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arXiv · 0709.1081

Examining exotic structure of proton-rich nucleus $^{23}$Al

D. Q. Fang·W. Guo·C. W. Ma·K. Wang·T. Z. Yan·Y. G. Ma·X. Z. Cai·W. Q. Shen·Z. Z. Ren·Z. Y. Sun·J. G. Chen·W. D. Tian·C. Zhong·M. Hosoi·T. Izumikawa·R. Kanungo·S. Nakajima·T. Ohnishi·T. Ohtsubo·A. Ozawa·T. Suda·K. Sugawara·T. Suzuki·A. Takisawa·K. Tanaka·T. Yamaguchi·I. Tanihata
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Abstract

The longitudinal momentum distribution (P_{//}) of fragments after one-proton removal from ^{23} Al and reaction cross sections (σ_R) for ^{23,24} Al on carbon target at 74A MeV have been measured. The ^{23,24} Al ions were produced through projectile fragmentation of 135 A MeV ^{28} Si primary beam using RIPS fragment separator at RIKEN. P_{//} is measured by a direct time-of-flight (TOF) technique, while σ_R is determined using a transmission method. An enhancement in σ_R is observed for ^{23} Al compared with ^{24} Al. The P_{//} for ^{22} Mg fragments from ^{23} Al breakup has been obtained for the first time. FWHM of the distributions has been determined to be 232 \pm 28 MeV/c. The experimental data are discussed by using Few-Body Glauber model. Analysis of P_{//} demonstrates a dominant d-wave configuration for the valence proton in ground state of ^{23} Al, indicating that ^{23} Al is not a proton halo nucleus.

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D. Q. Fang, W. Guo, C. W. Ma, K. Wang, T. Z. Yan, Y. G. Ma, X. Z. Cai, W. Q. Shen, Z. Z. Ren, Z. Y. Sun, J. G. Chen, W. D. Tian, C. Zhong, M. Hosoi, T. Izumikawa, R. Kanungo, S. Nakajima, T. Ohnishi, T. Ohtsubo, A. Ozawa, T. Suda, K. Sugawara, T. Suzuki, A. Takisawa, K. Tanaka, T. Yamaguchi, I. Tanihata. 2007-09-07. Examining exotic structure of proton-rich nucleus $^{23}$Al. https://doi.org/10.1103/physrevc.76.031601

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