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Continuous separation and identification of neutronrich neptunium isotopes from heavy-ion reactions by means of the centrifuge system “sisak”

1986; Elsevier BV; Volume: 122; Linguagem: Inglês

10.1016/0022-5088(86)90439-x

1878-2728

H. Tetzlaff, G. Herrmann, N. Kaffrell, Jens Volker Kratz, J. Rogowski, Ν. Trautmann, Μ. Skälberg, Gunnar Skarnemark, J. Alstad, M. M. Fowler, K. J. Moody, W. Brüchle, H. W. Gäggeler, M. Schädel, K. Sümmerer,

Nuclear Materials and Properties

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.