Elsevier

Nuclear Physics A

Volume 379, Issue 1, 26 April 1982, Pages 160-172
Nuclear Physics A

Energy and angular momentum transfers in equilibrium and pre-equilibrium 158Gd(α, xn) reactions

https://doi.org/10.1016/0375-9474(82)90561-9Get rights and content

Abstract

Neutron time-of-flight spectra and γ-ray multiplicities were measured in coincidence with discrete γ-rays for specific exit channels in the 158Gd(α, xn) reactions at Eα = 70 MeV. The neutron energy spectra and angular distributions were analysed in terms of equilibrium and non-equilibrium decay processes. Significant emission of non-equilibrated neutrons was found, amounting to about 40 %, 25 % and 15 % of the total neutron emission in the 4n, 5n and 6n exit channels, respectively. The corresponding average kinetic energies in this precompound phase were around 12, 8 and 4.5 MeV. The angular momentum carried away by the neutrons was found to be rather constant for all exit channels and on the average about 3ħ units. It is found that the total energy and angular momentum removed by the neutrons and γ-rays agrees within the experimental errors with the calculated values for the compound nucleus.

References (21)

  • H. Ejiri et al.

    Nucl. Phys.

    (1978)
  • Y. Nagai et al.

    J. Phys. Soc. Japan

    (1979)
  • D.G. Sarantites et al.

    Phys. Rev.

    (1978)
  • H. Sakai et al.

    Phys. Rev.

    (1979)
  • H. Ejiri et al.

    J. Phys. Soc. Japan

    (1980)
    H. Sakai et al.

    Phys. Rev.

    (1980)
  • G. Baur et al.

    Phys. Rev.

    (1980)
  • H. Ejiri et al.

    J. Phys. Soc. Japan

    (1978)
  • L. Westerberg et al.

    Phys. Rev.

    (1978)
  • M. Ogawa et al.

    Z. Phys.

    (1978)
  • W.J. Ockels et al.

    Phys. Lett.

    (1978)
There are more references available in the full text version of this article.

Cited by (10)

  • Puzzle of collective enhancement in the nuclear level density

    2021, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
View all citing articles on Scopus

Present address: Faculty of General Education, Tokohu University, Sendai, Japan.

View full text