The development of fluorescent sensors for Hg2+ has attracted much attention due to the well-known adverse effects of mercury on biological health. In the present work, the optical properties of two newly-synthesized Hg2+ chemosensors based on the coumarin-rhodamine system (named Pro1 and Pro2) were systematically investigated using time-dependent density functional theory. It is shown that Pro...

Single prompt photon and pion spectra in p–p and Au–Au collisions at intermediate RHIC energy, √ s NN = 62.4 GeV, are computed at large p ⊥ in perturbative QCD. Next-to-leading order calculations in p–p scattering are first presented. The quenching of the prompt photon and pion yield due to energy loss processes in central Au–Au with respect to p–p collisions is then predicted. At this energy, ...

We present angle-resolved photoemission spectroscopy data from insulating A2CuO2X2 (A5Sr, Ca; X 5Cl, Br!, Sr2Cu3O4Cl2, and Bi2Sr2MCu2O8 (M5Er, Dy! single crystals, which illustrate that the low-energy electronic structure of the half-filled cuprates are independent of the apical atom. By performing a photon energy dependent study on Ca2CuO2Cl2, we are able to distinguish between features which ...

We present the first observation of the bottomonium ground state ηb(1S) in the photon energy spectrum using a sample of (109 ± 1) million of Υ(3S) events recorded at the Υ(3S) energy with the BaBar detector at the PEP-II B factory at SLAC. A peak at Eγ = 921.2 +2.1 −2.8(stat) ± 2.4(syst) MeV observed with a significance of 10 standard deviations in the photon energy spectrum is interpretated as...

In this invited talk at the " historical " session of PHOTON2005, I was asked to recount the history and the development, from its earliest days to the present, of the idea of photon colliders based on conversion of high energy electrons to high-energy photons at a future high-energy linear e + e − collider. Described in this talk are the general features and schemes of a photon collider, the e...

  Introduction: Several studies have discussed to the electron contamination caused by the air column between the head of linac and patient for photon beams. Since it is not possible to measure the electron contamination with practical dosimetry, the Monte Carlo technique is an appropriate and accurate choice to calculate particle flounce in radiation therapy. The purpose of t...

Background: The present study aimed to investigate the equivalent dose in vital organs, including heart and lung, due to secondary particles produced during breast proton therapy. Materials and Methods: The numerical ORNL female-phantom was improved and simulated using the Monte Carlo MCNPX code. The depth-dose profile of proton beams with different energies was simulated. The proper energy ran...

The SLAC electron-positron colliding beam facility and its associated magnetic detector facility are described. General experimental problems in performing photon-photon collision experiments at SPEAR and the proposed experiment of Masek et al. are discussed. -e (Talk presented at the International Colloquium on Photon-Photon Collisions in Electron-Positron Storage Rings, Paris, Sept. 3-4, 1973...