$(14.)$ Classify the following decays according to degree of forbiddenness:

$($a$){?}^{89}Sr(\frac{5}{(2{)}^{+}}){?}^{89}Y(\frac{1}{(2{)}^{-}})$

$($b$){?}^{36}Cl(2^{+}){?}^{36}Ar(0^{+})$

$($c$){?}^{26}Al(5^{+}){?}^{26}M{g}^{**}(2^{+})$

$($d$){?}^{26}Si(0^{+}){?}^{26}A{l}^{**}(0^{+}){?}^{26}Mg(0^{+})$

$($e$){?}^{97}Zr(\frac{1}{(2{)}^{+}}){?}^{97}N{b}^{**}(\frac{1}{(2{)}^{-}})$

PROBLEMS

Each of the following nuclei emits a photon in a $$ transition between at excited state and the ground state. Given the energy of the photon, find thes energy of the excited state and comment on the relationship between the nuclear recoil energy and the experimental uncertainty in the photos energy: $($a$)320\mathrm{.}08419+-0\mathrm{.}00042$keV in ${?}^{51}V$; $($b$)1475\mathrm{.}786+-0\mathrm{.}005$keV; ${?}^{110}Cd$; $($c$)1274\mathrm{.}545+-0\mathrm{.}017$keV in $22$ Ne ; $($d$)3451\mathrm{.}152+-0\mathrm{.}047$keV in ${?}^{8}Fe($e$)884\mathrm{.}54174+-0\mathrm{.}00074$keV in ${?}^{192}Ir.$