, T.J., Beglarian, A., Renschler, P., Peterson, D.A., Gemmeke, H., Wall, B.L., Hartmann, J., Bonn, J., Bichsel, H., Middleman, K.J., Furse, D., Myers, A.W., Boyd, N.M., Martin, E.L., Harms, F., Glück, F., Amsbaugh, J.F., Fränkle, F.M., Kaboth, A., Barrett, J., Steidl, M., Van Wechel, T.D., Tcherniakhovski, D., Wierman, K.L., and Schwarz, J.

Subjects
Physics::Instrumentation and Detectors
Abstract

The focal-plane detector system for the KArlsruhe TRItium Neutrino (KATRIN) experiment consists of a multi-pixel silicon p-i-n-diode array, custom readout electronics, two superconducting solenoid magnets, an ultra high-vacuum system, a high-vacuum system, calibration and monitoring devices, a scintillating veto, and a custom data-acquisition system. It is designed to detect the low-energy electrons selected by the KATRIN main spectrometer. We describe the system and summarize its performance after its final installation.

Published
2015
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11. Dead layer on silicon p–i–n diode charged-particle detectors

Author

Wüstling, S., VanDevender, B.A., Wall, B.L., Schwarz, J., Peterson, D.A., Wilkerson, J.F., Bodine, L.I., Parno, D.S., Howe, M.A., Van Wechel, T.D., Martin, E.L., Renschler, P., Bichsel, H.C., Chaoui, Z., Harper, G.C., Beglarian, A., Boyd, N.M., Enomoto, S., Petzold, L., Doe, P.J., Harms, F., Wierman, K.J., Robertson, R.G.H., Bergmann, T., Corona, T.J., Burritt, T.H., Amsbaugh, J.F., and Steidl, M.

Subjects
Physics::Instrumentation and Detectors
Abstract

Semiconductor detectors in general have a dead layer at their surfaces that is either a result of natural or induced passivation, or is formed during the process of making a contact. Charged particles passing through this region produce ionization that is incompletely collected and recorded, which leads to departures from the ideal in both energy deposition and resolution. The silicon p-i-n diode used in the KATRIN neutrinomass experiment has such a dead layer. We have constructed a detailed Monte Carlo model for the passage of electrons from vacuum into a silicon detector, and compared the measured energy spectra to the predicted ones for a range of energies from 12 to 20 keV. The comparison provides experimental evidence that a substantial fraction of the ionization produced in the "dead" layer evidently escapes by diffusion, with 46% being collected in the depletion zone and the balance being neutralized at the contact or by bulk recombination. The most elementary model of a thinner dead layer from which no charge is collected is strongly disfavored.

Published
2014
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12. New Precise Measurement of the Pion Weak Form Factors in the Pi+ -> e+ nu gamma Decay

Author

Bychkov, M., Počanić, Dinko, VanDevender, B.A., Baranov, V.A., Bertl, W., Bystritsky, Yu. M., Frlež, Emil, Kalinnikov, V.A., Khomutov, N.V., Korenchenko, N.S., Korenchenko, S.M., Korolija, Milorad, Kozlowski, T., Kravchuk, N.P., Kuchinsky, N.A., Li, W., Mekterović, Darko, Mzhavia, D., Ritt, S., Robmann, P., Rondon-Aramayo, O.A., Rozhdestvensky, A.M., Sakhelashvili, T., Scheu, S., Straumann, U., Supek, Ivan, Tsamalaidze, Z., van der Schaaf, A., and Velicheva, E.P.

Subjects
New Precise Measurement
Abstract

We have measured the + ! e+ branching ratio over a wide region of phase space, based on a total of 65, 460 events acquired using the PIBETA detector. Minimum- 2 ts to the measured (Ee+ ; E) energy distributions result in the weak form factor value of FA = 0:0119(1) with a xed value of FV = 0:0259. An unconstrained t yields FV = 0:0258(17) and FA = 0:0117(17). In addition, we have measured a = 0:095 0:058 for the dependence of FV on the e+ pair invariant mass q2, parametrized as FV (q2) = FV (0)(1 + a q2). The branching ratio for the kinematic region E > 10MeV and e+ > 40 is measured to be Bexp = 73:86(54) 10

Published
2008

13. A Search for Neutrinos from the Solar hep Reaction and the Diffuse Supernova Neutrino Background with the Sudbury Neutrino Observatory

Author

Aharmim, B., Ahmed, S.N., Anthony, A.E., Beier, E.W., Bellerive, A., Bergevin, M., Biller, S.D., Boulay, M.G., Chan, Y.D., Chen, M., Chen, X., Cleveland, B.T., Cox, G.A., Currat, C.A., Dai, X., Dalnoki-Veress, F., Deng, H., Detwiler, J., DiMarco, M., Doe, P.J., Doucas, G., Drouin, P.-L., Duncan, F.A., Dunford, M., Dunmore, J.A., Earle, E.D., Evans, H.C., Ewan, G.T., Farine, J., Fergani, H., Fleurot, F., Ford, R.J., Formaggio, J.A., Gagnon, N., Goon, J.T.M., Graham, K., Guillian, E., Hahn, R.L., Hallin, A.L., Hallman, E.D., Harvey, P.J., Hazama, R., Heeger, K.M., Heintzelman, W.J., Heise, J., Helmer, R.L., Hemingway, R.J., Henning, R., Hime, A., Howard, C., Howe, M.A., Huang, M., Jagam, P., Jelley, N.A., Klein, J.R., Kormos, L.L., Kos, M., Krueger, A., Kraus, C., Krauss, C.B., Kutter, T., Kyba, C.C.M., Labranche, H., Lange, R., Law, J.Lawson.I.T., Lesko, K.T., Leslie, J.R., Loach, J.C., Luoma, S., MacLellan, R., Majerus, S., Mak, H.B., Maneira, J., Marino, A.D., Martin, R., McCauley, N., McDonald, A.B., McGee, S., Mifflin, C., Miknaitis, K.K.S., Miller, M.L., Monreal, B., Nickel, B.G., Noble, A.J., Norman, E.B., Oblath, N.S., Okada, C.E., O'Keeffe, H.M., Orebi Gann, G.D., Oser, S.M., Ott, R., Peeters, S.J.M., Poon, A.W.P., Prior, G., Rielage, K., Robertson, B.C., Robertson, R.G.H., Rollin, E., Schwendener, M.H., Secrest, J.A., Seibert, S.R., Simard, O., Sims, C.J., Sinclair, D., Skensved, P., Stokstad, R.G., Stonehill, L.C., Tesic, G., Tolich, N., Tsui, T., Van Berg, R., Van de Water, R.G., VanDevender, B.A., Virtue, C.J., Walker, T.J., Wall, B.L., Waller, D., Wan Chan Tseung, H., Wark, D.L., Wendland, J., West, N., Wilkerson, J.F., Wilson, J.R., Wouters, J.M., Wright, A., Yeh, M., Zhang, F., and Zuber, K.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Experiment
Abstract

A search has been made for neutrinos from the hep reaction in the Sun and from the diffuse supernova neutrino background (DSNB) using data collected during the first operational phase of the Sudbury Neutrino Observatory, with an exposure of 0.65 kilotonne-years. For the hep neutrino search, two events are observed in the effective electron energy range of 14.3 MeV < Teff < 20 MeV where 3.1 background events are expected. After accounting for neutrino oscillations, an upper limit of 2.3 x 104 cm-2s-1 at the 90 percent confidence level is inferred on the integral total flux of hep neutrinos. For DSNB neutrinos, no events are observed in the effective electron energy range of 21 MeV < Teff < 35 MeV and, consequently, an upper limit on the nu e component of the DSNB fluxin the neutrino energy range of 22.9 MeV < E nu < 36.9 MeV of 70 cm-2-1 is inferred at the 90 percent confidence level. This is an improvement by a factor of 6.5 on the previous best upper limit on the hep neutrino flux and by two orders of magnitude on the previous upper limit on the nu e component of the DSNB flux.

Published
2006

14. A new evaluation of the pion weak form factors

Author

Počanić, Dinko, Frlež, Emil, Baranov, V.A., Bertl, W., Bronnimann, Ch., Bychkov, M.: Crawford, J.F., Daum, M., Khomutov, N.V., Korenchenko, A.S., Korenchenko, S.M., Kozlowski, T., Kravchuk, N.P., Kuchinsky, N.A., Li, W., Minehart, R.C., Mzhavia, D., Ritchie, B.G., Ritt, S., Rozhdestvensky, A.M., Sidorkin, V.V., Smith, L.C., Supek, Ivan, Tsamalaidze, Z., VanDevender, B.A., Wang, Y., Wirtz, H.-P., and Ziock, K.O.H.

Subjects
pion weak form factor, rare decays, radiative decay, High Energy Physics::Experiment
Abstract

We have used the PIBETA large-acceptance detector for a precise measurement of the pi+->e+nigama radiative decay at rest, with a broad phase space coverage. Using the CVC value for the pion vector form factor, F_V=0.0259(5), we have obtained a new value of the pion axial-vector form factor gamma=F_A/F_V=0.429(14). However, significant deviations from the SM predictions are evident in our data. The discrepancy can be accounted for by introducing a pion tensor form factor of F_T=-0.0016(3). The question of the true nature of the observed deviations remains open pending further theoretical and experimental study.

Published
2004

15. Precise measurement of the Pi+ -> Pi0 e+nu branching ratio

Author

Počanić, Dinko, Frlež, Emil, Baranov, V.A., Bertl, W., Bronnimann, Ch., Bychkov, M.: Crawford, J.F., Daum, M., Khomutov, N.V., Korenchenko, A.S., Korenchenko, S.M., Kozlowski, T., Kravchuk, N.P., Kuchinsky, N.A., Li, W., Minehart, R.C., Mzhavia, D., Ritchie, B.G., Ritt, S., Rozhdestvensky, A.M., Sidorkin, V.V., Smith, L.C., Supek, Ivan, Tsamalaidze, Z., VanDevender, B.A., Wang, Y., Wirtz, H.-P., and Ziock, K.O.H.

Subjects
pion beta decay, branching ratio, Standard Model, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Using a large acceptance calorimeter and a stopped pion beam we have made a precise measurement of the rare Pi+ --> Pi0 e+ nu decay branching ratio. We have evaluated the branching ratio by normalizing the number of observed pion beta decays to the number of observed Pi+ --> e+ nu decays. We find the value of Gama(Pi+ --> Pi0 e+ nu)/Gama (total) = [1:036 +/- 0:004 (stat:) +/- 0:004 (syst:) +/- 0:003 ] x10-8, where the first uncertainty is statistical, the second systematic, and the third is the Pi+ -> e+ nu branching ratio uncertainty. Our result agrees well with the Standard Model prediction.

Published
2004

16. Absolute branching ratio normalization for rare pi^+ and mi^+ decay in the PIBETA experiment

Author

Frlez, E., Počanić, Dinko, Assamagan, K.A., Bagaturia, Yu., Baranov, V.A., Bertl, W., Bronnimann, Ch., Bychkov, M., Crawford, J.F., Daum, M., Flugel, Th., Frosch, R., Horisberger, R., Kalinnikov, V.A., Karpukhin, V.V., Khomutov, N.V., Koglin, J.E., Korenchenko, A.S., Korenchenko, S.M., Kozlowski, T., Krause, B., Kravchuk, N.P., Kuchinsky, N.A., Li, W., Lawrence, D.W., Minehart, R.C., Mzhavia, D., Obermeier, H., Renker, D., Ritchie, B.G., Ritt, S., Sakhelashvili, T., Schnyder, R., Sidorkin, V.V., Slocum, P.L., Smith, L.C., Soić, Neven, Stephens, W.A., Supek, Ivan, Tsamalaidze, Z., VanDevender, B.A., Wang, Y., Wirtz H.P., and Ziock K.O.H.

Subjects
determination of CKM matrix elements, decays of pions and muons, properties of pions and muons
Abstract

We have used the PIBETA detector at the PSI for a precise measurement of rare pion and muon weak decays. We have collected a large statistic al sample of (1) pi+->e+ni_e, (2) pi+->pi0e+ni_e, (3) pi+->e+ni_egama, (4) pi+->e+ni_eni_mi, and (5) pi+->e+ni_eni_migama decays. We have evaluated the aboslute branching ratiosfor these processes by normalizing to the independently measured number of decaying pi+'s (or pi+'s). We discuss the mutual consistency of the preliminary results.

Published
2004

17. Precise measurement of the pion axial form factor in the pi^+ --> e^+ ni gamma decay

Author

Frlež, Emil, Počanić, Dinko, Baranov, V.A., Bertl, W., Bychkov, Khomutov, N.V., Korenchenko, A.S., Korenchenko, S.M., Kozlowski, T., Kravchuk, N.P., Kuchinsky, N.A., Li, W., Minehart, R.C., Mzhavia, D., Ritchie, B.G., Ritt, S., Rozhdestvensky, A.M., Sidorkin, V.V., Smith, L.C., Supek, Ivan, Tsamalaidze, Z., VanDevender, B.A., Velicheva, E.P., Wang, Y., Wirtz, H.-P., and Ziock, K.O.H.

Subjects
pion beta decay, branching ratio, Standard Model
Abstract

We have studied radiative pion decays pi^+--e^+ni^gamma in three broad kinematic regions using the PIBETA detector and a stopped pion beam. Based on Dalitz distributions of 41 601 events we have evaluated absolute pi e ni^gamma branching ratios in the three regions. Minimum Ksi^2 fits to the integral and differential (Ee+, Egamma) distributions result in the axial-to-vector weak form factor ratio of gamma FA/FV = 0.443(15), or FA = 0.0115(4) with FV = 0.0259. However, deviations from standard model predictions in the high-Egamma– low-Ee+ kinematic region indicate the need for further theoretical and experimental work.

Published
2004

18. New results from the PIBETA experiment

Author

Počanić, Dinko, Frlež, Emil, Baranov, V.A., Bertl, W., Bronnimann, Ch., Bychkov, M.: Crawford, J.F., Daum, M., Khomutov, N.V., Korenchenko, A.S., Korenchenko, S.M., Kozlowski, T., Kravchuk, N.P., Kuchinsky, N.A., Li, W., Minehart, R.C., Mzhavia, D., Ritchie, B.G., Ritt, S., Rozhdestvensky, A.M., Sidorkin, V.V., Smith, L.C., Supek, Ivan, Tsamalaidze, Z., VanDevender, B.A., Wang, Y., Wirtz, H.-P., and Ziock, K.O.H.

Subjects
PIBETA experiment
Published
2003

21. Performance of a TiN-coated monolithic silicon pin-diode array under mechanical stress

Author

VanDevender, B.A., Bodine, L.I., Myers, A.W., Amsbaugh, J.F., Howe, M.A., Leber, M.L., Robertson, R.G.H., Tolich, K., Van Wechel, T.D., and Wall, B.L.

Subjects
*PERFORMANCE evaluation, *TITANIUM nitride, *SURFACE coatings, *ELECTROMAGNETISM, *PHYSICS experiments, *STRAINS & stresses (Mechanics), *NUCLEAR counters, *ELECTRIC contacts
Abstract

Abstract: The Karlsruhe Tritium Neutrino Experiment (KATRIN) will detect tritium electrons that pass through its electromagnetic spectrometer with a highly segmented monolithic silicon pin-diode focal-plane detector (FPD). This pin-diode array will be on a single piece of silicon, with contact between titanium nitride (TiN)-coated detector pixels and front-end electronics made by spring-loaded pogo pins. The pogo pins will exert a total force of up to 50N on the detector, deforming it and resulting in mechanical stress up to 50MPa in the silicon bulk. We have evaluated a prototype pin-diode array with a pogo-pin connection scheme similar to the KATRIN FPD. We find that pogo pins make good electrical contact to TiN and observe no effects on detector resolution or reverse-bias leakage current which can be attributed to mechanical stress. [Copyright &y& Elsevier]

Published
2012
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22. The C-4 dark matter experiment

Author

Bonicalzi, R.M., Collar, J.I., Colaresi, J., Fast, J.E., Fields, N.E., Fuller, E.S., Hai, M., Hossbach, T.W., Kos, M.S., Orrell, J.L., Overman, C.T., Reid, D.J., VanDevender, B.A., Wiseman, C., and Yocum, K.M.

Subjects
*NUCLEAR physics experiments, *NUCLEAR counters, *GERMANIUM diodes, *RADIOACTIVE nuclear beams, *NUCLEAR energy, *DATA analysis
Abstract

Abstract: 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. [Copyright &y& Elsevier]

Published
2013
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23. Four methods for determining the composition of trace radioactive surface contamination of low-radioactivity metal

Author

O'Keeffe, H.M., Burritt, T.H., Cleveland, B.T., Doucas, G., Gagnon, N., Jelley, N.A., Kraus, C., Lawson, I.T., Majerus, S., McGee, S.R., Myers, A.W., Poon, A.W.P., Rielage, K., Robertson, R.G.H., Rosten, R.C., Stonehill, L.C., VanDevender, B.A., and Van Wechel, T.D.

Subjects
*SURFACE contamination, *RADIOACTIVE tracers, *THORIUM, *URANIUM, *CHERENKOV radiation, *RADIOCHEMISTRY
Abstract

Abstract: Four methods for determining the composition of low-level uranium- and thorium-chain surface contamination are presented. One method is the observation of Cherenkov light production in water. In two additional methods a position-sensitive proportional counter surrounding the surface is used to make both a measurement of the energy spectrum of alpha particle emissions and also coincidence measurements to derive the thorium-chain content based on the presence of short-lived isotopes in that decay chain. The fourth method is a radiochemical technique in which the surface is eluted with a weak acid, the eluate is concentrated, added to liquid scintillator and assayed by recording beta–alpha coincidences. These methods were used to characterize two ‘hotspots’ on the outer surface of one of the 3He proportional counters in the Neutral Current Detection array of the Sudbury Neutrino Observatory experiment. The methods have similar sensitivities, of order tens of ng, to both thorium- and uranium-chain contamination. [Copyright &y& Elsevier]

Published
2011
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