Measurement Of Sup 238 Un N Gamma And Sup 7 Lin N Gamma Gamma Ray Production Cross Sections 0 48 To 5 0 Mev Preliminary Results

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Measurement of /sup 238/U(n, N'. Gamma.) and /sup 7/Li(n, N'. Gamma.) Gamma-ray Production Cross Sections. [0. 48 to 5. 0 MeV, Preliminary Results].

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (96 download)

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Book Synopsis Measurement of /sup 238/U(n, N'. Gamma.) and /sup 7/Li(n, N'. Gamma.) Gamma-ray Production Cross Sections. [0. 48 to 5. 0 MeV, Preliminary Results]. by :

Download or read book Measurement of /sup 238/U(n, N'. Gamma.) and /sup 7/Li(n, N'. Gamma.) Gamma-ray Production Cross Sections. [0. 48 to 5. 0 MeV, Preliminary Results]. written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-of-flight techniques and a 95-cm/sup 3/ Ge(Li) detector positioned 20 m from the ORELA white neutron source have been utilized to measure 125/sup 0/ cross sections for the production of gamma rays in /sup 238/U and /sup 7/Li samples by 0.48 to 5.0-MeV neutrons. The incident neutron flux was determined with a proton-recoil telescope which used a solid-state, recoil-proton detector. Altogether, 28 cross sections for /sup 238/U transitions from levels with 680 to 1224 keV of excitation were measured. In addition, 7 branching ratios for weak /sup 238/U transitions and the /sup 7/Li(n, n'.gamma.)/sup 7/Li* (478 keV) cross section were measured. From these data and other level-decay information, preliminary neutron inelastic scattering cross sections were constructed and compared with those at 680, 732, 827, 965, 1048, and 1170-keV of excitation from the proposed ENDF/B-V evaluation. 40 references.

Measurement of [sup]238[/sup]U(n, N'gamma)[sup]238[/sup]U* Cross Sections

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Measurement of [sup]238[/sup]U(n, N'gamma)[sup]238[/sup]U* Cross Sections by :

Download or read book Measurement of [sup]238[/sup]U(n, N'gamma)[sup]238[/sup]U* Cross Sections written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Production cross sections for gamma-ray transitions produced by 0.5- to 5.0-MeV neutrons on /sup 238/U were measured with a 95-cm/sup 3/ Ge(Li) detector (at 125/sup 0/), the ORELA neutron source, and a recoil proton telescope. From these data and other decay scheme information, inelastic scattering cross sections for levels from 680 to 1224 keV of excitation were constructed and compared with statistical model calculations and the ENDF/B-V evaluation. 5 figures.

Measurement of 238U(n,n?)́ and 7Li (n,n?)́ Gamma-ray Production Cross Sections

Author : David K. Olsen
Publisher :
ISBN 13 :
Total Pages : 115 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Measurement of 238U(n,n?)́ and 7Li (n,n?)́ Gamma-ray Production Cross Sections by : David K. Olsen

Download or read book Measurement of 238U(n,n?)́ and 7Li (n,n?)́ Gamma-ray Production Cross Sections written by David K. Olsen and published by . This book was released on 1979 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:

נקמה אכזרית

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (233 download)

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Book Synopsis נקמה אכזרית by :

Download or read book נקמה אכזרית written by and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

239Pu(n,2n) 238Pu Cross Section Inferred from IDA Calculations and GEANIE Measurements

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ISBN 13 :
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Book Synopsis 239Pu(n,2n) 238Pu Cross Section Inferred from IDA Calculations and GEANIE Measurements by :

Download or read book 239Pu(n,2n) 238Pu Cross Section Inferred from IDA Calculations and GEANIE Measurements written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the latest 239Pu(n,2n)238Pu cross sections inferred from calculations performed with the nuclear reaction-modeling code system, IDA, coupled with experimental measurements of partial [gamma]-ray cross sections for incident neutron energies ranging from 5.68 to 17.18 MeV. It is found that the inferred 239Pu(n,2n)238Pu cross section peaks at E{sub inc} ≈ 11.4 MeV with a peak value of approximately 326 mb. At E{sub inc} ≈ 14 MeV, the inferred 239Pu(n,2n)238Pu cross section is found to be in good agreement with previous radio-chemical measurements by Lockheed. However, the shape of the inferred 239Pu(n,2n)238Pu cross section differs significantly from previous evaluations of ENDL, ENDF/B-V and ENDF/B-VI. In our calculations, direct, preequilibrium, and compound reactions are included. Also considered in the modeling are fission and [gamma]-cascade processes in addition to particle emission. The main components of physics adopted and the parameters used in our calculations are discussed. Good agreement of the inferred 239Pu(n,2n)238Pu cross sections derived separately from IDA and GNASH calculations is shown. The two inferences provide an estimate of variations in the deduced 239Pu(n,2n)238Pu cross section originating from modeling.

The 239 Pu(n,2n) 238 Pu Cross Section: Preliminary Calculations

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (452 download)

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Book Synopsis The 239 Pu(n,2n) 238 Pu Cross Section: Preliminary Calculations by :

Download or read book The 239 Pu(n,2n) 238 Pu Cross Section: Preliminary Calculations written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary motivation for the present work is to provide theoretical values for the ratio of the partial 239Pu(n,2nxy)238Pu to total 239Pu(n,2n)238Pu cross section for several discrete gamma transitions. Results and conclusions of preliminary calculations from threshold to 20 MeV are presented. Calculations are based on theoretical models with parameters obtained from the literature or from our ad hoc systematics. Optical model cross sections and transmission coefficients were determined using the coupled-channels method. The calculations included a preequilibrium component followed by multiple particle and gamma-ray emissions. Fission competition was included at all stages of de-excitation. Suggestions for further verifications and possible improvements are provided.

Measurement of 238U(n, N[́gamma]) and 7Li (n, N[́gamma]) Gamma-ray Production Cross Sections

Author : G. L. Morgan
Publisher :
ISBN 13 :
Total Pages : 115 pages
Book Rating : 4.:/5 (8 download)

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Book Synopsis Measurement of 238U(n, N[́gamma]) and 7Li (n, N[́gamma]) Gamma-ray Production Cross Sections by : G. L. Morgan

Download or read book Measurement of 238U(n, N[́gamma]) and 7Li (n, N[́gamma]) Gamma-ray Production Cross Sections written by G. L. Morgan and published by . This book was released on 1979 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Measurement of Gamma-ray Total Absorption Cross Sections Using a [sup 56]Co Source

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ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Measurement of Gamma-ray Total Absorption Cross Sections Using a [sup 56]Co Source by :

Download or read book Measurement of Gamma-ray Total Absorption Cross Sections Using a [sup 56]Co Source written by and published by . This book was released on 2008 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have used a 150 MBq [sup 56]Co source to perform gamma-ray total absorption cross section measurements with very high precision. The use of [sup 56]Co allowed us to simultaneously measure the total cross section at 15 energies ranging from 0.847 MeV to 3.451 MeV. Seven sample materials were measured: Be, C, Cu, Ta, W, Pb, and U. In general, the measurement precision is better than 0.5% and in all cases better than 1.3%.

New Technique for Measuring Photonuclear Cross Sections and Its Application to the Cu63([gamma], N)Cu62 and C12([gamma], N)C11 Reactions

Author : Lester L. Newkirk
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis New Technique for Measuring Photonuclear Cross Sections and Its Application to the Cu63([gamma], N)Cu62 and C12([gamma], N)C11 Reactions by : Lester L. Newkirk

Download or read book New Technique for Measuring Photonuclear Cross Sections and Its Application to the Cu63([gamma], N)Cu62 and C12([gamma], N)C11 Reactions written by Lester L. Newkirk and published by . This book was released on 1951 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Sup 48 Ti(n, Xnpa Gamma Reaction Cross Sections Using Spallation Neutrons for E Sub N

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (682 download)

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Book Synopsis Sup 48 Ti(n, Xnpa Gamma Reaction Cross Sections Using Spallation Neutrons for E Sub N by :

Download or read book Sup 48 Ti(n, Xnpa Gamma Reaction Cross Sections Using Spallation Neutrons for E Sub N written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: [Gamma]-ray excitation functions have been measured for the interaction of fast neutrons with [sup 48]Ti (neutron energy from 1 MeV to 250 MeV). The Los Alamos National Laboratory spallation neutron source, at the LANSCE/WNR facility, provided a ''white'' neutron beam which is produced by bombarding a natural W target with a pulsed proton beam. The prompt-reaction [gamma] rays were measured with the large-scale Compton-suppressed Ge spectrometer, GEANIE. Neutron energies were determined by the time-of-flight technique. Excitation functions were converted to partial [gamma]-ray cross sections, taking into account the dead-time correction, the target thickness, the detector efficiency, and neutron flux (monitored with an in-line fission chamber). The data analysis is presented here for neutron energies between 1 to 20 MeV. Partial [gamma]-ray cross sections for transitions in [sup 47,48]Ti, [sup 48]Sc, and [sup 45]Ca have been determined. These results are compared to Hauser-Feshbach predictions calculated using the STAPRE code, which includes compound nuclear and pre-equilibrium emission. The partial cross sections for [gamma] rays, whose discrete [gamma]-ray cascade path leads to the ground state in [sup 48]Ti, [sup 47]Ti, [sup 48]Sc, and [sup 45]Ca have been summed to obtain estimates of the lower limits for reaction cross sections. Partial cross sections for unobserved [gamma]-rays are predicted from the STAPRE code. These lower limits are combined with Hauser-Feshbach calculations to deduce [sup 48]Ti(n, n')[sup 48]Ti, [sup 48]Ti(n,2n)[sup 47]Ti, [sup 48]Ti(n, p)[sup 48]Sc, and [sup 48]Ti(n, [alpha])[sup 45]Ca reaction channel cross sections.

Absolute Partial Gamma-Ray Cross Sections in 238U(n, Xngamma) Reactions

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (873 download)

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Book Synopsis Absolute Partial Gamma-Ray Cross Sections in 238U(n, Xngamma) Reactions by :

Download or read book Absolute Partial Gamma-Ray Cross Sections in 238U(n, Xngamma) Reactions written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Cross Sections for Production of the 15.10 MeV and Other Astrophysically Significant Gamma-ray Lines Through Excitation and Spallation of Sup 12 C and Sup 16 O with Protons

Download Cross Sections for Production of the 15.10 MeV and Other Astrophysically Significant Gamma-ray Lines Through Excitation and Spallation of Sup 12 C and Sup 16 O with Protons PDF Online Free

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ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Cross Sections for Production of the 15.10 MeV and Other Astrophysically Significant Gamma-ray Lines Through Excitation and Spallation of Sup 12 C and Sup 16 O with Protons by :

Download or read book Cross Sections for Production of the 15.10 MeV and Other Astrophysically Significant Gamma-ray Lines Through Excitation and Spallation of Sup 12 C and Sup 16 O with Protons written by and published by . This book was released on 1986 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Estimating Reaction Cross Sections from Measured [Gamma]-Ray Yields

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (873 download)

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Book Synopsis Estimating Reaction Cross Sections from Measured [Gamma]-Ray Yields by :

Download or read book Estimating Reaction Cross Sections from Measured [Gamma]-Ray Yields written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A procedure is presented to deduce the reaction-channel cross section from measured partial [gamma]-ray cross sections. In its simplest form, the procedure consists in adding complementary measured and calculated contributions to produce the channel cross section. A matrix formalism is introduced to provide a rigorous framework for this approach. The formalism is illustrated using a fictitious product nucleus with a simple level scheme, and a general algorithm is presented to process any level scheme. In order to circumvent the cumbersome algebra that can arise in the matrix formalism, a more intuitive graphical procedure is introduced to obtain the same reaction cross-section estimate. The features and limitations of the method are discussed, and the technique is applied to extract the 235U (n,2n) and 239Pu(n,2n) cross sections from experimental partial [gamma]-ray cross sections, coupled with (enhanced) Hauser-Feshbach calculations.

The 235U(n,2n(gamma)) Yrast Partial Gamma-Ray Cross Sections: A Report on the 1998 -- 1999 GEANIE Data and Analysis Techniques

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (682 download)

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Book Synopsis The 235U(n,2n(gamma)) Yrast Partial Gamma-Ray Cross Sections: A Report on the 1998 -- 1999 GEANIE Data and Analysis Techniques by :

Download or read book The 235U(n,2n(gamma)) Yrast Partial Gamma-Ray Cross Sections: A Report on the 1998 -- 1999 GEANIE Data and Analysis Techniques written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of partial [sup 235]U(n,2n[gamma]) [gamma]-ray cross sections have been carried out as a function of incident neutron energy using the GEANIE spectrometer at LANSCE/WNR. The yields of [gamma] rays resulting from the population of discrete levels in the residual nucleus [sup 234]U have been measured at incident neutron energies in the 1-20-MeV range. These data provide, with the aid of nuclear reaction modeling, a measurement of the [sup 235]U(n,2n) reaction cross section and serve as a proof of principle of the y-ray technique for the parallel 23gPu(n,2n) measurement [l]. This paper presents the analysis of the [gamma]-ray data and the extraction of partial [gamma]-ray cross sections as a function of incident neutron energy. Uncertainties associated with the spectroscopic analysis of the data and validation of the results are discussed in detail.

The 239 Pu(n,2n)238Pu Cross Section

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis The 239 Pu(n,2n)238Pu Cross Section by :

Download or read book The 239 Pu(n,2n)238Pu Cross Section written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary motivation for the present work is to provide theoretical values for the ratio of the partial 239Pu(n,2nx?)238Pu to total 239 Pu(n,2n)238Pu cross section for several discrete gamma transitions. Results and conclusions of preliminary calculations from threshold to 20 MeV are presented. Calculations are based on theoretical models with parameters obtained from the literature or from our ad hoc systematics. Optical model cross sections and transmission coefficients were determined using the coupled-channels method. The calculations included a preequilibrium component followed by multiple particle and gamma-ray emissions. Fission competition was included at all stages of de-excitation. Suggestions for further verifications and possible improvements are provided.

Measurement of 150-Sm(n,2ngammai) 149-Sm Cross Sections Between Threshold and 20 MeV.

Author : R. Nelson
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (316 download)

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Book Synopsis Measurement of 150-Sm(n,2ngammai) 149-Sm Cross Sections Between Threshold and 20 MeV. by : R. Nelson

Download or read book Measurement of 150-Sm(n,2ngammai) 149-Sm Cross Sections Between Threshold and 20 MeV. written by R. Nelson and published by . This book was released on 2004 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Absolute partial {gamma}-ray cross sections for the production of discrete {gamma}-rays from the reaction {sup 150}Sm(n,2n{gamma}{sub i}){sup 149}Sm were measured using the GEANIE {gamma}-ray spectrometer coupled with the intense white neutron source at WNR/LANSCE. The measurements were made for incident neutron energies between threshold (8.04 MeV) and 20 MeV. The partial cross sections for 21 {gamma}-rays were extracted from the data. Of these, 17 were compared to calculations performed using the enhanced Hauser-Feshbach code STAPRE. The partial {gamma}-ray cross sections of the observed parallel decay paths to the ground state were summed, forming a lower bound for the (n,2n) reaction channel. A combination of theory and experiment was then used to deduce the (n,2n) reaction channel cross section.

Measurement of the /sup 238/U (eta, . Gamma.) Cross Section with an Fe-filtered Neutron Beam. [24. 3 to 181. 4 KeV].

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Measurement of the /sup 238/U (eta, . Gamma.) Cross Section with an Fe-filtered Neutron Beam. [24. 3 to 181. 4 KeV]. by :

Download or read book Measurement of the /sup 238/U (eta, . Gamma.) Cross Section with an Fe-filtered Neutron Beam. [24. 3 to 181. 4 KeV]. written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The neutron capture cross section of /sup 238/U was measured near 24.3, 69.8, 80.3, 131.0, 165.9 and 181.4 keV with the Fe-filtered neutron time-of-flight technique. The measured capture cross sections at these energies are respectively (496 +- 15), (297 +- 22), (190 +- 9), (167 +- 6), (128 +- 7), and (118 +- 6) mb. The evaluated ENDF/B-IV capture cross section is in satisfactory agreement with the results of this measurement near 24.3 and 131.0 keV, but discrepancies of about 10 to 20 percent are observed at the other energies.