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Your search keyword '"Kleppner, D."' showing total 139 results
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139 results on '"Kleppner, D."'

1. Magnetic trapping of silver and copper, and anomolous spin relaxation in the Ag-He system

Author

Brahms, N., Newman, B., Johnson, C., Greytak, T., Kleppner, D., and Doyle, J.

Subjects
Physics - Atomic Physics
Abstract

We have trapped large numbers of copper and silver atoms using buffer gas cooling. Up to 3x10^12 copper atoms and 4x10^13 silver atoms are trapped. Lifetimes are as long as 5 s, limited by collisions with the buffer gas. Ratios of elastic to inelastic collision rates with He are >~ 10^6, suggesting copper and silver are favorable for use in ultracold applications. The temperature dependence of the silver-helium-3 collision rate varies as T^5.8. We find that this temperature dependence is inconsistent with the behavior predicted for relaxation arising from the spin-rotation interaction, and conclude that the silver-helium-3 system displays anomalous collisional behavior in the multiple-partial wave regime. Lifetimes of laser ablated gold in helium-3 buffer gas are too short to permit trapping., Comment: 4 pages, 4 figures

Published
2008
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2. Antihydrogen Production and Precision Spectroscopy with ATHENA/AD-1

Author

Amsler, C., Bendiscioli, G., Bonomi, G., Bowe, P., Carraro, C., Cesar, C. L., Charlton, M., Collier, M. J. T., Doser, M., Fine, K., Fontana, A., Fujiwara, M. C., Funakoshi, R., Hangst, J., Hayano, R. S., Higaki, H., Holzscheiter, M. H., Joffrain, W., Jøergensen, L. V., Kleppner, D., Lagomarsino, V., Landua, R., Lindelof, D., Lodi-Rizzini, E., Macri, M., Manuzio, D., Manuzio, G., Marchesotti, M., Montagna, P., Pruys, H., Regenfus, C., Riedler, P., Rotondi, A., Rouleau, G., Testera, G., Watson, T. L., van der Werf, D. P., Yamazaki, T., Yamazaki, Y., Beig, R., editor, Ehlers, J., editor, Frisch, U., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Kippenhahn, R., editor, Lipowsky, R., editor, Löhneysen, H. v., editor, Ojima, I., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Karshenboim, Savely G., editor, Bassani, F., editor, Pavone, F.S., editor, Inguscio, M., editor, and Hänsch, T.W., editor

Published
2001
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3. Antihydrogen Production and Precision Spectroscopy with ATHENA/AD-1

Author

Amsler, C., primary, Bendiscioli, G., additional, Bonomi, G., additional, Bowe, P., additional, Carraro, C., additional, Cesar, C. L., additional, Charlton, M., additional, Collier, M. J. T., additional, Doser, M., additional, Fine, K., additional, Fontana, A., additional, Fujiwara, M. C., additional, Funakoshi, R., additional, Hangst, J., additional, Hayano, R. S., additional, Higaki, H., additional, Holzscheiter, M. H., additional, Joffrain, W., additional, Jøergensen, L. V., additional, Kleppner, D., additional, Lagomarsino, V., additional, Landua, R., additional, Lindelof, D., additional, Lodi-Rizzini, E., additional, Macri, M., additional, Manuzio, D., additional, Manuzio, G., additional, Marchesotti, M., additional, Montagna, P., additional, Pruys, H., additional, Regenfus, C., additional, Riedler, P., additional, Rotondi, A., additional, Rouleau, G., additional, Testera, G., additional, Watson, T. L., additional, van der Werf, D. P., additional, Yamazaki, T., additional, and Yamazaki, Y., additional

Published
2001
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9. The ATHENA antihydrogen experiment

Author

Amsler C., Bollen G., Cantone A., Carlberg C. B., Cesar C. L., Charlton M., Collier M. J. T., Doser M., Eades J., Ekloew N. A., Fine K. S., Fontana A., Fritioff T., Gemme G., Gorini G., Hangst J. S., Hayano R., Hermes E., Holzscheiter M. H., JCrgensen L. V., Kleppner D., Lagomarsino V., Landua R., Lewis R. A., Lodi Rizzini E., Macri M., Manuzio G., Marchesotti M., Merrison J. P., Pruys H., Regenfus C., Riedler P., Rotondi A., Rouleau G., Salvini P., Schuch R. H., Smith G. A., Testera G., Torelli G., Uggerh~j E., Van der Werf D. P., Venturelli L., Yamazaki T., Yamazaki Y., ZaneUo D., Zwahlen M., FEDELE, RENATO, Amsler, C., Bollen, G., Cantone, A., Carlberg, C. B., Cesar, C. L., Charlton, M., Collier, M. J. T., Doser, M., Eades, J., Ekloew, N. A., Fedele, Renato, Fine, K. S., Fontana, A., Fritioff, T., Gemme, G., Gorini, G., Hangst, J. S., Hayano, R., Hermes, E., Holzscheiter, M. H., Jcrgensen, L. V., Kleppner, D., Lagomarsino, V., Landua, R., Lewis, R. A., Lodi Rizzini, E., Macri, M., Manuzio, G., Marchesotti, M., Merrison, J. P., Pruys, H., Regenfus, C., Riedler, P., Rotondi, A., Rouleau, G., Salvini, P., Schuch, R. H., Smith, G. A., Testera, G., Torelli, G., Uggerh~j, E., Van der Werf, D. P., Venturelli, L., Yamazaki, T., Yamazaki, Y., Zaneuo, D., and Zwahlen, M.

Subjects
Physics, Physics::General Physics, Particle physics, Trap for anti-protons, Large Hadron Collider, Anti-Hydrogen, Anti-hydrogen recombination rate, Particle accelerator, law.invention, Nuclear physics, Trap (computing), Physics::Plasma Physics, Antiproton, law, Antimatter, Physics::Atomic and Molecular Clusters, Physics::Accelerator Physics, Physics::Atomic Physics, Antihydrogen, Positron annihilation
Abstract

The ATHENA experiment is being built at CERN to produce and trap neutral antihydrogen. Here we give an overview of the plans to produce antihydrogen. The experiment must 1) trap the antiprotons produced by the CERN accelerators, 2) produce and trap positrons, 3) combine the two charge species into antihydrogen, and finally 4) detect the presence of the antihydrogen. In this paper we discuss how we intend to accomplish each of these steps. © 1999 American Institute of Physics. © 1999 American Institute of Physics

Published
1999

12. Turning Off the Vacuum

Author

Kleppner, D., Schawlow, Arthur L., editor, McKellar, A. Robert W., editor, Oka, Takeshi, editor, and Stoicheff, Boris P., editor

Published
1981
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13. Observation of nonstatistical ortho–para ratio in hydrogen recombination at low temperatures.

Author

Xiao, Y. M., Buchman, S., Pollack, L., Kleppner, D., and Greytak, T. J.

Subjects
CHEMICAL reactions, HYDROGEN, LOW temperatures
Abstract

We have demonstrated that the molecular hydrogen obtained from atomic recombination at 300 mK has nonstatistic ortho–para ratio. The ortho para conversion is less than 3% in the vibrational relaxation phase. We suggest that it is possible to carry out detailed comparison between calculations and measurements at conditions similar to our experiments. [ABSTRACT FROM AUTHOR]

Published
1992
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15. Memorandum: Progress report on the ATHENA experiment

Author

Amoretti, M, Amsler, Claude, Bendiscioli, G, Bonomi, G, Bouchta, A, Bowe, P, Carraro, C, Charlton, M, Collier, M, Doser, Michael, Filippini, V, Fontana, A, Fujiwara, M C, Funakoshi, R, Genova, P, Glauser, A, Grögler, D, Hangst, Jeffrey S, Hayano, R S, Higaki, H, Holzscheiter, M H, Jørgensen, L V, Kleppner, D, Lagomarsino, V, Landua, Rolf, Cesar, C L, Lindelöf, D, Lodi Rizzini, E, Macri, M, Madsen, N, Manuzio, G, Marchesotti, M, Montagna, P, Pruys, H S, Regenfus, C, Riedler, P, Rotondi, A, Rouleau, G, Salvini, P, Testera, G, Van der Werf, D P, Variola, A, Watson, T, Yamazaki, T, and Yamazaki, Y

Subjects
Detectors and Experimental Techniques
Published
2002

16. Memorandum to the SPSC : Progress report on the construction of the ATHENA apparatus

Author

Amsler, C, Bendiscioli, G, Bonomi, G, Bowe, P, Charlton, M, Collier, M, Doser, M, Fedele, R, Fine, K, Fontana, A, Fujiwara, M, Funakoshi, R, Gorini, G, Hangst, J, Hayano, R, Higaki, H, Holzscheiter, M H, Joffrain, W, Jorgensen, L, Kleppner, D, Lagomarsino, V, Landua, R, Cesar, C L, Lodi Rizzini, E, Macri, M, Manuzio, G, Marchesotti, M, Montagna, P, Pruys, H, Regenfus, C, Riedler, P, Rotondi, A, Rouleau, G, Salvini, P, Testera, G, Torelli, G, Van der Werf, D P, Watson, T, Yamazaki, Y, Zenoni, A, and Zwahlen, M

Subjects
Detectors and Experimental Techniques
Published
2000

17. Status on the Michigan???MIT ultra???cold polarized hydrogen jet target

Author

Randall Lab of Physics, University of Michigan, Ann Arbor, Michigan 48109???1120, Institute for High Energy Physics, RU???142284, Protvino, Russia, Physics Department, Liverpool University, P.O. Box 142, Liverpool, L693BX, Great Britain, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, Joint Institute for Nuclear Research, RU???141980, Dubna, Russia, Luppov, V. G., Blinov, B. B., Bywater, J. A., Chin, S., Churakov, V. V., Court, G. R., Kaufman, W. A., Kleppner, D., Krisch, A. D., Melnik, Yu. M., Muldavin, J. B., Nurushev, T. S., Price, J. S., Prudkoglyad, A. F., Raymond, R. S., Shutov, V. B., Stewart, J. A., Randall Lab of Physics, University of Michigan, Ann Arbor, Michigan 48109???1120, Institute for High Energy Physics, RU???142284, Protvino, Russia, Physics Department, Liverpool University, P.O. Box 142, Liverpool, L693BX, Great Britain, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, Joint Institute for Nuclear Research, RU???141980, Dubna, Russia, Luppov, V. G., Blinov, B. B., Bywater, J. A., Chin, S., Churakov, V. V., Court, G. R., Kaufman, W. A., Kleppner, D., Krisch, A. D., Melnik, Yu. M., Muldavin, J. B., Nurushev, T. S., Price, J. S., Prudkoglyad, A. F., Raymond, R. S., Shutov, V. B., and Stewart, J. A.

Abstract

Progress on the Mark???II ultra???cold polarized atomic hydrogen gas Jet target for the experiments NEPTUN???A and NEPTUN at UNK is presented. We describe the performance and the present status of different components of the jet.

Published
2011

18. Cold collision frequency shift of the 1S-2S transition in hydrogen

Author

Thomas Killian, Fried, D. G., Willmann, L., Landhuis, D., Moss, S. C., Greytak, T. J., Kleppner, D., and Precision Frontier

Subjects
Condensed Matter::Quantum Gases, SPECTROSCOPY, TRAPPED ATOMIC-HYDROGEN, Atomic Physics (physics.atom-ph), SCATTERING LENGTHS, FOS: Physical sciences, Physics::Atomic Physics, SPIN-EXCHANGE, Physics - Atomic Physics
Abstract

We have observed the cold collision frequency shift of the 1S-2S transition in trapped spin-polarized atomic hydrogen. We find $\Delta \nu_{1S-2S} = -3.8(8)\times 10^{-10} n Hz cm^3$, where $n$ is the sample density. From this we derive the 1S-2S s-wave triplet scattering length, $a_{1S-2S}=-1.4(3)$ nm, which is in fair agreement with a recent calculation. The shift provides a valuable probe of the distribution of densities in a trapped sample., Comment: Accepted for publication in PRL, 9 pages, 4 PostScript figures, ReVTeX. Updated connection of our measurement to theoretical work

Published
1998

19. Hyperfine resonance of gaseous atomic hydrogen at 4.2 K

Author

Crampton, S. B, Kleppner, D, Phillips, W. D, Weinrib, A, Greytak, T. J, and Smith, D. A

Subjects
Atomic And Molecular Physics
Abstract

The hyperfine frequency and wall shift of hydrogen atoms at 4.2 K stored in a bulb coated with solid H2 were measured. The phase shift per wall collision is -0.29(1) rad. The adsorption energy of H on H2 is 9(2) K, and the adsorption time at 4.2 K is approximately 30 nsec. Transverse and longitudinal relaxation times have been measured, and atomic densities greater than 10 to the 14th/cu cm have been observed.

Published
1979
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21. Atomic resonance and scattering

Author

Burnham, C, Kleppner, D, Myint, M. T, Ozier, I, and Prichard, D. E

Subjects
Physics, Atomic, Molecular, And Nuclear
Abstract

Atomic resonance and scattering - magnetic moment of proton and spin-exchange scattering

Published
1967

23. Hydrogen-maser principles and techniques.

Author

Berg, H. C, Crampton, S. B, Kleppner, D, Peters, H. E, Ramsey, N. F, Vanier, J, and Vessot, R. F. C

Subjects
Masers
Abstract

Hydrogen maser construction and operation design principles emphasizing microwave cavity, low magnetic field, hydrogen storage and maser tuning techniques

Published
1965

26. STATUS OF THE MICHIGAN ULTRA-COLD POLARIZED HYDROGEN JET TARGET

Author

LUPPOV, V. G., primary, BLINOV, B. B., additional, DENBOW, J. M., additional, KAGEYA, T., additional, KANDES, M. C., additional, KRISCH, A. D., additional, KULKARNI, D. A., additional, LEHMAN, M. A., additional, LEONOVA, M. A., additional, MOROZOV, V. S., additional, PETERS, C. C., additional, RAYMOND, R. S., additional, ROSS, M. R., additional, YONEHARA, K., additional, BORISOV, N. S., additional, FIMUSHKIN, V. V., additional, PRUDKOGLYAD, A. F., additional, and KLEPPNER, D., additional

Published
2002
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29. Michigan ultra-cold polarized atomic hydrogen jet target.

Author

Blinov, B. B., Gladycheva, S. E., Kageya, T., Kantsyrev, D. Yu., Krisch, A. D., Luppov, V. G., Morozov, V. S., Murray, J. R., Raymond, R. S., Borisov, N. S., Fimushkin, V. V., Grishin, V. N., Mysnik, A. I., and Kleppner, D.

Subjects
COLLISIONS (Nuclear physics), HYDROGEN, ROTATIONAL motion
Abstract

To study spin effects in high energy collisions, we are developing an ultra-cold high-density jet target of proton-spin-polarized hydrogen atoms. The target uses a 12 Tesla magnetic field and a 0.3 K separation cell coated with superfluid helium-4 to produce a slow monochromatic electron-spin-polarized atomic hydrogen beam, which is then focused by a superconducting sextupole into the interaction region. In recent tests, we studied a polarized beam of hydrogen atoms focused by the superconducting sextupole into a compression tube detector, which measured the polarized atoms' intensity. The Jet produced, at the detector, a spin-polarized atomic hydrogen beam with a measured intensity of about 2.8·10[sup 15] H s[sup -1] and a FWHM area of less than 0.13 cm². This intensity corresponds to a free jet density of about 1·10[sup 12] H cm[sup -3] with a proton polarization of about 50%. When the transition RF unit is installed, we expect a proton polarization higher than 90%. [ABSTRACT FROM AUTHOR]

Published
2001

31. CYCLOTRON LABORATORY QUARTERLY PROGRESS REPORT, 1 JUNE-31 AUGUST 1964

Author

Fregeau, Jerome H., primary, Kleppner, D., primary, Robinson, H., primary, Mehran, F., primary, Bainbridge, K. T., primary, Snyder, Nancy, primary, Walker, R., primary, Pound, R. V., primary, Noshkin, V. E., primary, Baba, H., primary, Widgoff, M., primary, Koehler, A. M., primary, Strax, N., primary, Houk, T. L., primary, Measday, D. F., primary, Palmieri, J. N., primary, and Gottschalk, B., primary

Published
1964
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32. Status on the Michigan-MIT ultra-cold polarized hydrogen jet target

Author

Luppov, V. G., primary, Blinov, B. B., additional, Bywater, J. A., additional, Chin, S., additional, Churakov, V. V., additional, Court, G. R., additional, Kaufman, W. A., additional, Kleppner, D., additional, Krisch, A. D., additional, Melnik, Yu. M., additional, Muldavin, J. B., additional, Nurushev, T. S., additional, Price, J. S., additional, Prudkoglyad, A. F., additional, Raymond, R. S., additional, Shutov, V. B., additional, and Stewart, J. A., additional

Published
1995
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38. TWO-PHOTON SPECTROSCOPY OF TRAPPED ATOMIC HYDROGEN.

Author

Cesar, C. L., Fried, D. G., Killian, T. C., Polcyn, A. D., Sandberg, J. C., Doyle, J. M., Yu, I. A., Greytak, T. J., and Kleppner, D.

Subjects
ATOMIC hydrogen, ION traps, MAGNETIC traps, TWO-photon-spectroscopy, DOPPLER effect
Published
1996

39. Trapped atomic hydrogen

Author

Sandberg, J. C., primary, Doyle, J. M., additional, Yu, I. A., additional, Cesar, C. L., additional, Kleppner, D., additional, and Greytak, T. J., additional

Published
1991
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43. Energy distributions of trapped atomic hydrogen

Author

Doyle, J. M., Sandberg, J. C., Masuhara, N., Yu, I. A., Kleppner, D., and Greytak, T. J.

Abstract

Progress on magnetic confinement and evaporative cooling of spin-polarized atomic hydrogen is described, and the first results are presented for the energy distribution of the trapped gas. Data are displayed for energy distributions during various stages of cooling. For the lowest temperature studied the results are in good agreement with the calculated distribution for a temperature of 800 _μK.

Published
1989

44. CYCLOTRON LABORATORY QUARTERLY PROGRESS REPORT, 1 JUNE-31 AUGUST 1964

Author

HARVARD UNIV CAMBRIDGE MA CYCLOTRON LAB, Fregeau, Jerome H, Kleppner, D, Robinson, H, Mehran, F, Bainbridge, K T, Snyder, Nancy, Walker, R, Pound, R V, Noshkin, V E, Baba, H, Widgoff, M, Koehler, A M, Strax, N, Houk, T L, Measday, D F, Palmieri, J N, Gottschalk, B, HARVARD UNIV CAMBRIDGE MA CYCLOTRON LAB, Fregeau, Jerome H, Kleppner, D, Robinson, H, Mehran, F, Bainbridge, K T, Snyder, Nancy, Walker, R, Pound, R V, Noshkin, V E, Baba, H, Widgoff, M, Koehler, A M, Strax, N, Houk, T L, Measday, D F, Palmieri, J N, and Gottschalk, B

Abstract

Content: Quasi-free proton-proton scattering, Investigation of the Faraday cup, Neutron total cross sections, n-p incoherent scattering cross section, Biological uses of proton beams, Test of the chew-low extrapolation method, Fission of medium-weight elements, Isotopic ratio studies of stable elements in the marine environment, Nuclear Magnetism and Nuclear Spectroscopy, Research on the properties of nuclei, Muclear interactions in molecules, Resonance studies with free ions.

Published
1964

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