Compton scattering from $^4$He at HI$\gamma$S

Li X.,Ahmed M. W., Banu A., Bartram C., Crowe B.,Downie E. J., Emamian M.,Feldman G., Gao H., Godagama D., Grießhammer H. W.,Howell C. R.,Karwowski H. J., Kendellen D. P., Kovash M. A., Leung K. K. H.,Markoff D., Mikhailov S., Pywell R. E., Sikora M. H., Silano J. A., Sosa R. S., Spraker M. C., Swift G., Wallace P., Weller H. R., Whisnant C. S., Wu Y. K., Zhao Z. W.

arxiv（2019）

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摘要

Differential cross sections for elastic Compton scattering from $^4$He have been measured with high statistical precision at the High Intensity $\gamma$-ray Source at laboratory scattering angles of $55^\circ$, $90^\circ$, and $125^\circ$ using a quasi-monoenergetic photon beam with a weighted mean energy value of $81.3$ MeV. The results are compared to previous measurements and similar fore-aft asymmetry in the angular distribution of the differential cross sections is observed. This experimental work is expected to strongly motivate the development of effective-field-theory calculations of Compton scattering from $^4$He to fully interpret the data.

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