Possible observation of the dineutron in the 159Tb (n, 2n) 158gTb nuclear reaction
International Nuclear Safety Center of Ukraine; Department of Nuclear Physics, Taras Shevchenko National University of Kyiv - St. Volodymyrs‘ka, 60, 01601, Kyiv, Ukraine
Received: 27 January 2016
Accepted: 2 June 2016
Experimental observation of the reaction product was performed with application of the activation technique. Tb specimen of natural composition was irradiated with neutrons of 5.39 and 7 MeV energies. Instrumental spectra of Tb specimen were measured with HPGe spectrometer. An unexpected 944.2 keV γ-ray peak was observed. Other γ-ray lines due to 158gTb decay were identified as well. A bonded dineutron emission with the binding energy within limitations is evidenced by the energy of incident neutrons and by the 158gTb presence in the output channel. The specific nuclear properties of 158Tb as deformed nucleus were discussed to explain a bonded dineutron formation based on theoretical assumptions and calculations, using standard parameters for this mass region.
PACS: 21.10.-k – Properties of nuclei; nuclear energy levels / 21.10.Dr – Binding energies and masses / 27.10.+h – A ≤ 5
© EPLA, 2016