Physics Letters B (Apr 2015)
Different mechanism of two-proton emission from proton-rich nuclei 23Al and 22Mg
- 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
Affiliations
- Y.G. Ma
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- D.Q. Fang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- X.Y. Sun
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- P. Zhou
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- Y. Togano
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
- N. Aoi
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
- H. Baba
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
- X.Z. Cai
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- X.G. Cao
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- J.G. Chen
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- Y. Fu
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- W. Guo
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- Y. Hara
- Department of Physics, Rikkyo University, Tokyo 171-8501, Japan
- T. Honda
- Department of Physics, Rikkyo University, Tokyo 171-8501, Japan
- Z.G. Hu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- K. Ieki
- Department of Physics, Rikkyo University, Tokyo 171-8501, Japan
- Y. Ishibashi
- Institute of Physics, University of Tsukuba, Ibaraki 305-8571, Japan
- Y. Ito
- Institute of Physics, University of Tsukuba, Ibaraki 305-8571, Japan
- N. Iwasa
- Department of Physics, Tohoku University, Miyagi 980-8578, Japan
- S. Kanno
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
- T. Kawabata
- Center for Nuclear Study (CNS), University of Tokyo, Saitama 351-0198, Japan
- H. Kimura
- Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
- Y. Kondo
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
- K. Kurita
- Department of Physics, Rikkyo University, Tokyo 171-8501, Japan
- M. Kurokawa
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
- T. Moriguchi
- Institute of Physics, University of Tsukuba, Ibaraki 305-8571, Japan
- H. Murakami
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
- H. Ooishi
- Institute of Physics, University of Tsukuba, Ibaraki 305-8571, Japan
- K. Okada
- Department of Physics, Rikkyo University, Tokyo 171-8501, Japan
- S. Ota
- Center for Nuclear Study (CNS), University of Tokyo, Saitama 351-0198, Japan
- A. Ozawa
- Institute of Physics, University of Tsukuba, Ibaraki 305-8571, Japan
- H. Sakurai
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
- S. Shimoura
- Center for Nuclear Study (CNS), University of Tokyo, Saitama 351-0198, Japan
- R. Shioda
- Department of Physics, Rikkyo University, Tokyo 171-8501, Japan
- E. Takeshita
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
- S. Takeuchi
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
- W.D. Tian
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- H.W. Wang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- J.S. Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- M. Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- K. Yamada
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
- Y. Yamada
- Department of Physics, Rikkyo University, Tokyo 171-8501, Japan
- Y. Yasuda
- Institute of Physics, University of Tsukuba, Ibaraki 305-8571, Japan
- K. Yoneda
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
- G.Q. Zhang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- T. Motobayashi
- Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
- Journal volume & issue
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Vol. 743
pp. 306 – 309
Abstract
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.
