Application of Doppler-shift attenuation method to the de-excitation γ rays from the in-flight 12Be beam

N. Imai, N. Aoi, H. J. Ong, H. Sakurai, K. Demichi, H. Kawasaki, H. Baba, Zs Dombrádi, Z. Elekes, N. Fukuda, Zs Fülöp, A. Gelberg, T. Gomi, H. Hasegawa, K. Ishikawa, M. Ishihara, H. Iwasaki, E. Kaneko, S. Kanno, T. KishidaY. Kondo, T. Kubo, K. Kurita, S. Michimasa, T. Minemura, M. Miura, T. Motobayashi, T. Nakamura, M. Notani, T. K. Ohnishi, A. Saito, S. Shimoura, T. Sugimoto, M. K. Suzuki, E. Takeshita, S. Takeuchi, M. Tamaki, H. Watanabe, K. Yoneda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The B(E2;↓) value of the neutron-rich nucleus 12Be has been determined through the measurement of the lifetime of the first 2+ state using a modified Doppler-shift attenuation method (DSAM). The first excited state was produced by the inelastic scattering of the intermediate energy 12Be beam off a thick gold target, which played two roles, to excite the beam and to decrease the velocity. The lifetime has been determined to be 2.5±0.7 (stat) ± 0.3 (syst) ps, which gives a B(E2) value of 5.0±1.3±0.5 in Weisskopf units. The result shows a large quadrupole strength in the ground state transition. The B(E2) value together with the deformation length measured by proton inelastic scattering yields a neutron quadrupole matrix element two times larger than those for 14C and 16O.

Original languageEnglish
Title of host publicationPerspectives in Nuclear Physics - Proceedings of the 6th Japan-Italy Symposium on Heavy-Ion Physics
Pages265-269
Number of pages5
DOIs
Publication statusPublished - 2009
Event6th Japan-Italy Symposium on Heavy-Ion Physics - Tokai, Japan
Duration: Nov 11 2008Nov 15 2008

Publication series

NameAIP Conference Proceedings
Volume1120
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other6th Japan-Italy Symposium on Heavy-Ion Physics
CountryJapan
CityTokai
Period11/11/0811/15/08

Keywords

  • Doppler-shift attenuation method
  • Radioactive beam experiment
  • Reduced matrix element

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Imai, N., Aoi, N., Ong, H. J., Sakurai, H., Demichi, K., Kawasaki, H., Baba, H., Dombrádi, Z., Elekes, Z., Fukuda, N., Fülöp, Z., Gelberg, A., Gomi, T., Hasegawa, H., Ishikawa, K., Ishihara, M., Iwasaki, H., Kaneko, E., Kanno, S., ... Yoneda, K. (2009). Application of Doppler-shift attenuation method to the de-excitation γ rays from the in-flight 12Be beam. In Perspectives in Nuclear Physics - Proceedings of the 6th Japan-Italy Symposium on Heavy-Ion Physics (pp. 265-269). (AIP Conference Proceedings; Vol. 1120). https://doi.org/10.1063/1.3141658