Pauli-blocking effects in neutron-alpha reactions
- Institutul de Fizica si Inginerie Nucleara, Bucharest (Romania)
- Inst. of Nuclear Research and Nuclear Energy, Sofia (Bulgaria)
- Lawrence Livermore National Lab., CA (United States)
- Oxford Univ. (United Kingdom)
We present a knockout model for direct (n,{alpha}) reactions in which the residual nucleus is left in a continuum excited state. The interaction of the neutron with a preformed alpha particle inside the nucleus is related to the free neutron-alpha scattering cross-section, with modifications to account for nuclear medium effects, including Fermi motion, Pauli-blocking, and barrier penetration. Phase space restrictions for the four nucleons of the alpha-particle after the knockout are imposed by a Pauli-blocking function. We apply this model, along with evaporation contributions, to analyze excitation functions of (n,{alpha} reactions on {sup 48}Ti, {sup 51}V, {sup 52}Cr, {sup 54}Fe, {sup 55}Mn, and {sup 59}Co. Good agreement is obtained between our calculations and experimental measurements. Values for the local Fermi energy in the region from where knockout occurs indicate a surface reaction.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10173578
- Report Number(s):
- UCRL-JC-117463; CONF-940507-36; ON: DE94016358; TRN: 94:016637
- Resource Relation:
- Conference: International conference on nuclear data for science and technology: nuclear data for the twenty-first century,Gatlinburg, TN (United States),9-13 May 1994; Other Information: PBD: 1 Jun 1994
- Country of Publication:
- United States
- Language:
- English
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NEUTRON REACTIONS
EXCITATION FUNCTIONS
ALPHA PARTICLES
NUCLEON-NUCLEON INTERACTIONS
IRON 54 TARGET
VANADIUM 51 TARGET
COBALT 59 TARGET
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NUCLEON-INDUCED REACTIONS AND SCATTERING
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