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[en] The invention concerns a neutron detector adapted for use in the core instrumentation of nuclear reactors. It comprises an emitter electrode which, upon irradiation with neutrons, emits electrons by means of (n,γ) processes, a collector electrode, and a dielectric disposed between the emitter and the collector electrode. Thulium 169 or terbium 159 is used as the emitter substance. With this emitter substance a prompt signal is obtained, the magnitude of which hardly changes for years;any delayed signals that may build up and any interference currents due to them are so small that they can be compensated for by simple, known means. (Official Gazette)

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[en] The magnetic dipole (M1) response of the ¹⁶⁹Tm nucleus is investigated from a theoretical point of view. The theoretical tool used in this study is the Rotational Invariant Quasiparticle Phonon Nuclear Model (RI-QPNM) which gives a possibility to eliminate spurious contributions in the M1 spectrum. In the framework of this model, both the low-lying and high-lying parts of the M1 excitation spectrum of ¹⁶⁹Tm are calculated. The result shows that the low-lying excitations have almost pure orbital character and can be interpreted as scissors mode, whereas the high-lying transitions can be read as spin-flip mode because of its spin nature. The reduced transition probability summed up in the energy range 2–4 MeV is found to be $B(M1\uparrow )=3.040{\mu }_N^2$ which agrees with the available experimental data. The fragmentation of the low-energy M1 strength is also well reproduced. This is also the first study in which both the low-lying and high-lying M1 spectrum of the ¹⁶⁹Tm nucleus is theoretically investigated.

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[en] Cross sections of evaporation residues produced in ¹²C + ¹⁶⁹Tm reaction have been measured by recoil-catcher technique followed by off-line gamma-ray spectrometry in the beam energy range of 60 to 84 MeV. The incomplete fusion component was clearly seen in the case of alpha-transfer and alpha-emission products. (author)