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241 253 255 NucleI of Alll, Es and Fm were oriented in single crystals of neodyiniulll ethylsulfate at telllperatures down to 11 lllK. Orientation was detected by alpha particle angular distributions. The telllperature dependences of these distributions are consistent with the lowest electronic states of these three actinide ions in the ethylsulfate lattice being silllilar to those of the corresponding lanthanide ions. Thus lllagnetic and axial orientation was observed in Es 3+ (5f10), as in Ho3+ (4f10 ). Quadrupole orientation was observed in A1ll3+ (5f6 ), as in Eu3+ (4f6 ). In F1ll3+(5f 11 ) the orientation was lllagnetic and equatorial, as would be expected frolll the hyperfine interaction in ~r3+ (4f 11 ). The hyperfine interaction constants were deterlllined. 253 For Es we report IAI = 0.26(3) Clll1 , for 241Alll , P = 0.0033(6) Clll1 , and for 255Flll , IBI = 0.035(7) Cllli . The 253Es nuclear lllagnetic dipole lllOlllent was deterlllined to be 1f.L1 = 2.7(13) f.LN. The A1ll+ data are consistent with an anti-shielding constant of Yoo 10 2 , in good agreelllent with theory, i and a shielding factor (12 = 0.7, silllilar to the value for Eu+. The nuclear results show that the sand d waves are in phase for the favored Q decay branch in all three cases. The relative phase of the

Study of partial wave branching in the alpha decay of <sup>241</sup>Am, <sup>253</sup>Es, and <sup>255</sup>Fm