Neutron Radiative Capture

Neutron Radiative Capture

Neutron Physics and Nuclear Data in Science and Technology

1st Edition - January 1, 1984

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  • Authors: B. J. Allen, I. Bergqvist, R. E. Chrien
  • eBook ISBN: 9781483152431

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Neutron Physics and Nuclear Data in Science and Technology, Volume 3: Neutron Radiative Capture discusses topics that help bridge the gap between experimental and theoretical scientists and applications scientists and engineers. The first chapter discusses the theory of slow neutron radiative capture, while the second chapter covers fast neutron radiative capture. Chapter III talks about methods for calculating neutron capture cross sections and gamma-ray spectra, while Chapter IV deals with the measurement techniques for radiative neutron capture, and Chapter V discusses neutron capture processes in fission reactors. The sixth chapter covers applications to stellar nucleosynthesis and the seventh chapter covers the practical uses of neutron capture gamma-ray spectroscopy. The book is meant for the use of graduate students who are knowledgeable about basic nuclear physics.

Table of Contents

  • List of Abbreviations


    I. Theory of Slow Neutron Radiative Capture

    I.A Introduction

    I.A.1 The Electromagnetic Interaction

    I.A.2 Photons in Reaction Theory

    I.B Statistical Theory of Radiative Capture

    I.B.1 Premises

    I.B.2 Partial Radiative Widths

    I.B.3 Gamma-ray Spectrum

    I.B.4 Total Radiative Widths

    I.B.5 Width Distributions

    I.C Systematic Properties of Radiative Neutron Capture

    I.C.1 Resonance-averaged Cross Sections

    I.C.2 Formalism for Averaged Capture Cross Sections

    I.C.3 The Distribution of Radiative Strength in Nuclei

    II. Fast Neutron Radiative Capture

    II.A Direct and Semi-direct Capture Reactions

    II.A.l The Symmetry Potential

    II.A.2 The Giant Dipole Resonance

    II.A.3 Derivation of the Direct-Semi-direct Cross SectionH

    II.A.4 The Direct-Semi-direct Cross Section

    II.A.5 Isospin Splitting of the Giant Dipole Resonance

    II.A.6 Direct-Semi-direct Capture in Deformed Nuclei

    II.A.7 Contribution of Other Giant Multipole Resonances 52

    II.B Experimental Results

    II.B.l Gamma-ray Spectra

    II.B.2 Partial Capture Cross Sections

    II.B.3 Systematics of 14-15 MeV Capture Cross Sections

    II.B.4 Angular Distribution of γ Rays

    III. Methods for Calculating Neutron Capture Cross Sections and Gamma-ray Energy Spectra

    III.A Scope

    III.B Statistical Model Calculations

    III.B.l The Hauser-Feshbach (HF) Equation

    III.B.2 The Gamma-Ray Cascade

    III.B.3 Neutron Transmission Coefficients

    III.B.4 Total Radiative Widths

    III.C Expressions for E1 Photon Strengths

    III.D Giant Dipole Resonance Systematics

    III.E Nuclear Level Densities

    III.E.l The Gilbert-Cameron Formalism

    III.E.2 The Spin Cut-off Parameter

    III.E.3 The Yrast Limit

    III.F Sample Calculation: 89Υ(n,γ)90CΥ

    III.F.l Specifications of the 89Y+n Problem

    III.F.2 Results from the 89Y+n Calculation

    III.G Summary

    IV. Measurement Techniques for Radiative Neutron Capture

    IV.A Introduction

    IV.A.1 The Radiative Neutron Capture Reaction

    IV.A.2 Neutron Sources

    IV.A.3 Flux Measurements

    IV.B Capture Event Detection

    IV.B.l Indirect Techniques

    IV.B.2 Prompt Radiation Detection

    IV.B.3 Gamma-ray Spectral Measurements

    IV.C Analysis of Measurements

    IV.C.l Thermal and Fast Neutron Energy Range

    IV.C.2 Resonance Neutron Range

    V. Neutron Capture Processes in Fission Reactors

    V.A Introduction

    V.B Capture in Fertile and Fissile Nuclei

    V.B.l Fertile Nuclei

    V.B.2 Fissile Nuclei

    V.C Capture in Structural, Coolant and Shielding Materials

    V.D Capture in Fission Product Nuclei

    V.D.l Thermal Reactors

    V.D.2 Fast Reactors

    V.E The Production of Higher Actinides

    VI. Applications to Stellar Nucleosynthesis

    VI.A Introduction

    VI.B s-Process Nucleosynthesis

    VI.C Age of the s-Process and the Stellar Environment

    VI.D r-Process Chronometer and the Age of the Universe

    VI.E Summary

    VII. Practical Uses of Neutron Capture Gamma-ray Spectroscopy

    VII.A Introduction

    VII.B Fundamentals

    VII.C The Prompt Gamma-ray Technique (PGA)

    VII.C.1 Sensitivity

    VII.C.2 Sources and Detectors

    VII.C.3 Applications of Reactor-based PGA

    VII.C.4 Mobile Systems

    VII.C.5 Biomedicine

    VII.C.6 Elemental Analyses for Petroleum and Mineral Exploration

    VII.C.7 Process Stream Analysis of Coal

    VII.D Non-analytical Uses of Neutron Capture

    VII.E Conclusions

    VIII. Summary and Concluding Remarks



    Subject Index

Product details

  • No. of pages: 284
  • Language: English
  • Copyright: © Pergamon 1984
  • Published: January 1, 1984
  • Imprint: Pergamon
  • eBook ISBN: 9781483152431

About the Authors

B. J. Allen

I. Bergqvist

R. E. Chrien

About the Editors

A. Michaudon

S. Cierjacks

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