Different mechanism of two-proton emission from proton-rich nuclei 23Al and 22Mg
oleh: Y.G. Ma, D.Q. Fang, X.Y. Sun, P. Zhou, Y. Togano, N. Aoi, H. Baba, X.Z. Cai, X.G. Cao, J.G. Chen, Y. Fu, W. Guo, Y. Hara, T. Honda, Z.G. Hu, K. Ieki, Y. Ishibashi, Y. Ito, N. Iwasa, S. Kanno, T. Kawabata, H. Kimura, Y. Kondo, K. Kurita, M. Kurokawa, T. Moriguchi, H. Murakami, H. Ooishi, K. Okada, S. Ota, A. Ozawa, H. Sakurai, S. Shimoura, R. Shioda, E. Takeshita, S. Takeuchi, W.D. Tian, H.W. Wang, J.S. Wang, M. Wang, K. Yamada, Y. Yamada, Y. Yasuda, K. Yoneda, G.Q. Zhang, T. Motobayashi
| Format: | Article |
|---|---|
| Diterbitkan: | Elsevier 2015-04-01 |
Deskripsi
Two-proton relative momentum (qpp) and opening angle (θpp) distributions from the three-body decay of two excited proton-rich nuclei, namely Al23→p+p+Na21 and Mg22→p+p+Ne20, have been measured with the projectile fragment separator (RIPS) at the RIKEN RI Beam Factory. An evident peak at qpp∼20 MeV/c as well as a peak in θpp around 30° are seen in the two-proton break-up channel from a highly-excited 22Mg. In contrast, such peaks are absent for the 23Al case. It is concluded that the two-proton emission mechanism of excited 22Mg is quite different from the 23Al case, with the former having a favorable diproton emission component at a highly excited state and the latter dominated by the sequential decay process.