排序方式: 共有6条查询结果,搜索用时 15 毫秒
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D. Aston W. Dunwoodie S. Durkin T. Fieguth A. Honma D. Hutchinson W.B. Johnson P. Kunz T. Lasinski D.W.G.S. Leith L. Levinson W.T. Meyer B.N. Ratcliff R. Richter S. Shapiro R. Stroynowski S. Suzuki S. Williams R. McKee 《Physics letters. [Part B]》1981,99(6):502-506
High statistics data for the reaction K?p → K?π+n at have been obtained in the LASS spectrometer at SLAC. A spherical harmonic moment analysis of the Kπ angular distribution displays evidence for a new K1 state at with the spin-parity assignment, JP = 4+. 相似文献
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Abrams GS Adolphsen CE Aleksan R Alexander JP Allen MA Atwood WB Averill D Ballam J Bambade P Barish BC Barklow T Barnett BA Bartelt J Bethke S Blockus D de Boer W Bonvicini G Boyarski A Brabson B Breakstone A Breidenbach M Brom JM Brown JL Brown KL Bulos F Burchat PR Burke DL Cence RJ Chapman J Chmeissani M Clendenin J Cords D Coupal DP Dauncey P Dean NR DeStaebler HC Dorfan DE Dorfan JM Drell PS Drewer DC Dydak F Ecklund S Elia R Erickson RA Fay J Feldman GJ Fernandes D Field RC Fieguth TH 《Physical review letters》1989,63(7):724-727
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E. Brown A. Buss A. Fieguth C. Huhmann M. Murra H.-W. Ortjohann S. Rosendahl A. Schubert D. Schulte D. Tosi G. Gratta C. Weinheimer 《The European Physical Journal C - Particles and Fields》2018,78(7):604
Experiments based on noble elements such as gaseous or liquid argon or xenon utilize the ionization and scintillation properties of the target materials to detect radiation-induced recoils. A requirement for high light and charge yields is to reduce electronegative impurities well below the ppb (parts per billion, 1 ppb \(=1\times 10^{-9}\) mol/mol) level. To achieve this, the target material is continuously circulated in the gas phase through a purifier and returned to the detector. Additionally, the low backgrounds necessary dictate low-Rn-emanation rates from all components that contact the gas. Since commercial pumps often introduce electronegative impurities from lubricants on internal components or through small air leaks, and are not designed to meet the radiopurity requirements, custom-built pumps are an advantageous alternative. A new pump has been developed in Muenster in cooperation with the nEXO group at Stanford University and the nEXO/XENON group at Rensselaer Polytechnic Institute based on a magnetically-coupled piston in a hermetically sealed low-Rn-emanating vessel. This pump delivers high performance for noble gases, reaching more than 210 standard liters per minute (slpm) with argon and more than 170 slpm with xenon while maintaining a compression of up to 1.9 bar, demonstrating its capability for noble gas detectors and other applications requiring high standards of gas purity. 相似文献
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Anthony PL Arnold RG Arroyo C Baird K Bega K Biesiada J Bosted PE Breuer M Carr R Cates GD Chen JP Chudakov E Cooke M Decker FJ Decowski P Deur A Emam W Erickson R Fieguth T Field C Gao J Gustafsson K Hicks RS Holmes R Hughes EW Humensky TB Jones GM Kaufman LJ Kolomensky YG Kumar KS Lhuillier D Lombard-Nelsen R Mastromarino P Mayer B McKeown RD Michaels R Olson M Paschke KD Peterson GA Pitthan R Pope K Relyea D Rock SE Saxton O Shapiro G Singh J Souder PA Szalata ZM Tobias WA Tonguc BT Turner J 《Physical review letters》2004,92(18):181602
We report a measurement of the parity-violating asymmetry in fixed target electron-electron (M?ller) scattering: A(PV)=[-175+/-30(stat)+/-20(syst)] x 10(-9). This first direct observation of parity nonconservation in M?ller scattering leads to a measurement of the electron's weak charge at low energy Q(e)(W)=-0.053+/-0.011. This is consistent with the standard model expectation at the current level of precision: sin((2)theta(W)(M(Z))((-)MS)=0.2293+/-0.0024(stat)+/-0.0016(syst)+/-0.0006(theory). 相似文献
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Anthony PL Arnold RG Arroyo C Bega K Biesiada J Bosted PE Bower G Cahoon J Carr R Cates GD Chen JP Chudakov E Cooke M Decowski P Deur A Emam W Erickson R Fieguth T Field C Gao J Gary M Gustafsson K Hicks RS Holmes R Hughes EW Humensky TB Jones GM Kaufman LJ Keller L Kolomensky YG Kumar KS LaViolette P Lhuillier D Lombard-Nelsen RM Marshall Z Mastromarino P McKeown RD Michaels R Niedziela J Olson M Paschke KD Peterson GA Pitthan R Relyea D Rock SE Saxton O Singh J Souder PA Szalata ZM Turner J 《Physical review letters》2005,95(8):081601
We report on a precision measurement of the parity-violating asymmetry in fixed target electron-electron (M?ller) scattering: A(PV) = [-131 +/- 14(stat) +/- 10(syst)] x 10(-9), leading to the determination of the weak mixing angle sin2(thetaW(eff) = 0.2397 +/- 0.0010(stat) +/- 0.0008(syst), evaluated at Q2 = 0.026 GeV2. Combining this result with the measurements of sin2(thetaW(eff) at the Z0 pole, the running of the weak mixing angle is observed with over 6sigma significance. The measurement sets constraints on new physics effects at the TeV scale. 相似文献
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R. Stroynowski D. Blockus W. Dunwoodie D.W.G.S. Leith M. Marshall C.L. Woody B. Barnett C.Y. Chien T. Fieguth M. Gilchriese D. Hutchinson W.B. Johnson P. Kunz T. Lasinski L. Madansky W.T. Meyer A. Pevsner S. Williams 《Physics letters. [Part B]》1980,97(2):315-319
The production of prompt electron-positron pairs in 16 GeV/c π-p collisions has been measured using the LASS spectrometer at SLAC. An excess of events is observed above the estimated contribution of direct and Dalitz decays of known resonances in the kinematic range defined by and . The excess signal decreases slowly with increasing M, but exhibits very steep χ and pT2 dependence. 相似文献
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