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Measurement of the 40Ar(e,$$\hbox {e}^{\prime }$$) elastic scattering cross section with a novel gas-jet target

https://doi.org/10.1140/epja/s10050-025-01623-4

Littich, M.; Doria, L.; Brand, P.; Achenbach, P.; Aulenbacher, S.; Bacca, S.; Bernauer, J_C; Biroth, M.; Bonaventura, D.; Bosnar, D.; et al (July 2025, The European Physical Journal A)

Abstract We report on a measurement of elastic electron scattering on argon performed with a novel cryogenic gas-jet target at the Mainz Microtron accelerator MAMI. The luminosity is estimated with the thermodynamical parameters of the target and by comparison to a calculation in distorted-wave Born approximation. The cross section, measured at new momentum transfers of 1.24 $$\hbox {fm}^{-1}$$

{fm}^{- 1}

and 1.55 $$\hbox {fm}^{-1}$$

{fm}^{- 1}

is in agreement with previous experiments performed with a traditional high-pressure gas target, as well as with modernab-initiocalculations employing state-of-the-art nuclear forces from chiral effective field theory. The nearly background-free measurement highlights the optimal properties of the gas-jet target for elements heavier than hydrogen, enabling new applications in hadron and nuclear physics.

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