decays & interactions

Question 1

when does α decay occur

Answer 1

unstable heavy nucleus
too many nucleons

Question 2

what happens in α decay

Answer 2

emit 2prot & 2neut
He nucleus

Question 3

β- decay:

Answer 3

neutron –> proton

emits:
electron, anti-electron neutrino

exchange particle: W- boson

Question 4

β+ decay:

Answer 4

proton –> neutron

emits:
positron, electron neutrino

exchange particle: W+ boson

Question 5

electron capture:

Answer 5

e- absorbed by a proton in the nucleus.

emits neutron & electron neutrino

exchange particle: W+ boson

Question 6

β- decay exchange particle:

Answer 6

W- boson

Question 7

β+ decay exchange particle:

Answer 7

W+ boson

Question 8

electron capture exchange particle:

Answer 8

W+ boson

Question 9

when does strangeness not have to be conserverd?

Answer 9

when decay is via weak interaction
can change by +-1

Question 10

strong interaction decay:

Answer 10

hadron break down into smaller hadrons

Question 11

characteristics of strong interaction decay:

Answer 11

-all quark flavours conserved (uds)

-no leptons produced

-mediated by gluons

Question 12

strong interaction decay mediated by:

Answer 12

gluons

Question 13

β- & β+ decay are ___ interaction

Answer 13

weak

Question 14

A 125 53 I nuclide decays by electron capture to form a tellurium nuclide.
State two differences between the constituents of the iodine nucleus and the tellurium nucleus it decays into.

Answer 14

tellurium has 1 more neutron
tellurium has 1 fewer proton