Fermi motion effects in electroproduction of hypernuclei

0564332 - ÚJF 2023 RIV US eng J - Journal Article
Bydžovský, Petr - Denisova, Daria - Skoupil, Dalibor - Veselý, Petr
Fermi motion effects in electroproduction of hypernuclei.
Physical Review C. Roč. 106, č. 4 (2022), č. článku 044609. ISSN 2469-9985. E-ISSN 2469-9993
R&D Projects: GA ČR GA19-19640S
Institutional support: RVO:61389005
Keywords : electroproduction * hypernuclei * proton momentum
OECD category: Nuclear physics
Impact factor: 3.1, year: 2022
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevC.106.044609

In a previous analysis of electroproduction of hypernuclei the cross sections were calculated using the distorted-wave impulse approximation where the momentum of the initial proton in the nucleus was set to zero (the 'frozen-proton' approximation). In this paper we go beyond this approximation, assuming a nonzero effec-tive proton momentum due to proton Fermi motion inside the target nucleus, discussing also other kinematical effects. To this end we have derived a more general form of the two-component elementary electroproduction amplitude (Chew-Goldberger-Low-Nambu-like) which allows its use in a general reference frame moving with respect to the nucleus rest frame. The effects of Fermi motion were found to depend on kinematics and elementary amplitudes. The largest effects were observed in the contributions from the longitudinal and interference parts of the cross sections. The extension of the calculations beyond the frozen-proton approximation improved the agreement of predicted theoretical cross sections with experimental data, and, once we assumed the optimum on-shell approximation, we were able to remove an inconsistency which was previously present in the calculations.
Permanent Link: https://hdl.handle.net/11104/0336004