Existence of a proton halo in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>23</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Al</mml:mi></mml:math>and its significance

Cai, X. Z.; Zhang, H. Y.; Shen, Wen; Ren, Zhongzhou; Feng, J.; Fang, Deqing; Zhang, Zhu; Jiang, Wei-Zhou; Ma, Yugang; Chen, Zhong; Wang, Zhan; Guo, Zhimou; Xiao, Guoqing; Wang, J. S.; Zhu, Yuhao; Li, Jiaxing; Wang, M.; Ning, Zengping; Wang, Q. J.; Chen, Z. Q.

doi:10.1103/physrevc.65.024610

Cited by 70 publications

(34 citation statements)

References 37 publications

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“…The proton-rich nuclei 23 Al and 22 Mg are very important in determining some astrophysical reaction rates and have attracted a lot of attention in both astrophysics and nuclear structure studies [22][23][24][25][26][27][28][29]. Recently, we have reported the experimental results for kinematically complete measurements of two-proton emissions from two excited proton-rich nuclei, namely, 23 Al → p + p + 21 Na and 22 Mg → p + p + 20 Ne [30].…”

Section: Introductionmentioning

confidence: 99%

Proton-proton correlations in distinguishing the two-proton emission mechanism of Al23 and Mg22

Fang¹,

G.²,

Sun³

et al. 2016

Phys. Rev. C

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The proton-proton momentum correlation functions [C pp (q) Al and 22 Mg, the source size and emission time information were extracted from the C pp (q) data by assuming a Gaussian source profile in the correlation function calculation code (CRAB). The results indicated that the mechanism of two-proton emission from 23 Al was mainly sequential emission, while that of 22 Mg was mainly three-body simultaneous emission. By combining our earlier results of the two-proton relative momentum and the opening angle, it is pointed out that the mechanism of two-proton emission could be distinguished clearly.

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Section: Introductionmentioning

confidence: 99%

Proton-proton correlations in distinguishing the two-proton emission mechanism of Al23 and Mg22

Fang¹,

G.²,

Sun³

et al. 2016

Phys. Rev. C

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“…The proton-rich nucleus 23 Al has also attracted a lot of attention in recent years since it may play a crucial role in understanding the depletion of the NeNa cycle in ONe novae [19][20][21]. The measurement of its reaction cross section and fragment momentum distribution has shown that the valence proton in 23 Al is dominated by the d wave but with an enlarged core [22,23]. The spin and parity of the 23 Al ground state was found to be J π = 5/2 + [19,24].…”

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confidence: 99%

“…The spin and parity of the 23 Al ground state was found to be J π = 5/2 + [19,24]. Also of great interest is 22 Mg because of its importance in determining the astrophysical reaction rates for 21 Na(p,γ) 22 Mg and 18 Ne(α,p) 21 Na reactions in the explosive stellar scenarios [25,26].…”

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confidence: 99%

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confidence: 99%

“…In this Letter, we present an exclusive measurement to select the three-body decay channels of 23 Al and 22 Mg, and investigate the relative momentum and opening angle between the two protons. Based on the previous studies, a specific excitation energy window of 10.5 < E * < 15 MeV is used for 23 Al and while 12.5 < E * < 18 MeV for 22 Mg, respectively. The window selections are based on (1) the data table of 23 Al shows the existence of an excited state of 11.780 MeV where two-proton emission may exist [27]; (2) the transitions from the 22 Mg (T =2) analog state (the excitation energy is 14.044 MeV) to the ground state and/or first excited state of 20 Ne was claimed but they were unable to distinguish diproton emission or sequential protons emission [28].…”

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Different mechanism of two-proton emission from proton-rich nuclei 23Al and 22Mg

Fang

Sun

et al. 2015

Physics Letters B

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Two-proton relative momentum (q pp ) and opening angle (θ pp ) distributions from the three-body decay of two excited proton-rich nuclei, namely 23 Al → p + p + 21 Na and 22 Mg → p + p + 20 Ne, have been measured with the projectile fragment separator (RIPS) at the RIKEN RI Beam Factory. An evident peak at q pp ∼ 20 MeV/c as well as a peak in θ pp around 30 • are seen in the two-proton break-up channel from a highly-excited 22 Mg. In contrast, such peaks are absent for the 23 Al case. It is concluded that the two-proton emission mechanism of excited 22 Mg is quite different from the 23 Al 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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