Measurement of the helicity-dependent response in quasi-elastic proton knockout from $^{40}$Ca

Kolar, Tim (avtor), Mihovilovič, Miha (avtor), Požun, Matej (avtor), Širca, Simon (avtor)

The role of the electron-helicity-dependent cross-section term and the structure function $f'_{01}$ in the quasi-elastic $A(\overrightarrow{e}, e' p)$ process was studied. The $f'_{01}$ was measured for proton knockout from the $1\mathrm{d}_{3/2}$ shell in $^{40}$Ca via the $^{40}$Ca$(\overrightarrow{e}, e' p)^{39} K_{g. s.}$ reaction, leaving the residual nucleus in a well-defined state. It requires a longitudinally polarized electron beam and out-of-plane proton detection. This structure function vanishes in the absence of final-state interactions (FSI) involving the ejected proton. Presented are the dependencies of $f'_{01}$ on the missing momentum (closely related to the initial proton’s Fermi momentum) and the angle between the knocked-out proton and the virtual photon momenta. The role of the spin-orbit interaction in FSI through the $\overrightarrow{L}\cdot \overrightarrow{S}$ term in a nuclear optical potential is discussed.

• Jezik: Angleški jezik
• Ključne besede: nuclear physics, nuclear structure, electron scattering, final-state interactions, nuclear optical potential, polarized electron scattering, beam helicity asymmetry
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: 7 str.
• Številčenje: Vol. 871, art. no. 139977
• PID: 20.500.12556/RUL-175984
• UDK: 539.1
• ISSN pri članku: 1873-2445
• DOI: 10.1016/j.physletb.2025.139977
• COBISS.SI-ID: 257424131
• Datum objave v RUL: 17.11.2025

Gradivo je del revije

• Naslov: Physics letters
• Skrajšan naslov: Phys. lett., B
• Založnik: Elsevier Science
• ISSN: 1873-2445
• COBISS.SI-ID: 524694809

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: jedrska fizika