HW Using information from PDGlblgov and nndcbnlgov determine

HW: Using information from PDG.lbl.gov and nndc.bnl.gov determine whether the following decays/reactions are allowed by fundamental symmetries: alpha^0 righrarrow gamma gamma gamma e^+e^- rightarrow y Gamma decay of excited state of ^40Ca at 3353 keV Decay of meson eta rightarrow pi^0 + gamma Decay of meson eta rightarrow pi^0 + gamma

Solution

a.

For first reaction:

Charge: 0. ....> 0+0+0. Then 0 .....> 0. Not violated

Baryon nunmber: 0. ....> 0+0+0. Then 0 .....> 0. not violated

Lefton number; 0. ....> 0+0+0. Then 0 .....> 0. not violated

strangeness:  0. ....> 0+0+0. Then 0 .....> 0. not violated

B.

For second reaction:

Charge: 1-1 .....>. 0. Not violated

Baryon nunmber: 0+0......>0. Not violated

Lefton number: -1+1 .....>. 0. Not violated

Strangeness: 0+0....>0. Not violated

C.

For third reaction:

Ca*(40) .....>. Ca(40)+gamma

This reaction is also obeys the symmetry rules

D.

For Fourth reaction:

Charge: 0. .....> 0+0. Not violated

Baryon nunmber: 0 ...>0+0. Not violated

Lepton number; 0 ...>0+0. Not violated

Strangeness: 0 ...>. 0+0. Not violated