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The PADME experiment at LNF
Massive photon-like particles are predicted in many extensions of the
Standard Model. They have interactions similar to the photon, are vector
bosons, and can be produced together with photons. The PADME experiment
proposes a search for the dark photon () in the
process in a positron-on-target experiment, exploiting the positron beam of the
DANE linac at the Laboratori Nazionali di Frascati, INFN. In one year of
running a sensitivity in the relative interaction strength down to is
achievable, in the mass region from 2.5 MeV 22.5 MeV. The proposed
experimental setup and the analysis technique is discussed.Comment: to be published in the DHF2014 proceedings EPJ Web of Conference
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Al2O3/ZrO2/Y3Al5O12 composites. A high-temperature mechanical characterization
An Al2O3/5 vol%·ZrO2/5 vol%·Y3Al5O12 (YAG) tri-phase composite was manufactured by surface modification of an alumina powder with inorganic precursors of the second phases. The bulk materials were produced by die-pressing and pressureless sintering at 1500 °C, obtaining fully dense, homogenous samples, with ultra-fine ZrO2 and YAG grains dispersed in a sub-micronic alumina matrix. The high temperature mechanical properties were investigated by four-point bending tests up to 1500 °C, and the grain size stability was assessed by observing the microstructural evolution of the samples heat treated up to 1700 °C. Dynamic indentation measures were performed on as-sintered and heat-treated Al2O3/ZrO2/YAG samples in order to evaluate the micro-hardness and elastic modulus as a function of re-heating temperature. The high temperature bending tests highlighted a transition from brittle to plastic behavior comprised between 1350 and 1400 °C and a considerable flexural strength reduction at temperatures higher than 1400 °C; moreover, the microstructural investigations carried out on the re-heated samples showed a very limited grain growth up to 1650 °C
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