positrons - 2024 ACF Fall at Claremont Colleges

Question

Two photons are released when these particles annihilate with an electron. For 10 points each:

[10m] Name these particles which are released along with an electron neutrino in beta plus decay.

ANSWER: positrons [prompt on anti-electrons]

[10e] Positron emission occurs when beta plus decay occurs inside this object. This center of the atom contains protons and neutrons.

ANSWER: nucleus [or nuclei]

[10h] Positrons are also formed in this process, in which a boson becomes a particle and its antiparticle. The opposite of annihilation, this process is represented by a squiggly line splitting into two straight lines on a Feynman diagram.

ANSWER: pair production

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Summary


2024 ACF Fall at Claremont Colleges	fall	Y	5	20.00	100%	60%	40%
2024 ACF Fall at Cornell	fall	Y	8	17.50	100%	63%	13%
2024 ACF Fall at Illinois	fall	Y	9	18.89	100%	78%	11%
2024 ACF Fall at Rutgers	fall	Y	7	20.00	100%	86%	14%
2024 ACF Fall at Ohio State	fall	Y	7	18.57	100%	71%	14%
2024 ACF Fall at Washington	fall	Y	6	18.33	100%	83%	0%
2024 ACF Fall at Georgia	fall	Y	10	13.00	100%	20%	10%
2024 ACF Fall at North Carolina	fall	Y	10	16.00	100%	60%	0%

Data


UCLA C	Claremont B	0	10	10	20
UCLA D	Claremont C	10	10	0	20
UCLA B	UCLA E	0	10	0	10
UCSD	Claremont A	10	10	10	30
UCLA A	USC	10	10	0	20