Calculate Halflife of Alpha Decay: Sm^{147}_{62} to Nd^{143}_{60}

[Denver Dang]

Homework Statement

Hi...

I think I might be staring blind at this one.
I have to calculate the theoretical halflife for the ground state alpha-decay, and compare it to the experimental value.

What is know is that the nuclei Sm^{147}_{62} decays by the emission of a alpha-particle to the ground state of Nd^{143}_{60} with a branching ratio of 100%. The two ground states have same spin and parity. The Q_{\alpha}-value is 2.311 MeV.

Homework Equations

Not sure tbh...

<tex>t_{1/2} = \frac{\ln (2)}{\lambda} = \tau \ln(2)</tex>

The Attempt at a Solution

I dunno... I'm missing something, or then it is just very very simple :/


So I was kinda looking for a hint or something :)


Regards.

 

[Zym]

You need to find an equation which is designed for the alpha decay since you do not have enough information in order to use that standard halflife equation.
[PLAIN]http://img696.imageshack.us/img696/3199/result1o.png

Another thing: You should write Z and A on the left of the atom (as far as I know, bottom right index on the right is for N, so it could cause some confusion).

Since this is on the same level as my nuclear physics, you may be able to help me with my problem:
https://www.physicsforums.com/showthread.php?t=481200