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Direct Semidirect And Multistep Processes In Radiative Proton Capture Reactions At Intermediate Energies
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Book Synopsis Direct-semidirect and Multistep Processes in Radiative Proton Capture Reactions at Intermediate Energies by : Wooyoung Kim
Download or read book Direct-semidirect and Multistep Processes in Radiative Proton Capture Reactions at Intermediate Energies written by Wooyoung Kim and published by . This book was released on 1986 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Extended Direct Semidirect Mechanism and the Role of Multistep Processes in Fast Nucleon Radiative Capture by :
Download or read book Extended Direct Semidirect Mechanism and the Role of Multistep Processes in Fast Nucleon Radiative Capture written by and published by . This book was released on 1997 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have recently developed an extension of the direct-semidirect (DSD) radiative capture model to unstable final states and have confirmed its utility in explaining the spectrum of rays from capture of polarized 19.6-MeV protons on 89Y. It was found that the extended DSD model, supplemented by a Hauser-Feshbach contribution, successfully explains the observed spectra, angular distributions, and analyzing powers, without requiring additional mechanisms, such as precompound or multistep emission, or nucleon-nucleon bremsstrahlung. In this contribution we show that the model also successfully explains data at higher energies (34 MeV incident protons), and that there is no need for additional contributions other than Hauser-Feshbach at this energy as well. The extended DSD model treats capture to unbound final states and also to bound single-particle states that damp into a compound system. An optical (complex) potential is used to describe the propagation of the captured particle. Application of this model to the [gamma] spectrum in the 89Y(p, [gamma]) reaction at 19.6 MeV is shown. We have performed new calculations at higher energy (34 MeV protons), and have compared them with the spectra and angular distributions measured in [2] on targets of natural Cu, Ag, and Au. An example of the results, for the spectrum from Cu, is shown in the right-hand part of the figure. In both cases the DSD calculation is shown by a solid line, and a Hauser-Feshbach calculation by a dashed line. The 34-MeV calculations were very similar to those at 19.6 MeV as described in [1]. In both cases, the sum of DSD and Hauser-Feshbach calculations adequately describes the measured spectra. Although not shown, the angular distributions are also well described. There are no significant deficiencies in the comparison with experiment that indicate a need for multistep processes or other additional reaction mechanisms. Such processes are therefore required, if at all, only at significantly higher energies than reported here. On the basis of these results, we believe that the extended DSD model is the most appropriate tool for modeling the high-energy portion of the gamma spectrum from nu- cleon capture. On the other hand, simple precompound treatments such as the exciton model should remain important for emission in reactions with complex projectiles (e.g. d, [alpha], heavy ions), as long as an easily-implemented quantum mechanical model is not available.
Book Synopsis Comprehensive Dissertation Index by :
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1989 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radiative Proton Capture in Light Nuclei at Intermediate Energies by : Bo Höistad
Download or read book Radiative Proton Capture in Light Nuclei at Intermediate Energies written by Bo Höistad and published by . This book was released on 1993 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindex written by and published by . This book was released on 1987 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1987 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proton and He[superscript]3 Radiative Capture Reactions Leading to States of B[superscript]10 and C[superscript]12 by : Sherwyn Leslie Blatt
Download or read book Proton and He[superscript]3 Radiative Capture Reactions Leading to States of B[superscript]10 and C[superscript]12 written by Sherwyn Leslie Blatt and published by . This book was released on 1964 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct Radiative Proton Capture Reactions in Cerium and Bismuth by : P. J. Daly
Download or read book Direct Radiative Proton Capture Reactions in Cerium and Bismuth written by P. J. Daly and published by . This book was released on 1964 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of the Reaction Pt -> Alphagamma at Intermediate Energies by : Jose Thekkumthala
Download or read book An Experimental Study of the Reaction Pt -> Alphagamma at Intermediate Energies written by Jose Thekkumthala and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The experimental study of the radiative capture of protons by tritium was performed at proton energies of 227 MeV, 300 MeV and 375 MeV. A polarized beam was used and measurements were done at a number of angles. The cross section and the analyzing power of the reaction were obtained. The study of the reaction beyond meson production threshold enabled the Meson Exchange effects to be seen explicitly. These ME effects are implicitly included in the low energy region through electric dipole operators by means of the Siegert's Theorem. First order correction through Gauge invariance gives rise to the seagull term which shows up as a NNtty four-point vertex term. The other factors contributing to the cross-section are the A(1232) and short- range correlations generating from the high momentum transfer characteristic of the (p,y) process. Phenomenological models like the Distorted Wave Impulse Approximation (DWIA) are quite successful in describing the (p, y) process. DWIA is an extension of the Quasideuteron model introduced by Levinger. The interaction vertex is replaced by the experimentally known cross section of p+n -> dy. The additional factors coming into the expression for the cross section are a form factor which is the fourier transform of the overlap of the wavefunctions with respect to the momentum transfer, a spin factor and a kinematical factor. Another equally important motivation in studying the reaction was to check the validity of the Time Reversal Invariance (TRI) in the electromagnetic interaction of the hadrons. The principle of detailed balance relates the cross section for the forward reaction to that of the inverse reaction on the assumption of TRI. Comparison of the cross section values obtained in the present experiment with the inverse reaction data provided a check for the validity of TRI. Comparison of the results with the theoretical predictions by Gari and Heback revealed the significance of the A(1232) contribution. The DWIA calculation agrees with the results very well except at high energies and backward angles. This points towards the multi-step processes which become important at high energies and backward angles. Comparison of the data with the inverse reaction data reveals very good agreement between them, both in the magnitude of the cross sections and the shape of the angular distributions, confirming the validity of TRI in the electromagnetic interaction of the hadrons.
Book Synopsis High Resolution Measurement of Radiative Proton Capture and Pair Production at Intermediate Energies by : Bo Höistad
Download or read book High Resolution Measurement of Radiative Proton Capture and Pair Production at Intermediate Energies written by Bo Höistad and published by . This book was released on 1990 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1989-07 with total page 1314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nuclear Data for Science and Technology by : Syed M. Qaim
Download or read book Nuclear Data for Science and Technology written by Syed M. Qaim and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1041 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the Proceedings of the International Conference on Nuclear Data for Science and Technology held at Jillich in May 1991. The conference was in a series of application oriented nuclear data conferences organized in the past under the auspices of the Nuclear Energy Agency-Nuclear Data Committee (NEANDC) and with the support of the Nuclear Energy Agency-Committee on Reactor Physics (NEACRP). It was the fIrst international conference on nuclear data held in Germany, with the scientific responsibility entrusted to the Institute of Nuclear Chemistry of the Research Centre Jillich. The scientific programme was established by the International Programme Committee in consultation with the International Advisers, and the NEA and IAEA cooperated in the organization. A total of 328 persons from 37 countries and fIve international organizations participated. The scope of these Proceedings extends to a wide range of interdisciplinary topics dealing with measu rement, calculation, evaluation and application of nuclear data, with a major emphasis on numerical data. Both energy and non-energy related applications are considered and due attention is given to some fundamental aspects relevant to the understanding of nuclear data.
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 1980 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physics and Astrophysics of Ultra High Energy Cosmic Rays by : M. Lemoine
Download or read book Physics and Astrophysics of Ultra High Energy Cosmic Rays written by M. Lemoine and published by Springer Science & Business Media. This book was released on 2001-12-14 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International School on Physics and Astrophysics of Ultra High Energy Cosmic Rays (UHECR2000) was held at the Observatoire de Paris–Meudon on June 26-29, 2000. This was the ?rst international school speci?cally dedicated to ultra high energy cosmic rays. Its aim was to familiarize with and attract students, physicists and astronomers into this quickly developing newresearch ?eld. The mysterious and currently unknown origin of the most energetic par- cles observed in Nature has triggered in recent years theoretical speculations ranging from electromagnetic acceleration to as yet undiscovered physics - yond the Standard Model. It has also lead to the development of several new detection concepts and experimental projects, some of which are currently - der construction. By its nature, the ?eld of ultra high energy cosmic rays is therefore highly interdisciplinary and borrows from astrophysics and cosmology, via particle physics, to experimental physics and observational astronomy. One main aspect of the school was to emphasize and take advantage of this interd- ciplinarity. The lectures were grouped into subtopics and are reproduced in this volume in the following order: After a general introductory lecture on cosmic rays follow two contributions on experimental detection techniques, followed by three lectures on acceleration in astrophysical objects. The next four contri- tions cover all major aspects of propagation and interactions of ultra high energy radiation, including speculative issues such as newinteractions.
Book Synopsis Computational Chemistry by : David Young
Download or read book Computational Chemistry written by David Young and published by John Wiley & Sons. This book was released on 2004-04-07 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: A practical, easily accessible guide for bench-top chemists, thisbook focuses on accurately applying computational chemistrytechniques to everyday chemistry problems. Provides nonmathematical explanations of advanced topics incomputational chemistry. Focuses on when and how to apply different computationaltechniques. Addresses computational chemistry connections to biochemicalsystems and polymers. Provides a prioritized list of methods for attacking difficultcomputational chemistry problems, and compares advantages anddisadvantages of various approximation techniques. Describes how the choice of methods of software affectsrequirements for computer memory and processing time.
Book Synopsis Ni-Co 2021: The 5th International Symposium on Nickel and Cobalt by : Corby Anderson
Download or read book Ni-Co 2021: The 5th International Symposium on Nickel and Cobalt written by Corby Anderson and published by Springer Nature. This book was released on 2021-03-21 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this volume, operators, engineers, and researchers present information about all aspects of current processing technologies for nickel and cobalt, as well as emerging technologies for both metals. Contributions from industry and academia encompass metallurgical aspects of metals commonly associated with nickel and cobalt, such as copper and platinum group metals (PGMs). Specific focus areas of the collection include, but are not limited to mineral processing, metallurgy of nickel and cobalt ores, battery materials, recycling, recovery of associated byproducts and PGMs, and sulfide and laterite processing.
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