Electron capture is a nuclear process in which an atomic nucleus captures an electron, transforming a proton into a neutron.
Feynman diagram shown here:
The initial states of an electron (e-) and a proton (p+) are shown by the vertical line.
The diagonal line shows how an electron is captured by a proton, transforming it into a neutron (n).
The process's emission of an electron neutrino (ve) is shown by the horizontal line.
This image that has been shown in the attachment shows the process of electron capture, in which an electron is taken up by the atomic nucleus, resulting in the emission of an electron neutrino and the conversion of a proton to a neutron.