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31 results on '"Alford WP"'

1. Quasifree polarization-transfer measurements in the (p→,n→) reaction at 495 MeV

Author

W. Huang, J. Rapaport, J. B. McClelland, David L. Prout, T. N. Taddeucci, W.C. Sailor, R.C. Byrd, D. Marchlenski, C. D. Goodman, Yan Alexander Wang, T. A. Carey, Rybaryck Lj, B. A. Luther, Alford Wp, Mercer Dj, C. A. Whitten, DeLucia S, X. Y. Chen, E. Gülmez, and E. Sugarbaker

Subjects
Physics, Nuclear reaction, Scattering, Momentum transfer, General Physics and Astronomy, Neutron, Born approximation, Atomic physics, Inelastic scattering, Polarization (waves), Random phase approximation
Abstract

A complete set of polarization transfer observables for quasifree scattering in the ({rvec p}, {rvec n}) reaction at 495 MeV is reported. Measurements were carried out on CD{sub 2}, natural carbon, and calcium targets at a momentum transfer of 1.72 fm{sup {minus}1} using the new Neutron Time-of-Flight facility at LAMPF. The spin-longitudinal and spin-transverse responses are extracted from the data. The ratio of these responses are compared to DWIA-RPA calculations in which the particle-hole interaction is taken to be of the form g{prime}+{pi}+{rho}. No evidence for these RPA correlations is seen in the data at this momentum transfer. 8 refs., 2 figs.

Published
1992
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2. Novel search for heavy nu mixing from the beta(+) decay of K-38m confined in an atom trap

Author

UCL, Trinczek, M, Gorelov, A., Melconian, D., Alford, WP, Asgeirsson, D, Ashery, D., Behr, JA, Bricault, PG, D'Auria, JM, Deutsch, Jules, Dilling, J., Dombsky, M., Dube, P., Eaton, S, Fingler, J, Giesen, U, Gu, S, Hausser, O, Jackson, KP, Lee, B., Schmid, JH, Stocki, TJ, Swanson, TB, Wong, W, UCL, Trinczek, M, Gorelov, A., Melconian, D., Alford, WP, Asgeirsson, D, Ashery, D., Behr, JA, Bricault, PG, D'Auria, JM, Deutsch, Jules, Dilling, J., Dombsky, M., Dube, P., Eaton, S, Fingler, J, Giesen, U, Gu, S, Hausser, O, Jackson, KP, Lee, B., Schmid, JH, Stocki, TJ, Swanson, TB, and Wong, W

Abstract

A new technique, full neutrino momentum reconstruction, is used to set limits on the admixture of heavy neutrinos into the electron neutrino. We measure coincidences between nuclear recoils and positrons from the beta decay of trapped radioactive atoms and deduce the neutrino momentum. A search for peaks in the reconstructed recoil time-of-flight spectrum as a function of positron energy is performed. The admixture upper limits range from 4x10(-3) to 2x10(-2) and are the best direct limits for neutrinos (as opposed to antineutrinos) for the mass region of 0.7 to 3.5 MeV.

Published
2003

3. Beta-neutrino correlation experiments on laser trapped K-38m, K-37

Author

UCL - Autre, Gorelov, A., Behr, JA, Melconian, D., Trinczek, M, Dube, P., Hausser, O, Giesen, U, Jackson, KP, Swanson, T, D'Auria, JM, Dombsky, M., Ball, G., Buchmann, L., Jennings, B, Dilling, J., Schmid, J, Ashery, D., Deutsch, Jules, Alford, WP, Asgeirsson, D, Wong, W, Lee, B., 1st Euroconference on Atomic Physics at Accelerators (APAC 99), UCL - Autre, Gorelov, A., Behr, JA, Melconian, D., Trinczek, M, Dube, P., Hausser, O, Giesen, U, Jackson, KP, Swanson, T, D'Auria, JM, Dombsky, M., Ball, G., Buchmann, L., Jennings, B, Dilling, J., Schmid, J, Ashery, D., Deutsch, Jules, Alford, WP, Asgeirsson, D, Wong, W, Lee, B., and 1st Euroconference on Atomic Physics at Accelerators (APAC 99)

Abstract

Laser trapping and cooling techniques are now being applied to the study of nuclear beta-decay at several labs. A magneto-optical trap (MOT) provides a localized source of atoms suspended in space, so the low-energy recoiling nuclei can freely escape and be detected in coincidence with the beta. This allows reconstruction of the neutrino momentum, and the deduction of the beta-nu correlation in a more direct fashion than previously possible. In addition, the nuclei can be polarized by atomic techniques, opening a new class of spin-correlation measurements to test the degree to which parity is maximally violated in the weak interaction. Our present experiment has detected several hundred thousand recoil-beta(+) coincidences from the 0(+) --> 0(+) pure Fermi decay of K-38m, produced at the on-line isotope separators TISOL and ISAC at TRIUMF. Our goal is to set constraints on non-Standard Model scalar bosons competitive with high-energy colliders and more conventional beta-nu correlation experiments.

Published
2000

4. Advancing disability-inclusive climate research and action, climate justice, and climate-resilient development.

Author

Stein PJS, Stein MA, Groce N, Kett M, Akyeampong EK, Alford WP, Chakraborty J, Daniels-Mayes S, Eriksen SH, Fracht A, Gallegos L, Grech S, Gurung P, Hans A, Harpur P, Jodoin S, Lord JE, Macanawai SS, McClain-Nhlapo CV, Mezmur BD, Moore RJ, Muñoz Y, Patel V, Pham PN, Quinn G, Sadlier SA, Shachar C, Smith MS, and Van Susteren L

Subjects
Humans, Human Rights, Mental Health, Climate Change, Resilience, Psychological, Persons with Disabilities
Abstract

Globally, more than 1 billion people with disabilities are disproportionately and differentially at risk from the climate crisis. Yet there is a notable absence of climate policy, programming, and research at the intersection of disability and climate change. Advancing climate justice urgently requires accelerated disability-inclusive climate action. We present pivotal research recommendations and guidance to advance disability-inclusive climate research and responses identified by a global interdisciplinary group of experts in disability, climate change, sustainable development, public health, environmental justice, humanitarianism, gender, Indigeneity, mental health, law, and planetary health. Climate-resilient development is a framework for enabling universal sustainable development. Advancing inclusive climate-resilient development requires a disability human rights approach that deepens understanding of how societal choices and actions-characterised by meaningful participation, inclusion, knowledge diversity in decision making, and co-design by and with people with disabilities and their representative organisations-build collective climate resilience benefiting disability communities and society at large while advancing planetary health., Competing Interests: Declaration of interests We declare no competing interests., (Copyright © 2024 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY-NC-ND 4.0 license. Published by Elsevier Ltd.. All rights reserved.)

Published
2024
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5. Scalar interaction limits from the beta-nu correlation of trapped radioactive atoms.

Author

Gorelov A, Melconian D, Alford WP, Ashery D, Ball G, Behr JA, Bricault PG, D'Auria JM, Deutsch J, Dilling J, Dombsky M, Dubé P, Fingler J, Giesen U, Glück F, Gu S, Häusser O, Jackson KP, Jennings BK, Pearson MR, Stocki TJ, Swanson TB, and Trinczek M

Abstract

We have set limits on contributions of scalar interactions to nuclear beta decay. A magneto-optical trap provides a localized source of atoms suspended in space, so the low-energy recoiling nuclei can freely escape and be detected in coincidence with the beta. This allows reconstruction of the neutrino momentum, and the measurement of the beta-nu correlation, in a more direct fashion than previously possible. The beta-nu correlation parameter of the 0(+)-->0(+) pure Fermi decay of (38)K(m) is a =0.9981+/-0.0030+0.0032 / -0.0037, consistent with the standard model prediction a =1.

Published
2005
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6. Novel search for heavy nu mixing from the beta+ decay of 38mK confined in an atom trap.

Author

Trinczek M, Gorelov A, Melconian D, Alford WP, Asgeirsson D, Ashery D, Behr JA, Bricault PG, D'Auria JM, Deutsch J, Dilling J, Dombsky M, Dubé P, Eaton S, Fingler J, Giesen U, Gu S, Häusser O, Jackson KP, Lee B, Schmid JH, Stocki TJ, Swanson TB, and Wong W

Abstract

A new technique, full neutrino momentum reconstruction, is used to set limits on the admixture of heavy neutrinos into the electron neutrino. We measure coincidences between nuclear recoils and positrons from the beta decay of trapped radioactive atoms and deduce the neutrino momentum. A search for peaks in the reconstructed recoil time-of-flight spectrum as a function of positron energy is performed. The admixture upper limits range from 4 x 10(-3) to 2 x 10(-2) and are the best direct limits for neutrinos (as opposed to antineutrinos) for the mass region of 0.7 to 3.5 MeV.

Published
2003
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13. Polarization transfer in quasifree ( p

Author

Chen XY, Taddeucci TN, McClelland JB, Carey TA, Byrd RC, Rybarcyk LJ, Sailor WC, Mercer DJ, Prout DL, DeLucia S, Luther B, Marchlenski DG, Sugarbaker E, Rapaport J, Gülmez E, Whitten CA Jr, Goodman CD, Huang W, Wang Y, and Alford WP

Published
1993
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29. The structure of tubes of bovine rotavirus nucleocapsid protein (VP6) assembled in vitro.

Author

Ready KF, Buko KM, Whippey PW, Alford WP, and Bancroft JB

Subjects
Animals, Capsid ultrastructure, Cattle, Cell Line, Computer Simulation, Microscopy, Electron, Models, Chemical, Rotavirus analysis, Ultracentrifugation, Viral Core Proteins ultrastructure, X-Ray Diffraction, Capsid analysis, Rotavirus ultrastructure, Viral Core Proteins analysis
Abstract

The structure of tubes of reassembled nucleocapsid protein (VP6) from bovine rotavirus (BRV) was determined using optical diffraction of electron micrographs. The tubes consist of a five-start helix of hexagons, with 38 hexagons per helix in a true repeat of three turns. The morphological subunits comprising the hexagons are probably elongated trimers. The structure of naturally occurring tubes (D. Chasey and J. Labram, 1983, J. Gen. Virol. 64, 863-872) was also examined and shown to be similar but not identical to that of tubes assembled in vitro. Considerations of the assembly process are discussed.

Published
1988
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