New and very accurate data of isotope shifts and relative isotope shifts in <sup>234</sup>U, <sup>236</sup>U, <sup>238</sup>U are presented. The invariance of the relative isotope shift, for the transitions we have investigated, supports the hypothesis that the so-called specific mass effect is negligible in uranium.
© 1976 Optical Society of America
J. M. Gagné, S. Nguyen Van, J. P. Saint-Dizier, and P. Pianarosa, "Isotope shift of 234U, 236U, 238U in UI," J. Opt. Soc. Am. 66, 1415-1416 (1976)