- #1

- 45

- 0

## Homework Statement

the nucleus of

^{227}Th decays to

^{223}Ra and [tex]\alpha[/tex]. the daughter nucleus is left in a short lived excited state and decays down to the ground state with the emission of an 80 keV gamma ray. the natural line width of this gamma ray is .6 keV. what is the lifetime of the excited state of the

^{223}Ra nucleus?

## Homework Equations

[tex]\Delta[/tex]E [tex]\Delta[/tex]t = [tex]\hbar[/tex]/2 where [tex]\Delta[/tex]t is the lifetime [tex]\tau[/tex]

## The Attempt at a Solution

can i just solve for [tex]\Delta[/tex]t as the lifetime of the excited state? letting [tex]\Delta[/tex]E = 80 keV? Im not sure what to do with the line width, it's not in my book anywhere.