Question

(1) "33 20. 33 Ast As: 2 76 33 Ag +8 or 15 As (n,r) TA (i),yAs: 2 A3+ ón (ii)?Ge: 33A3+ón - 45+ a on or 1543 (m, an) 7440 ge+ ip* or "A3 (6,p)"ge 27 Ga + ya or 45 AS (",) 7² Ga (iv) Ga: 25 Aston 2. (b) (2 pts) Which of the above reactions would be done with low energy (thermal) neutrons?

Answer 1

Hi thermal neutrons (also called as low energy neutrons) have a much larger effective neutron absorption cross-section for a given nuclide. Hence they often produces a heavier, often unstable isotope. So look at unstable isotopes produced after a bombardment.

76As requires fast neutrons and is somewhat stable

74As has half-life ~18 days, we can consider this as unstable, but requires fast energy neutrons

75Ge is highly unstable (minuts only) and requires low energy neutrons to be produced

72Ga is highly unstable (hours only) and requires low energy neutrons to be produced

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