Regular Article - Experimental Physics
Ytterbium (, n) average cross-sections data near to photodisintegration reaction threshold
Nuclear Physics Lab., School of Physics, Aristotle University of Thessaloniki (AUTH), Thessaloniki, Greece
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Accepted: 10 August 2018
Published online: 19 September 2018
The thick foils activation technique has been applied to estimate the average cross-sections of 168,170,176Yb reaction near to photodisintegration threshold. The cross-sections are derived using the integrated photon flux at any energy range from the reaction threshold to the bremsstrahlung end-point energy. The photon flux is estimated using a calibration photodisintegration set of foils and taking in advance the spectrum linearity at high energies. The p-nuclei 168Yb average cross-section is mb corresponding to MeV. The 170Yb average cross section is mb matching MeV while the 176Yb one is mb corresponding to MeV. The experimental results associate to statistical model simulations performed by the TALYS code. The simulated data of 168Yb ranges 83–139 mb, while 170Yb and 176Yb vary between 89–152 and 84–170mb; which agree with the measurements within uncertainties. The simulated average cross-section of natYb reaction is mb corresponding to energy ranges 6.6-14 MeV. The simulation results based on Lorentzian -strength considerations with the density level of Fermi gas plus the constant temperature model are closest to the average cross-sections measured.
© SIF, Springer-Verlag GmbH Germany, part of Springer Nature, 2018