Hyperfine splitting constants in the optical transition 4f7 6s2 8S_7/2 ® 4f7 6s6p 6P_5/2 of 151-155Euboldsymbol{{4{f}^{7}} {6{s}^{2}} ;{^{8}{rm S}_{7/2}} to {4{f}^{7}} {6{s}6{p}}; {^{6}{rm P}_{5/2}} {rm of} {^{151-155}{rm Eu}}} isotopes and hyperfine anomaly

摘要

Using the method of laser-induced fluorescence in an atomic beam we have measured the hyperfine splitting constants, A and B, of the ground and excited states of the optical transition 4f 76s 2 8S6s6p 6P_5/2 (564.58 nm) for 151 − 155Eu isotopes. For all isotopes, the magnetic dipole constants of the 6P_5/2 atomic level are determined to a precision better than 0.04%. The A and B constants for the ground state 8S_7/2 of the radioactive 152,154,155Eu were obtained for the first time with a precision better than 0.5%. Our data along with previous ground state hyperfine structure measurements for the stable europium isotopes allow us to determine the hyperfine anomaly for mentioned Eu isotopes.