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High Resolution Neutron Capture And Transmission Measurements And The Stellar Neutron Capture Cross Sections Ofsup 116120n
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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 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 Neutron Cross Sections and Related Measurements by :
Download or read book Neutron Cross Sections and Related Measurements written by and published by . This book was released on 1966 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Neutron Cross Sections and Technology by : David T. Goldman
Download or read book Neutron Cross Sections and Technology written by David T. Goldman and published by . This book was released on 1968 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Conference on Neutron Cross Section Technology by : P. B. Hemmig
Download or read book Conference on Neutron Cross Section Technology written by P. B. Hemmig and published by . This book was released on 1966 with total page 572 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 Sections of the Cd Isotopes by :
Download or read book Stellar Neutron Capture Cross Sections of the Cd Isotopes written by and published by . This book was released on 2001 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurements of Low Energy Neutron Cross Sections of Non-fissile Nuclides and Their by :
Download or read book Measurements of Low Energy Neutron Cross Sections of Non-fissile Nuclides and Their written by and published by . This book was released on 1966 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Neutron Capture and Total Cross Section Measurements On[sup 88]r and Their Impact on S-process Nucleosynthesis by :
Download or read book New Neutron Capture and Total Cross Section Measurements On[sup 88]r and Their Impact on S-process Nucleosynthesis written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors have made new and improved measurements of the neutron capture and total cross sections of[sup 88]Sr at the Oak Ridge Electron Linear Accelerator (ORELA). Improvements over previous measurements include a wider incident neutron energy range, the use of metallic rather than carbonate samples, better background subtraction, reduced sensitivity to sample-dependent backgrounds, and better pulse-height weighting functions. Because of its small cross section, the[sup 88]Sr(n, [gamma]) reaction is an important bottleneck during the s-process nucleosynthesis. Hence, an accurate determination of this rate is needed to better constrain the neutron exposure in s-process models and to more fully exploit the recently discovered isotopic anomalies in certain meteorites. They describe the experimental procedures, compare the results to previous data, and discuss their astrophysical impact.
Book Synopsis New Neutron Capture and Transmission Measurements for {sup 134,136}Ba at ORELA and Their Impact on S-process Nucleosynthesis Calculations by :
Download or read book New Neutron Capture and Transmission Measurements for {sup 134,136}Ba at ORELA and Their Impact on S-process Nucleosynthesis Calculations written by and published by . This book was released on 1996 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have made high-resolution neutron capture and transmission measurements on isotopically enriched samples of 134Ba and 136Ba at the Oak Ridge Electron Linear Accelerator (ORELA) in the energy range from 20 eV to 500 keV. Previous measurements had a lower energy limit of 3 - 5 keV, which is too high to determine accurately the Maxwellian-averaged capture cross section at the low temperatures (kT (almost equal to) 6 - 12 keV) favored by the most recent stellar models of the {ital s}-process. Our results for the astrophysical reaction rates are in good agreement with the most recent previous measurement at the classical {ital s}-process temperature, kT = 30 keV, but show significant differences at lower 40 temperatures. We discuss the astrophysical implications of these differences.
Book Synopsis Stellar neutron capture cross sections of the Gd isotopes by :
Download or read book Stellar neutron capture cross sections of the Gd isotopes written by and published by . This book was released on 1995 with total page 66 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 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:
Book Synopsis Stellar Neutron Capture Cross Sections of the Gd Isopes by :
Download or read book Stellar Neutron Capture Cross Sections of the Gd Isopes written by and published by . This book was released on 1995 with total page 66 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:
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