The (nth, α) reaction on 147Sm, 151, 153Eu and Yb isotopes |
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Authors: | A Emsallem R Chery M Asghar |
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Institution: | Institut de Physique Nucléaire, Lyon, France;Institut Laue-Langevin, BP no. 156, 38042 Grenoble Cédex, France |
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Abstract: | The (n, α) reaction has been studied using the highly pure thermal neutron beam from the 87m curved neutron guide at the Grenoble high flux reactor. The 147Sm(n, α)144Nd reaction showed up five lines corresponding to the ground and the first four excited states of the final nucleus. It is shown that ≈53 % of the 581 μb (n, α) cross section comes from the neutron capture by a bound level of the 148Sm compound nucleus. The 8.7 ± 3 μb cross section of 151Eu(n, α)148Pm seems to consist principally of at least two lines corresponding to the ground and the second excited states of 148Pm. The 153Eu(n, α)149Pm cross section for thermal neutrons is ≦ 1 μb. The lower limits of (n, α) thermal neutron cross section values on ytterbium isotopes are ≈ 20 to 40 times lower than the published data. |
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Keywords: | Nuclear reactions |
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