Elsevier

Physics Letters B

Volume 491, Issues 1–2, 12 October 2000, Pages 8-14
Physics Letters B

Low-lying intruder 1 state in 12Be and the melting of the N=8 shell closure

https://doi.org/10.1016/S0370-2693(00)01017-0Get rights and content

Abstract

Inelastic scattering of the neutron-rich nucleus 12Be on lead and carbon targets has been studied by measuring de-excitation γ rays in coincidence with scattered 12Be. The strong γ-ray transition from the state at Ex=2.68(3) MeV following E1 Coulomb excitation was observed for the lead target, leading to an assignment of Jπ=1 for the excited state. The low excitation energy of this intruder 1 state and the deduced large B(E1;0g.s.+→1) value of 0.051(13)e2 fm2 provide a consistent picture of the N=8 shell melting in 12Be.

Section snippets

Acknowledgements

Sincere gratitude is extended to the staff members of the RIKEN Ring Cyclotron for their operation of the accelerator during the experiment. The present work is supported in part by the Ministry of Education, Science, Sports and Culture by Grant-In-Aid for Scientific Research under the program number (B) 08454069.

References (32)

  • M. Zinser

    Nucl. Phys. A

    (1997)
  • T. Nakamura

    Phys. Lett. B

    (1994)
  • Toshio Suzuki et al.

    Phys. Rev. C

    (1997)
  • A. Navin

    Phys. Rev. Lett.

    (2000)
  • R. Anne

    Z. Phys. A

    (1995)
  • J. Raynal, Coupled channel code ECIS79,...
  • M. Bernas et al.

    Phys. Lett. B

    (1982)
  • H.T. Fortune et al.

    Phys. Rev. C

    (1994)
  • M. Zahar

    Phys. Rev. C

    (1994)
  • P.M. Endt

    At. Data Nucl. Data Tables

    (1979)
  • M. Frauerbach

    Phys. Rev. C

    (1997)
  • C.A. Bertulani

    Phys. Rev. C

    (1994)
  • N. Vinh Mau et al.

    Nucl. Phys. A

    (1996)
  • D.J. Millener

    Phys. Rev. C

    (1983)
  • K. Ieki

    Phys. Rev. Lett.

    (1993)
    D. Sackett

    Phys. Rev. C

    (1993)
  • S. Shimoura

    Phys. Lett. B

    (1995)
  • Cited by (0)

    1

    On leave from ATOMKI, Debrecen, Hungary.

    2

    Present address: Department of Science Education, Ewha Woman's University, Seoul 120-750, Korea.

    View full text