Download or read book Shape Transitions in Neutron rich Ru Isotopes written by and published by . This book was released on 2005 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spectroscopy of neutron-rich {sup 109,110,111,112}Ru nuclei was studied by measuring the prompt [gamma] rays originated from fission fragments, produced by the 238U([alpha], f) fusion-fission reaction, in coincidence with the detection of both fragments. For {sup 109,111}Ru, both the negative-parity (h112 orbitals) and positive-parity (g--2 and/or d52 orbitals) bands were extended to substantially higher spin and excitation energy than known previously. The ground-state and [gamma]-vibrational bands of {sup 110,112}Ru also were extended to higher spin, allowing observation of the second band crossing at the rotational frequency of H"50 keV in 112Ru, which is H"0 keV above the first band crossing. At a similar rotational frequency, the first band crossing for the h112 band in 111Ru was observed, which is absent in 1°9Ru. These band crossings most likely are caused by the alignment of the g92 proton pair. This early onset of the band crossing for the aligned [pi]g92 orbitals may be evidence of a triaxial shape transition from prolate to oblate occurring in 111Ru. The data together with a comparison of cranked shell model predictions are presented.
Download or read book Fission And Properties Of Neutron rich Nuclei Proceedings Of The Fifth International Conference On Icfn5 written by Joseph H Hamilton and published by World Scientific. This book was released on 2013-09-16 with total page 746 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings are the fifth in the series of International Conferences covering fission and properties of neutron-rich nuclei, which are at the forefront of nuclear research. The time interval of 5 years between each conference allows for significant new results to be achieved. Recently, world leaders in theory and experiments in research and the development of new facilities for research presented their latest results in areas such as synthesis of superheavy elements, new facilities for and recent results with radioactive ion beams, structure of neutron-rich nuclei, nuclear fission process, fission yields and nuclear astrophysics. This book is a major source of the latest research in these areas and plans for the future. The conference brought together a unique group of over 100 speakers including leaders from the major nuclear laboratories in Canada, China, France, Finland, Germany, Italy, Japan, Russia, Switerzland and the US along with leading research scientists from around the world.
Download or read book Shape Transition in Neutron Deficient Platinum Isotopes written by and published by . This book was released on 1988 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fission And Properties Of Neutron rich Nuclei Proceedings Of The Third International Conference written by Joseph H Hamilton and published by World Scientific. This book was released on 2003-10-16 with total page 859 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents more than 100 papers devoted to the understanding of fission processes and neutron-rich nuclei. All forms of fission, from spontaneous fission of 252Cf to high-energy fragmentation, are included. Together with studies on properties of neutron-rich nuclei and astrophysics, the book also features new experimental techniques, directions and the emerging new radioactive beam facilities.
Download or read book Fission and Properties of Neutron rich Nuclei written by Joseph H. Hamilton and published by World Scientific. This book was released on 2003 with total page 859 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting more than 100 papers devoted to the understanding of fission processes and neutron-rich nuclei, this book covers all forms of fission, from spontaneous fission of 252Cf to high-energy fragmentation. Together with studies on properties of neutron-rich nuclei and astrophysics, the book also features new experimental techniques, directions and the emerging new radioactive beam facilities.
Download or read book Fission And Properties Of Neutron rich Nuclei Proceedings Of The Fourth International Conference written by H K Carter and published by World Scientific. This book was released on 2008-08-08 with total page 769 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings are the fourth in the series of International Conferences covering fission and properties of neutron-rich nuclei, which are at the forefront of nuclear structure research. The time interval of 5 years between each conference allows for significant new results to be achieved. Recently, world leaders in theory and experiments in research and the development of new facilities for research presented their latest results in areas such as synthesis of superheavy elements, new facilities for and recent results with radioactive ion beams, structure of neutron-rich nuclei, nuclear fission process, fission yields and nuclear astrophysics. This book is a major source of the latest research in these areas and plans for the future. The conference brought together a unique group of over 100 speakers including the directors of the major nuclear laboratories in Canada, France, Germany, Japan, Russia and the US along with leading research scientists from around the world.
Download or read book IGISOL written by Juha Äystö and published by Springer Science & Business Media. This book was released on 2014-01-23 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: The IGISOL group at the University of Jyväskyla studies the properties of nuclei far off the line of beta stability. These studies are performed locally at the Jyväskylä Ion Guide Isotope Separator On-Line (IGISOL) facility, as well as at a number of other laboratories such as the ISOLDE facility in CERN, at GANIL and in Helmholzzentrum GSI, the location of the future radioactive beam facility FAIR. The group is also actively involved in work to support the development of international future facilities EURISOL and aforementioned FAIR. This book presents carefully selected papers to portrait the work at IGISOL. Previously published in the journals Hyperfine Interactions and European Physical Journal A.
Download or read book Fission And Properties Of Neutron rich Nuclei Proceedings Of The Sixth International Conference On Icfn6 written by Joseph H Hamilton and published by World Scientific. This book was released on 2017-09-28 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim and scope of the conference and book were to bring world leaders in the areas of fission, structure of neutron-rich nuclei, superheavy elements, astrophysics and new facilities for these research areas to present the latest developments in both theory and experiment to serve as benchmarks for future research.World leaders describe the latest research including development of new facilities under construction to point out the latest and future direction in research. These proceedings are published following the conferences every four to five years since 1997.
Download or read book Theoretical Study of Triaxial Shapes of Neutron rich Mo and Ru Nuclei written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, whether atomic nuclei can possess triaxial shapes at their ground states is still a subject of ongoing debate. According to theory, good prospects for low-spin triaxiality are in the neutron-rich Mo-Ru region. Recently, transition quadrupole moments in rotational bands of even-mass neutron-rich isotopes of molybdenum and ruthenium nuclei have been measured. The new data have provided a challenge for theoretical descriptions invoking stable triaxial deformations. The purpose of this study is to understand experimental data on rotational bands in the neutron-rich Mo-Ru region, we carried out theoretical analysis of moments of inertia, shapes, and transition quadrupole moments of neutron-rich even-even nuclei around 110Ru using self-consistent mean-field and shell model techniques. Methods: To describe yrast structures in Mo and Ru isotopes, we use nuclear density functional theory (DFT) with the optimized energy density functional UNEDF0. We also apply triaxial projected shell model (TPSM) to describe yrast and positive-parity, near-yrast band structures. As a result, our self-consistent DFT calculations predict triaxial ground-state deformations in 106,108Mo and 108,110,112Ru and reproduce the observed low-frequency behavior of moments of inertia. As the rotational frequency increases, a negative-gamma structure, associated with the aligned [nu](h11/2)2 pair, becomes energetically favored. The computed transition quadrupole moments vary with angular momentum, which reflects deformation changes with rotation; those variations are consistent with experiment. The TPSM calculations explain the observed band structures assuming stable triaxial shapes. Lastly, the structure of neutron-rich even-even nuclei around Ru-110 is consistent with triaxial shape deformations. Our DFT and TPSM frameworks provide a consistent and complementary description of experimental data.
Download or read book The 4th International Conference on Exotic Nuclei and Atomic Masses written by Carl J. Gross and published by Springer Science & Business Media. This book was released on 2007-12-10 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Conference on Exotic Nuclei and Atomic Masses (ENAM) has gained the status of the premier meeting for the physics of nuclei far from stability. The selected and refereed papers presenting the main results constitute valuable proceedings that offer everyone working in this field an authoritative and comprehensive source of reference.
Download or read book Shape and Structure of Neutron rich Nuclei from 252Cf Fission Fragments written by Jason Benjamin Snyder and published by . This book was released on 2014 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transition quadrupole moments, Qt, of rotational bands in the neutron-rich, even-mass 102-108Mo and 108-112Ru nuclei were measured with the Doppler-shift attenuation method. The nuclei were populated as fission fragments from 252Cf fission. The detector setup consisted of the Gammasphere spectrometer and the Hercules fast-plastic array. This allowed the measurement of asymmetric DSAM lineshapes at different Gammasphere detector angles with respect to the fission axis. The measurements typically covered the 6 to 16h spin range of the ground-state band and at least a strong transition in the [gamma] band. At moderate spin, the Qt moments are found to be reduced with respect to the values near the ground states, the latter being reported in the literature. An attempt has been made (by Afanasjev) to describe the data in the framework of cranked relativistic Hartree-Bogolyubov theory, and the results are reported in the present work as well as in a Physics Letters paper by Snyder et al. For 104Mo reliable predictions can be made. Here an oblate shape and a low-spin triaxial shape (deformation parameter [gamma]~-44°), predicted to be favored in other theoretical calculations, are ruled out by the data. There is some indication for a gradual change, at higher spin, from an initially prolate shape to a triaxial shape in 104Mo. The Qt data for 106Mo and 110,112Ru support this picture. The challenge of theory to describe the Qt data is addressed, which has to do with the very [gamma]-soft potential-energy surfaces. As a byproduct of the Qt analysis (which requires the determination of the intensities of the feeding transitions), the transition intensities of many weak high-spin or non-yrast states have been determined. These previously unknown intensity data are also reported. In the appendix, the results of an attenuation-coefficient analysis for [gamma]-ray angular distributions (due to recoil-in-vacuum) in heavy Ba isotopes are reported. These results are from a separate project, though from the same data set.
Download or read book International Conference on Nuclear Shapes and Nuclear Structure at Low Excitation Energies written by Michel Vergnes and published by Atlantica Séguier Frontières. This book was released on 1994 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shape Transitions at High Spin written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Changes of nuclear shapes at high spin have been observed in several transitional nuclei, including 153 154Dy and 186Hg. In the Dy isotopes a transition from collective to single-particle character appears at high spin suggesting a change from prolate to oblate shapes. In 186Hg, decoupled i132 quasiparticle bands with prolate and oblate shapes may have been observed in two crossing bands. The present discussion focusses on the polarizing effect of high-j rotation-aligned particles on the soft cores of these nuclei. Studies of the decay of the compound nucleus 156Er, produced at the rather low excitation energy of 46 MeV in the reaction 64Ni + 92Zr, are also reported. Measurements of neutron spectra as a function of .gamma.-sum energy and of the neutron multiplicity distribution have been performed. Comparison with the results of statistical model calculations suggests a suppression of neutron emission and it is speculated that this might be due to trapping in a superdeformed well.
Download or read book Journal of Research of the National Institute of Standards and Technology written by and published by . This book was released on 2000 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interacting Boson Model from Energy Density Functionals written by Kosuke Nomura and published by Springer Science & Business Media. This book was released on 2013-02-11 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a novel and robust way of deriving a Hamiltonian of the interacting boson model based on microscopic nuclear energy density functional theory. Based on the fact that the multi-nucleon induced surface deformation of finite nucleus can be simulated by effective boson degrees of freedom, observables in the intrinsic frame, obtained from self-consistent mean-field method with a microscopic energy density functional, are mapped onto the boson analog. Thereby, the excitation spectra and the transition rates for the relevant collective states having good symmetry quantum numbers are calculated by the subsequent diagonalization of the mapped boson Hamiltonian. Because the density functional approach gives an accurate global description of nuclear bulk properties, the interacting boson model is derived for various situations of nuclear shape phenomena, including those of the exotic nuclei investigated at rare-isotope beam facilities around the world. This work provides, for the first time, crucial pieces of information about how the interacting boson model is justified and derived from nucleon degrees of freedom in a comprehensive manner.
Download or read book The Nucleus written by F.D. Smit and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: The articles in this book cover a broad range of topics in the field of nuclear physics, including many articles on the subject of high spin physics. With an emphasis on the discussion and analysis of future developments within a number of significant areas, the book's attempt to address the status of research at the beginning of the next century is to be welcomed by researchers and students alike.
Download or read book 4th International Conference on Nuclei Far From Stability written by and published by . This book was released on 1981 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
