New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering Over a Range of Spin-0 Nuclei
Creators: name: PREX
name: Collaborations, CREX
name: :
name: Adhikari, D.
name: Albataineh, H.
name: Androic, D.
name: Aniol, K.
name: Armstrong, D. S.
name: Averett, T.
name: Gayoso, C. Ayerbe
name: Barcus, S.
name: Bellini, V.
name: Beminiwattha, R. S.
name: Benesch, J. F.
name: Bhatt, H.
name: Pathak, D. Bhatta
name: Bhetuwal, D.
name: Blaikie, B.
name: Boyd, J.
name: Campagna, Q.
name: Camsonne, A.
name: Cates, G. D.
name: Chen, Y.
name: Clarke, C.
name: Cornejo, J. C.
name: Dusa, S. Covrig
name: Dalton, M. M.
name: Datta, P.
name: Deshpande, A.
name: Dutta, D.
name: Feldman, C.
name: Fuchey, E.
name: Gal, C.
name: Gaskell, D.
name: Gautam, T.
name: Gericke, M.
name: Ghosh, C.
name: Halilovic, I.
name: Hansen, J. -O.
name: Hauenstein, F.
name: Henry, W.
name: Horowitz, C. J.
name: Jantzi, C.
name: Jian, S.
name: Johnston, S.
name: Jones, D. C.
name: Karki, B.
name: Kakkar, S.
name: Katugampola, S.
name: Keppel, C. E.
name: King, P. M.
name: King, D. E.
name: Knauss, M.
name: Kumar, K. S.
name: Kutz, T.
name: Lashley-Colthirst, N.
name: Leverick, G.
name: Liu, H.
name: Liyange, N.
name: Malace, S.
name: Mammei, J.
name: Mammei, R.
name: McCaughan, M.
name: McNulty, D.
name: Meekins, D.
name: Metts, C.
name: Michaels, R.
name: Mihovilovic, M.
name: Mondal, M. M.
name: Napolitano, J.
name: Nikolaev, D.
name: Rashad, M. N. H.
name: Owen, V.
name: Palatchi, C.
name: Pan, J.
name: Pandey, B.
name: Park, S.
name: Paschke, K. D.
name: Petrusky, M.
name: Pitt, M. L.
name: Premathilake, S.
name: Puckett, A. J. R.
name: Quinn, B.
name: Radloff, R.
name: Rahman, S.
name: Rathnayake, A.
name: Reed, B. T.
name: Reimer, P. E.
name: Richards, R.
name: Riordan, S.
name: Roblin, Y.
name: Seeds, S.
name: Shahinyan, A.
name: Souder, P. A.
name: Tang, L.
name: Thiel, M.
name: Tian, Y.
name: Urciuoli, G. M.
name: Wertz, E. W.
name: Wojtsekhowski, B.
name: Xiong, W.
name: Yale, B.
name: Ye, T.
name: Zec, A.
name: Zhang, W.
name: Zhang, J.
name: Zheng, X.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report precision determinations of the beam normal single spin asymmetries ($A_n$) in the elastic scattering of 0.95 and 2.18~GeV electrons off $^{12}$C, $^{40}$Ca, $^{48}$Ca, and $^{208}$Pb at very forward angles where the most detailed theoretical calculations have been performed. The first measurements of $A_n$ for $^{40}$Ca and $^{48}$Ca are found to be similar to that of $^{12}$C, consistent with expectations thus demonstrating the validity of theoretical calculations for nuclei with Z~$\leq20$. We also report $A_n$ for $^{208}$Pb at two new momentum transfers (Q$^2$) extending the previous measurement. Our new data confirm the surprising result previously reported, with all three data points showing significant disagreement with the results from the $Z\leq 20$ nuclei. These data confirm our basic understanding of the underlying dynamics that govern $A_n$ for nuclei containing $\lesssim 50$ nucleons, but point to the need for further investigation to understand the unusual $A_n$ behaviour discovered for scattering off $^{208}$Pb.
description: 7 pages, 2 figures