The fl-decay energy of the neutron-rich isotopes 148Ba, 14SLa and ~5~pr has been measured at the Institute Laue-Langevin (ILL). The t4aBa-and ~48La-nuclei were produced using a high-temperature ion source at the OSTIS separator of this institute, whereas samples of ~51pr were obtained from the thermal fission of 239pu, used as a target in the mass separator LOHENGRIN. At both instruments, fiT-coincidences were measured with a plastic scintillator telescope and a Ge(I)-detector, together with//-singles and 7-singles spectra. The//-spectra emitted in coincidence with 44~)-lines in the decay of these nuclei have been evaluated. From their endpoint energies, the following Qa-values have been obtained: Qa(lgSBa) = 5115_ 60 keV; Qp(14SLa) = 7255_ 55 keV; Qp(~5 tPr)= 4170 +_ 75 keV. Using these results, the nuclear masses A of these nuclei can be calculated with a relative error AA/A~-5.10 -7. In addition, the two-neutron separation energies and the mass excesses have been derived; the results are compared with recent predictions of theoretical mass calculations.
The Q/~-values of l~ 1~176 and lo1,102y have been measured for the first time at the mass separator ISOLDE by means of/~7-coincidence techniques with a plastic scintillation detector telescope and a large Ge(HP)-detector. For some of these nuclei, also new details of their decay schemes could be derived from the measured fl-decay properties. The experimental results are discussed, as far as the systematics of two-neutron separation energies derived from them is concerned. In addition, the nuclear masses deduced from these Q,-values are compared with the predictions of recent mass calculations.
Transfer reactions at two near-barrier energies for the systems32S +100,101Ru have been studied. Differential cross sections have been extracted for a large variety of channels, with a set-up yielding good mass, nuclear charge and energy resolutions. A steeper decrease of the measured angular distributions at backward angles with respect to the prediction of a semiclassical theory is interpreted as a loss of transfer flux feeding more complex channels and/or fusion. Coupled channels calculations, which use the transfer form factors derived from the experiment, reproduce the fusion cross sections at sub-barrier energies. Multi-nucleon transfer seems to play an essential role for the fusion process, as evidenced by the found strong correlations. A systematic comparison is made with the systems33S +90,91,92Zr, which have been the object of a previous experimental study with the same set-up
The//-decay of neutron-rich fission products with mass numbers A = 107, 108 and 109 has been investigated at the mass separator LOHENGRIN of the Institute Laue-Langevin (ILL) in Grenoble by measuring //7-coincidences with a large plastic scintillator telescope and a Ge(I)-detector. The //-decay energies of 8 nuclei were obtained from the evaluation of more than 40//-endpoint energies. For the nuclei lo7 Mo, 1~ l~ 1~ and I~ the fl-decay energies were determined for the first time; the experimental error in the decay energy of three daughter nuclei was considerably reduced, tn addition, the two-neutron separation energies and the nuclear mass excesses were calculated from these experimental Qp-values and compared with different mass predictions.
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