排序方式: 共有16条查询结果,搜索用时 859 毫秒
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S. Roth G. Angloher I. Bavykina A. Brown C. Ciemniak G. Deuter F.v. Feilitzsch D. Hauff M. Hofmann J. Imber C. Isaila M. Kiefer H. Kraus J.-C. Lanfranchi B. Majorovits M. Malek V. Mikhailik F. Petricca W. Potzel K. Rottler K. Schäffner S. Scholl M.v. Sivers R. Strauss I. Usherov 《Progress in Particle and Nuclear Physics》2010,64(2):457-459
The current status of the direct Dark Matter experiments CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) and the planned EURECA (European Underground Rare Event Calorimeter Array) is presented. Both experiments are aimed at the direct detection of WIMPs (Weakly Interacting Massive Particles), potential candidates for the Dark Matter in the universe. New design developments of the cryogenic detectors operated at mK temperatures are investigated to optimize detector performance and to simplify mass production. Thus, CRESST is also providing a basis for the EURECA project, aimed at a ton of cryogenic detectors with a multi-material target. 相似文献
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Morozov VS Etienne ZB Kandes MC Krisch AD Leonova MA Sivers DW Wong VK Yonehara K Anferov VA Meyer HO Schwandt P Stephenson EJ von Przewoski B 《Physical review letters》2003,91(21):214801
We recently studied spin flipping of a 270 MeV vertically polarized deuteron beam stored in the Indiana University Cyclotron Facility Cooler Ring. We adiabatically swept an rf solenoid's frequency through an rf-induced spin resonance and observed its effect on the deuterons' vector and tensor polarizations. After optimizing the resonance crossing rate and maximizing the solenoid's voltage, we measured a vector spin-flip efficiency of 94.2%+/-0.3%. We also found striking behavior of the spin-1 tensor polarization. 相似文献
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C. Isaila C. Ciemniak F.v. Feilitzsch A. Gütlein J. Kemmer T. Lachenmaier J.-C. Lanfranchi S. Pfister W. Potzel S. Roth M.v. Sivers R. Strauss W. Westphal F. Wiest 《Physics letters. [Part B]》2012
The simultaneous measurement of phonons and scintillation light induced by incident particles in a scintillating crystal such as CaWO4 is a powerful technique for the active rejection of background induced by γ?s and β ?s and even neutrons in direct Dark Matter searches. However, ?1% of the energy deposited in a CaWO4 crystal is detected as light. Thus, very sensitive light detectors are needed for an efficient event-by-event background discrimination. Due to the Neganov–Luke effect, the threshold of low-temperature light detectors based on semiconducting substrates can be improved significantly by drifting the photon-induced electron–hole pairs in an applied electric field. We present measurements with low-temperature light detectors based on this amplification mechanism. The Neganov–Luke effect makes it possible to improve the signal-to-noise ratio of our light detectors by a factor of ∼9 corresponding to an energy threshold of ∼21 eV. We also describe a method for an absolute energy calibration using a light-emitting diode. 相似文献
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Dennis Sivers 《Annals of Physics》1975,90(1):71-112
We analyze phenomenologically several models for the high-energy scattering of hadrons through fixed, large angles. The emphasis is on trying to isolate and understand those aspects of hadronic forces which are important at large angles. We review the fixed-angle-lower bounds derived from analyticity and discuss how simple geometrical concepts can be used to guide our extrapolation of cross sections away from the forward and backward peaks into the large-angle region. This extrapolation is important in understanding whether or not we need a new, hard component of the hadronic force to interpret the data. We try to isolate the important features of dual models, statistical models, and constituent models and to clarify the possibility of experimental distinction between these approaches. 相似文献