Electric quadrupole moment of 17B and anomalous E2 effective charges for neutron-rich nuclei

H. Ogawa, K. Asahi, K. Sakai, T. Suzuki, H. Izumi, H. Miyoshi, M. Nagakura, K. Yogo, A. Goto, T. Suga, T. Honda, H. Ueno, Y. X. Watanabe, K. Yoneda, Akihiro Yoshimi, N. Fukuda, Y. Kobayashi, A. Yoshida, T. Kubo, M. IshiharaN. Imai, N. Aoi, W. D. Schmidt-Ott, G. Neyens, S. Teughels

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Abstract

The electric quadrupole moment Q for the ground state of 17B was determined by the β-NMR method applied to spin-polarized projectile fragments. From the measured quadrupole coupling constant, |eqQ/h(17 in Mg)| = 137.4±4.5 kHz, for 17B in a Mg single crystal stopper the Q moment was deduced as |Q(17B)| = 38.6±1.5 mb. As was the case in the previous 15B result, the obtained Q moment is very close to that for the N = 8 isotope 13B, in sharp contrast to the results of conventional shell-model calculations using constant effective charges. Comparison of the shell-model calculations indicates substantial reduction of the E2 effective charges for isotopes with large (N-Z)/A ratios. The results were well accounted for in terms of (N-Z)/A dependent E2 polarization charges as predicted by Bohr and Mottelson and by incorporating the decoupling feature of loosely bound particles.

Original languageEnglish
Pages (from-to)643081-643089
Number of pages9
JournalPhysical Review C - Nuclear Physics
Volume67
Issue number6
Publication statusPublished - Jun 2003
Externally publishedYes

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quadrupoles
moments
neutrons
nuclei
isotopes
decoupling
projectiles
fragments
nuclear magnetic resonance
ground state
single crystals
polarization

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

Ogawa, H., Asahi, K., Sakai, K., Suzuki, T., Izumi, H., Miyoshi, H., ... Teughels, S. (2003). Electric quadrupole moment of 17B and anomalous E2 effective charges for neutron-rich nuclei. Physical Review C - Nuclear Physics, 67(6), 643081-643089.

Electric quadrupole moment of 17B and anomalous E2 effective charges for neutron-rich nuclei. / Ogawa, H.; Asahi, K.; Sakai, K.; Suzuki, T.; Izumi, H.; Miyoshi, H.; Nagakura, M.; Yogo, K.; Goto, A.; Suga, T.; Honda, T.; Ueno, H.; Watanabe, Y. X.; Yoneda, K.; Yoshimi, Akihiro; Fukuda, N.; Kobayashi, Y.; Yoshida, A.; Kubo, T.; Ishihara, M.; Imai, N.; Aoi, N.; Schmidt-Ott, W. D.; Neyens, G.; Teughels, S.

In: Physical Review C - Nuclear Physics, Vol. 67, No. 6, 06.2003, p. 643081-643089.

Research output: Contribution to journalArticle

Ogawa, H, Asahi, K, Sakai, K, Suzuki, T, Izumi, H, Miyoshi, H, Nagakura, M, Yogo, K, Goto, A, Suga, T, Honda, T, Ueno, H, Watanabe, YX, Yoneda, K, Yoshimi, A, Fukuda, N, Kobayashi, Y, Yoshida, A, Kubo, T, Ishihara, M, Imai, N, Aoi, N, Schmidt-Ott, WD, Neyens, G & Teughels, S 2003, 'Electric quadrupole moment of 17B and anomalous E2 effective charges for neutron-rich nuclei', Physical Review C - Nuclear Physics, vol. 67, no. 6, pp. 643081-643089.
Ogawa H, Asahi K, Sakai K, Suzuki T, Izumi H, Miyoshi H et al. Electric quadrupole moment of 17B and anomalous E2 effective charges for neutron-rich nuclei. Physical Review C - Nuclear Physics. 2003 Jun;67(6):643081-643089.
Ogawa, H. ; Asahi, K. ; Sakai, K. ; Suzuki, T. ; Izumi, H. ; Miyoshi, H. ; Nagakura, M. ; Yogo, K. ; Goto, A. ; Suga, T. ; Honda, T. ; Ueno, H. ; Watanabe, Y. X. ; Yoneda, K. ; Yoshimi, Akihiro ; Fukuda, N. ; Kobayashi, Y. ; Yoshida, A. ; Kubo, T. ; Ishihara, M. ; Imai, N. ; Aoi, N. ; Schmidt-Ott, W. D. ; Neyens, G. ; Teughels, S. / Electric quadrupole moment of 17B and anomalous E2 effective charges for neutron-rich nuclei. In: Physical Review C - Nuclear Physics. 2003 ; Vol. 67, No. 6. pp. 643081-643089.
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abstract = "The electric quadrupole moment Q for the ground state of 17B was determined by the β-NMR method applied to spin-polarized projectile fragments. From the measured quadrupole coupling constant, |eqQ/h(17 in Mg)| = 137.4±4.5 kHz, for 17B in a Mg single crystal stopper the Q moment was deduced as |Q(17B)| = 38.6±1.5 mb. As was the case in the previous 15B result, the obtained Q moment is very close to that for the N = 8 isotope 13B, in sharp contrast to the results of conventional shell-model calculations using constant effective charges. Comparison of the shell-model calculations indicates substantial reduction of the E2 effective charges for isotopes with large (N-Z)/A ratios. The results were well accounted for in terms of (N-Z)/A dependent E2 polarization charges as predicted by Bohr and Mottelson and by incorporating the decoupling feature of loosely bound particles.",
author = "H. Ogawa and K. Asahi and K. Sakai and T. Suzuki and H. Izumi and H. Miyoshi and M. Nagakura and K. Yogo and A. Goto and T. Suga and T. Honda and H. Ueno and Watanabe, {Y. X.} and K. Yoneda and Akihiro Yoshimi and N. Fukuda and Y. Kobayashi and A. Yoshida and T. Kubo and M. Ishihara and N. Imai and N. Aoi and Schmidt-Ott, {W. D.} and G. Neyens and S. Teughels",
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AU - Ogawa, H.

AU - Asahi, K.

AU - Sakai, K.

AU - Suzuki, T.

AU - Izumi, H.

AU - Miyoshi, H.

AU - Nagakura, M.

AU - Yogo, K.

AU - Goto, A.

AU - Suga, T.

AU - Honda, T.

AU - Ueno, H.

AU - Watanabe, Y. X.

AU - Yoneda, K.

AU - Yoshimi, Akihiro

AU - Fukuda, N.

AU - Kobayashi, Y.

AU - Yoshida, A.

AU - Kubo, T.

AU - Ishihara, M.

AU - Imai, N.

AU - Aoi, N.

AU - Schmidt-Ott, W. D.

AU - Neyens, G.

AU - Teughels, S.

PY - 2003/6

Y1 - 2003/6

N2 - The electric quadrupole moment Q for the ground state of 17B was determined by the β-NMR method applied to spin-polarized projectile fragments. From the measured quadrupole coupling constant, |eqQ/h(17 in Mg)| = 137.4±4.5 kHz, for 17B in a Mg single crystal stopper the Q moment was deduced as |Q(17B)| = 38.6±1.5 mb. As was the case in the previous 15B result, the obtained Q moment is very close to that for the N = 8 isotope 13B, in sharp contrast to the results of conventional shell-model calculations using constant effective charges. Comparison of the shell-model calculations indicates substantial reduction of the E2 effective charges for isotopes with large (N-Z)/A ratios. The results were well accounted for in terms of (N-Z)/A dependent E2 polarization charges as predicted by Bohr and Mottelson and by incorporating the decoupling feature of loosely bound particles.

AB - The electric quadrupole moment Q for the ground state of 17B was determined by the β-NMR method applied to spin-polarized projectile fragments. From the measured quadrupole coupling constant, |eqQ/h(17 in Mg)| = 137.4±4.5 kHz, for 17B in a Mg single crystal stopper the Q moment was deduced as |Q(17B)| = 38.6±1.5 mb. As was the case in the previous 15B result, the obtained Q moment is very close to that for the N = 8 isotope 13B, in sharp contrast to the results of conventional shell-model calculations using constant effective charges. Comparison of the shell-model calculations indicates substantial reduction of the E2 effective charges for isotopes with large (N-Z)/A ratios. The results were well accounted for in terms of (N-Z)/A dependent E2 polarization charges as predicted by Bohr and Mottelson and by incorporating the decoupling feature of loosely bound particles.

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