The neutron detecor MONA (MOdular Neutron Array) was used to measure neutron spectra originated in the 12C+89Y system. The neutron spectra were measured at six selected angles by TOF method at average laboratory energy of 49.5 MeV. The temperature of the source was determined through off-line analysis and was found to be 1.62 MeV. The level density parameter a, was determined within the framework of a Fermi-gas model, to be equal to a=A/9.4.
PACS numbers: 25.70.Gh, 29.30.Hs
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