Properties of neutron emission in fission processes induced by Ne20+Tb159 and Ne20+Tm169 reactions between E=8 and 16MeVnucleon

Th. Keutgen, J. Cabrera, Y. El Masri, Ch. Dufauquez, V. Roberfroid, I. Tilquin, A. Ninane, J. Van Mol, R. Régimbart, R. J. Charity, J. B. Natowitz, K. Hagel, R. Wada, and D. J. Hinde
Phys. Rev. C 70, 014611 – Published 29 July 2004

Abstract

Neutron emission in E=8, 10, 13, and 16MeVnucleon Ne20+Tb159, Tm169 induced fission reactions has been further studied. The 4π configuration of the DEMON neutron multidetector allowed a detailed investigation of the pre- and postscission properties as functions of the fission parameters. The emission of the neutrons from their respective sources was found to be isotropic to a high degree. The determination of the compound-nucleus recoil velocity and the kinetic-energy release in fission suffers from smearing due to the recoil kicks imparted by the evaporated pre- and postscission light particles. Attempts to gate on these quantities lead to biases in the emission patterns of the evaporated neutrons. Specifically, with such gates, the assumption of isotropic emission is violated and attempts to analyze such gated neutron spectra with the standard fitting technique, which assumes isotropy, lead to spurious results. All these effects are clearly illustrated in this work.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
7 More
  • Received 2 October 2003

DOI:https://doi.org/10.1103/PhysRevC.70.014611

©2004 American Physical Society

Authors & Affiliations

Th. Keutgen, J. Cabrera, Y. El Masri, Ch. Dufauquez, V. Roberfroid, I. Tilquin, A. Ninane, and J. Van Mol

  • FNRS and Institute of Nuclear Physics, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium

R. Régimbart

  • Laboratoire de Physique Corpusculaire, IN2P3, CNRS/ISMRA, F-14050 Caen Cedex, France

R. J. Charity

  • Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA

J. B. Natowitz, K. Hagel, and R. Wada

  • Cyclotron Institute, Texas A&M University, College Station, Texas 77845, USA

D. J. Hinde

  • Department of Nuclear Physics, The Australian National University, Canberra, Australia

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 70, Iss. 1 — July 2004

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×