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Ivan Bazarov, professor of physics, has received a $410,000 grant from the Office of Nuclear Physics at the Department of Energy for research on long lifetime spin-polarized electron sources in partic...
Physics doctoral students Gwen Gardner and Lauren Osojnak, part of Penn’s ATLAS team, are involved in the largest general-purpose particle detector experiment at the Large Haldron Collider (LHC).
At CERN’s Large Hadron Collider (LHC), studies of rare processes allow scientists to infer the presence of heavy particles, including undiscovered particles, that cannot be directly produced. Such par...
ALICE makes first direct observation of a fundamental effect in particle physics（图）
ALICE particle physics fundamental effect charm quark
2022/6/27
The ALICE collaboration at the Large Hadron Collider (LHC) has made the first direct observation of the dead-cone effect – a fundamental feature of the theory of the strong force that binds quarks and...
We are pleased to announce that the 8th International Particle Accelerator Conference, IPAC’17, will take place at the Bella Center Copenhagen, Denmark, from May 14 – 19, 2017. IPAC is the main annual...
Comment on "Particle acceleration by stimulated emission of radiation near a solid-state active medium"
Particle acceleration stimulated emission of radiation
2011/8/31
In a recent Letter,V. Berezovsky, H. Alam, and L. Sch鋍hter have reported 揳cceleration of electrons moving in free space near an active Nd:YAG slab? The reported mechanism is particle acceleration by s...
We investigate here the particle acceleration by naked singularities to arbitrarily high center of mass energies. Recently it has been suggested that black holes could be used as particle accelerators...
Controlled directed particle current despite time-reversal symmetry
Controlled directed particle current despite time-reversal symmetry
2010/11/11
Quantum ratchets are systems that exhibit asymptotic currents when they are driven by a time-periodic potential of zero mean if the proper spatio-temporal symmetries are broken. The current arises fro...
Heavy-particle formalism with Foldy-Wouthuysen representation
Heavy-particle formalism Foldy-Wouthuysen representation
2010/11/11
We use the Foldy-Wouthuysen representation to construct Lorentz-invariant interactions. The couplings obtained this way feature a straightforward $1/m$ expansion, which ensures Lorentz invariance orde...
Physicists find a particle accelerator in the sky（图）
Physicists a particle accelerator the sky
2010/4/21
The first evidence that thunderstorms can function as huge natural particle accelerators has been collected by an international team of researchers. In a presentation at a meeting of the Royal Astrono...