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1. Final results for the neutron $\beta$-asymmetry parameter $A_0$ from the UCNA experiment

Author

Plaster, B., Adamek, E., Allgeier, B., Anaya, J., Back, H. O., Bagdasarova, Y., Berguno, D. B., Blatnik, M., Boissevain, J. G., Bowles, T. J., Broussard, L. J., Brown, M. A. -P., Carr, R., Clark, D. J., Clayton, S., Cude-Woods, C., Currie, S., Dees, E. B., Ding, X., Du, S., Filippone, B. W., Garcia, A., Geltenbort, P., Hasan, S., Hawari, A., Hickerson, K. P., Hill, R., Hino, M., Hoagland, J., Hoedl, S. A., Hogan, G. E., Hona, B., Hong, R., Holley, A. T., Ito, T. M., Kawai, T., Kirch, K., Kitagaki, S., Knecht, A., Lamoreaux, S. K., Liu, C. -Y., Liu, J., Makela, M., Mammei, R. R., Martin, J. W., Meier, N., Melconian, D., Mendenhall, M. P., Moore, S. D., Morris, C. L., Mortensen, R., Nepal, S., Nouri, N., Pattie, R. W., Galvan, A. Perez, Phillips, D. G., Pichlmaier, A., Picker, R., Pitt, M. L., Ramsey, J. C., Rios, R., Russell, R., Sabourov, K., Sallaska, A. L., Salvat, D. J., Saunders, A., Schmid, R., Seestrom, S. J., Servicky, C., Sharapov, E. I., Sjue, S. K. L., Slutsky, S., Smith, D., Sondheim, W. E., Sun, X., Swank, C., Swift, G., Tatar, E., Teasdale, W., Terai, C., Tipton, B., Utsuro, M., Vogelaar, R. B., VornDick, B., Wang, Z., Wehring, B., Wexler, J., Womack, T., Wrede, C., Xu, Y. P., Yan, H., Young, A. R., Yuan, J., and Zeck, B. A.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

The UCNA experiment was designed to measure the neutron $\beta$-asymmetry parameter $A_0$ using polarized ultracold neutrons (UCN). UCN produced via downscattering in solid deuterium were polarized via transport through a 7 T magnetic field, and then directed to a 1 T solenoidal electron spectrometer, where the decay electrons were detected in electron detector packages located on the two ends of the spectrometer. A value for $A_0$ was then extracted from the asymmetry in the numbers of counts in the two detector packages. We summarize all of the results from the UCNA experiment, obtained during run periods in 2007, 2008--2009, 2010, and 2011--2013, which ultimately culminated in a 0.67\% precision result for $A_0$., Comment: 6 pages, 7 figures, to appear in proceedings of the International Workshop on Particle Physics at Neutron Sources 2018

Published
2019
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4. Electron-capture branch of 100Tc and tests of nuclear wave functions for double-beta decays

Author

Sjue, S. K. L., Melconian, D., Garcia, A., Ahmad, I., Algora, A., Aysto, J., Elomaa, V. -V., Eronen, T., Hakala, J., Hoedl, S., Kankainen, A., Kessler, T., Moore, I. D., Naab, F., Penttila, H., Rahaman, S., Saastamoinen, A., Swanson, H. E., Weber, C., Triambak, S., and Deryckx, K.

Subjects
Nuclear Experiment
Abstract

We present a measurement of the electron-capture branch of $^{100}$Tc. Our value, $B(\text{EC}) = (2.6 \pm 0.4) \times 10^{-5}$, implies that the $^{100}$Mo neutrino absorption cross section to the ground state of $^{100}$Tc is roughly one third larger than previously thought. Compared to previous measurements, our value of $B(\text{EC})$ prevents a smaller disagreement with QRPA calculations relevant to double-$\beta$ decay matrix elements.

Published
2008
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5. Particle Physics Implications of a Recent Test of the Gravitational Inverse Square Law

Author

Adelberger, E. G., Heckel, B. R., Hoedl, S., Hoyle, C. D., Kapner, D. J., and Upadhye, A.

Subjects
High Energy Physics - Phenomenology
Abstract

We use data from our recent search for violations of the gravitational inverse-square law to constrain dilaton, radion and chameleon exchange forces as well as arbitrary vector or scalar interactions. We test the interpretation of the PVLAS effect and a conjectured ``fat graviton'' scenario and constrain the $\gamma_5$ couplings of pseuodscalar bosons and arbitrary power-law interactions., Comment: 4 pages, 5 figures corrected author list and title and added figure of chameleon constraints

Published
2006
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6. New Measurements and Quantitative Analysis of Electron Backscattering in the Energy Range of Neutron Beta-Decay

Author

Martin, J. W., Yuan, J., Betancourt, M. J., Filippone, B. W., Hoedl, S. A., Ito, T. M., Plaster, B., and Young, A. R.

Subjects
Nuclear Experiment
Abstract

We report on the first detailed measurements of electron backscattering from plastic scintillator targets, extending our previous work on beryllium and silicon targets. The scintillator experiment posed several additional experimental challenges associated with charging of the scintillator target, and those challenges are addressed in detail. In addition, we quantitatively compare the energy and angular distributions of this data, and our previous data, with electron transport simulations based on the Geant4 and Penelope Monte Carlo simulation codes. The Penelope simulation is found globally to give a superior description of the data. Such information is crucial for a broad array of weak-interaction physics experiments, where electron backscattering can give rise to the dominant detector-related systematic uncertainty., Comment: 7 pages, 3 figures

Published
2005
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7. Demonstration of a solid deuterium source of ultra-cold neutrons

Author

Saunders, A., Anaya, J. M., Bowles, T. J., Filippone, B. W., Geltenbort, P., Hill, R. E., Hino, M., Hoedl, S., Hogan, G. E., Ito, T. M., Jones, K. W., Kawai, T., Kirch, K., Lamoreaux, S. K., Liu, C. -Y., Makela, M., Marek, L. J., Martin, J. W., Morris, C. L., Mortensen, R. N., Pichlmaier, A., Seestrom, S. J., Serebrov, A., Smith, D., Teasdale, W., Tipton, B., Vogelaar, R. B., Young, A. R., and Yuan, J.

Subjects
Nuclear Experiment
Abstract

Ultra-cold neutrons (UCN), neutrons with energies low enough to be confined by the Fermi potential in material bottles, are playing an increasing role in measurements of fundamental properties of the neutron. The ability to manipulate UCN with material guides and bottles, magnetic fields, and gravity can lead to experiments with lower systematic errors than have been obtained in experiments with cold neutron beams. The UCN densities provided by existing reactor sources limit these experiments. The promise of much higher densities from solid deuterium sources has led to proposed facilities coupled to both reactor and spallation neutron sources. In this paper we report on the performance of a prototype spallation neutron-driven solid deuterium source. This source produced bottled UCN densities of 145 +/-7 UCN/cm3, about three times greater than the largest bottled UCN densities previously reported. These results indicate that a production UCN source with substantially higher densities should be possible.

Published
2003
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8. Measurement of Electron Backscattering in the Energy Range of Neutron $\beta$-Decay

Author

Martin, J. W., Yuan, J., Hoedl, S. A., Filippone, B. W., Fong, D., Ito, T. M., Lin, E., Tipton, B., and Young, A. R.

Subjects
Nuclear Experiment
Abstract

We report on the first detailed measurements of electron backscattering from low Z targets at energies up to 124 keV. Both energy and angular distributions of the backscattered electrons are measured and compared with electron transport simulations based on the Geant4 and Penelope Monte Carlo simulation codes. Comparisons are also made with previous, less extensive, measurements and with measurements at lower energies., Comment: 9 pages, 8 figures, accepted for publication in Phys. Rev. C

Published
2003
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9. Measurements of ultracold neutron lifetimes in solid deuterium

Author

Morris, C. L., Anaya, J. M., Bowles, T. J., Filippone, B. W., Geltenbort, P., Hill, R. E., Hino, M., Hoedl, S., Hogan, G. E., Ito, T. M., Kawai, T., Kirch, K., Lamoreaux, S. K., Liu, C. -Y., Makela, M., Marek, L. J., Martin, J. W., Mortensen, R. N., Pichlmaier, A., Saunders, A., Seestrom, S. J., Smith, D., Teasdale, W., Tipton, B., Utsuro, M., Young, A. R., and Yuan, J.

Subjects
Nuclear Experiment
Abstract

We present the first measurements of the survival time of ultracold neutrons (UCNs) in solid deuterium SD2. This critical parameter provides a fundamental limitation to the effectiveness of superthermal UCN sources that utilize solid ortho-deuterium as the source material. Superthermal UCN sources offer orders of magnitude improvement in the available densities of UCNs, and are of great importance to fundamental particle-physics experiments such as searches for a static electric dipole moment and lifetime measurements of the free neutron. These measurements are performed utilizing a SD2 source coupled to a spallation source of neutrons, providing a demonstration of UCN production in this geometry and permitting systematic studies of the influence of thermal up-scatter and contamination with para-deuterium on the UCN survival time., Comment: 5 pages, 3 figures, revtex4

Published
2001
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11. Pannikulitis

Author

Hödl, S., Kerl, Helmut, editor, Garbe, Claus, editor, Cerroni, Lorenzo, editor, and Wolff, Helmut H., editor

Published
2003
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12. Short-range fundamental forces

Author

Antoniadis, I., Baessler, S., Büchner, M., Fedorov, V.V., Hoedl, S., Lambrecht, A., Nesvizhevsky, V.V., Pignol, G., Protasov, K.V., Reynaud, S., and Sobolev, Yu.

Published
2011
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19. Heutiger Stand der histologischen und immunhistochemischen Diagnostik des malignen Melanoms

Author

Kerl, Helmut, Smolle, J., Rroni, L. Ci, Soyer, H. P., Hödl, S., Braun-Falco, O., editor, Petzoldt, D., editor, Schnyder, U. W., editor, Wolff, K., editor, Burg, G., editor, Christophers, E., editor, Happle, R., editor, Orfanos, C. E., editor, Plewig, G., editor, Schöpft, E., editor, Marghescu, Sandor, editor, Lubach, Dietrich, editor, and Neumann, Christine, editor

Published
1991
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24. Final results for the neutron β-asymmetry parameter A₀ from the UCNA experiment

Author

Plaster, B., Adamek, E., Allgeier, B., Anaya, J., Back, H. O., Bagdasarova, Y., Berguno, D. B., Blatnik, M., Boissevain, J. G., Bowles, T. J., Broussard, L. J., Brown, M. A.-P., Carr, R., Clark, D. J., Clayton, S., Cude-Woods, C., Currie, S., Dees, E. B., Ding, X., Du, S., Filippone, B. W., García, A., Geltenbort, P., Hasan, S., Hawari, A., Hickerson, K. P., Hill, R., Hino, M., Hoagland, J., Hoedl, S. A., Hogan, G. E., Hona, B., Hong, R., Holley, A. T., Ito, T. M., Kawai, T., Kirch, K., Kitagaki, S., Knecht, A., Lamoreaux, S. K., Liu, C.-Y., Liu, J., Makela, M., Mammei, R. R., Martin, J. W., Meier, N., Melconian, D., Mendenhall, M. P., Moore, S. D., Morris, C. L., Mortensen, R., Nepal, S., Nouri, N., Pattie, R. W., Pérez Galván, A., Phillips II, D. G., Pichlmaier, A., Picker, R., Pitt, M. L., Ramsey, J. C., Rios, R., Russell, R., Sabourov, K., Sallaska, A. L., Salvat, D. J., Saunders, A., Schmid, R., Seestrom, S. J., Servicky, C., Sharapov, E. I., Sjue, S. K. L., Slutsky, S., Smith, D., Sondheim, W. E., Sun, X., Swank, C., Swift, G., Tatar, E., Teasdale, W., Terai, C., Tipton, B., Utsuro, M., Vogelaar, R. B., VornDick, B., Wang, Z., Wehring, B., Wexler, J., Womack, T., Wrede, C., Xu, Y. P., Yan, H., Young, A. R., Yuan, J., and Zeck, B. A.

Subjects
Physics::Instrumentation and Detectors, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The UCNA experiment was designed to measure the neutron β-asymmetry parameter A0 using polarized ultracold neutrons (UCN). UCN produced via downscattering in solid deuterium were polarized via transport through a 7 T magnetic field, and then directed to a 1 T solenoidal electron spectrometer, where the decay electrons were detected in electron detector packages located on the two ends of the spectrometer. A value for A0 was then extracted from the asymmetry in the numbers of counts in the two detector packages. We summarize all of the results from the UCNA experiment, obtained during run periods in 2007, 2008–2009, 2010, and 2011–2013, which ultimately culminated in a 0.67% precision result for A₀.

Published
2019

27. An electron transparent proton detector for neutron decay studies.

Author

Hoedl, S. A., Young, A. R., Ade, H., and Lozano, A.

Subjects
*PROTONS, *DETECTORS, *ELECTRONS, *PROTON accelerators, *NUCLEAR physics
Abstract

We have developed an ultrathin (<100 nm), very strong polyimide foil which can span more than 6×6 cm2 and is ideal for the fabrication of low energy proton detectors. We have produced a proton detector geometry in which protons incident on the foil with kinetic energies greater than about 25 keV produce, on average, more than ten secondary electrons in a conversion crystal evaporated on the back face of the foil. These secondary electrons can be “postaccelerated” and counted in a variety of detectors. The polyimide foils are much more durable than carbon foils previously used in similar detection geometries. LiF was chosen as the conversion crystal, which is relatively insensitive to exposure to air, improving their secondary electron yield under typical operating conditions. In addition, we describe the operation of a very simple, small scale proton accelerator and detector testing chamber capable of providing up to 10 kHz of beam with energies between 10 and 50 keV onto a biased target with a maximum ion contamination of 0.5%. [ABSTRACT FROM AUTHOR]

Published
2006
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29. Short-range fundamental forces. Forces fondamentales à courte portée

Author

Antoniadis, I., Baessler, S., Büchner, Matthias, Fedorov, V.V., Hoedl, S., Lambrecht, A., Nesvizhevsky, V.V., Pignol, G., Protasov, K.V., Reynaud, S., Sobolev, Yu., Interférométrie (LCAR), Laboratoire Collisions Agrégats Réactivité (LCAR), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Kastler Brossel (LKB (Jussieu)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), GRANIT, Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2010
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30. Electron-capture branch of Tc-100 and tests of nuclear wave functions for double-beta decays

Author

Sjue, S. K. L., Melconian, D., García, Alejandro, Ahmad, I., Algora, Alejandro, Äystö, J., Elomaa, V.-V., Eronen, T., Hakala, J., Hoedl, S., Kankainen, A., Kessler, T., Moore, Iain D., Naab, F., Penttilä, H., Rahaman, S., Saastamoinen, A., Swanson, H. E., Weber, C., Triambak, S., and Deryckx, K.

Subjects
Física
Abstract

We present a measurement of the electron-capture branch of 100Tc. Our value, B(EC)=(2.6±0.4)×10−5, implies that the 100Mo neutrino absorption cross section to the ground state of 100Tc is roughly one third larger than previously thought. Compared to previous measurements, our value of B(EC) prevents a smaller disagreement with QRPA calculations relevant to double-β decay matrix elements.

Published
2008

31. LP6: Ictal tachycardia in childhood epilepsy

Author

Carrette, S., primary, Carrette, E., additional, Gadeyne, S., additional, Dauwe, I., additional, Meurs, A., additional, De Herdt, V., additional, Goossens, L., additional, Hoedl, S., additional, Boon, P., additional, and Vonck, K., additional

Published
2014
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32. Performance of the Los Alamos National Laboratory spallation-driven solid-deuterium ultra-cold neutron source

Author

Physics, Saunders, A., Makela, M., Bagdasarova, Y., Back, H. O., Boissevain, J. G., Broussard, L. J., Bowles, T. J., Carr, Rachel E., Currie, S. A., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hill, R. E., Hoagland, J., Hoedl, S. A., Holley, A. T., Hogan, G., Ito, T. M., Lamoreaux, Steve, Liu, Chen-Yu, Liu, J., Mammei, R. R., Martin, J., Melconian, D., Mendenhall, M. P., Morris, C. L., Mortensen, R. N., Pattie, R. W., Jr., Pitt, M., Plaster, B., Ramsey, J., Rios, R., Sallaska, A. L., Seestrom, S. J., Sharapov, E. I., Sjue, S., Sondheim, W. E., Teasdale, W., Young, A. R., VornDick, B., Vogelaar, R. Bruce, Wang, Z., Xu, Yanping, Physics, Saunders, A., Makela, M., Bagdasarova, Y., Back, H. O., Boissevain, J. G., Broussard, L. J., Bowles, T. J., Carr, Rachel E., Currie, S. A., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hill, R. E., Hoagland, J., Hoedl, S. A., Holley, A. T., Hogan, G., Ito, T. M., Lamoreaux, Steve, Liu, Chen-Yu, Liu, J., Mammei, R. R., Martin, J., Melconian, D., Mendenhall, M. P., Morris, C. L., Mortensen, R. N., Pattie, R. W., Jr., Pitt, M., Plaster, B., Ramsey, J., Rios, R., Sallaska, A. L., Seestrom, S. J., Sharapov, E. I., Sjue, S., Sondheim, W. E., Teasdale, W., Young, A. R., VornDick, B., Vogelaar, R. Bruce, Wang, Z., and Xu, Yanping

Abstract

In this paper, we describe the performance of the Los Alamos spallation-driven solid-deuterium ultra-cold neutron (UCN) source. Measurements of the cold neutron flux, the very low energy neutron production rate, and the UCN rates and density at the exit from the biological shield are presented and compared to Monte Carlo predictions. The cold neutron rates compare well with predictions from the Monte Carlo code MCNPX and the UCN rates agree with our custom UCN Monte Carlo code. The source is shown to perform as modeled. The maximum delivered UCN density at the exit from the biological shield is 52(9) UCN/cc with a solid deuterium volume of similar to 1500 cm(3). (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4770063]

Published
2013

33. First Measurement of the Neutron beta Asymmetry with Ultracold Neutrons

Author

Physics, Pattie, R. W., Anaya, J., Back, H. O., Boissevain, J. G., Bowles, T. J., Broussard, L. J., Carr, Rachel E., Clark, D. J., Currie, S., Du, S., Filippone, B. W., Geltenbort, P., Garcia, A., Hawari, A., Hickerson, K. P., Hill, R., Hino, M., Hoedl, S. A., Hogan, G. E., Holley, A. T., Ito, T. M., Kawai, T., Kirch, K., Kitagaki, S., Lamoreaux, S. K., Liu, C. Y., Liu, J., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Meier, N., Mendenhall, M. P., Morris, C. L., Mortensen, R., Pichlmaier, A., Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Sabourov, K., Sallaska, A. L., Saunders, A., Schmid, R., Seestrom, S. J., Servicky, C., Sjue, S. K. L., Smith, D., Sondheim, W. E., Tatar, E., Teasdale, W., Terai, C., Tipton, B., Utsuro, M., Vogelaar, R. Bruce, Wehring, B. W., Xu, Y. P., Young, A. R., Yuan, J., Ucna Collaboration, Physics, Pattie, R. W., Anaya, J., Back, H. O., Boissevain, J. G., Bowles, T. J., Broussard, L. J., Carr, Rachel E., Clark, D. J., Currie, S., Du, S., Filippone, B. W., Geltenbort, P., Garcia, A., Hawari, A., Hickerson, K. P., Hill, R., Hino, M., Hoedl, S. A., Hogan, G. E., Holley, A. T., Ito, T. M., Kawai, T., Kirch, K., Kitagaki, S., Lamoreaux, S. K., Liu, C. Y., Liu, J., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Meier, N., Mendenhall, M. P., Morris, C. L., Mortensen, R., Pichlmaier, A., Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Sabourov, K., Sallaska, A. L., Saunders, A., Schmid, R., Seestrom, S. J., Servicky, C., Sjue, S. K. L., Smith, D., Sondheim, W. E., Tatar, E., Teasdale, W., Terai, C., Tipton, B., Utsuro, M., Vogelaar, R. Bruce, Wehring, B. W., Xu, Y. P., Young, A. R., Yuan, J., and Ucna Collaboration

Abstract

We report the first measurement of an angular correlation parameter in neutron beta decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for similar to 30 s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with a static 7 T field external to the decay volume provides a 420 neV potential energy barrier to the spin state parallel to the field, polarizing the UCN before they pass through an adiabatic fast passage spin flipper and enter a decay volume, situated within a 1 T field in a 2 x 2 pi solenoidal spectrometer. We determine a value for the beta-asymmetry parameter A(0) = -0.1138 +/- 0.0046 +/- 0.0021.

Published
2009

34. New measurements and quantitative analysis of electron backscattering in the energy range of neutron beta-decay

Author

Martin, J. W., Yuan, J., Betancourt, M. J., Filippone, B. W., Hoedl, S. A., Ito, T. M., Plaster, B., Young, A. R., Martin, J. W., Yuan, J., Betancourt, M. J., Filippone, B. W., Hoedl, S. A., Ito, T. M., Plaster, B., and Young, A. R.

Abstract

We report on the first detailed measurements of electron backscattering from plastic scintillator targets, extending our previous work on beryllium and silicon targets. The scintillator experiment posed several additional experimental challenges associated with charging of the scintillator target, and those challenges are addressed in detail. In addition, we quantitatively compare the energy and angular distributions of this data, and our previous data, with electron transport simulations based on the GEANT4 and PENELOPE Monte Carlo simulation codes. The PENELOPE simulation is found globally to give a superior description of the data. Such information is crucial for a broad array of weak-interaction physics experiments, where electron backscattering can give rise to the dominant detector-related systematic uncertainty.

Published
2006

35. An electron transparent proton detector for neutron decay studies

Author

Department of Energy (US), National Science Foundation (US), Hoedl, S. A., Young, A. R., Ade, H., Lozano López, Ángel Emilio, Department of Energy (US), National Science Foundation (US), Hoedl, S. A., Young, A. R., Ade, H., and Lozano López, Ángel Emilio

Abstract

We have developed an ultrathin (<100 nm), very strong polyimide foil which can span more than 6×6 cm2 and is ideal for the fabrication of low energy proton detectors. We have produced a proton detector geometry in which protons incident on the foil with kinetic energies greater than about 25 keV produce, on average, more than ten secondary electrons in a conversion crystal evaporated on the back face of the foil. These secondary electrons can be "postaccelerated" and counted in a variety of detectors. The polyimide foils are much more durable than carbon foils previously used in similar detection geometries. LiF was chosen as the conversion crystal, which is relatively insensitive to exposure to air, improving their secondary electron yield under typical operating conditions. In addition, we describe the operation of a very simple, small scale proton accelerator and detector testing chamber capable of providing up to 10 kHz of beam with energies between 10 and 50 keV onto a biased target with a maximum ion contamination of 0.5%.

Published
2006

36. Performance of the Los Alamos National Laboratory spallation-driven solid-deuterium ultra-cold neutron source

Author

Saunders, A., primary, Makela, M., additional, Bagdasarova, Y., additional, Back, H. O., additional, Boissevain, J., additional, Broussard, L. J., additional, Bowles, T. J., additional, Carr, R., additional, Currie, S. A., additional, Filippone, B., additional, García, A., additional, Geltenbort, P., additional, Hickerson, K. P., additional, Hill, R. E., additional, Hoagland, J., additional, Hoedl, S., additional, Holley, A. T., additional, Hogan, G., additional, Ito, T. M., additional, Lamoreaux, Steve, additional, Liu, Chen-Yu, additional, Liu, J., additional, Mammei, R. R., additional, Martin, J., additional, Melconian, D., additional, Mendenhall, M. P., additional, Morris, C. L., additional, Mortensen, R. N., additional, Pattie, R. W., additional, Pitt, M., additional, Plaster, B., additional, Ramsey, J., additional, Rios, R., additional, Sallaska, A., additional, Seestrom, S. J., additional, Sharapov, E. I., additional, Sjue, S., additional, Sondheim, W. E., additional, Teasdale, W., additional, Young, A. R., additional, VornDick, B., additional, Vogelaar, R. B., additional, Wang, Z., additional, and Xu, Yanping, additional

Published
2013
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38. Clinical Features of 13 Patients with Parkinson's Disease Due to an Autosomal Dominant Mutation in the Vacuolar Protein Sorting-Associated Protein 35 (VPS35) (P01.211)

Author

Struhal, W., primary, Presslauer, S., additional, Spielberger, S., additional, Hoedl, S., additional, Schmidegg, S., additional, Wolf, E., additional, Seppi, K., additional, Zimprich, A., additional, Tomantschger, V., additional, Auff, E., additional, Bruecke, T., additional, Poewe, W., additional, and Ransmayr, G., additional

Published
2012
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39. Demonstration of a solid deuterium source of ultra-cold neutrons

Author

Saunders, A, Anaya, JM, Bowles, TJ, Filippone, BW, Geltenbort, P, Hill, RE, Hino, M, Hoedl, S, Hogan, GE, Ito, TM, Jones, KW, Kawai, T, Kirch, K, Lamoreaux, SK, Liu, CY, Makela, M, Marek, LJ, Martin, JW, Morris, CL, Mortensen, RN, Pichlmaier, A, Seestrom, SJ, Serebrov, A, Smith, D, Teasdale, W, Tipton, B, Vogelaar, RB, Young, AR, Yuan, J, Saunders, A, Anaya, JM, Bowles, TJ, Filippone, BW, Geltenbort, P, Hill, RE, Hino, M, Hoedl, S, Hogan, GE, Ito, TM, Jones, KW, Kawai, T, Kirch, K, Lamoreaux, SK, Liu, CY, Makela, M, Marek, LJ, Martin, JW, Morris, CL, Mortensen, RN, Pichlmaier, A, Seestrom, SJ, Serebrov, A, Smith, D, Teasdale, W, Tipton, B, Vogelaar, RB, Young, AR, and Yuan, J

Published
2004

40. Demonstration of a solid deuterium source of ultra-cold neutrons

Author

70314292, Saunders, A, Anaya, JM, Bowles, TJ, Filippone, BW, Geltenbort, P, Hill, RE, Hino, M, Hoedl, S, Hogan, GE, Ito, TM, Jones, KW, Kawai, T, Kirch, K, Lamoreaux, SK, Liu, CY, Makela, M, Marek, LJ, Martin, JW, Morris, CL, Mortensen, RN, Pichlmaier, A, Seestrom, SJ, Serebrov, A, Smith, D, Teasdale, W, Tipton, B, Vogelaar, RB, Young, AR, Yuan, J, 70314292, Saunders, A, Anaya, JM, Bowles, TJ, Filippone, BW, Geltenbort, P, Hill, RE, Hino, M, Hoedl, S, Hogan, GE, Ito, TM, Jones, KW, Kawai, T, Kirch, K, Lamoreaux, SK, Liu, CY, Makela, M, Marek, LJ, Martin, JW, Morris, CL, Mortensen, RN, Pichlmaier, A, Seestrom, SJ, Serebrov, A, Smith, D, Teasdale, W, Tipton, B, Vogelaar, RB, Young, AR, and Yuan, J

Published
2004

42. Measurement of electron backscattering in the energy range of neutron beta decay

Author

Martin, J. W., Yuan, J., Hoedl, S. A., Filippone, B. W., Fong, D., Ito, T. M., Lin, E., Tipton, B., Young, A. R., Martin, J. W., Yuan, J., Hoedl, S. A., Filippone, B. W., Fong, D., Ito, T. M., Lin, E., Tipton, B., and Young, A. R.

Abstract

We report on the first detailed measurements of electron backscattering from low Z targets at energies up to 124 keV. Both energy and angular distributions of the backscattered electrons are measured and compared with electron transport simulations based on the Geant4 and Penelope Monte Carlo simulation codes. Comparisons are also made with previous, less extensive, measurements and with measurements at lower energies.

Published
2003

43. Measurements of Ultracold-Neutron Lifetimes in Solid Deuterium

Author

Morris, C. L., Anaya, J.M., Bowles, T. J., Filippone, B.W., Geltenbort, P., Hill, R. E., Hino, M., Hoedl, S., Hogan, E., Ito, T. M., Kawai, T., Kirch, K., Lamoreaux, S. K., Liu, C.-Y., Makela, M., Marek, L. J., Martin, J.W., Mortensen, N., Pichlmaier, A., Saunders, A., Seestrom, S. J., Smith, D., Teasdale, W., Tipton, B., Utsuro, M., Young, A. R., Yuan, J., Morris, C. L., Anaya, J.M., Bowles, T. J., Filippone, B.W., Geltenbort, P., Hill, R. E., Hino, M., Hoedl, S., Hogan, E., Ito, T. M., Kawai, T., Kirch, K., Lamoreaux, S. K., Liu, C.-Y., Makela, M., Marek, L. J., Martin, J.W., Mortensen, N., Pichlmaier, A., Saunders, A., Seestrom, S. J., Smith, D., Teasdale, W., Tipton, B., Utsuro, M., Young, A. R., and Yuan, J.

Abstract

We present the first measurements of the survival time of ultracold neutrons (UCNs) in solid deuterium (SD2). This critical parameter provides a fundamental limitation to the effectiveness of superthermal UCN sources that utilize solid ortho-deuterium as the source material. These measurements are performed utilizing a SD2 source coupled to a spallation source of neutrons, providing a demonstration of UCN production in this geometry and permitting systematic studies of the influence of thermal up-scatter and contamination with para-deuterium on the UCN survival time.

Published
2002

44. Measurements of ultracold-neutron lifetimes in solid deuterium

Author

70314292, Morris, CL, Anaya, JM, Bowles, TJ, Filippone, BW, Geltenbort, P, Hill, RE, Hino, M, Hoedl, S, Hogan, GE, Ito, TM, Kawai, T, Kirch, K, Lamoreaux, SK, Liu, CY, Makela, M, Marek, LJ, Martin, JW, Mortensen, RN, Pichlmaier, A, Saunders, A, Seestrom, SJ, Smith, D, Teasdale, W, Tipton, B, Utsuro, M, Young, AR, Yuan, J, 70314292, Morris, CL, Anaya, JM, Bowles, TJ, Filippone, BW, Geltenbort, P, Hill, RE, Hino, M, Hoedl, S, Hogan, GE, Ito, TM, Kawai, T, Kirch, K, Lamoreaux, SK, Liu, CY, Makela, M, Marek, LJ, Martin, JW, Mortensen, RN, Pichlmaier, A, Saunders, A, Seestrom, SJ, Smith, D, Teasdale, W, Tipton, B, Utsuro, M, Young, AR, and Yuan, J

Published
2002

45. First Measurement of the NeutronβAsymmetry with Ultracold Neutrons

Author

Pattie, R. W., primary, Anaya, J., additional, Back, H. O., additional, Boissevain, J. G., additional, Bowles, T. J., additional, Broussard, L. J., additional, Carr, R., additional, Clark, D. J., additional, Currie, S., additional, Du, S., additional, Filippone, B. W., additional, Geltenbort, P., additional, García, A., additional, Hawari, A., additional, Hickerson, K. P., additional, Hill, R., additional, Hino, M., additional, Hoedl, S. A., additional, Hogan, G. E., additional, Holley, A. T., additional, Ito, T. M., additional, Kawai, T., additional, Kirch, K., additional, Kitagaki, S., additional, Lamoreaux, S. K., additional, Liu, C.-Y., additional, Liu, J., additional, Makela, M., additional, Mammei, R. R., additional, Martin, J. W., additional, Melconian, D., additional, Meier, N., additional, Mendenhall, M. P., additional, Morris, C. L., additional, Mortensen, R., additional, Pichlmaier, A., additional, Pitt, M. L., additional, Plaster, B., additional, Ramsey, J. C., additional, Rios, R., additional, Sabourov, K., additional, Sallaska, A. L., additional, Saunders, A., additional, Schmid, R., additional, Seestrom, S., additional, Servicky, C., additional, Sjue, S. K. L., additional, Smith, D., additional, Sondheim, W. E., additional, Tatar, E., additional, Teasdale, W., additional, Terai, C., additional, Tipton, B., additional, Utsuro, M., additional, Vogelaar, R. B., additional, Wehring, B. W., additional, Xu, Y. P., additional, Young, A. R., additional, and Yuan, J., additional

Published
2009
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46. Electron-capture branch ofTc100and tests of nuclear wave functions for double-βdecays

Author

Sjue, S. K. L., primary, Melconian, D., additional, García, A., additional, Ahmad, I., additional, Algora, A., additional, Äystö, J., additional, Elomaa, V.-V., additional, Eronen, T., additional, Hakala, J., additional, Hoedl, S., additional, Kankainen, A., additional, Kessler, T., additional, Moore, I. D., additional, Naab, F., additional, Penttilä, H., additional, Rahaman, S., additional, Saastamoinen, A., additional, Swanson, H. E., additional, Weber, C., additional, Triambak, S., additional, and Deryckx, K., additional

Published
2008
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47. A New Solid Deuterium Source of Ultra-Cold Neutrons

Author

Wender, S., Saunders, A., Bowles, T., Hill, R., Hogan, G., Lamoreaux, S., Marek, L., Morris, C. L., Seestrom, S., Teasdale, W., Smith, D. A., Liu, C.-Y., Hoedl, S., Young, A., Filippone, B. W., Ito, T. M., Yuan, J., Geltenbort, P., Wender, S., Saunders, A., Bowles, T., Hill, R., Hogan, G., Lamoreaux, S., Marek, L., Morris, C. L., Seestrom, S., Teasdale, W., Smith, D. A., Liu, C.-Y., Hoedl, S., Young, A., Filippone, B. W., Ito, T. M., Yuan, J., and Geltenbort, P.

Abstract

In polarized neutron decay, the angular correlation between the neutron spin and the direction of emission of the electron is characterized by the coefficient A. Measuring A involves determining the forward-backward asymmetry of the decay beta with respect to the direction of the neutron polarization. The value of A, when combined with measurements of the neutron lifetime, determines the values of the vector and axial vector weak coupling constants, Gv and GA. The value of Gv can also be determined by measurements of superallowed nuclear beta decay and by requiring that the Cabibo-Kobayashi-Maskawi (CKM) mixing matrix be unitary along with the measured value of other elements of the CKM matrix.

Published
2000

48. A proposed measurement of the ß asymmetry in neutron decay with the Los Alamos Ultra-Cold Neutron Source

Author

Thomas, A. W., Guo, Xin-Heng, Williams, A. G., Tipton, B., Alduschenkov, A., Asahi, K., Bowles, T., Filippone, B. W., Fowler, M., Geltenbort, P., Hartmann, F., Hill, R., Hime, A., Hino, M., Hoedl, S., Hogan, G., Ito, T. M., Jones, C., Kawai, T., Kharitonov, A., Kirch, K., Kitagaki, T., Lamoreaux, S., Lassakov, M., Liu, C-Y., Makela, M., Martin, J., McKeown, R., Morris, C., Pichlmaier, A., Pitt, M., Rudnev, Yu., Saunders, A., Seestrom, S., Serebrov, A., Smith, D., Soyama, K., Utsuro, M., Vasilev, A., Vogelaar, B., Walstrom, P., Wilhelmy, J., Young, A. R., Yuan, J., Thomas, A. W., Guo, Xin-Heng, Williams, A. G., Tipton, B., Alduschenkov, A., Asahi, K., Bowles, T., Filippone, B. W., Fowler, M., Geltenbort, P., Hartmann, F., Hill, R., Hime, A., Hino, M., Hoedl, S., Hogan, G., Ito, T. M., Jones, C., Kawai, T., Kharitonov, A., Kirch, K., Kitagaki, T., Lamoreaux, S., Lassakov, M., Liu, C-Y., Makela, M., Martin, J., McKeown, R., Morris, C., Pichlmaier, A., Pitt, M., Rudnev, Yu., Saunders, A., Seestrom, S., Serebrov, A., Smith, D., Soyama, K., Utsuro, M., Vasilev, A., Vogelaar, B., Walstrom, P., Wilhelmy, J., Young, A. R., and Yuan, J.

Abstract

This article reviews the status of an experiment to study the neutron spin-electron angular correlation with the Los Alamos Ultra-Cold Neutron (UCN) source. The experiment will generate UCNs from a novel solid deuterium, spallation source, and polarize them in a solenoid magnetic field. The experiment spectrometer will consist of a neutron decay region in a solenoid magnetic field combined with several different detector possibilities. An electron beam and a magnetic spectrometer will provide a precise, absolute calibration for these detectors. An A-correlation measurement with a relative precision of 0.2% is expected by the end of 2002.

Published
2000

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