Measurements Of Neutron Capture Cross Sections Relevant To The S Process Of Element Formation In Stars PDF Download

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Neutron Capture Cross Sections for 86Sr and 87Sr at Stellar Temperatures. Revision 1

Neutron Capture Cross Sections for 86Sr and 87Sr at Stellar Temperatures. Revision 1
Author:
Publisher:
Total Pages:
Release: 1986
Genre:
ISBN:

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Recent work on s-process nucleosynthesis has focused attention on the investigation of capture cross sections for nuclei in the mass region near the N = 50 closed neutron shell. Of special astrophysical interest are (i) the analysis of the s-process branching through 85Kr as a monitor of stellar neutron density and temperature and (ii) the investigation of the possible chronometric pair 87Rb-87Sr as an independent measure of the age of the galaxy. For both problems the capture cross sections of the two pure s-process nuclei 86Sr and 87Sr have to be known to an accuracy of 5% or better. The current investigation of the neutron capture cross sections for 86Sr and 87Sr was undertaken to extend recent measurements by Walter and Beer to energies below 3.5 keV, where strong resonances are known to exist, and to explore the discrepancy in the results of the Maxwellian averaged capture cross section of 87Sr at kT = 30 keV as reported by previous investigators. 9 refs., 1 fig.


Advances in Nuclear Physics

Advances in Nuclear Physics
Author: Michel Baranger
Publisher: Springer Science & Business Media
Total Pages: 463
Release: 2012-12-06
Genre: Science
ISBN: 1461582288

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1 The Investigation of Hole States in Nuclei by Means of Knockout and Other Reactions.- 1. Introduction.- 2. Formalism for Knockout and Pickup Reactions.- 2.1. The Matrix Element and Overlap Integral.- 2.2 The Single-Nucleon Case.- 2.3. The Two-Nucleon Case.- 2.4. The Multi-Nucleon Case.- 2.5. Distortion and Finite-Range Effects.- 3. Single-Nucleon Knockout and Related Reactions.- 3.1. Comparison of Knockout and Pickup Reactions.- 3.2. Special Features of Knockout Reactions.- 3.3. Spectroscopic Studies.- 3.4. Proton States.- 3.5. Neutron States.- 4. Cluster Knockout and Related Reactions.- 4.1.


Resonance Parameters for Measured KeV Neutron Capture Cross Sections

Resonance Parameters for Measured KeV Neutron Capture Cross Sections
Author: A. R. de L. Musgrove
Publisher:
Total Pages: 5
Release: 1969
Genre: Neutron cross sections
ISBN: 9780642993656

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"All available neutron capture cross sections in the keV region (~ 5 to 100 keV) have been fitted with resonance parameters. Capture cross sections for nuclides with reasonably well known average s-wave parameters, but no measured cross section, have been calculated and tabulated using p- and d-wave strength functions interpolated between fitted values. Several of these nuclides are of interest in the theory of slow nucleosynthesis of heavy elements in stars, and the product of cosmic abundance (due to the s-process) and capture cross section at 30 keV has been plotted versus mass number"--Title page.


Neutron Cross Sections

Neutron Cross Sections
Author: S Mughabghab
Publisher: Elsevier
Total Pages: 847
Release: 2012-12-02
Genre: Science
ISBN: 0323142354

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Neutron Cross Sections, Volume 1: Neutron Resonance Parameters and Thermal Cross Sections, Part A represents the fourth edition of what was previously known as BNL-325, Neutron Cross Sections, Volume 1. This three-chapter book provides the extensive list of detailed individual resonance parameters for each isotope. The first chapter deals with the thermal cross sections and average resonance parameters, as well as the physics of thermal and resonance neutrons, with particular emphasis on evaluation methods. This chapter also includes tables of standards of capture cross sections and scattering lengths, and commonly used nuclear physics formulas. The second chapter covers the direct or valence capture and the Brink-Axel treatment of electric dipole radiation. These topics are followed by a discussion on spin-dependent scattering lengths that are of interest to solid state. The third chapter describes the Maxwellian 30-keV capture cross sections that are of importance to studies of nucleosynthesis and age of the universe. This chapter also examines the s- and p-wave average radiative widths and gamma-ray strength functions that are required in capture cross section measurements. This book will appeal to nuclear and astrophysicists.


Origin And Evolution Of The Elements - Proceedings Of The International Symposium

Origin And Evolution Of The Elements - Proceedings Of The International Symposium
Author: Shigeru Kubono
Publisher: World Scientific
Total Pages: 294
Release: 1993-08-19
Genre:
ISBN: 9814553107

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This volume covers a variety of modern aspects of the observational, experimental and theoretical studies on the origin, evolution and distribution of the elements in the Universe. The topics include “Early Universe and Primordial Nucleosynthesis”, “Evolution of Galaxies”, “Nucleosynthesis in Novae and Supernovae”, “Neutron Stars and Hadronic Matter”, and “Nuclear Astrophysics”.