The p-process in type-II supernovae

Radiative capture reactions play a pivotal role for our understanding of the origin of the elements in the cosmos. Recoil separators provide an effective way to study these reactions, in inverse kinematics, and take advantage of the use of radioactive ion beams. However, a limiting factor in the study of radiative capture reactions in inverse kinematics is the momentum spread of the product nuclei, which can result in an angular spread larger than the geometric acceptance of the separator. The DRAGON facility at TRIUMF is a versatile recoil separator, designed to study radiative capture reactions relevant to astrophysics in the A ∼ 10–30 region. In this work we present the first attempt to study with DRAGON a reaction, 6 Li( α , γ ) 10 B, for which the recoil angular spread exceeds DRAGON’s acceptance. Our result is in good agreement with the literature value, showing that DRAGON can measure resonance strengths of astrophysically important reactions even when not all the recoils enter the separator.

Beyond the acceptance limit of DRAGON: The case of the 6Li(α,γ)10B reaction

Compensation Mechanism of End Pose Error of Industrial Robot Based on Inverse Kinematics Conversion Method

The study of stellar burning began just over 100 years ago. Nonetheless, we do not yet have a detailed picture of the nucleosynthesis within stars and how nucleosynthesis impacts stellar structure and the remnants of stellar evolution. Achieving this understanding will require precise direct measurements of the nuclear reactions involved. This report summarizes the status of direct measurements for stellar burning, focusing on developments of the last couple of decades, and offering a prospectus of near-future developments.

The status and future of direct nuclear reaction measurements for stellar burning

The present paper proposes an improved version of the $\ensuremath{\alpha}$-nucleus optical model potential ($\ensuremath{\alpha}$-OMP), in which the real part of the potential is determined by the double-folding calculation using the density-dependent CDM3Y1 interaction plus a repulsive potential. The imaginary part of the $\ensuremath{\alpha}$-OMP is treated by a Woods-Saxon form with energy-dependent depth, while its real part is corrected by including the contribution of the dispersion relation derived from the strong variation of the potential at energies in the vicinity of the Coulomb barrier. The proposed potential is validated by calculating the $(\ensuremath{\alpha},n)$ and $(\ensuremath{\alpha},\ensuremath{\gamma})$ cross sections on different target nuclei and the obtained results are compared with those predicted by the recent $\ensuremath{\alpha}$-OMP suggested by Avrigeanu, as well as the available experimental data. The impacts of the energy-dependent imaginary part and the real dispersive term on the $\ensuremath{\alpha}$-induced cross sections are also investigated. The results obtained show that the proposed $\ensuremath{\alpha}$-OMP together with that of Avrigeanu describe reasonably well the experimental cross sections of all $(\ensuremath{\alpha},n)$ reactions being considered. In addition, the imaginary part of the proposed potential has a strong energy-dependent effect on the $\ensuremath{\alpha}$-induced cross section in the energy region below the Coulomb barrier, in particular for radiative $\ensuremath{\alpha}$-capture reactions. Two potentials also describe well the cross sections of $(\ensuremath{\alpha},\ensuremath{\gamma})$ reactions after rescaling the radiative $\ensuremath{\gamma}$ width. This leads to our conclusion that the present $\ensuremath{\alpha}$-OMP can provide precise $\ensuremath{\alpha}$ widths for the study of reactions relevant to the production of $p$ nuclei, and therefore more intensive theoretical research on the radiative strength functions is required. 

Improved version of the 
α
-nucleus optical model potential for reactions relevant to the 
γ
 process

First measurement in the Gamow window of a reaction for the γ-process in inverse kinematics: 76Se(α,γ)80Kr

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First measurement in the Gamow window of a reaction for the γ-process in inverse kinematics: 76Se(α,γ)80Kr