Different mechanism of two-proton emission from proton-rich nuclei 23Al and 22Mg
- Ma, Y.G.
- Fang, D.Q.
- Sun, X.Y.
- Zhou, P.
- Togano, Y.
- Aoi, N.
- Baba, H.
- Cai, X.Z.
- Cao, X.G.
- Chen, J.G.
- Fu, Y.
- Guo, W.
- Hara, Y.
- Honda, T.
- Hu, Z.G.
- Ieki, K.
- Ishibashi, Y.
- Ito, Y.
- Iwasa, N.
- Kanno, S.
- Kawabata, T.
- Kimura, H.
- Kondo, Y.
- Kurita, K.
- Kurokawa, M.
- Moriguchi, T.
- Murakami, H.
- Ooishi, H.
- Okada, K.
- Ota, S.
- Ozawa, A.
- Sakurai, H.
- Shimoura, S.
- Shioda, R.
- Takeshita, E.
- Takeuchi, S.
- Tian, W.D.
- Wang, H.W.
- Wang, J.S.
- Wang, M.
- Yamada, K.
- Yamada, Y.
- Yasuda, Y.
- Yoneda, K.
- Zhang, G.Q.
- Motobayashi, T.
Publication date
April 2015
DOI Publisher
The Authors. Published by Elsevier B.V.Abstract
AbstractTwo-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
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