New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei

PREX and CREX Collaborations

doi:10.1103/PhysRevLett.128.142501

New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei

PREX and CREX Collaborations

Department of Physics

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14 Scopus citations

Abstract

We report precision determinations of the beam-normal single spin asymmetries (An) in the elastic scattering of 0.95 and 2.18 GeV electrons off C12, Ca40, Ca48, and Pb208 at very forward angles where the most detailed theoretical calculations have been performed. The first measurements of An for Ca40 and Ca48 are found to be similar to that of C12, consistent with expectations and thus demonstrating the validity of theoretical calculations for nuclei with Z≤20. We also report An for Pb208 at two new momentum transfers (Q2) 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≤20 nuclei. These data confirm our basic understanding of the underlying dynamics that govern An for nuclei containing 50 nucleons, but point to the need for further investigation to understand the unusual An behavior discovered for scattering off Pb208.

Original language	English (US)
Article number	142501
Journal	Physical Review Letters
Volume	128
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.128.142501
State	Published - Apr 8 2022

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.128.142501

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@article{fcd9073c4f284ae394fd6977f8249b88,

title = "New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei",

abstract = "We report precision determinations of the beam-normal single spin asymmetries (An) in the elastic scattering of 0.95 and 2.18 GeV electrons off C12, Ca40, Ca48, and Pb208 at very forward angles where the most detailed theoretical calculations have been performed. The first measurements of An for Ca40 and Ca48 are found to be similar to that of C12, consistent with expectations and thus demonstrating the validity of theoretical calculations for nuclei with Z≤20. We also report An for Pb208 at two new momentum transfers (Q2) 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≤20 nuclei. These data confirm our basic understanding of the underlying dynamics that govern An for nuclei containing 50 nucleons, but point to the need for further investigation to understand the unusual An behavior discovered for scattering off Pb208.",

author = "{PREX and CREX Collaborations} and D. Adhikari and H. Albataineh and D. Androic and K. Aniol and Armstrong, {D. S.} and T. Averett and {Ayerbe Gayoso}, C. and S. Barcus and V. Bellini and Beminiwattha, {R. S.} and Benesch, {J. F.} and H. Bhatt and {Bhatta Pathak}, D. and D. Bhetuwal and B. Blaikie and J. Boyd and Q. Campagna and A. Camsonne and Cates, {G. D.} and Y. Chen and C. Clarke and Cornejo, {J. C.} and {Covrig Dusa}, S. and Dalton, {M. M.} and P. Datta and A. Deshpande and D. Dutta and C. Feldman and E. Fuchey and C. Gal and D. Gaskell and T. Gautam and M. Gericke and C. Ghosh and I. Halilovic and Hansen, {J. O.} and F. Hauenstein and W. Henry and Horowitz, {C. J.} and C. Jantzi and S. Jian and S. Johnston and Jones, {D. C.} and B. Karki and S. Kakkar and S. Katugampola and Keppel, {C. E.} and King, {P. M.} and King, {D. E.} and Souder, {P. A.}",

note = "Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

year = "2022",

month = apr,

day = "8",

doi = "10.1103/PhysRevLett.128.142501",

language = "English (US)",

volume = "128",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "14",

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TY - JOUR

T1 - New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei

AU - PREX and CREX Collaborations

AU - Adhikari, D.

AU - Albataineh, H.

AU - Androic, D.

AU - Aniol, K.

AU - Armstrong, D. S.

AU - Averett, T.

AU - Ayerbe Gayoso, C.

AU - Barcus, S.

AU - Bellini, V.

AU - Beminiwattha, R. S.

AU - Benesch, J. F.

AU - Bhatt, H.

AU - Bhatta Pathak, D.

AU - Bhetuwal, D.

AU - Blaikie, B.

AU - Boyd, J.

AU - Campagna, Q.

AU - Camsonne, A.

AU - Cates, G. D.

AU - Chen, Y.

AU - Clarke, C.

AU - Cornejo, J. C.

AU - Covrig Dusa, S.

AU - Dalton, M. M.

AU - Datta, P.

AU - Deshpande, A.

AU - Dutta, D.

AU - Feldman, C.

AU - Fuchey, E.

AU - Gal, C.

AU - Gaskell, D.

AU - Gautam, T.

AU - Gericke, M.

AU - Ghosh, C.

AU - Halilovic, I.

AU - Hansen, J. O.

AU - Hauenstein, F.

AU - Henry, W.

AU - Horowitz, C. J.

AU - Jantzi, C.

AU - Jian, S.

AU - Johnston, S.

AU - Jones, D. C.

AU - Karki, B.

AU - Kakkar, S.

AU - Katugampola, S.

AU - Keppel, C. E.

AU - King, P. M.

AU - King, D. E.

AU - Souder, P. A.

PY - 2022/4/8

Y1 - 2022/4/8

N2 - We report precision determinations of the beam-normal single spin asymmetries (An) in the elastic scattering of 0.95 and 2.18 GeV electrons off C12, Ca40, Ca48, and Pb208 at very forward angles where the most detailed theoretical calculations have been performed. The first measurements of An for Ca40 and Ca48 are found to be similar to that of C12, consistent with expectations and thus demonstrating the validity of theoretical calculations for nuclei with Z≤20. We also report An for Pb208 at two new momentum transfers (Q2) 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≤20 nuclei. These data confirm our basic understanding of the underlying dynamics that govern An for nuclei containing 50 nucleons, but point to the need for further investigation to understand the unusual An behavior discovered for scattering off Pb208.

AB - We report precision determinations of the beam-normal single spin asymmetries (An) in the elastic scattering of 0.95 and 2.18 GeV electrons off C12, Ca40, Ca48, and Pb208 at very forward angles where the most detailed theoretical calculations have been performed. The first measurements of An for Ca40 and Ca48 are found to be similar to that of C12, consistent with expectations and thus demonstrating the validity of theoretical calculations for nuclei with Z≤20. We also report An for Pb208 at two new momentum transfers (Q2) 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≤20 nuclei. These data confirm our basic understanding of the underlying dynamics that govern An for nuclei containing 50 nucleons, but point to the need for further investigation to understand the unusual An behavior discovered for scattering off Pb208.

UR - http://www.scopus.com/inward/record.url?scp=85128770077&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85128770077&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.128.142501

DO - 10.1103/PhysRevLett.128.142501

M3 - Article

C2 - 35476486

AN - SCOPUS:85128770077

SN - 0031-9007

VL - 128

JO - Physical Review Letters

JF - Physical Review Letters

IS - 14

M1 - 142501

ER -

New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei

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