From keppeljlab@gmail.com Fri Oct 2 05:12:19 2009 Date: Fri, 2 Oct 2009 11:12:16 +0200 From: Cynthia Keppel To: Rolf Ent Subject: and another section Hey there, Typing in one more.... \subsection{General} The group has also been active in work of general interest for Jefferson Lab. As a highlight, the systematic studies of beam line and spectrometers required for precision Rosenbluth separations led by this group resulted in a detailed knowledge of Hall C spectrometer and detector performances over a period of many years and set the stage for what will be achievable with the planned super high momentum spectrometer for Hall C at 12 GeV. The group made significant improvements to the previously-utilized radiative corrections codes, including developing new precision cross section model inputs. These general efforts will not be part of this funding proposal, but are clearly of importance. Many of our students have worked on parts of these studies. Beyond the experiments spokespersoned by the group, the group has collaborated with a large role in several additional JLab Hall C experiments, including: a HU-led (but not by this group) hypernuclear spectroscopy experiment; a precision study of the EMC effect in light nuclei; an inclusive nuclear structure function measurement focusing on the $x > 1$ region; and a proton elastic Rosenbluth separation aimed at quantifying potential two photon radiative effects. For the last, weekly analysis meetings are combined with HU-led experiments E00-002, E02-109 and E06-008. We note as well that the BONUS target has become somehat general purpose, and has been modified by another collaboration for use with helium to run an additional Hall B experiment. Perhaps most importantly, HU graduate student Anusha Pushpakumari received her doctoral thesis from the Spin Asymmetries on the Nucleon Experiment (SANE) in Hall C. SANE is a measurement of the proton spin structure function $g_2$ and asymmetry $A_1$, and relies in part on the HU global models of the $F_1$ and $R$ unpolarized structure functions. The HU group is playing a major role in the analysis of this experiment, and contributed as well to semi-SANE, a corresponding Hall C semi-inclusive spin asymmetry measurement.