D. A. SCOTT

When deriving resonance strengths using the thick-target yield approximation, for very narrow resonances it may be necessary to take beam energy straggling into account. This applies to gas targets of a few keV width, especially if there is some additional structure in target stoichiometry or detection efficiency. The correction for this effect...

We report on measurements of resonance strengths and energies for the Ep = 151 and 193 keV resonances in the 18O(p,gamma)15N and 17O(p,gamma)14N reactions, respectively, obtained during commissioning of a new setup for alpha-particle detection studies at the LUNA underground laboratory. Our values, omegagamma(151) = 164.2 ± 0.9 stat+12.1−11.7...

Classical novae are important contributors to the abundances of key isotopes, such as the radioactive 18F, whose observation by satellite missions could provide constraints on nucleosynthesis models in novae. The 17O(p,gamma)18F reaction plays a critical role in the synthesis of both oxygen and fluorine isotopes but its reaction rate is not...

Classical novae are important contributors to the abundances of key isotopes, such as the radioactive 18F, whose observation by satellite missions could provide constraints on nucleosynthesis models in novae. The 17Oðp; Þ18F reaction plays a critical role in the synthesis of both oxygen and fluorine isotopes, but its reaction rate is not well...

The 22Ne(p,gamma)23Na reaction takes part in the neon-sodium cycle of hydrogen burning. This cycle is active in asymptotic giant branch stars as well as in novae and contributes to the nucleosythesis of neon and sodium isotopes. In order to reduce the uncertainties in the predicted nucleosynthesis yields, new experimental efforts to measure the...

The direct measurement of reaction cross sections at astrophysical energies often requires the use of solid targets of known thickness, isotopic composition, and stoichiometry that are able to withstand high beam currents for extended periods of time. Here, we report on the production and characterisation of isotopically enriched Ta2O5 targets...