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81.
Gabrielse G Kolthammer WS McConnell R Richerme P Kalra R Novitski E Grzonka D Oelert W Sefzick T Zielinski M Fitzakerley D George MC Hessels EA Storry CH Weel M Müllers A Walz J;ATRAP Collaboration 《Physical review letters》2011,106(7):073002
Adiabatic cooling is shown to be a simple and effective method to cool many charged particles in a trap to very low temperatures. Up to 3×10(6) p are cooled to 3.5 K-10(3) times more cold p and a 3 times lower p temperature than previously reported. A second cooling method cools p plasmas via the synchrotron radiation of embedded e(-) (with many fewer e(-) than p in preparation for adiabatic cooling. No p are lost during either process-a significant advantage for rare particles. 相似文献
82.
Aprile E Arisaka K Arneodo F Askin A Baudis L Behrens A Bokeloh K Brown E Bruch T Bruno G Cardoso JM Chen WT Choi B Cline D Duchovni E Fattori S Ferella AD Gao F Giboni KL Gross E Kish A Lam CW Lamblin J Lang RF Levy C Lim KE Lin Q Lindemann S Lindner M Lopes JA Lung K Undagoitia TM Mei Y Fernandez AJ Ni K Oberlack U Orrigo SE Pantic E Persiani R Plante G Ribeiro AC Santorelli R dos Santos JM Sartorelli G Schumann M Selvi M Shagin P Simgen H Teymourian A Thers D Vitells O Wang H Weber M 《Physical review letters》2011,107(13):131302
We present results from the direct search for dark matter with the XENON100 detector, installed underground at the Laboratori Nazionali del Gran Sasso of INFN, Italy. XENON100 is a two-phase time-projection chamber with a 62 kg liquid xenon target. Interaction vertex reconstruction in three dimensions with millimeter precision allows the selection of only the innermost 48 kg as the ultralow background fiducial target. In 100.9 live days of data, acquired between January and June 2010, no evidence for dark matter is found. Three candidate events were observed in the signal region with an expected background of (1.8 ± 0.6) events. This leads to the most stringent limit on dark matter interactions today, excluding spin-independent elastic weakly interacting massive particle (WIMP) nucleon scattering cross sections above 7.0 × 10(-45) cm(2) for a WIMP mass of 50 GeV/c(2) at 90% confidence level. 相似文献
83.
The double-beta-decay experiment NEMO-3 has been taking data since February 2003. The aim of this experiment is to search
for neutrinoless (0 νββ) decay and investigate two neutrino doublebeta decay in seven different isotopically enriched samples (100Mo, 82Se, 48Ca, 96Zr, 116Cd, 130Te, and 150Nd). After analysis of the data corresponding to 3.75 yr, no evidence for 0 νββ decay in the 100Mo and 82Se samples was found. The half-life limits at the 90% C.L. are 1.1 × 1024 and 3.6 × 1023 yr, respectively. Additionally for 0 νββ decay the following limits at the 90% C.L. were obtained, >1.3 × 1022 yr for 48Ca, >9.2 × 1021 yr for 96Zr, and >1.8 × 1022 yr for 150Nd. The 2 νββ decay half-life values were precisely measured for all investigated isotopes. 相似文献
84.
85.
The process of polarised deep inelastic scattering and the information it has given on the spin structure of the nucleon are introduced. The experimental programmes in this field are described and the latest inclusive and semi-inclusive data and analyses are reviewed. Proposed future measurements are summarised. 相似文献
86.
A. Baurichter M. Deicher S. Deubler D. Forkel J. Meier H. Wolf W. Witthuhn ISOLDE Collaboration 《Applied Surface Science》1991,50(1-4):165-168
Molecule-like defect complexes have been studied at Cd acceptors in the III–V semiconductors GaAs, GaP, InP, InAs, and InSb by PAC spectroscopy. After hydrogen plasma treatment, the formation of Cd-H complexes was observed in all these compounds. Additionally, the formation and stability of Cd-S and Cd-Se pairs in GaAs have been analyzed. 相似文献
87.
88.
Using a data sample of integrated luminosity of about 33 pb-1 collected around 3.773 GeV with the BESII detector at the BEPC collider, the semileptonic decays D+→φe+νe, D+→φμ+νμ and the hadronic decay D+→φπ+ are studied. The upper limits of the branching fractions are set to be BF(D+→φe+νe)<2.01% and BF(D+→φμ+νμ)<2.04% at the 90% confidence level. The ratio of the branching fractions for D+→φπ+ relative to D+→K-π+π+ is measured to be 0.057±0.011±0.003. In addition, the branching fraction for D+→φπ+ is obtained to be (5.2±1.0±0.4)×10-3. 相似文献
89.
I. V. Ajinenko Yu. A. Belokopytoy H. Bialkowska H. Boettcher F. Bottorweck P. V. Chliapnikov F. Crijns A. de Roeck E. A. de Wolf K. Dziunikowska A. M. F. Endler A. Eskreys Z. C. Garutchava Y. Golubkov H. Graessler G. R. Gulkanyan P. van Hal R. Sh. Hakobyan T. Haupt W. Kittel D. Kisielewska B. B. Levchenko F. Meijers A. B. Micha?owska Th. Naumann V. I. Nikolaenko K. Olkiewicz B. Pawlik L. P. Petrovikh R. P?ll?nen V. M. Ronjin A. M. Rybin H. M. T. Saarikko W. Schmitz L. Scholten L. N. Smirnova O. G. Tchikilev A. G. Tomaradze V. A. Uvarov F. Verbeure R. Wischnewski EHS-NA Collaboration 《Zeitschrift fur Physik C Particles and Fields》1989,42(3):377-385
Multiplicity distributions, observed inK + interactions with Al and Au nuclei at 250 GeV/c incident momentum are presented. They are analyzed in the framework of multiple collisions of the incident particle inside a nucleus. The probability distribution of the number of grey tracks is well described by the model of Andersson et al., if a negative binomial distribution is assumed for the distribution of the number of grey protons produced per elementary collision instead of the usual geometrical distribution. The analysis of the average and dispersion of the charge multiplicity distribution supports the validity of the multiple collision model, including results on correlations between forward and backward multiplicities. 相似文献
90.