Determination of the 27Al Neutron Distribution Radius from a Parity-Violating Electron Scattering Measurement (CROSBI ID 308219)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Androić, Darko ; Armstrong, D. S. ; Bartlett, K. ; Beminiwattha, R. S. ; Benesch, J. ; Benmokhtar, F. ; Birchall, J. ; Carlini, R. D. ; Cornejo, J. C. ; Covrig Dusa, S. ; Dalton, M. M. ; Davis, C. A. ; Deconinck, W. ; Dowd, J. F. ; Dunne, J. A. ; Dutta, D. ; Duvall, W. S. ; Elaasar, M. ; Falk, W. R. ; Finn, J. M. ; Forest, T. ; Gal, C. ; Gaskell, D. ; Gericke, M. T. W. ; Gray, V. M. ; Grimm, K. ; Guo, F. ; Hoskins, J. R. ; Jones, D. C. ; Jones, M. K. ; Kargiantoulakis, M. ; King, P. M. ; Korkmaz, E. ; Kowalski, S. ; Leacock, J. ; Leckey, J. ; Lee, A. R. ; Lee, J. H. ; Lee, L. ; MacEwan, S. ; Mack, D. ; Magee, J. A. ; Mahurin, R. ; Mammei, J. ; Martin, J. W. ; McHugh, M. J. ; Meekins, D. ; Mesick, K. E. ; Michaels, R. ; Micherdzinska, A. ; Mkrtchyan, A. ; Mkrtchyan, H. ; Narayan, A. ; Ndukum, L. Z. ; Nelyubin, V. ; Nuruzzaman ; van Oers, W. T. H. ; Owen, V. F. ; Page, S. A. ; Pan, J. ; Paschke, K. D. ; Phillips, S. K. ; Pitt, M. L. ; Radloff, R. W. ; Rajotte, J. F. ; Ramsay, W. D. ; Roche, J. ; Sawatzky, B. ; Ševa, Tomislav ; Shabestari, M. H. ; Silwal, R. ; Šimičević, Neven ; Smith, G. R. ; Solvignon, P. ; Spayde, D. T. ; Subedi, A. ; Suleiman, R. ; Tadevosyan, V. ; Tobias, W. A. ; Tvaskis, V. ; Waidyawansa, B. ; Wang, P. ; Wells, S. P. ; Wood, S. A. ; Yang, S. ; Zang, P. ; Zhamkochyan, S. ; Christy, M. E. ; Horowitz, C. J. ; Fattoyev, F. J. ; Lin, Z.
Qweak Collaboration
engleski
Determination of the 27Al Neutron Distribution Radius from a Parity-Violating Electron Scattering Measurement
We report the first measurement of the parity- violating elastic electron scattering asymmetry on 27Al. The 27Al elastic asymmetry is A_PV = 2.16 +- 0.11 (stat) +- 0.16 (syst) ppm, and was measured at <Q^2> =0.02357 +- 0.0001 GeV^2, <theta_lab> = 7.61 +- 0.02 degrees, and <E_lab> = 1.157 GeV with the Qweak apparatus at Jefferson Lab. Predictions using a simple Born approximation as well as more sophisticated distorted-wave calculations are in good agreement with this result. From this asymmetry the 27Al neutron radius R_n = 2.89 +- 0.12 fm was determined using a many-models correlation technique. The corresponding neutron skin thickness R_n-R_p = -0.04 +- 0.12 fm is small, as expected for a light nucleus with a neutron excess of only 1. This result thus serves as a successful benchmark for electroweak determinations of neutron radii on heavier nuclei. A tree-level approach was used to extract the 27Al weak radius R_w = 3.00 +- 0.15 fm, and the weak skin thickness R_wk - R_ch = -0.04 +- 0.15 fm. The weak form factor at this Q^2 is F_wk = 0.39 +- 0.04.
parity vialation ; elastic electron scattering asimmetry ; neuton skin thickness
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Podaci o izdanju
128
2022.
132501
7
objavljeno
0031-9007
1079-7114
10.1103/PhysRevLett.128.132501
