Development of the solid deuteron target for measuring the gamma-decay probability of the 3<sup>-</sup><sub>1</sub> state in <sup>12</sup>C with deuteron inelastic scattering
ORAL
Abstract
The triple alpha (3α) reaction, which produces 12C from three α particles, is one of the most important reactions in nucleosynthesis in the universe. The radiative-decay probabilities of the 3α resonance states are crucial physical quantities that determine the 12C production rate. At high temperatures above 109 K, high-lying excited states e.g., 3-1 and 2+2 states in 12C play an important role.
In this study, we aim to precisely determine the radiative-decay probability of the 3-1 state through simultaneous measurement of the scattered 12C and the recoil deuteron emitted from the inelastic deuteron scattering under inverse kinematics conditions. We have already conducted a simulation study to search for the optimum experimental condition. We considered utilizing solid deuterium, which offers a high S/N ratio, as a deuteron target. The target should have a certain surface area to avoid backgrounds due to beam halo. Additionally, from the perspective of angular resolution of recoiled deuterons, it is necessary to have a thin target thickness. Therefore, we have undertaken the challenge of developing a thin and large-area solid deuterium target with dimensions of about 15 mm × 15 mm and a thickness of 0.5 mm. Because the solid deuterium might melt due to heating by the beam, we have examined the maximum beam intensity that the solid deuterium target can withstand using the heat conduction equation. In this talk, we will report on the current status of our development efforts.
In this study, we aim to precisely determine the radiative-decay probability of the 3-1 state through simultaneous measurement of the scattered 12C and the recoil deuteron emitted from the inelastic deuteron scattering under inverse kinematics conditions. We have already conducted a simulation study to search for the optimum experimental condition. We considered utilizing solid deuterium, which offers a high S/N ratio, as a deuteron target. The target should have a certain surface area to avoid backgrounds due to beam halo. Additionally, from the perspective of angular resolution of recoiled deuterons, it is necessary to have a thin target thickness. Therefore, we have undertaken the challenge of developing a thin and large-area solid deuterium target with dimensions of about 15 mm × 15 mm and a thickness of 0.5 mm. Because the solid deuterium might melt due to heating by the beam, we have examined the maximum beam intensity that the solid deuterium target can withstand using the heat conduction equation. In this talk, we will report on the current status of our development efforts.
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Presenters
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Yuya Honda
- Department of Physics, School of Science, Osaka University
- Department of Physics, Osaka University