Download or read book Status of the Argonne Notre Dame BGO Gamma ray Facility at ATLAS written by and published by . This book was released on 1995 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The gamma-ray facility at ATLAS consists of (a) a 4[pi] gamma-sum/multiplicity spectrometer with 50 BGO hexagonal elements (inner array) and (b) 12 Compton-suppressed germanium detectors (CSG) external to the inner array. During the past year the effort related to this facility continued on several fronts. Because of neutron damage, annealing was performed on eight Ge detectors. Three of these were annealed twice. The performance of the detectors was recovered in all but one case. In the latter, the FET was lost and the detector was returned to the manufacturer for repair. Maintenance and repairs had to be performed on several electronics modules and, in particular, on some of the CAMAC units. None of these problems affected an experiment for more than a couple of hours. Preventive maintenance was performed on the LN2 filling system (inspection of all filling lines and check of the various functions of the control modules). 10 of the CSGs were moved to the FMA for long periods of time on three different occasions and were used in conjunction with this device. Such a move takes about 1 day, does not require that the Ge detectors be warmed up, and has not resulted in any noticeable loss in performance of the CSGs. A new dedicated target chamber was designed and constructed. This chamber allows us to place a target upstream from the usual location, outside of the array. In this way it is possible to study decays from isomers after recoil from the target into a stopper located at the focus of the [gamma]-ray facility.
Download or read book Physics Division Annual Report written by Argonne National Laboratory. Physics Division and published by . This book was released on 1995 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Physics written by and published by . This book was released on 1995 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several groups from the University of Notre Dame are playing an important role in developing the research program at ATLAS. One of their main interests is the study, in collaboration with ANL staff members, of the behavior of nuclei at high spin in the transitional region near A=180 (i.e. the Hg-Pt-Os nuclei), and A=100 (i.e. the Ru-Tc nuclei) with emphasis on shape coexistence and configuration mixing. This group has also participated in many other experiments performed with the BGO gamma-ray facility, especially in the investigation of superdeformation. The [gamma]-ray groups at ANL and Notre Dame have also had collaborative experiments at Gammasphere. The Notre Dame group has built, tested and extensively used a state-of-the-art plunger device for lifetime measurements in conjunction with the ATLAS [gamma]-ray facility. An adapted version of this device is now under construction at Notre Dame, under contract with ANL, for use at the Gammasphere facility.
Download or read book INIS Atomindex written by and published by . This book was released on 1996 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report to Users of ATLAS Argonne Tandem Line Accelerator System written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The operation and development of ATLAS are reported, including accelerator improvements. Particularly noted is an upgrade to extend the mass range of projectiles up to uranium and to increase the beam intensity by at least two orders of magnitude for all ions. Meetings are discussed, particularly of the Program Advisory Committee and the User Group Executive Committee. Some basic information is provided for users planning to run experiments at ATLAS, including a table of beams available. The data acquisition system for ATLAS, DAPHNE, is discussed, as are the following experimental facilities: the Argonne-Notre Dame Gamma Ray Facility, a proposal submitted for constructing a large-acceptance Fragment Mass Analyzer. Brief summaries are provided of some recent experiments for which data analysis is complete. Experiments performed during the period from June 1, 1986 to January 31, 1987 are tabulated, providing the experiment number, scientists, institution, experiment name, number of days, beam, and energy. (LEW).
Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 1550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for the Two phonon Octupole Vibrational State in sup 208 Pb written by and published by . This book was released on 1995 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: We performed an experiment to search for the two-phonon octupole vibrational state in 2°8Pb. Thick targets of 2°8Pb, 2°9Bi, {sup 58,64}Ni, and 16°Gd were bombarded with 1305 MeV beams of were bombard 2°8Pb supplied by ATLAS. Gamma rays were detected using the Argonne-Notre Dame BGO gamma-ray facility, consisting of 12 Compton-suppressed germanium detectors surrounding an array of 50 BGO scintillators. We identified some 30 known gamma rays from 2°8Pb in the spectra gated by the 5− 2!3− and 3− 2!0 transitions in 2°8Pb. In addition, after unfolding these spectra for Compton response, we observed broad coincident structures in the energy region expected for the 2-phonon states. Furthermore, we confirmed the placement of a 2485 keV line observed previously in 2°7Pb and find no evidence consistent with the placement of this line in 2°8Pb. We are currently in the process of investigating the origin of the broadened lines observed in the spectra, extracting the excitation probability of states in 2°8Pb, and determining the relative probability of mutual excitation and neutron transfer in this reaction. An additional experiment is also being performed to collect much higher statistics germanium-germanium coincidence data for the thick 2°8Pb target.
Download or read book Physics Division Annual Report written by Argonne National Laboratory. Physics Division and published by . This book was released on 2001 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Production of Actinide Nuclei by Multi nucleon Transfer written by and published by . This book was released on 1995 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-nucleon transfers have increasingly allowed us to reach parts of the nuclear chart where regular compound nuclear reactions are prohibited. The interesting region of Ra and Rn, where a rich tapestry of nuclear structure manifests itself, is now accessible using this technique of deep inelastic scattering. In particular, these nuclei are predicted to lie at the onset of octupole deformation and the region is rich in examples of shape coexistence. There are several theoretical predictions of nuclear structure of these nuclei that have not been experimentally tested. Moreover, there is serious disagreement among these theories. We used a beam of 136Xe at 720 MeV from ATLAS on a target of 232Th to produce a range of Rn isotopes, with a mass from 220 to 224, and Ra isotopes with masses greater than 222. The beam energy, target and beam were selected carefully to enhance the cross-section for production of these nuclei and reduce the Doppler broadening of the gamma rays that were observed in the Argonne Notre Dame gamma-ray facility. The 12 germanium detectors of this array allowed the observation of gamma-gamma coincidences. The inner ball of 50 BGO detectors allowed us to record the multiplicity and sum-energy information for each event. The latter should permit us to determine the entry region in the products of the transfer reaction. We had four successful days of beam-time, when we collected in excess of 8 x 107 events. Data analysis is in progress at the University of Liverpool. A complete set of spectroscopic information on the yrast structure of the many nuclei produced in this reaction is being extracted.
Download or read book Nuclei at the Limits written by Dariusz Seweryniak and published by American Institute of Physics. This book was released on 2005-04-20 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: All papers were peer reviewed. The Conference on Nuclei at the Limits covered most of the current experimental and theoretical research in the structure of nuclei. The emphasis was on: nuclei at the limits of their existence in spin, excitation energy, charge and proton-number; neutron-rich nuclei; and the implications of nuclear structure for astrophysics.
Download or read book Fission And Properties Of Neutron rich Nuclei Proceedings Of The Second International Conference written by H K Carter and published by World Scientific. This book was released on 2000-03-24 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Second International Conference on Fission and Properties of Neutron-Rich Nuclei continued the emphasis on fission models, fission processes, properties of neutron-rich nuclei and new directions. The responses to the conference were so extensive that 44 talks were presented in individual sessions and 35 more in two afternoons of parallel sessions. New insights and developments were discussed, including experimental and theoretical studies of ternary fission with correlated pairs with emission of a third nucleus such as helium-3, alpha particle, and beryllium-10; the structure of neutron-rich nuclei from spontaneous fission, heavy-ion-induced fission and knock-out reactions; comparisons of deep inelastic reactions and fission for production of neutron-rich nuclei; production of superheavy elements, including the discovery of element 114; experiments with radioactive beams; and proposals for new radioactive ion beam facilities.
Download or read book Building Blocks Of Nuclear Structure The 4th International Spring Seminar On Nuclear Physics written by Aldo Covello and published by World Scientific. This book was released on 1993-05-31 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Held in May 1992 in Italy, the 4th International Spring Seminar on Nuclear Physics focused on recent developments which enhanced our understanding of the role of the various degrees of freedom which come into play in the nucleus. Consisting of four sessions, the first three sessions dealt with both theoretical and experimental issues centering on quarks and meson degrees of freedom, single-particle degrees of freedom and collective degrees of freedom. The fourth session discussed several important contributions that nuclear structure physics has made to the other research fields.
Download or read book Physics Briefs written by and published by . This book was released on 1991 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Nucleus written by F.D. Smit and published by Springer Science & Business Media. This book was released on 1999 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the International Conference on The Nucleus: New Physics for the New Millennium, held January 18-22, 1999, at the National Accelerator Centre, Faure, South Africa
Download or read book Nuclear Physics written by National Research Council and published by National Academies Press. This book was released on 2013-02-25 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: The principal goals of the study were to articulate the scientific rationale and objectives of the field and then to take a long-term strategic view of U.S. nuclear science in the global context for setting future directions for the field. Nuclear Physics: Exploring the Heart of Matter provides a long-term assessment of an outlook for nuclear physics. The first phase of the report articulates the scientific rationale and objectives of the field, while the second phase provides a global context for the field and its long-term priorities and proposes a framework for progress through 2020 and beyond. In the second phase of the study, also developing a framework for progress through 2020 and beyond, the committee carefully considered the balance between universities and government facilities in terms of research and workforce development and the role of international collaborations in leveraging future investments. Nuclear physics today is a diverse field, encompassing research that spans dimensions from a tiny fraction of the volume of the individual particles (neutrons and protons) in the atomic nucleus to the enormous scales of astrophysical objects in the cosmos. Nuclear Physics: Exploring the Heart of Matter explains the research objectives, which include the desire not only to better understand the nature of matter interacting at the nuclear level, but also to describe the state of the universe that existed at the big bang. This report explains how the universe can now be studied in the most advanced colliding-beam accelerators, where strong forces are the dominant interactions, as well as the nature of neutrinos.
Download or read book Progress in Particle and Nuclear Physics written by and published by . This book was released on 1978 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radionuclides in the Environment written by David A. Atwood and published by John Wiley & Sons. This book was released on 2013-02-19 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear energy is the one energy source that could meet the world's growing energy needs and provide a smooth transition from fossil fuels to renewable energy in the coming decades and centuries. It is becoming abundantly clear that an increase in nuclear energy capacity will, and probably must, take place. However, nuclear energy and the use of radionuclides for civilian and military purposes lead to extremely long-lived waste that is costly and highly problematic to deal with. Therefore, it is critically important ot understand the environmental implications of radionuclides for ecosystems and human health if nuclear energy is to be used to avoid the impending global energy crisis. The present volume of the EIC Books series addresses this critical need by providing fundamental information on environmentally significant radionuclides. The content of this book was developed in collaboration with many of the authors of the chapters. Given the enormity of the subject the Editor and the Authors had to be judicious in selecting the chapters that would appropriately encompass and describe the primary topics, particularly those that are of importance to the health of ecosystems and humans. The resulting chapters were chosen to provide this information in a book of useful and appropriate length. Each chapter provides fundamental information on the chemistry of the radionuclides, their occurrence and movement in the enivornment, separation and analyses, and the technologies needed for their remediation and mitigation. The chapters are structured with a common, systematic format in order to facilitate comparions between elements and groups of elements. About EIC Books The Encyclopedia of Inorganic Chemistry (EIC) has proved to be one of the defining standards in inorganic chemistry, and most chemistry libraries around the world have access either to the first of second print editon, or to the online version. Many readers, however, prefer to have more concise thematic volumes, targeted to their specific area of interest. This feedback from EIC readers has encouraged the Editors to plan a series of EIC Books, focusing on topics of current interest. They will appear on a regular basis, and will feature leading scholars in their fields. Like the Encyclopedia, EIC Books aims to provide both the starting research student and the confirmed research worker with a critical distillation of the leading concepts in inorganic and bioinorganic chemistry, and provide a structured entry into the fields covered. This volume is also available as part of Encyclopedia of Inorganic Chemistry, 5 Volume Set. This set combines all volumes published as EIC Books from 2007 to 2010, representing areas of key developments in the field of inorganic chemistry published in the Encyclopedia of Inorganic Chemistry. Find out more.
