Bulletin of the American Physical Society
APS April Meeting 2010
Volume 55, Number 1
Saturday–Tuesday, February 13–16, 2010; Washington, DC
Session A7: Mini-Symposium on Electromagnetic Reactions Involving Light Nuclei I |
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Sponsoring Units: DNP GFB Chair: Harald W. Griesshammer, The George Washington University Room: Delaware A |
Saturday, February 13, 2010 8:30AM - 9:06AM |
A7.00001: Electromagnetic Reactions Involving Light Nuclei Invited Speaker: The structure of light nuclei is of primary importance for microscopic approaches to understanding nuclei. Precise knowledge at low energies also provides a connection to issues in nuclear astrophysics and to chiral perturbation and effective field theories, low energy approaches to quantum chromodynamics. High energy studies test quark-model approaches to nuclear structure. I will review recent experimental developments that test our understanding of the deuteron and $^3$He systems through measurements of photo-disintegration, the Gerasimov Drell-Hearn sum rule, elastic electron scattering form factors, and quasifree ($e,e^{\prime}$) reactions. I will also describe some prospects for future work. [Preview Abstract] |
Saturday, February 13, 2010 9:06AM - 9:18AM |
A7.00002: A precision description of deuteron electromagnetic form factors at low Q$^2$ Daniel Phillips I will discuss the use of chiral effective theory ($\chi$ET) to compute the form factors $G_C$, $G_Q$, and $G_M$ that are measured in elastic electron-deuteron scattering. I will show that NN potentials derived from $\chi$ET, when used in concert with the $\chi$ET current operators, give an accurate description of the ratio $G_Q/G_C$ for momentum transfers $\sqrt{Q^2} < 0.6$ GeV. I will describe ongoing work to achieve similar precision for the magnetic form factor $G_M$. I will also show a prediction for the charge form factor $G_C$ that is based on a $\chi$ET calculation at $O(eP^5)$. Such a prediction should be accurate up to corrections of order 1--2\% for momentum transfers $\sim M_\pi^2$. I will explain how this uncertainty grows with $Q^2$, and then close by showing the resulting $\chi$ET prediction (including theoretical uncertainties) for $A(Q)$ in the range $\sqrt{Q^2} < 0.7$ GeV. This prediction can be compared to recent JLab data on $A(Q)$, taken in the range $0.2 < \sqrt{Q^2} < 0.7$ GeV. [Preview Abstract] |
Saturday, February 13, 2010 9:18AM - 9:30AM |
A7.00003: ABSTRACT WITHDRAWN |
Saturday, February 13, 2010 9:30AM - 9:42AM |
A7.00004: Measurement of the tensor analyzing powers $T_{20}$ and $T_{21}$ in elastic electron-deuteron scattering with BLAST Michael Kohl With the BLAST experiment at MIT-Bates, precision measurements of single and double polarization observables were carried out by scattering longitudinally polarized electrons from internal, isotopically pure and highly polarized hydrogen and deuterium targets in elastic and quasi-elastic kinematics. Analysis of elastic scattering data acquired with tensor-polarized deuterium has provided new results at low momentum transfer for the deuteron tensor analyzing powers $T_{20}$ and $T_{21}$ which will be presented. [Preview Abstract] |
Saturday, February 13, 2010 9:42AM - 9:54AM |
A7.00005: Measurement of the magnetic form factor of the neutron with quasielastic electron scattering from vector-polarized deuterium with BLAST Ricardo Alarcon With the BLAST experiment at MIT-Bates, precision measurements of single and double polarization observables were carried out by scattering longitudinally polarized electrons from internal, isotopically pure and highly polarized hydrogen and deuterium targets in elastic and quasi-elastic kinematics. Analysis of inclusive scattering data acquired with vector-polarized deuterium has provided new results at low momentum transfer for the neutron magnetic form factor $G_M^n$ which will be presented. [Preview Abstract] |
Saturday, February 13, 2010 9:54AM - 10:06AM |
A7.00006: Large Q2 Electrodisintegration of the Deuteron in Virtual Nucleon Approximation Misak Sargsian Two-body break up of the deuteron is studied at high $Q^2$ kinematics, with main motivation to probe the deuteron at small internucleon distances. Such studies are associated with the probing of high momentum component of the deuteron wave function. For this, two main theoretical issues have been addressed such as electromagnetic interaction of virtual photon with the bound nucleon and the strong interaction of produced baryons at the final state of the break-up reaction. Within virtual nucleon approximation we developed a new prescription to account for the bound nucleon effects in electromagnetic interaction. The final state interaction at high $Q^2$ kinematics is calculated within generalized eikonal approximation~(GEA). We studied the uncertainties involved in the calculation and performed comparisons with the first experimental data on deuteron electrodisintegration at large $Q^2$. We demonstrate that the experimental data confirm GEA's early prediction that the rescattering is maximal at $\sim 70^0$ of recoil nucleon production with respect to the momentum of virtual photon. Comparisons also show that the forward recoil nucleon angles are best suited for studies of the electromagnetic interaction of bound nucleons and the high momentum structure of the deuteron. [Preview Abstract] |
Saturday, February 13, 2010 10:06AM - 10:18AM |
A7.00007: Experiment E06-009, ``ROSEN07'': Measurement of $R=F_L/F_T$ on Deuterium in the Nucleon Resonance Region Ibrahim Albayrak This experiment ran in Hall C at Jefferson Lab to measure L/T separated structure functions from deuterium from the quasielastic region through the nucleon resonance region and beyond(up to $W^2=4.5 GeV^2$), spanning the four-momentum transfer range $1<4.5 (GeV/c)^2$. Rosenbluth separation technique is used to extract separated structure functions $F_1, F_2, F_L$ and $R$. The measurement of these fundamental quantities allows a variety of physics issues to be addressed including: an evaluation of QCD moments of the deuterium and neutron structure functions (experimentally determining both the proton and neutron moments provide a direct confrontation with recent and future calculations from lattice QCD of the nucleon non-singlet moments), and quark-hadron duality in protons and neutrons. This experiment was completed in july 2007 at Jefferson Lab using the equipment: the High Momentum Spectrometer (HMS) to detect electrons and 4 cm cryogenic deuterium target. The current status of the data analysis and preliminary results such as nearly finalized cross sections, L/T separation results on deuterium, preliminary moments and duality studies will be presented. [Preview Abstract] |
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