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First Measurement Of Beta Decay Half Lives And Neutron Emission Probabilities In Several Isotopes Beyond N
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Book Synopsis First Measurement of Beta-decay Half-lives and Neutron Emission Probabilities in Several Isotopes Beyond N by : Roger Caballero Folch
Download or read book First Measurement of Beta-decay Half-lives and Neutron Emission Probabilities in Several Isotopes Beyond N written by Roger Caballero Folch and published by . This book was released on 2015 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: En aquest treball s'han determinat, experimentalment i per primera vegada, vides mitjanes i valors de probabilitat d'emissió de neutrons de diversos nuclis amb més de 126 neutrons. Per tal d'obtenir les dades es va realitzar un experiment a les instal·lacions del centre d'investigació d'ions pesats GSI a (Alemanya), combinat amb el separador de fragments FRS. El sistema de detecció d'ions i desintegracions beta va consistir d'un detector de partícules carregades anomenat SIMBA, que estava envoltat per una matriu de comptadors proporcionals d''He-3 que conformen el detector de neutrons BELEN. En total s'han determinat valors de vida mitjana de divuit isòtops d'or, mercuri, tal·li, plom i bismut, així com també la probabilitat d'emissió de neutrons (o llindars superiors) de set d'ells. Comparant els resultats amb les mesures de vides mitjanes anteriors en aquesta regió de nuclis s'observa un bon acord, reflectint la validesa de la sistemàtica de les dades existents. D''altra banda, fent la comparació amb els models teòrics, els resultats mostren un acord raonable per la meitat dels isòtops analitzats, i grans discrepàncies, de fins a un factor 10, per l'altra meitat. Pel que fa a les probabilitats d'emissió de neutrons mesurades, essent la primera mesura experimental a la regió per a diversos nuclis, no és possible comparar amb altres els valors obtinguts. La única comparació que es pot avaluar és amb les prediccions teòriques. En resum, els resultats són compatibles amb el model FRDM + QRPA, no obstant s'observen discrepàncies considerables en alguns isòtops de fins a un factor 5, com és el cas del valor obtingut per Tl-215, que correspon al nucli més exòtic del qual s''ha determinat la probabilitat d''emissió de neutrons.
Book Synopsis Beta-decay Half-lives and Beta-delayed Neutron Emisison Probabilities of Nuclei in the Region A. 110, Relevant for the R-process by :
Download or read book Beta-decay Half-lives and Beta-delayed Neutron Emisison Probabilities of Nuclei in the Region A. 110, Relevant for the R-process written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the [beta]-decay properties of A H" 110 r-process nuclei have been completed at the National Superconducting Cyclotron Laboratory, at Michigan State University. [beta]-decay half-lives for 1°5Y, {sup 106,107}Zr and {sup 108,111}Mo, along with, B-delayed neutron emission probabilities of 104Y, 109,11OMo and upper limits for 105Y, 103-107Zr and 108,111 Mo have been measured for the first time. Studies on the basis of the quasi-random phase approximation are used to analyze the ground-state deformation of these nuclei.
Book Synopsis Nuclear Shapes and Nuclear Structure at Low Excitation Energies by : Michel Vergnes
Download or read book Nuclear Shapes and Nuclear Structure at Low Excitation Energies written by Michel Vergnes and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a NATO ARW held in Cargese, France, June 3-7, 1991
Book Synopsis Beta-decay Half-lives of Neutron Rich Cu and Ni Isotopes Produced by Thermal Fission of 235U and 239Pu by :
Download or read book Beta-decay Half-lives of Neutron Rich Cu and Ni Isotopes Produced by Thermal Fission of 235U and 239Pu written by and published by . This book was released on 1989 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Beta-decay Studies of Neutron-rich Nuclides and the Possibility of an N by : Sean Nicholas Liddick
Download or read book Beta-decay Studies of Neutron-rich Nuclides and the Possibility of an N written by Sean Nicholas Liddick and published by . This book was released on 2004 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Beta-decay Half-lives of New Neutron-rich Chromium-to-nickel Isotopes and Their Consequences for the Astrophysical R-process by : U. Bosch
Download or read book Beta-decay Half-lives of New Neutron-rich Chromium-to-nickel Isotopes and Their Consequences for the Astrophysical R-process written by U. Bosch and published by . This book was released on 1985 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Free neutron beta-decay half-life by :
Download or read book Free neutron beta-decay half-life written by and published by . This book was released on 1971 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measuring the Half-life of O-26 by : Thomas Redpath
Download or read book Measuring the Half-life of O-26 written by Thomas Redpath and published by . This book was released on 2019 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: An interesting property of some neutron-unbound systems is true two-neutron emission where the neutrons are emitted simultaneously as opposed to a sequential decay through an intermediate state. Since neutrons are only affected by the angular momentum barrier, the timescale for this process is much shorter than for two proton emission which is dominated by the Coulomb barrier. One such case is 26O where a very low decay energy was measured and the two valence neutrons are expected to occupy d-wave orbitals. Also, the ground state of 25O is located 700 keV higher. Using the data from a previous measurement of the decay energy, the MoNA collaboration extracted a lifetime of 4:5+1:1 ±1:5(stat) ± 3(syst) ps with a confidence level of 82% (1). Results from a recent measurement give T1/2 = 5:0+2:0 1:6 (stat) ±1:7 (syst) ps and support the previous finding.Measurements of neutron-unbound systems using invariant mass spectroscopy are often performed using low-intensity radioactive ion beams. Low reaction yields can be countered by using a thicker target but at the expense of larger uncertainties in the reconstructed invariant mass. A new segmented target was designed to address this trade-off, and it was first used in this experiment to re-measure the ground state half-life of 26O.
Book Synopsis Particle Emission From Nuclei by : Dorin N. Poenaru
Download or read book Particle Emission From Nuclei written by Dorin N. Poenaru and published by CRC Press. This book was released on 2018-01-18 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has three volume. The first volume is mainly devoted to the macroscopic-microscopic theory in its traditional form and extended to very high mass and charge asymmetry. Applications of this theory to the emission of different kinds of charged particles from nuclei are presented in the second volume, where recent experimental achievements in alpha decay, proton, and heavy ion (14C, 24Ne, 28Mg, etc.) radioactivities are also discussed. Experiments on spontaneous fission, fission isomers, and more complex phenomena like particle-accompanied fission,delayed processes: p, a, 2p, t, n, 2n, 3n, and the new mechanism of cold fission (or fission with compact shapes) are described in detail in the third volume.
Author :National Academies of Sciences, Engineering, and Medicine Publisher :National Academies Press ISBN 13 :0309445310 Total Pages :264 pages Book Rating :4.3/5 (94 download)
Book Synopsis Molybdenum-99 for Medical Imaging by : National Academies of Sciences, Engineering, and Medicine
Download or read book Molybdenum-99 for Medical Imaging written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2016-11-28 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: The decay product of the medical isotope molybdenum-99 (Mo-99), technetium-99m (Tc-99m), and associated medical isotopes iodine-131 (I-131) and xenon-133 (Xe-133) are used worldwide for medical diagnostic imaging or therapy. The United States consumes about half of the world's supply of Mo-99, but there has been no domestic (i.e., U.S.-based) production of this isotope since the late 1980s. The United States imports Mo-99 for domestic use from Australia, Canada, Europe, and South Africa. Mo-99 and Tc-99m cannot be stockpiled for use because of their short half-lives. Consequently, they must be routinely produced and delivered to medical imaging centers. Almost all Mo-99 for medical use is produced by irradiating highly enriched uranium (HEU) targets in research reactors, several of which are over 50 years old and are approaching the end of their operating lives. Unanticipated and extended shutdowns of some of these old reactors have resulted in severe Mo-99 supply shortages in the United States and other countries. Some of these shortages have disrupted the delivery of medical care. Molybdenum-99 for Medical Imaging examines the production and utilization of Mo-99 and associated medical isotopes, and provides recommendations for medical use.
Book Synopsis Passive Nondestructive Assay of Nuclear Materials by : Doug Reilly
Download or read book Passive Nondestructive Assay of Nuclear Materials written by Doug Reilly and published by . This book was released on 1991 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Free Neutron Beta-decay Half-life by : C.J. Christensten
Download or read book Free Neutron Beta-decay Half-life written by C.J. Christensten and published by . This book was released on 1971 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 1020 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Radioactivity Analysis by : Michael F. L'Annunziata
Download or read book Handbook of Radioactivity Analysis written by Michael F. L'Annunziata and published by Elsevier. This book was released on 2012-12-02 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Radioactivity Analysis is written by experts in the measurement of radioactivity. The book describes the broad scope of analytical methods available and instructs the reader on how to select the proper technique. It is intended as a practical manual for research which requires the accurate measurement of radioactivity at all levels, from the low levels encountered in the environment to the high levels measured in radioisotope research. This book contains sample preparation procedures, recommendations on steps to follow, necessary calculations, computer controlled analysis, and high sample throughput techniques. Each chapter includes practical techniques for application to nuclear safety, nuclear safeguards, environmental analysis, weapons disarmament, and assays required for research in biomedicine and agriculture. The fundamentals of radioactivity properties, radionuclide decay, and methods of detection are included to provide the basis for a thorough understanding of the analytical procedures described in the book. Therefore, the Handbook can also be used as a teaching text. - Includes sample preparation techniques for matrices such as soil, air, plant, water, animal tissue, and surface swipes - Provides procedures and guidelines for the analysis of commonly encountered na
Book Synopsis Radiochemistry and Nuclear Chemistry by : Gregory Choppin
Download or read book Radiochemistry and Nuclear Chemistry written by Gregory Choppin and published by Butterworth-Heinemann. This book was released on 2002 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt: Origin of Nuclear Science; Nuclei, Isotopes and Isotope Separation; Nuclear Mass and Stability; Unstable Nuclei and Radioactive Decay; Radionuclides in Nature; Absorption of Nuclear Radiation; Radiation Effects on Matter; Detection and Measurement Techniques; Uses of Radioactive Tracers; Cosmic Radiation and Elementary Particles; Nuclear Structure; Energetics of Nuclear Reactions; Particle Accelerators; Mechanics and Models of Nuclear Reactions; Production of Radionuclides; The Transuranium Elements; Thermonuclear Reactions: the Beginning and the Future; Radiation Biology and Radiation Protection; Principles of Nuclear Power; Nuclear Power Reactors; Nuclear Fuel Cycle; Behavior of Radionuclides in the Environment; Appendices; Solvent Extraction Separations; Answers to Exercises; Isotope Chart; Periodic Table of the Elements; Quantities and Units; Fundamental Constants; Energy Conversion Factors; Element and Nuclide Index; Subject Index.
Download or read book Physics of Atomic Nuclei written by and published by . This book was released on 2000 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Health Risks of Radon and Other Internally Deposited Alpha-Emitters by : National Research Council
Download or read book Health Risks of Radon and Other Internally Deposited Alpha-Emitters written by National Research Council and published by National Academies Press. This book was released on 1988-02-01 with total page 623 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes hazards from radon progeny and other alpha-emitters that humans may inhale or ingest from their environment. In their analysis, the authors summarize in one document clinical and epidemiological evidence, the results of animal studies, research on alpha-particle damage at the cellular level, metabolic pathways for internal alpha-emitters, dosimetry and microdosimetry of radionuclides deposited in specific tissues, and the chemical toxicity of some low-specific-activity alpha-emitters. Techniques for estimating the risks to humans posed by radon and other internally deposited alpha-emitters are offered, along with a discussion of formulas, models, methods, and the level of uncertainty inherent in the risk estimates.
