First Measurement of Compton Scattering on $^3\text{He}$ at HI$γ$S

J. Zhou; E. Mancil; M. W. Ahmed; B. Crowe; G. Feldman; F. Q. L. Friesen; H. Gao; D. Godagama; H. W. Grießhammer; D. Hornidge; C. R. Howell; S. Jia; S. Estupinan Jimenez; H. J. Karwowski; M. A. Kovash; K. K. H. Leung; M. Lewis; Y. Liu; D. Markoff; C. Martin; J. McPherson; R. Mendez; S. F. Mikhailov; D. R. Phillips; M. H. Sikora; N. Walton; J. Wang; Y. K. Wu; B. Yu; Z. W. Zhao

arXiv · 2610.07579

First Measurement of Compton Scattering on $^3\text{He}$ at HI$γ$S

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Abstract

The world's first Compton scattering measurements on a $^3$He target were performed to probe neutron electromagnetic polarizabilities. Differential cross sections were measured at laboratory angles of $40^\circ$, $55^\circ$, $90^\circ$, $115^\circ$, $150^\circ$, using circularly polarized, quasi-monoenergetic photon beams at weighted mean energy values of 61.5 and 97.1 MeV from the High Intensity $γ$-ray Source at the Triangle Universities Nuclear Laboratory. Comparisons with chiral effective field theory show good agreement at 97.1 MeV but over-prediction at 61.5 MeV, motivating further theoretical development.

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J. Zhou, E. Mancil, M. W. Ahmed, B. Crowe, G. Feldman, F. Q. L. Friesen, H. Gao, D. Godagama, H. W. Grießhammer, D. Hornidge, C. R. Howell, S. Jia, S. Estupinan Jimenez, H. J. Karwowski, M. A. Kovash, K. K. H. Leung, M. Lewis, Y. Liu, D. Markoff, C. Martin, J. McPherson, R. Mendez, S. F. Mikhailov, D. R. Phillips, M. H. Sikora, N. Walton, J. Wang, Y. K. Wu, B. Yu, Z. W. Zhao. 2026-10-06. First Measurement of Compton Scattering on $^3\text{He}$ at HI$γ$S. https://arxiv.org/abs/2610.07579

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