Abstract
Neutron-rich neptunium isotopes formed in direct transfer reactions between 136Xe projectiles and targets of 244Pu have been separated from other reaction products with the on-line liquid-liquid extraction system SISAK. A four-detector delay method was used to determine the half-lives of the previously unknown isotopes 243Np and 244Np. From the decay of the 287.4 keV γ-line a half-life of 1.8 ± 0.3 min was determined for 243Np. From the decay curves of the γ-lines at 162.7 and 216.7 keV, which fit into the known level scheme of 244Pu, a half-life of 2.5 ± 0.3 min results for 244Np.
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