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arXiv · 1604.01244

Complete kinematical study of the 3$\alpha$ breakup of the 16.11 MeV state in $^{12}$C

K. L. Laursen·H. O. U. Fynbo·O. S. Kirsebom·K. O. Madsbøl·K. Riisager
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Abstract

The reaction $^{11}B+p$ has been used to populate the $(J^{\pi},T)=(2^+,1)$ state at an excitation energy of 16.11 MeV in $^{12}$C, and the breakup of the state into three $\alpha$ particles has been studied in complete kinematics. A two-step breakup model which includes interference effects is found to provide the most accurate description of the experimental data. The branching ratio to the ground state of $^8$Be is determined to be 5.1(5)% in agreement with previous findings, but more precise by a factor of two, while the decay to the first-excited state in $^8$Be is found to be dominated by $d$-wave emission.

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K. L. Laursen, H. O. U. Fynbo, O. S. Kirsebom, K. O. Madsbøl, K. Riisager. 2016-04-05. Complete kinematical study of the 3$\alpha$ breakup of the 16.11 MeV state in $^{12}$C. https://doi.org/10.1140/epja/i2016-16271-2

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