1. Search for |$\alpha$| condensed states in |$^{13}$|C using |$\alpha$| inelastic scattering.
- Author
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Inaba, K, Sasamoto, Y, Kawabata, T, Fujiwara, M, Funaki, Y, Hatanaka, K, Itoh, K, Itoh, M, Kawase, K, Matsubara, H, Maeda, Y, Suda, K, Sakaguchi, S, Shimizu, Y, Tamii, A, Tameshige, Y, Uchida, M, Uesaka, T, Yamada, T, and Yoshida, H P
- Subjects
DIPOLE moments ,BORN approximation ,QUANTUM theory ,ORTHOGONAL decompositions ,ORTHOGONAL arrays - Abstract
We searched for the |$\alpha$| condensed state in |$^{13}$| C by measuring the |$\alpha$| inelastic scattering at |$E_\alpha = 388$| MeV at forward angles including 0 |$^\circ$|. We performed a distorted-wave Born approximation calculation with the single-folding potential and multipole decomposition analysis to determine the isoscalar transition strengths in |$^{13}$| C. We found a bump structure around |$E_x = 12.5$| MeV due to the isoscalar monopole (|$IS0$|) transition. A peak-fit analysis suggested that this bump consisted of several |$1/2^-$| states. We propose that this bump is due to the mirror state of the 13.5 MeV state in |$^{13}$| N, which dominantly decays to the |$\alpha$| condensed state in |$^{12}$| C. It was speculated that the |$1/2^-$| states around |$E_x = 12.5$| MeV were candidates for the |$\alpha$| condensed state, but the |$3\alpha + n$| orthogonality condition model suggests that the |$\alpha$| condensed state is unlikely to emerge as the negative parity states. We also found two |$1/2^+$| or |$3/2^+$| states at |$E_x = 14.5$| and 16.1 MeV excited with the isoscalar dipole (|$IS1$|) strengths. We suggest that the 16.1 MeV state is a possible candidate for the |$\alpha$| condensed state predicted by the cluster model calculations on the basis of the good correspondence between the experimental and calculated level structures. However, the theoretical |$IS1$| transition strength for this state is significantly smaller than the measured value. Further experimental information is strongly desired to establish the |$\alpha$| condensed state in |$^{13}$| C. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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