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NMR study on AmO$$_{2}$$; Comparison with UO$$_{2}$$ and NpO$$_{2}$$

Tokunaga, Yo; Nishi, Tsuyoshi; Kambe, Shinsaku; Nakada, Masami; Homma, Yoshiya*; Sakai, Hironori; Chudo, Hiroyuki

We have successfully performed an $$^{17}$$O NMR for the first time on Americium dioxide (AmO$$_2$$). We observed a drastic broadening of the NMR spectrum, after a sudden drop of NMR signal intensity below $$T_0$$. These data provide the first microscopic evidence for a phase transition as a bulk property in this system. In the ordered state, we found a spectrum with a triangular line shape, which resembles neither that of UO$$_2$$ nor NpO$$_2$$. It is also suggested that there is considerable damage to the sample induced by self-radiation effects from the alpha decay of $$^{243}$$Am.

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Category:Physics, Multidisciplinary

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