Abstract
Collaboration on strength function measurements and level density determinations is ongoing between the Budapest Prompt Gamma Neutron Activation Analysis and the ELBE Nuclear Physics groups within the framework of EU FP6 EFNUDAT project. The idea is to prove that good theoretical fits to the measured gamma-ray spectra collected in the (n,) and (,') reactions can be carried out using common photon strength and level density functions over a wide spectral energy range from 1 to 10 MeV for the same residual nucleus. Here, preliminary results on the isotope pair of 113,114 Cd are presented for which the neutron capture state in 114 Cd has 1 + or 0 + spin and parity.
Highlights
There seemed to be contradictory photon strength function (PSF) results determined from resonance capture and resonance fluorescence experiments in the past [1, 2]
We found only two stable pairs of nuclei, namely the 77,78Se and 195,196Pt for these studies and showed that the same gamma strength function can be applied for each residual nucleus in describing the observed spectra independent of the exciting reactions used [2,3]
There is no isotopic data on the giant dipole resonance data (GDR) for the 114Cd, which is only 29% of the natural cadmium
Summary
There seemed to be contradictory photon strength function (PSF) results determined from resonance capture and resonance fluorescence experiments in the past [1, 2]. To resolve this problem and to prove that theoretical descriptions of measured gamma-ray spectra collected in the (n, J) and (J,J’) reactions can be described using the same gamma-ray strength functions in a wide spectral energy range from 1 to 10 MeV for the same residual nucleus, we have selected pairs of isotopes for which the neutron capture state has 1– spin and parity, which is the favoured spin and parity that are most probably excited in the (J,J’) reactions on even-even nuclei. The detector efficiencies were measured with calibration standards and simulated with GEANT 4 [5] at higher energies
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