Physics

Problem

In the fission of

^{235}_{92}\mathrm{U}

by a thermal neutron, one of the product nuclei is

^{144}_{56}\mathrm{Ba}

. The other product nucleus is

\mathrm{Y}

, and

k

neutrons are emitted:

^{235}_{92}\mathrm{U} + ^{1}_{0}\mathrm{n} \rightarrow ^{144}_{56}\mathrm{Ba} + \mathrm{Y} + k\,^{1}_{0}\mathrm{n}

. Determine

\mathrm{Y}

and

k

. a)

^{92}_{36}\mathrm{Kr},\;k=2

^{92}_{38}\mathrm{Sr},\;k=3

^{90}_{36}\mathrm{Kr},\;k=2

^{89}_{36}\mathrm{Kr},\;k=3