The phrase "a positron which" is correct and usable in written English.
It can be used when providing additional information or clarification about a positron in a sentence.
Example: "A positron which is emitted during beta decay can interact with electrons, leading to annihilation events."
Alternatives: "a positron that" or "a positron which is".
A positron, which may originate in radioactive decay or, more commonly, in the interactions of cosmic rays in matter, usually combines briefly with an electron to form a quasi-atom called positronium.
Some popular theoretical models suggest that if two lingering particles of dark matter collide, they should annihilate to create an ordinary particle and an antiparticle, such as an electron and a positron, which can be observed.
After seconds or few minutes following the injection or inhalation of the radiopharmaceutical, the radio-isotope decays emitting a positron, which moves a short distance before annihilating with an electron.
Positron emitters, such as C, decay via emission of a positron which, upon collision with an electron, emits two 511 keV γ-rays in opposite directions [ 25].
A so called black hole is an electromagnetic positron which attracts neutron stars to its center.
And even more rarely, the passing antiproton (which has a negative charge) captures the positron (which is positive), forming a complete atom of antihydrogen.
But this process also spits out two other particles called positron, which is a form of anti-matter.
Each of them appears on our new interactive map of literary L.A. Atwood has created a serial novel for Byliner, "Positron," which she is writing in real time.
But the spatial resolution is limited by the linear range of the random walk of the positron, which is a mean of 0.2 mm (maximum 2.4 mm) in the case of F. However, lower spatial resolution can be compensated by a higher FDG uptake (hot spot phenomena) so that smaller neoplasms will be detected if their SUVmax is large enough to be differentiated from the background noise (Figs. 1, 2, 3).
Overall, Weyl's treatment is quite modern except for the confusion regarding the positive electron (anti-electron) that at that time was identified with the proton rather than with the positron, which was discovered a few years later.
The experiment also allowed the researchers to calculate the charge of the positron, which is the same – except for the sign of the charge – as that of the electron, within 1 part in a billion.
