Placzek George (4 results)
Language: English
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Seller: S N Books World, Delhi, IndiaS N Books World
Contact seller5-star sellerLeatherBound. Condition: New. BOOKS ARE EXEMPT FROM IMPORT DUTIES AND TARIFFS; NO EXTRA CHARGES APPLY. Leatherbound edition. Condition: New. Leather Binding on Spine and Corners with Golden leaf printing on spine. Bound in genuine leather with Satin ribbon page markers and Spine with raised gilt bands. Pages: 226. A perfect gift… for your loved ones. Reprinted from 1959 edition. NO changes have been made to the original text. This is NOT a retyped or an ocr'd reprint. Illustrations, Index, if any, are included in black and white. Each page is checked manually before printing. As this print on demand book is reprinted from a very old book, there could be some missing or flawed pages, but we always try to make the book as complete as possible. Fold-outs, if any, are not part of the book. If the original book was published in multiple volumes then this reprint is of only one volume, not the whole set. IF YOU WISH TO ORDER PARTICULAR VOLUME OR ALL THE VOLUMES YOU CAN CONTACT US. Resized as per current standards. Sewing binding for longer life, where the book block is actually sewn (smythe sewn/section sewn) with thread before binding which results in a more durable type of binding. Language: English Pages: 226.
More imagesPublished by Macmillan, [London, 1939
Seller: SOPHIA RARE BOOKS, Koebenhavn V, DenmarkSOPHIA RARE BOOKS
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Add to basket'A FUNDAMENTAL THEORY OF NEUTRON-INDUCED NUCLEAR REACTIONS' (DSB). First edition, very rare offprint, of this sequel to the paper of Bohr & Kalckar, 'On the Transmutation of Atomic Nuclei by Impact of Material Particles', which had introduced the 'liquid-drop model' of the nucleus. "Bohr's 'droplet model' of nuclear reactions, r…efined in various ways since it was proposed in 1936, still holds as the adequate mode of description of one of the most important types of nuclear processes" (DSB). "In 1938 [Bohr] began a collaboration with Rudolph Peierls and George Placzek on an improved general treatment of nuclear reactions at higher energies (denser levels). Preliminary results were published in 1939 [in the offered paper]. Plans for a longer paper, interrupted by the war and taken up again thereafter, were never executed. 'Copies of some drafts circulated during [the war years] and as a result the paper was cited repeatedly in the literature, making it one of the most cited unpublished papers'" (Pais, Niels Bohr's Times, p. 341). In the present paper, the authors study the impact of neutrons of sufficiently high energy on medium and heavy nuclei, and the probability (or 'cross-section') for the temporary capture of a neutron by a nucleus. One of its most important contributions was to establish a quantum mechanical version of the 'optical theorem,' a general law relating the forward scattering amplitude to the cross section of the scatterer. "Using the optical theorem and Bohr's liquid-drop model of the nucleus, Placzek, Bohr, and Peierls offered a fundamental theory of neutron-induced nuclear reactions. These works proved essential to the subsequent development of nuclear theory and to development of nuclear reactor design" (DSB, under Placzek). Bohr, Peierls, and Placzek drafted and redrafted a detailed paper many times. In June 1939 Bohr wrote to Peierls that "'Placzek suggested it would be nice if a short account of the result could appear in Nature in the near future, and I shall bring with me a draft Placzek and I have written' . This draft, after minimal polishing, was published in the July 29, 1939 issue of Nature" (George Placzek: A Nuclear Physicist's Odyssey, p. 31). It carries the following footnote: "The details of this and of the other arguments of this note will be published in the Proceedings of the Copenhagen Academy." But in fact no detailed version of this paper ever appeared. No other copy listed on ABPC/RBH. Not on OCLC. In the present paper, the authors study the impact of neutrons of sufficiently high energy on medium and heavy nuclei, and the probability (or 'cross-section') for the temporary capture of a neutron by a nucleus. One of its most important contributions was to establish a quantum mechanical version of the 'optical theorem,' a general law relating the forward scattering amplitude to the cross section of the scatterer. In classical physics, the optical theorem was first derived by Lord Rayleigh in the context of scattering and absorption of light (he used it to explain why the sky is blue). In the present case it applies to the scattering of neutrons by heavy nuclei. It is of very general applicability as it depends only on conservation of energy (in the classical case) or conservation of probability (in the quantum mechanical case). The optical theorem is still often called the Bohr-Peierls-Placzek relation. The emergence of the optical theorem in the problem of quantum scattering came as an unexpected surprise. The optical theorem now appears in all advanced textbooks of quantum mechanics, although its authors, Bohr, Peierls, and Placzek, are rarely mentioned. In addition to the optical theorem, this paper also addresses a fundamental difficulty that occurs when one is concerned with the region of continuous energy. "The general theory of resonance processes [those which occur preferentially at or near particular impact energies], first derived by Breit and Wigner for the case of a single resonance level, was at first applied also to the case in which the width of the resonance levels is greater than their spacing, so that at any energy a number of levels contribute. On the other hand one can derive the cross section for the formation of a compound nucleus by the capture of a particle from the general theorem of detailed balancing in terms of the decay constant, i.e., the probability of escape of the same particle from the compound nucleus. As long as the levels do not overlap, the two methods give the same answer, but in the case of overlapping levels, they differ. This discrepancy had already been noticed by Kalckar, Oppenheimer and Serber, who concluded that the result obtained from the extension of the Breit-Wigner formula was the correct one . The conclusion of Bohr, Peierls and Placzek, summarized in [the present letter], was that, in fact, the answer from the detailed balancing argument was the right one. The failure of the other result was due to the fact that, in the case of overlapping levels, the state of the compound nucleus is not uniquely defined by its energy . "Bohr read a paper to the [Copenhagen] Academy on 21 October 1938, of which only an abstract is available, which describes this talk as "in connexion with the communication of a paper, written in collaboration with G. Placzek and R. Peierls". No such joint paper was available at the time, but perhaps Bohr reported in his talk the stage which the discussions and partial drafting of a paper had reached. The published abstract is not sufficiently detailed to indicate this. "The drafting of a paper, which was meant to be a sequel to the Bohr-Kalckar paper, had in fact been underway since the spring of 1938. The difficulties in trying to arrive at an agreed draft were mostly concerned with presentation, rather than substance. Peierls and Placzek were anxious to base the arguments on a complete theoretical foundation . Bohr found these calculations rather complicated and formal. He tried.
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Seller: Gyan Books Pvt. Ltd., Delhi, IndiaGyan Books Pvt. Ltd.
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Add to basketLeather Bound. Condition: New. Language: English. {Size: 19.68 x 24.13 cms} Presenting an Exquisite Leather-Bound Edition, expertly crafted with Original Natural Leather that gracefully adorns the spine and corners. The allure continues with Golden Leaf Printing that adds a touch of elegance, while Hand Embossing on the rounded…spine lends an artistic flair. This masterpiece has been meticulously reprinted in 2024, utilizing the invaluable guidance of the original edition published many years ago in 1959. The contents of this book are presented in classic black and white. Its durability is ensured through a meticulous sewing binding technique, enhancing its longevity. Imprinted on top-tier quality paper. A team of professionals has expertly processed each page, delicately preserving its content without alteration. Due to the vintage nature of these books, every page has been manually restored for legibility. However, in certain instances, occasional blurriness, missing segments, or faint black spots might persist. We sincerely hope for your understanding of the challenges we faced with these books. Recognizing their significance for readers seeking insight into our historical treasure, we've diligently restored and reissued them. Our intention is to offer this valuable resource once again. We eagerly await your feedback, hoping that you'll find it appealing and will generously share your thoughts and recommendations. Lang: - English, Pages:- 217, Print on Demand. If it is a multi-volume set, then it is only a single volume. We are specialised in Customisation of books, if you wish to opt different color leather binding, you may contact us. This service is chargeable. Product Disclaimer: Kindly be informed that, owing to the inherent nature of leather as a natural material, minor discolorations or textural variations may be perceptible. Explore the FOLIO EDITION (12x19 Inches): Available Upon Request. [Please Note - 91, 170, 171 ImageDestroyed] 217.
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Seller: Gyan Books Pvt. Ltd., Delhi, IndiaGyan Books Pvt. Ltd.
Contact seller5-star sellerCondition: New
US$ 85.92
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Add to basketFull Leather Bound. Condition: NEW. Language: English. {Size: 19.68 x 24.13 cms} A Unique Premium Leather-Bound book for elite readers/collectors of old rare books. An Original Leather is being used for binding this book with Golden Leaf Printing and designing on Spine, front and Back of the book with edge gilding. WE HAVE MULTI…PLE OPTIONS IN COLOR OF LEATHER RED, GREEN, BLUE, MAGENTA, TAN, PURPLE DEEP BROWN, BLACK AND WITH DIFFERENT COLOR LABELS. YOU MAY CHOOSE ANY COLOR OF YOUR CHOICE AND MAIL US. This service is chargeable. Original edition was published in [1959] and this unique edition is Reprinted in 2024 with the help of original edition. Black & white printing on high quality natural shade paper with sewing binding for longer life, professionally processed without changing its contents. As these are old books, we processed each page manually on computer and make them readable. We give our best to give you the best book but in some cases we have to adjust few pages which are blur or missing or black spots. If it is multi volume set, then it is only single volume. We hope that you understand these issues in these old treasure. This is an important book for the readers who want to know more about our old treasure. Our dedicated team is trying to bring these rare books back to the shelves. We are also giving service of printing the hard-to-find books which are not listed in our store. Hope you will like it and give your comments and suggestions. Lang: - English, Pages 217, Print on Demand. Product Disclaimer: Please be aware that because leather is a natural material, slight discoloration or change in texture may be visible. {FOLIO EDITION (Size 12x19 Inches) IS ALSO AVAILABLE ON REQUEST}. [Please Note - 91, 170, 171 ImageDestroyed] 217.
