Bulletin of the American Physical Society
45th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 59, Number 8
Monday–Friday, June 2–6, 2014; Madison, Wisconsin
Session K1: Poster Session II (4:00pm - 6:00pm)
4:00 PM,
Wednesday, June 4, 2014
Room: Exhibit Hall
Abstract ID: BAPS.2014.DAMOP.K1.91
Abstract: K1.00091 : Why criteria for impulse approximation in Compton scattering fail in relativistic regimes
Preview Abstract Abstract
Authors:
L.A. LaJohn
(Unversity of Pittsburgh)
R.H. Pratt
(Unversity of Pittsburgh)
$ of the initial bound state momentum distribution p. Comparing with S-matrix results, we find that at relativistic incident photon energies ($\omega_i$) and for high Z elements, one requires information beyond $
/q$ to predict the accuracy of relativistic IA (RIA) diferential cross sections. The IA expression is proportional to the product of a kinematic factor $X^{nr}$ and the symmetrical Compton profile J, where $X^{nr}=1+cos^2\theta$ ($\theta $ is the photon scattering angle). In the RIA case, $X^{nr}$, independent of p, is replaced by $X^{rel}(\omega ,\theta ,p)$ in the integrand which determines J. At nr energies there is virtually no RIA error in the position of the Compton peak maximum ($\omega_f^{pk}$) in the scattered photon energy ($\omega_f$), while RIA error in the peak magnitude can be characterized by $
/q$. This is because at low $\omega_i$, the kinematic effects described by S-matrix (also RIA) expressions behave like $X^{nr}$, while in relativistic regimes (high $\omega_i$ and Z), kinematic factors treated accurately by S-matrix but not RIA expressions become significant and do not factor out.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2014.DAMOP.K1.91
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700