Atomic and Nuclear Physics Answers

Compute the mass defects of (a) 32S; (b) 20F; (c) 238U. 

The highest energy a particle emitted in the decay of 238U to 234Th is 

4196 &- 4 keV. From this information and the known mass of 238U, compute 

the mass of 234Th

 nuclear charge distribution more realistic than the uniformly charged 

distribution is the Fermi distribution, p(r) = po{l + exp[(r - R)/a]}-'. 

(a) Sketch thrs distribution and compare with Figure 3.4. (b) Find the value 

of a if t = 2.3 fm. (c) What is the significance of the parameter R? (d) 

Evaluate (r ') according to this distribution. 

An ionization chamber is connected to an electrometer of capacitance 0.5 pF and voltage sensitivity of 4 divisions. Calculate the number of ion pairs required and the energy of the alpha particle.

How many 5 MeV alpha particles are required to deposit a total energy of 1 J?

Alpha particle of energy 5 MeV pass through an ionization chamber at the rate of 10 per second. Assuming all the energy is used in producing ion pairs, calculate the current produced. (35 eV is required for producing an ion pair and e = 1.6×10-19 C

A 5-MeV photon produces a positron-electron pair in a lead shield. If both particles are of equal energy, how far will they travel in the shield?

Calculate the energy of a 1 MeV gamma-ray photon after Compton scattering through 90 degrees

An important radioisotope for industrial and medical applications is 60Co with a half life of 5.2 years and a molar mass of 60 grams/mole. What minimum initial mass of 60Co is required for a sealed cource of 60Co to have an activity of 10 Ci after 30 months where 1Ci=3.7x1010 Bq. 

A beam of high energy neutrons is scattered from a metal lattice, where the space between the nuclei is around 0.4nm. To see the quantum diffraction effect, the kinetic energy of electron must be around ??