Nuclear Transparency with the gamma + n -> pi- + p Process in 4He

Details Nuclear Transparency with the gamma + n -> pi- + p Process in 4He Nuclear Transparency with the gamma + n -> pi- + p Process in 4He

2003-05-09

arxiv.org/abs/nucl-ex/0305005v1

Phys.Rev.C68:021001,2003

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 3 figures, 2 tables

Scientific paper

10.1103/PhysRevC.68.021001

We have measured the nuclear transparency of the fundamental process $\gamma$ n $\to \pi^-$ p in $^4$He. These measurements were performed at Jefferson Lab in the photon energy range of 1.6 to 4.5 GeV and at $\theta^{\pi}_{cm}= 70^\circ$ and $90^\circ$. These measurements are the first of their kind in the study of nuclear transparency in photoreactions. They also provide a benchmark test of Glauber calculations based on traditional models of nuclear physics. The transparency results suggest deviations from the traditional nuclear physics picture. The momentum transfer dependence of the measured nuclear transparency is consistent with Glauber calculations which include the quantum chromodynamics phenomenon of color transparency.

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