HW #3 (129A), due Oct 11, 4pm
1. Which of the following processes are allowed by the strong interactions?
If not allowed, what conservation law forbids the process?
(a) p→e+π0
(b) µ−
→e−e−e+
(c) pp →pnπ+
(d) pn →ppp¯n
(e) π+p→ΛK+
(f) np →Σ0K+
(g) e+e−
→pn
(h) e−p→π0n
(i) π−p→K0n
(j) π0→K+K−
2. The mass of the charged pion was measured to be 140 MeV/c2. What is
the range of the force mediated by it?
3. Solve Problem 2.1 of Cahn–Goldhaber.
4. Using “Table of Isotopes,” by Richard B. Firestone, Wiley-Interscience,
identify low-lying levels in 14C, 14N, and 14O that correspond to I= 0 and
I= 1 multiplets.