Particle And Nuclear Phsyics Flashcards Preview

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Flashcards in Particle And Nuclear Phsyics Deck (40):
1

State quark composition of Baryon

qqq

2

What is the quark composition of a K- meson

Ūs

3

What is the equation of electron capture

P+e-~n+Ve

4

Quark structure of K^0

D š

5

Quark structure of proton

uud

6

Quark structure of neutron

udd

7

Charge of pion +

+1

8

What is a sigma+ particle and what's its charge and number

Baryon with Baryon number +1 and charge +1

9

Give one property of an antiparticle that is same for its corresponding particle and one difference

Same rest mass energy
Different charge

10

Name two baryons

Proton
Neutron

11

State one characteristic of a strange particle that makes it different from a particle that is not strange

Has a strange quark

12

Give one difference between negative muon and an electron

Different rest mass
Same charge (negative )

13

Give a difference between hadron and leptons

Leptons do not feel strong force

14

What are the differences between mesons and baryons

Baryons made from 3 quarks whereas mesons is a quark antiquark pair
Baryon number is +1/-1 mesons is 0

15

What property defines a hadron

Feels the strong force

16

What is the exchange particle in the strong, weak and electromagnetic force

Electromagnetic- photon
Strong force - gluon
Weak force - w+/w-

17

What is an isotope

Forms of the same element that have the same number of protons but a different number of neutrons

18

What is the nature of an alpha particle

2 protons , 2 neutrons

19

What is the sigma + particle and what does it contain

It is a baryon with 3 quarks which is affected by the weak force and will eventually decay into a proton

20

Name a force that acts between the up quark and an electron . How does this operate

The weak force uses a W+/- exchange particle to transfer energy . This then leads to the creation of a new particle .

21

Explain why two photons are formed instead of a single photon when helium nucleus annihilates with an anti helium nucleus

Momentum is conserved
So need two photons travelling in different directions

22

What is decay of a neutron equation

N~p+b+Ve

23

What is meant by specific charge

Ratio of charge to mass of nucleus
Measured in Ckg-1

24

Lepton number of electron and anti-electron

e- = 1 e+=-1

25

Lepton number of ve with hat

-1

26

Charge of ve and ve with hat

Ve = +1
Ve with hat = -1

27

What is the k0 and how does it decay

It is a meson with a strange quark so decays with the weak interaction

28

Which constituent of an atom has the largest specific charge

Electron

29

Why is there a minimum energy of the y photon for this conversion to take place
What will happen if y photon has slightly more energy

To provide enough energy for the rest mass
Any extra energy will provide the particles with extra kinetic energy

30

What is the quark structure of anti K0 meson

D with hat s

31

Pion + quark structure

U D with hat

32

Pion- quark structure

D U with hat

33

Pion 0 quark structure

Uū or dd with hat

34

Kaon - quark structure

S ū

35

Sigma - and sigma 0 strangeness

-1

36

What can the kaon decay into

Pions

37

What is fundamental about the photon

No charge
Massless

38

Positron emission equation

P + e- ~ n+ ve

39

What is meant by electron capture

An atomic electron that interacts with a proton in the nucleus via the weak interaction

40

What is equation for k- meson decay

K-~ pi0+e-+v with hat