Nuclear & Particle Physics

Question 1

Recite the Asymmetry term of the SEMF

Answer 1

Question 2

Recite the Coulomb term of the SEMF

Answer 2

Question 3

Recite the Surface term of the SEMF

Answer 3

Question 4

Recite the Pairing term of the SEMF

Answer 4

Question 5

Recite the Volume term of the SEMF

Answer 5

Question 6

List the even-even, even-odd and odd-odd values of a_p

Answer 6

even-even = -11.2MeV/c<sup>2</sup>
even-odd = 0
odd-odd = +11.2MeV/c<sup>2</sup>

Question 7

Recite the Woods-Saxon potential

Answer 7

Question 8

Sketch a graph of the Woods-Saxon potential

Answer 8

Question 9

Give the derivation of the Coulomb term from first principles

Answer 9

Question 10

Recite the Bethe formula (for heavy, slow-moving particles)

Answer 10

Question 11

Recite the Bethe-Bloch formula (for lighter, relativistic particles)

Answer 11

Question 12

Explain with appropriate graphs AND Feynman diagrams why proton-neutron scattering shows similar intensities at high angles as it does low angles

Answer 12

Question 13

Give the mass condition for ß^- decay

Answer 13

M(A , Z) > M(A , Z+1)

Question 14

Give the mass condition for ß⁺ decay

Answer 14

M(A, Z) > M(A, Z-1) + 2m_e

Question 15

Draw the Feynman diagram for free neutron ß^- decay

Answer 15

Question 16

Draw the Feynman diagram for ß⁺ decay of a proton

Answer 16

Question 17

Give the formula for the critical energy below which ionisation losses dominate Bremsstrahlung losses for a LIQUID/SOLID

Answer 17

E_crit = 610MeV/(Z_mat+1.24)

Question 18

Give the formula for the critical energy below which ionisation losses dominate Bremsstrahlung losses for a GAS

Answer 18

E_crit = 710MeV/(Z_mat+0.92)