Measurements of Neutron Capture Cross Sections Relevant to the S-process of Element Formation in Stars PDF Download
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Author: Daniel Bartlett Stroud
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 272
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Book Description
Author: Daniel Bartlett Stroud
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 272
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 44
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Author: Michel Baranger
Publisher: Springer Science & Business Media
ISBN: 1461582288
Category : Science
Languages : en
Pages : 463
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Book Description
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.
Author: A. R. de L. Musgrove
Publisher:
ISBN: 9780642993656
Category : Neutron cross sections
Languages : en
Pages : 5
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Book Description
"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.
Author: P. B. Hemmig
Publisher:
ISBN:
Category : Neutron cross sections
Languages : en
Pages : 582
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Author: David T. Goldman
Publisher:
ISBN:
Category : Neutron cross sections
Languages : en
Pages : 670
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Author: S Mughabghab
Publisher: Elsevier
ISBN: 0323142354
Category : Science
Languages : en
Pages : 847
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Book Description
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.
![High-resolution Neutron Capture and Transmission Measurements and the Stellar Neutron Capture Cross Sections Of[sup 116,120]n PDF](https://books.google.com/books/content/images/frontcover/8lmnDAEACAAJ?fife=w80-h100)
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Improved astrophysical reaction rates for[sup 116,120]Sn(n, [gamma]) are of interest because nucleosynthesis models have not been able to reproduce the observed abundances in this mass region. For example, previous s-process calculations have consistently underproduced the s-only isotope[sup 116]Sn. Also, these studies have resulted in residual reprocess abundances for the tin isotopes which are systematically larger than predicted by reprocess calculations. It has been suggested that these problems could be solved by reducing the solar tin abundance by 10-20%, but there is no experimental evidence to justify this renormalization. Instead, it is possible that the problem lies in the (n, T) cross sections used in the reaction network calculations or in the s-process models. One reason to suspect the (n, [gamma]) data is that previous measurements did not extend to low enough energies to determine accurately the Maxwellian-averaged capture cross sections at the low temperatures (kT=6-8 keV) favored by the most recent stellar models of the s process. Also, the two most recent high-precision measurements of the[sup 120]Sn(n, [gamma]) cross section are in serious disagreement. Because of its small size, this cross section could affect (via the s-process branching at[sup 121]Sn) the relative abundances of the three s-only isotopes of Te.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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.
Author: David T. Goldman
Publisher:
ISBN:
Category : Neutron cross sections
Languages : en
Pages : 680
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Book Description
