Direct Population and Lifetime Measurements of the 21+ and 41+ States in 40Ca Using an Alpha-transfer Reaction PDF Download
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Author: Tongan Wu Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
At TRIUMF, Canada's particle accelerator centre, the TIGRESS Integrated Plunger (TIP) and its configurable detector systems have been used for charged-particle tagging and lightion identification in Doppler-shift lifetime measurements using gamma-ray spectroscopy with the TIGRESS array of HPGe detectors. An experiment using these devices to measure the lifetime of the 21+ and 41+ states of 40Ca has been performed by projecting an 36Ar beam onto a nat.C target. Analysis of the experimental gamma-ray spectra confirmed the direct population of these states. Kinematics of the reaction mechanism were identified using Monte-Carlo simulations, which also enabled the use of charged-particle correlations to select reactions that populated a specific excited state in the 40Ca immediately after its production. Selection of the 21+ state with this additional sensitivity further eliminated feeding cascades, and therefore restricted the decay kinetics predominantly to first order. Direct population of the 21+ state was achieved with a direct-population-to-feeding ratio of 21(±2) : 1. The 21+ lifetime that was measured in this experiment was 42 ± 5 fs, and the 41+ lifetime was 270 ± 10 fs. Both uncertainties quoted here are statistical only.
Author: Tongan Wu Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
At TRIUMF, Canada's particle accelerator centre, the TIGRESS Integrated Plunger (TIP) and its configurable detector systems have been used for charged-particle tagging and lightion identification in Doppler-shift lifetime measurements using gamma-ray spectroscopy with the TIGRESS array of HPGe detectors. An experiment using these devices to measure the lifetime of the 21+ and 41+ states of 40Ca has been performed by projecting an 36Ar beam onto a nat.C target. Analysis of the experimental gamma-ray spectra confirmed the direct population of these states. Kinematics of the reaction mechanism were identified using Monte-Carlo simulations, which also enabled the use of charged-particle correlations to select reactions that populated a specific excited state in the 40Ca immediately after its production. Selection of the 21+ state with this additional sensitivity further eliminated feeding cascades, and therefore restricted the decay kinetics predominantly to first order. Direct population of the 21+ state was achieved with a direct-population-to-feeding ratio of 21(±2) : 1. The 21+ lifetime that was measured in this experiment was 42 ± 5 fs, and the 41+ lifetime was 270 ± 10 fs. Both uncertainties quoted here are statistical only.
Author: Amritanshu Shukla Publisher: CRC Press ISBN: 1000172686 Category : Science Languages : en Pages : 417
Book Description
Nuclear structure Physics connects to some of our fundamental questions about the creation of universe and its basic constituents. At the same time, precise knowledge on the subject has lead to develop many important tools of human kind such as proton therapy, radioactive dating etc. This book contains chapters on some of the crucial and trending research topics in nuclear structure, including the nuclei lying on the extremes of spin, isospin and mass. A better theoretical understanding of these topics is important beyond the confines of the nuclear structure community. Additionally, the book will showcase the applicability and success of the different nuclear effective interaction parameters near the drip line, where hints for level reordering have already been seen, and where one can test the isospin-dependence of the interaction. The book offers comprehensive coverage of the most essential topics, including: • Nuclear Structure of Nuclei at or Near Drip-Lines • Synthesis challenges and properties of Superheavy nuclei • Nuclear Structure and Nuclear models - Ab-initio calculations, cluster models, Shell-model/DSM, RMF, Skyrme • Shell Closure, Magicity and other novel features of nuclei at extremes • Structure of Toroidal, Bubble Nuclei, halo and other exotic nuclei These topics are not only very interesting from theoretical nuclear physics perspective but are also quite complimentary for ongoing nuclear physics experimental program worldwide. It is hoped that the book chapters written by experienced and well known researchers/experts will be helpful for the master students, graduate students and researchers and serve as a standard & uptodate research reference book on the topics covered.
Author: Bogdan Povh Publisher: Springer Science & Business Media ISBN: 3662050234 Category : Science Languages : en Pages : 389
Book Description
The fourth edition includes new developments, in particular a new section on the double beta decay including a discussion of the possibility of a neutrinoless decay and its implications for the standard model.
Author: Alejandro Frank Publisher: Springer Nature ISBN: 3030219313 Category : Science Languages : en Pages : 220
Book Description
The revised edition of this established work presents an extended overview of recent applications of symmetry to the description of atomic nuclei, including a pedagogical introduction to symmetry concepts using simple examples. Following a historical overview of the applications of symmetry in nuclear physics, attention turns to more recent progress in the field. Special emphasis is placed on the introduction of neutron-proton and boson-fermion degrees of freedom. Their combination leads to a supersymmetric description of pairs and quartets of nuclei. Expanded and updated throughout, the book now features separate chapters on the nuclear shell model and the interacting boson model, the former including discussion of recent results on seniority in a single-j shell. Both theoretical aspects and experimental signatures of dynamical (super)symmetries are carefully discussed. This book focuses on nuclear structure physics, but its broad scope makes it suitable for final-year or post-graduate students and researchers interested in understanding the power and beauty of symmetry methods in physics. Review of the 1st Edition: "The subject of this book, symmetries in physical systems, with particular focus on atomic nuclei, is of the utmost importance in modern physical science. In contrast to most treatments, frequently characterized by fearsome formalism, this book leads the reader step-by-step, in an easily understandable way, through this fascinating field...this book is remarkably accessible to both theorists and experimentalists. Indeed, I view it as essential reading for experimental nuclear structure physicists. This is one of the finest volumes on this subject I have ever encountered." Prof. R.F. Casten, Yale University
Author: Mike Walker Publisher: John Wiley & Sons ISBN: 1118700090 Category : Science Languages : en Pages : 311
Book Description
This introductory textbook introduces the basics of dating, the range of techniques available and the strengths and limitations of each of the principal methods. Coverage includes: the concept of time in Quaternary Science and related fields the history of dating from lithostratigraphy and biostratigraphy the development and application of radiometric methods different methods in dating: radiometric dating, incremental dating, relative dating and age equivalence Presented in a clear and straightforward manner with the minimum of technical detail, this text is a great introduction for both students and practitioners in the Earth, Environmental and Archaeological Sciences. Praise from the reviews: "This book is a must for any Quaternary scientist." SOUTH AFRICAN GEOGRAPHICAL JOURNAL, September 2006 “...very well organized, clearly and straightforwardly written and provides a good overview on the wide field of Quaternary dating methods...” JOURNAL OF QUATERNARY SCIENCE, January 2007
Author: A. G. W. Cameron Publisher: Courier Corporation ISBN: 0486498557 Category : Science Languages : en Pages : 210
Book Description
Along with classic papers byFowler, Hoyle, and the Burbidges,this work stands as a key foundationin the development of nuclear astrophysics. Long out ofprint and very hard to find, this remarkable work has beenedited and re-typeset by an atomic expert. Now availablein an affordable paperback edition for the very first time,it addresses interrelated questions — What are stars? Howdoes the sun shine? Why is gold so rare, and Where did theelements come from? — that have puzzled observers fromtime immemorial.Edited and re-typeset reprint of the original Atomic Energy ofCanada, Ltd., 1957 edition.
Author: Tongan Wu
Author: Tongan Wu
Author: 
Author: 
Author: Amritanshu Shukla
Author: Yung-kuo Lim
Author: Bogdan Povh
Author: Alejandro Frank
Author: Argonne National Laboratory. Physics Division
Author: Mike Walker
Author: A. G. W. Cameron