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Experimental Determination Of The Stellar Neutron Capture Cross Sections Of Sup148sm And Sup150sm And The Consequences For The S Process
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Book Synopsis Experimental determination of the stellar neutron capture cross sections of SUP(148)SM and SUP(150)SM and the consequences for the S-process by : K. H. Guber
Download or read book Experimental determination of the stellar neutron capture cross sections of SUP(148)SM and SUP(150)SM and the consequences for the S-process written by K. H. Guber and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1994 with total page 1142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-resolution Neutron Capture and Transmission Measurements and the Stellar Neutron Capture Cross Sections Of[sup 116,120]n by :
Download or read book High-resolution Neutron Capture and Transmission Measurements and the Stellar Neutron Capture Cross Sections Of[sup 116,120]n written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Government reports annual index by :
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1094 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Capture Cross Sections and the S-process by :
Download or read book Neutron Capture Cross Sections and the S-process written by and published by . This book was released on 1967 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-resolution Neutron Capture and Transmission Measurements and the Stellar Neutron Capture Cross Sections of {sup 116,120}Sn by :
Download or read book High-resolution Neutron Capture and Transmission Measurements and the Stellar Neutron Capture Cross Sections of {sup 116,120}Sn written by and published by . This book was released on 1997 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 116Sn. 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 12°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 121Sn) the relative abundances of the three s-only isotopes of Te.
Book Synopsis Target Correlation Effects on Neutron-nucleus Total, Absorption, and Abrasion Cross Sections by : Francis A. Cucinotta
Download or read book Target Correlation Effects on Neutron-nucleus Total, Absorption, and Abrasion Cross Sections written by Francis A. Cucinotta and published by . This book was released on 1991 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Capture Cross Sections for 86Sr and 87Sr at Stellar Temperatures. Revision 1 by :
Download or read book Neutron Capture Cross Sections for 86Sr and 87Sr at Stellar Temperatures. Revision 1 written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Stellar Neutron Capture Cross Section of the Unstable Branching Point 151 Sm by :
Download or read book Stellar Neutron Capture Cross Section of the Unstable Branching Point 151 Sm written by and published by . This book was released on 2004 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stellar Neutron Capture Cross Sections of Pr and Dy Isotopes by :
Download or read book Stellar Neutron Capture Cross Sections of Pr and Dy Isotopes written by and published by . This book was released on 1998 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamic Stellar Neutron-capture Nucleosynthesis by :
Download or read book Dynamic Stellar Neutron-capture Nucleosynthesis written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We summarize results from a detailed parameter study of the s-process in models which produce an exponential distribution of exposures by sequential irradiations and dredge up in the stellar environment. The calculations are based on a complete network of measured and calculated neutron capture and beta-decay rates as well as estimates for their temperature dependence. In the framework of these models we identify and systematically vary the astrophysical variables which affect the observed solar-system sigmaN (cross section times abundance) curve. Constraints are placed on the s-process neutron exposure and flux as well as the temperatures, densities, neutron pulse shape and inter-pulse period. The results also highlight important needs for better nuclear data in various mass regions. 26 references.
Book Synopsis Stellar Neutron Capture Cross Sections of the Nd Isotopes by :
Download or read book Stellar Neutron Capture Cross Sections of the Nd Isotopes written by and published by . This book was released on 1997 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stellar Neutron Capture Cross Sections of the Xe Isotopes by :
Download or read book Stellar Neutron Capture Cross Sections of the Xe Isotopes written by and published by . This book was released on 2001 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stellar Nucleosynthesis and the 24-keV Neutron Capture Cross Sections of Some Heavy Nuclei by :
Download or read book Stellar Nucleosynthesis and the 24-keV Neutron Capture Cross Sections of Some Heavy Nuclei written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The neutron capture cross sections of 112Sn, 13°Ba, 146Nd, 148Nd, 186W, 19°Os, and 192Os at 24 keV neutron energy were measured with respect to 197Au by activation in a 24 keV neutron beam at the Brookhaven High Flux Beam Reactor. The reliability of this technique was verified by remeasuring the cross section of 186W and comparing it to previous measurements. This continuing series of measurements will provide a more reliable data base for nucleosynthesis calculations. 12 references.
Book Synopsis Measurements of Neutron Capture Cross Sections Relevant to the S-process of Element Formation in Stars by : Daniel Bartlett Stroud
Download or read book Measurements of Neutron Capture Cross Sections Relevant to the S-process of Element Formation in Stars written by Daniel Bartlett Stroud and published by . This book was released on 1972 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stellar Neutron Capture Cross Sections of the Gd Isotopes by : K. Wisshak
Download or read book Stellar Neutron Capture Cross Sections of the Gd Isotopes written by K. Wisshak and published by . This book was released on 1910 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stellar Neutron Capture Cross Sections of the Lu Isotopes by :
Download or read book Stellar Neutron Capture Cross Sections of the Lu Isotopes written by and published by . This book was released on 2004 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download High-resolution Neutron Capture and Transmission Measurements and the Stellar Neutron Capture Cross Sections Of[sup 116,120]n PDF Online Free](https://books.google.com/books/content/images/frontcover/8lmnDAEACAAJ?fife=w200-h370)
