Measurement of neutron multiplicity from fission of {sup 228}U and nuclear dissipation

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.064615· OSTI ID:21296606

Singh, Hardev; Behera, B R; Singh, Gulzar; Govil, I M; Golda, K S; Jhingan, Akhil; Singh, R P; Sugathan, P; Chatterjee, M B; Datta, S K; Pal, Santanu; Ranjeet,; Mandal, S; Shidling, P D; Viesti, G ^[1]

---

1. Department of Physics, Panjab University, Chandigarh 160014 (India)

Pre- and post-scission neutron multiplicities are measured at different excitation energies of the compound nucleus {sup 228}U populated using the {sup 19}F+{sup 209}Bi reaction. The measured yield of pre-scission and total neutrons are compared with the statistical model calculation for the decay of a compound nucleus. The statistical model calculations are performed using the Bohr-Wheeler transition state fission width as well as the dissipative dynamical fission width due to Kramers. Comparison between the measured and the calculated values shows that, while the Bohr-Wheeler fission width grossly underestimates the pre-scission neutron yield, a large amount of dissipation is required in the Kramers width to fit the experimental pre-scission multiplicities. Various factors contributing to the large excitation energy dependence of the fitted values of the dissipation coefficient are discussed.

• OSTI ID: 21296606
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 80, Issue 6; Other Information: DOI: 10.1103/PhysRevC.80.064615; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BISMUTH 209
COMPARATIVE EVALUATIONS
COMPOUND NUCLEI
DECAY
ENERGY DEPENDENCE
EXCITATION
FISSION
FLUORINE 19
MULTIPLICITY
NEUTRONS
STATISTICAL MODELS
URANIUM 228