β Decay of the proton-rich nucleus Si24 and its mirror asymmetry

Y. Ichikawa, T. K. Onishi, D. Suzuki, H. Iwasaki, T. Kubo, V. Naik, A. Chakrabarti, N. Aoi, B. A. Brown, N. Fukuda, S. Kubono, T. Motobayashi, T. Nakabayashi, T. Nakamura, T. Nakao, T. Okumura, H. J. Ong, H. Suzuki, M. K. Suzuki, T. TeranishiK. N. Yamada, H. Yamaguchi, H. Sakurai

研究成果: ジャーナルへの寄稿記事

15 引用 (Scopus)

抄録

β-decay spectroscopy of the proton-rich nucleus Si24 was performed. The decay scheme was reconstructed from results of delayed γ-ray and proton measurements. We observed two β branches to bound states in Al24 for the first time. The branching ratios were determined to be 31(4)% and 23.9(15)% for the 11+ state at 0.426 MeV and the state at 1.090 MeV, respectively. The observation of an allowed transition to the 1.090-MeV state enabled us to firmly determine its spin-parity as 1+. In the proton measurements performed with the ΔE-E method, we observed a new unbound level at 6.735 MeV. The branching ratios to three unbound states, including the new level, were also determined for the first time. Based on the decay scheme, the B(GT) values of Si24 were deduced. The B(GT) values were smaller than those of the mirror nucleus Ne24 by 22% and 10% for the 11+ and 12+ states, respectively. The mirror asymmetries of B(GT), observed in both the 11+ and the 12+ states, indicate changes in configuration in the wave function associated with the Thomas-Ehrman shift. To clarify the mechanism of this asymmetry, a comparison with shell-model calculations is also discussed. The calculations attribute the changes in configuration to the lowering of the 1s1/2 orbital.

元の言語英語
記事番号044302
ジャーナルPhysical Review C - Nuclear Physics
80
発行部数4
DOI
出版物ステータス出版済み - 10 5 2009

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asymmetry
mirrors
nuclei
protons
decay
configurations
rays
parity
wave functions
orbitals
shift
spectroscopy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

これを引用

Ichikawa, Y., Onishi, T. K., Suzuki, D., Iwasaki, H., Kubo, T., Naik, V., ... Sakurai, H. (2009). β Decay of the proton-rich nucleus Si24 and its mirror asymmetry. Physical Review C - Nuclear Physics, 80(4), [044302]. https://doi.org/10.1103/PhysRevC.80.044302

β Decay of the proton-rich nucleus Si24 and its mirror asymmetry. / Ichikawa, Y.; Onishi, T. K.; Suzuki, D.; Iwasaki, H.; Kubo, T.; Naik, V.; Chakrabarti, A.; Aoi, N.; Brown, B. A.; Fukuda, N.; Kubono, S.; Motobayashi, T.; Nakabayashi, T.; Nakamura, T.; Nakao, T.; Okumura, T.; Ong, H. J.; Suzuki, H.; Suzuki, M. K.; Teranishi, T.; Yamada, K. N.; Yamaguchi, H.; Sakurai, H.

:: Physical Review C - Nuclear Physics, 巻 80, 番号 4, 044302, 05.10.2009.

研究成果: ジャーナルへの寄稿記事

Ichikawa, Y, Onishi, TK, Suzuki, D, Iwasaki, H, Kubo, T, Naik, V, Chakrabarti, A, Aoi, N, Brown, BA, Fukuda, N, Kubono, S, Motobayashi, T, Nakabayashi, T, Nakamura, T, Nakao, T, Okumura, T, Ong, HJ, Suzuki, H, Suzuki, MK, Teranishi, T, Yamada, KN, Yamaguchi, H & Sakurai, H 2009, 'β Decay of the proton-rich nucleus Si24 and its mirror asymmetry', Physical Review C - Nuclear Physics, 巻. 80, 番号 4, 044302. https://doi.org/10.1103/PhysRevC.80.044302
Ichikawa Y, Onishi TK, Suzuki D, Iwasaki H, Kubo T, Naik V その他. β Decay of the proton-rich nucleus Si24 and its mirror asymmetry. Physical Review C - Nuclear Physics. 2009 10 5;80(4). 044302. https://doi.org/10.1103/PhysRevC.80.044302
Ichikawa, Y. ; Onishi, T. K. ; Suzuki, D. ; Iwasaki, H. ; Kubo, T. ; Naik, V. ; Chakrabarti, A. ; Aoi, N. ; Brown, B. A. ; Fukuda, N. ; Kubono, S. ; Motobayashi, T. ; Nakabayashi, T. ; Nakamura, T. ; Nakao, T. ; Okumura, T. ; Ong, H. J. ; Suzuki, H. ; Suzuki, M. K. ; Teranishi, T. ; Yamada, K. N. ; Yamaguchi, H. ; Sakurai, H. / β Decay of the proton-rich nucleus Si24 and its mirror asymmetry. :: Physical Review C - Nuclear Physics. 2009 ; 巻 80, 番号 4.
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abstract = "β-decay spectroscopy of the proton-rich nucleus Si24 was performed. The decay scheme was reconstructed from results of delayed γ-ray and proton measurements. We observed two β branches to bound states in Al24 for the first time. The branching ratios were determined to be 31(4){\%} and 23.9(15){\%} for the 11+ state at 0.426 MeV and the state at 1.090 MeV, respectively. The observation of an allowed transition to the 1.090-MeV state enabled us to firmly determine its spin-parity as 1+. In the proton measurements performed with the ΔE-E method, we observed a new unbound level at 6.735 MeV. The branching ratios to three unbound states, including the new level, were also determined for the first time. Based on the decay scheme, the B(GT) values of Si24 were deduced. The B(GT) values were smaller than those of the mirror nucleus Ne24 by 22{\%} and 10{\%} for the 11+ and 12+ states, respectively. The mirror asymmetries of B(GT), observed in both the 11+ and the 12+ states, indicate changes in configuration in the wave function associated with the Thomas-Ehrman shift. To clarify the mechanism of this asymmetry, a comparison with shell-model calculations is also discussed. The calculations attribute the changes in configuration to the lowering of the 1s1/2 orbital.",
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AU - Ichikawa, Y.

AU - Onishi, T. K.

AU - Suzuki, D.

AU - Iwasaki, H.

AU - Kubo, T.

AU - Naik, V.

AU - Chakrabarti, A.

AU - Aoi, N.

AU - Brown, B. A.

AU - Fukuda, N.

AU - Kubono, S.

AU - Motobayashi, T.

AU - Nakabayashi, T.

AU - Nakamura, T.

AU - Nakao, T.

AU - Okumura, T.

AU - Ong, H. J.

AU - Suzuki, H.

AU - Suzuki, M. K.

AU - Teranishi, T.

AU - Yamada, K. N.

AU - Yamaguchi, H.

AU - Sakurai, H.

PY - 2009/10/5

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N2 - β-decay spectroscopy of the proton-rich nucleus Si24 was performed. The decay scheme was reconstructed from results of delayed γ-ray and proton measurements. We observed two β branches to bound states in Al24 for the first time. The branching ratios were determined to be 31(4)% and 23.9(15)% for the 11+ state at 0.426 MeV and the state at 1.090 MeV, respectively. The observation of an allowed transition to the 1.090-MeV state enabled us to firmly determine its spin-parity as 1+. In the proton measurements performed with the ΔE-E method, we observed a new unbound level at 6.735 MeV. The branching ratios to three unbound states, including the new level, were also determined for the first time. Based on the decay scheme, the B(GT) values of Si24 were deduced. The B(GT) values were smaller than those of the mirror nucleus Ne24 by 22% and 10% for the 11+ and 12+ states, respectively. The mirror asymmetries of B(GT), observed in both the 11+ and the 12+ states, indicate changes in configuration in the wave function associated with the Thomas-Ehrman shift. To clarify the mechanism of this asymmetry, a comparison with shell-model calculations is also discussed. The calculations attribute the changes in configuration to the lowering of the 1s1/2 orbital.

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