According to the shell model the spin and parity of the two nuclei Sb and Sr are, 125 89 38 respectively, ) and (a) and (c) and (d) and

Complete the following nuclear reaction and identify the missing clement (use periodic tablc) 238U » He+? (1) 92

Calculate BE/A for 12C . Stable and relatively tightly bound, this nuclide is most of natural carbon.

56 Fe is among the most tightly bound of all nuclides. Itis more than 90% of natural iron. Note that 56 Fe has evennumbers of both protons and neutrons. Calculate BE/A , thebinding energy per nucleon, for 56 Fe and compare it withthe approximate value obtained from the graph

Compute the approximate nuclear radius of: (₂) (c) Palladium-46

2. The decay constant, Ai, for the a transition of 243 Am95 () to the various levels of 239NP93 may be estimated from In 1= 48.4 + 2.97 R½ Z¼ - 3.97 Z/T« - 660 o = 0.002la(la+1) where Z is the atomic number of the daughter nucleus, R is the radius of the daughter nucleus in femtometers and approximated by R=1.2XA3, Ta is the kinetic energy of the a - particle in MeV and la is the angular momentum carried by the a- particle. a. Calculate the branching ratio of the 3 transitions. b. Estimate the mean lifetime of the 243Amº5 5- c. The transition from the 239N%93 () to the state proceeds either directly by gamma emission or by gamma emission to the state first or by internal conversion of K-electron, with a conversion coefficient of 2. Use Weisskopf estimates to calculate the lifetime of the 9- excited state.