Study of heavy odd-mass indium isotopes from the (γ, p) reaction on tin

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Abstract A series of bombardments using the 25-MeV bremsstrahlung on enriched isotopes Sn 120 O 2 , Sn 122 O 2 , Sn 124 O 2 , and natural tin have resulted in the discovery of new isotopes In 121 , In 123 , and their isomers. The previously reported activity of In 119 is assigned to In 1198 . The results are as follows: energies of energies of half-lives β rays γ rays (MeV) (MeV) In 119g 2.3 min 1.6 0.77 In 121g 30 sec 0.94 In 123g 10 sec 1.10 In 121m 3.1 min 3.7 In 123m 36 sec 4.6 Decay schemes and level assignments are proposed. All the decay characteristics beautifully fit into shell model systematics, allowing us systematical studies on pertinent nuclear properties. Relative yields of photoreaction on tin are also derived on the basis of these decay sche mes.

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