First experimentally-determined <sup>93,94,95</sup>Sr(n,γ)<sup>94,95,96</sup>Sr cross section via the β-Oslo Method
ORAL
Abstract
Our understanding of nuetron-induced reactions on nuclei far from stability has far reaching implications for cosmogenic nucleosynthesis and fundamental nuclear phyics. Direct measurement of the radiative-capture cross section is experimentally inaccessible for these short-lived nuclei; however, indirect methods such as the β-Oslo Method enable the experimentally constraint of key nuclear properties that are inputs for reaction-theory calculations.
At Argonne National Laboratory, an experiment was performed to determine the γ-ray strength function (γSF) and nuclear level density (NLD) for 94,95,96Sr isotopes using high-intensity Californium Rare Isotope Breeder Upgrade beams. Radioactive beams of 94,95,96Rb β decay to populate highly excited states in 94,95,96Sr. The γ decay of these states is measured using total absorption spectroscopy. From the measured γ-ray spectra, the γSF and NLD are extracted using the β-Oslo Method. These experimentally-determined nuclear statistical properties significantly reduced the uncertainty in the resulting Hauser-Feshbach calculated neutron-capture reaction rates. The preliminary results of this work include the NLD, γSF, and 93,94,95Sr(n,γ)94,95,96Sr cross section. Furthermore, this work will shed light on nuclear structure properties for Sr isotopes, leading to significantly improved predictive reaction modeling.
At Argonne National Laboratory, an experiment was performed to determine the γ-ray strength function (γSF) and nuclear level density (NLD) for 94,95,96Sr isotopes using high-intensity Californium Rare Isotope Breeder Upgrade beams. Radioactive beams of 94,95,96Rb β decay to populate highly excited states in 94,95,96Sr. The γ decay of these states is measured using total absorption spectroscopy. From the measured γ-ray spectra, the γSF and NLD are extracted using the β-Oslo Method. These experimentally-determined nuclear statistical properties significantly reduced the uncertainty in the resulting Hauser-Feshbach calculated neutron-capture reaction rates. The preliminary results of this work include the NLD, γSF, and 93,94,95Sr(n,γ)94,95,96Sr cross section. Furthermore, this work will shed light on nuclear structure properties for Sr isotopes, leading to significantly improved predictive reaction modeling.
*Prepared by LLNL under Contract DE-AC52-07NA27344.
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Presenters
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Adriana Sweet
- Lawrence Livermore National Laboratory
- Lawrence Livermore National Lab