Excitation of Isomeric States
in (, n) and (n, ) Reactions on Eu Isotopes

A. G. Belov, Yu. P. Gangrsky, V. E. Zhuchko, and A. P. Tonchev

Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980 Russia

Received January 8, 1997

Abstract—Isomeric ratios were measured for (, n) and (n, ) reactions on Eu isotopes, which lie at the bound-
ary between spherical and deformed nuclei. Targets from ¹⁵¹Eu and ¹⁵³Eu were irradiated by thermal neutrons
and by bremsstrahlung photons from a microtron with endpoint energies between 13 and 22 MeV. The reactions
under investigation resulted in the excitation of 0^– and 8^– isomeric states in ¹⁵⁰Eu, ¹⁵²Eu, and ¹⁵⁴Eu isotopes.
The spectra of product nuclides were measured to determine the reaction yields. The effect of quadrupole
deformation on the isomeric ratios is discussed.

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