Share this thread: 
#1
Apr1014, 02:37 AM

P: 106

So i have a question regarding a homework question i'm working on which suggest a neutral pion travelling with velocity v decays into two gamma rays of equal theta to the normal and they of course have velocity c. It then asks to prove that
v= cos theta Which kind of confuses me. I mean if we assume that the gamma rays travel off at an angle and the distance they travel in time t is at a right angle to the distance the pion would have travelled at velocity v, we can form a right handed triangle with adjacent length vt and hypotenuse ct, but how can we just assume that you can just go north of vt and it will find ct right at the end of the hypotenuse and hence use this trigonometric rule. Thanks. 


#2
Apr1014, 02:38 AM

P: 106

Oh wait is it due to conservation of momentum so the vertical components of the c's must cancel and therefore the horizontal components must be the same length? Cheers.



#3
Apr1114, 05:55 PM

Mentor
P: 11,819




Register to reply 
Related Discussions  
Neutral pion 2 gamma decay question  High Energy, Nuclear, Particle Physics  0  
Simulate Gamma Rays from Radioactive Decay  General Physics  1  
Pion decays into gamma rays. Find the energy and angle  High Energy, Nuclear, Particle Physics  2  
Why do gamma rays accompany other kinds of decay?  High Energy, Nuclear, Particle Physics  3  
That the two gamma rays are only one possible decay mode?  Quantum Physics  9 