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Abstract
It has been noted in previous experiments that the ratio between the photoneutron and photoproton disintegration channels of 106 Cd might be considerably different from predictions of statistical models. The thresholds of these reactions differ by several MeV and the total astrophysical rate of photodisintegration of 106 Cd, which is mostly produced in photonuclear reactions during the p -process nucleosynthesis, might be noticeably different from the calculated value. In this work the bremsstrahlung beam of a 55.6 MeV microtron and the photon activation technique is used to measure yields of photonuclear reaction products on isotopically-enriched cadmium targets. The obtained results are compared with predictions of statistical models. The experimental yields are used to estimate photodisintegration reaction rates on 106 Cd, which are then used in nuclear network calculations to examine the effects of uncertainties on the produced abundences of p -nuclei.
Highlights
The T< and T> branches of the isospin splitting of the isovector giant dipole resonance (IVGDR) are clearly seen in the isospin-enabled calculations, and the “TALYS+isospin” theoretical photoproton yield is closer to the experimental value, but the experimental result is still not reproduced, meaning that other sources of enhanced photoproton yield have to be considered, such as the giant quadrupole resonance (GQR), the direct proton knockout, and the competition with the (γ,γ ) channel at energies between the p and n separation thresholds
The cross sections of the (γ,p) and (γ,n) reactions on 106Cd calculated using “TALYS+isospin” were used to calculate theoretical photodisintegration rates for this nucleus
Experimental measurement of photonuclear reaction yields on an enriched 106Cd target was performed, and the obtained results were compared with the predictions of statistical models
Summary
The measurement was performed using the photon activation technique, described in detail in [5]. Two identical targets with dimensions 10 × 10 × 0.3 mm were made of isotopically enriched Cd With these targets four irradiations were performed with the average beam current of 0.2–0.3 μA from 10 min to 1 hr for activation of reaction products with short and long halflives. The T< and T> branches of the isospin splitting of the IVGDR are clearly seen in the isospin-enabled calculations, and the “TALYS+isospin” theoretical photoproton yield is closer to the experimental value, but the experimental result is still not reproduced, meaning that other sources of enhanced photoproton yield have to be considered, such as the giant quadrupole resonance (GQR), the direct proton knockout, and the competition with the (γ ,γ ) channel at energies between the p and n separation thresholds (respectively, 7.4 and 10.9 MeV). There are indications of increased diffuseness of the proton optical potential in the neutrondeficit 106Cd, and, a higher probability of penetration through the Coulumb barrier, which is not taken into account by the global optical model in our calculations [1]
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