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Author : Thomas Christian Braunroth
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (14 download)
Download or read book Lifetime Measurements in Neutron-rich Isotopes Close to N written by Thomas Christian Braunroth and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mara Mikelah Grinder
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.8/5 (417 download)
Download or read book Lifetime Measurements of the Neutron-rich 36,38Si Isotopes written by Mara Mikelah Grinder and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The shell structure of nuclei far from stability evolves from the standard shell model picture that accurately describes stable nuclei. Experimental evidence has been given by changes in structural properties of nuclei such as the shell closures. The evolution of shell structure is gradual and must be studied by looking systematically at isotopic or isotonic nuclear chains. Studies of these chains can deepen the understanding of shell structures, magic numbers and the collective natures of nuclei far from stability.The neutron rich silicon isotopes display evidence of shell evolution seen in the ratio of the low-lying excitation energies. 34Si has a closed shell nature with a proton bubble structure which evolves along the isotopic chain to the absence of the N=28 shell closure expected in 42Si. Another complementary way to probe these changes is by studying the reduced transition rates of the first 2+ and 4+ states. The ratio of the reduced transition rates has characteristic values for different collective modes. However, these values are not known for isotopes that are more neutron rich than 30Si. The reduced transition rates can be compared to various theoretical models to understand the changes taking place in this neutron-rich region.This work discusses an experiment that studied 36Si and 38Si to determine the lifetimes of their excited states and to determine the reduced transition rates of the first 2+ and 4+ states in both nuclei. From these B(E2) values, the ratio is calculated and compared to the collective models and shell model calculations. The recoil distance measurement was conducted at the National Superconducting Cyclotron Laboratory using the S800 Spectrograph, the GRETINA array, and the TRIPLEX plunger. The experiment successfully measured the lifetimes of the 2+1 and 4+1 states in 38Si and the 4+1 and 6+1 states in 36Si. Results from the measurement included the confirmation of the 2383-keV state in 38Si that had only been seen once before. The B(E2) values determined from the experiment indicate the reduced collectivity for the first 4+ states of 36,38Si indicating the persistence of the N=20 magic number through 36Si and 38Si.
Author : Alfredo Estradé
Publisher :
ISBN 13 :
Total Pages : 394 pages
Book Rating : 4.3/5 (129 download)
Download or read book Time-of-flight Mass Measurements of Neutron Rich Isotopes at the NSCL written by Alfredo Estradé and published by . This book was released on 2010 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Pavlos Koseoglou
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (113 download)
Download or read book Lifetime Measurements in the Neutron-rich 148Ce Nuclide at the Low-Z Boundary of the N written by Pavlos Koseoglou and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Guillermo Fernández Martínez
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (19 download)
Download or read book Measurement of the Lifetimes of Excited States in Neutron-rich Ce Isotopes written by Guillermo Fernández Martínez and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Nuclear Structure of Neutron-rich Isotopes with Z from 38--42 written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this report results from a study of the nuclei produced in the spontaneous fission of[sup 248]Cm will be presented. The present paper will concentrate on recent results on neutron-rich Sr, Zr and Mo nuclei with N= 58--64. These isotopes are of particular interest because of the way their shapes change as a function of both proton and neutron number. The basic characteristics of these shape changes have been established for some time by[beta] decay studies of low-spin states. The new data on prompt[gamma] rays extend the knowledge of the behavior of these nuclei quite considerably. The great sensitivity of Ge arrays has lead to the observation of non-yrast bands, providing more detailed information on nuclear structure; the large number of detectors and the geometry of the CLOVER detectors incorporated into EUROGAM II have allowed the measurement of angular correlations and linear polarizations, putting spin and parity assignments on to a firm footing; a further advance in the study of fission fragment spectroscopy is the determination of the lifetimes of yrast states by a new Doppler attenuation technique. These lifetime measurements give new information on the way nuclear shapes change as a function of rotational frequency.
Author :
Publisher :
ISBN 13 :
Total Pages : 41 pages
Book Rating : 4.:/5 (925 download)
Download or read book Lifetimes in Neutron-rich Nd Isotopes Measured by Doppler Profile Method written by and published by . This book was released on 1995 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lifetimes of the rotational levels in neutron-rich even-even Nd isotopes were deduced from the analysis of the Doppler broadened line shapes. The experiment was performed at Daresbury with the Eurogam array, which at that time consisted of 45 Compton-suppressed Ge detectors and 5 Low-Energy Photon Spectrometers. The source was in the form of a 7-mm pellet which was prepared by mixing 5-mg; 248Cm and 65-mg KCl and pressing it under high pressure. Events for which three or more detectors fired were used to construct a cubic data array whose axes represented the [gamma]-ray energies and the contents of each channel the number of events with that particular combination of [gamma]-ray energies. From this cubic array, one-dimensional spectra were generated by placing gates on peaks on the other two axes. Gamma-ray spectra of even-even Nd isotopes were obtained by gating on the transitions in the complimentary Kr fragments. The gamma peaks de-exciting states with I ≥ 12 h were found to be broader than the instrumental line width due to the Doppler effect. The line shapes of they-ray peaks were fitted separately with a simple model for the feeding of the states and assuming a rotational band with constant intrinsic quadruple moment and these are shown in Fig. I-27. The quadrupole moments thus determined were found to be in good agreement with the quadrupole moments measured previously for lower spin states. Because of the success of this technique for the Nd isotopes, we intend to apply this technique to the new larger data set collected with the Eurogam II array. The results of this study were published.
Author : Michael Thoennessen
Publisher : Springer
ISBN 13 : 3319317636
Total Pages : 413 pages
Book Rating : 4.3/5 (193 download)
Download or read book The Discovery of Isotopes written by Michael Thoennessen and published by Springer. This book was released on 2016-06-02 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the exciting discovery of every isotope observed on earth to date, which currently numbers some 3000. The discoveries are arranged in chapters according to the observation techniques or production methods. Each chapter contains tables listing the first authors of the first publication as well as details about the production and detection methods used. At the end, a comprehensive table lists all isotopes sorted by elements. The book is based on individual paragraphs for each isotope, which were published over the last few years as separate articles in the journal “Atomic Data and Nuclear Data Tables”. The work re-evaluates all prior assignments judging them with a uniform set of criteria. In addition, the author includes over 100 new isotopes which have been discovered since the articles published. This book is a source of information for researchers as well as enthusiastic laymen alike. From the prepublication review: “The explanations focus on the essentials, which makes the various chapters pleasingly compact. The phrasing is well understandable also for non-experts. This makes the book easy to read, even thrilling. I have to confess that parts of the manuscript I was even reading as an evening lecture in the bed, so exciting was the history of isotope discoveries.” Sigurd Hofmann, Helmholtz Professor at GSI Darmstadt, Germany, and a leading expert in superheavy nuclei
Author : R. Neugart
Publisher : CRC Press
ISBN 13 : 9780750302623
Total Pages : 1056 pages
Book Rating : 4.3/5 (26 download)
Download or read book Nuclei Far From Stability and Atomic Masses and Fundamental Constants 1992. written by R. Neugart and published by CRC Press. This book was released on 1993-05-01 with total page 1056 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclei Far from Stability and Atomic Masses and Fundamental Constants 1992 presents a collection of 200 papers presented at two conferences that were held concurrently. Particular attention is paid to developments in the field of nuclear physics with energetic secondary beams and the increase of precision in the determination of atomic masses. Topics covered include nuclear spectroscopy and nuclear shapes, the heaviest elements, fission and cluster radioactivity, beta decay, coupling constants, neutrino mass, moments and radii, nuclei near the drip line and their structure, atomic masses, nuclear aspects in astrophysics, and experimental developments.
Author : Carme Rodríguez Tajes
Publisher : Univ Santiago de Compostela
ISBN 13 :
Total Pages : 160 pages
Book Rating : 4./5 ( download)
Download or read book Study of Light Neutron-Rich Nuclei Via One-Neutron Knockout Reactions. written by Carme Rodríguez Tajes and published by Univ Santiago de Compostela. This book was released on 2010 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309104084
Total Pages : 152 pages
Book Rating : 4.3/5 (91 download)
Download or read book Scientific Opportunities with a Rare-Isotope Facility in the United States written by National Research Council and published by National Academies Press. This book was released on 2007-05-09 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over ten years ago, U.S. nuclear scientists proposed construction of a new rare isotope accelerator in the United States, which would enable experiments to elucidate the important questions in nuclear physics. To help assess this proposal, DOE and NSF asked the NRC to define the science agenda for a next-generation U.S. Facility for Rare Isotope Beams (FRIB). As the study began, DOE announced a substantial reduction in the scope of this facility and put off its initial operation date by several years. The study focused on an evaluation of the science that could be accomplished on a facility reduced in scope. This report provides a discussion of the key science drivers for a FRIB, an assessment of existing domestic and international rare isotope beams, an assessment of the current U.S. position about the FRIB, and a set of findings and conclusions about the scientific and policy context for such a facility.
Author : Peter von Brentano
Publisher : World Scientific
ISBN 13 : 9810246544
Total Pages : 468 pages
Book Rating : 4.8/5 (12 download)
Download or read book International Symposium on Nuclear Structure Physics written by Peter von Brentano and published by World Scientific. This book was released on 2001 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear structure physics is undergoing a major revival, full of activities and excitement. On the experimental side, this is being made possible by advances in detector technology and accelerator capabilities that give access to data and nuclei (especially exotic nuclei far from stability) never before accessible. On the theoretical side, new concepts, ideas and computational techniques are advancing our understanding of effective interactions, nucleonic correlations, and symmetries of structure.This volume covers a broad range of topics on nuclear structure, including collective excitations, proton-neutron excitation modes, phase transitions, signatures of structure, isospin, structure at both high and low angular momenta, recent developments in nuclear theory, the vast new realm of exotic nuclei far from the valley of stability, and the latest technological advances of detectors and facilities which will lead this branch of physics into the future.
Author : Susan J Seestrom
Publisher : World Scientific
ISBN 13 : 9814571687
Total Pages : 193 pages
Book Rating : 4.8/5 (145 download)
Download or read book Next Generation Experiments To Measure The Neutron Lifetime - Proceedings Of The Workshop written by Susan J Seestrom and published by World Scientific. This book was released on 2014-03-28 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a great interest in improving the limits on neutron lifetime to the level of a precision of 0.1 s. The neutron lifetime is both an important fundamental quantity as well as a parameter influencing important processes such as nucleosynthesis (Helium production in the early universe) and the rate of energy production in the Sun.Aiming to create a roadmap of R&D for a next generation neutron lifetime experiment that can be endorsed by the North American neutron community, the focus of the workshop was on experiments using traps that utilize ultracold neutrons and confinement by a combination of magnetic and/or gravitational interaction in order to avoid systematic uncertainties introduced by neutron interactions with material walls. The papers in this volume summarize the limitations of present experiments, the discussion of new experiments in planning stage, and the discussion of systematic effects that must be addressed to achieve a lifetime measurement at an accuracy of 0.1 second.Cover image courtesy of Elena Fernández, Los Alamos National Laboratory.
Author :
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (931 download)
Download or read book Half-life Measurements for Neutron-rich Tc, Ru, Rh and Pd Isotopes written by and published by . This book was released on 1988 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yuri Erastovich Penionzhkevich
Publisher : World Scientific
ISBN 13 : 9811242992
Total Pages : 489 pages
Book Rating : 4.8/5 (112 download)
Download or read book Light Exotic Nuclei Near The Boundary Of Neutron Stability written by Yuri Erastovich Penionzhkevich and published by World Scientific. This book was released on 2021-09-23 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: The monograph describes the properties of the lightest nuclei with large excess of neutrons. The results of theoretical and experimental studies of neutron-rich isotopes with 1 ≤ Z ≤ 20 are presented while also changes in the structure of nuclei when going away from the line of β-stability are discussed. Information presented is on the mass, radii of distribution of nuclear matter, energy levels for excited states of these nuclei, the possibility of manifestation of a halo, as well as the deformation of nuclei and the quantum properties of ground states. The position of the boundary of nucleon stability for these nuclei is considered. The effects associated with weakening and even the disappearing influence of standard magic numbers and the appearance of new ones are discussed.The results presented in the book will be useful in other fields of science as well, including astrophysics.
Author : Giovanni G. Fazio
Publisher : World Scientific
ISBN 13 : 9789810247782
Total Pages : 430 pages
Book Rating : 4.2/5 (477 download)
Download or read book Nuclear Physics at Border Lines written by Giovanni G. Fazio and published by World Scientific. This book was released on 2002 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a collection of invited talks and oral contributions presented by the leading scientists in their fields, summarizing the most recent progress of, and new prospects for, nuclear physics research.It covers a broad range of the recent developments in nuclear physics: reactions between massive nuclei leading to superheavy element formation; radioactive beams and neutron-rich systems; exotic nuclei and nuclear astrophysics; new states of nuclear matter.
Author : Giovanni Fazio
Publisher : World Scientific
ISBN 13 : 9814489905
Total Pages : 421 pages
Book Rating : 4.8/5 (144 download)
Download or read book Nuclear Physics At Border Lines, Procs Of The Intl Conf written by Giovanni Fazio and published by World Scientific. This book was released on 2002-01-29 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a collection of invited talks and oral contributions presented by the leading scientists in their fields, summarizing the most recent progress of, and new prospects for, nuclear physics research.It covers a broad range of the recent developments in nuclear physics: reactions between massive nuclei leading to superheavy element formation; radioactive beams and neutron-rich systems; exotic nuclei and nuclear astrophysics; new states of nuclear matter.
