Measurement of Mutual Coulomb Dissociation in sNN=130\sqrt{s_{NN}}=130 GeV Au+Au collisions at RHIC

We report on the first measurement of Mutual Coulomb Dissociation in heavy ion collisions. We employ forward calorimeters to measure neutron multiplicity at beam rapidity in peripheral collisions. The cross-section for simultaneous electromagnetic breakup of Au nuclei at $\sqrt{s_{NN}}=130$ GeV is $\sigma_{MCD}=3.67\pm 0.25$ barns in good agreement with calculations.Comment: This paper has been submitted for publication in Phys. Rev. Let

Study of electromagnetic dissociation of heavy nuclei at the relativistic heavy ion collider

Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to [email protected], referencing the URI of the item.Includes bibliographical references (leaves 65-66).Issued also on microfiche from Lange Micrographics.The work presented here is devoted to research which I have done within the BRAHMS collaboration at Brookhaven National Laboratory in the period from January 1999 until October 2001. The Texas A&M group in the BRAHMS experiment is responsible for the zero-degree calorimeters (ZDCs) - an important part of the experiment's global detector system. The two BRAHMS ZDCs were built at Texas A&M. The ZDCs measure forward going neutrons at RHIC and are used for beam luminosity monitoring, determining the interaction vertex, making collision centrality measurements, forming triggers, rejecting background and are also used for a number of physics measurements. The experimental data from the BRAHMS zero-degree calorimeters, beam-beam counters and tile multiplicity array were used to study the process of the mutual Coulomb dissociation of gold nuclei during the two runs which have taken place at RHIC in the summer of 2000, at [] = 130 GeV, and in the summer 2001, at [] = 200 GeV. This process is a well-known phenomenon at heavy-ion colliders. When two ultrarelativistic heavy nuclei pass near each other at the impact parameter larger than sum of nuclear radii, the long-ranged Lorentz-contracted electromagnetic field of one nucleus can excite another nucleus by exchange of one or more photons, which usually results in excitation of giant dipole resonance. Resonance de-excitation occurs primarily by emission of neutrons. The transverse momenta of such neutrons are usually less then 250 MeV/c and therefore the neutrons are spread within very narrow cone about the beam direction

ОБЩЕНИЕ В СОЦИАЛЬНЫХ СЕТЯХ КАК ФИЛОСОФСКАЯ ПРОБЛЕМА

One of the formation factors of modern man becomes virtual network structures, displacing traditional forms of social communication. The Internet technology, making social interaction in an imminent, constant phenomenon moves many intimate moments of interpersonal relationships in virtual reality. The spiritual aspect of our society is changing, its system of values, where the objective reality is replaced by its simulacrum, and natural feelings (love, joy, sorrow, sadness) smiles, behind which is not a living person, and its virtual image.Один из факторов формирования современного человека становятся виртуальные сетевые структуры, вытесняющие традиционные формы социального общения. Интернет-технологии, превращая социальное общение в имманентное, беспрерывное явление, перемещают многие интимные моменты межличностных отношений в виртуальную реальность. Меняется духовный облик нашего общества, его система ценностей, где объективная реальность подменяется ее симулякром, а естественные чувства (любовь, радость, горе, печаль) смайликами, за которыми стоит не живой человек, а его виртуальный образ

Assessing computational tools for the discovery of transcription factor binding sites.

The prediction of regulatory elements is a problem where computational methods offer great hope. Over the past few years, numerous tools have become available for this task. The purpose of the current assessment is twofold: to provide some guidance to users regarding the accuracy of currently available tools in various settings, and to provide a benchmark of data sets for assessing future tools.Journal ArticleResearch Support, N.I.H. ExtramuralResearch Support, Non-U.S. Gov'tResearch Support, U.S. Gov't, Non-P.H.S.Research Support, U.S. Gov't, P.H.S.info:eu-repo/semantics/publishe