Collinear Laser Spectroscopy of Neutron-rich Niobium PDF Download
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Author: Mareike Rüffer
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Languages : en
Pages : 0
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Book Description
Author: Mareike Rüffer
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
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Languages : en
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Hyperfine structure spectra and isotope shifts of the neutron-rich nuclei \(^{99}\)Nb, \(^{101}\)Nb, \(^{102}\)Nb and \(^{103}\)Nb were obtained at the IGISOL (Ion Guide Isotope Separator On-Line) facility at the accelerator laboratory of the University of Jyväskylä. The data were taken using collinear laser spectroscopy of bunched beams. Optical pumping from the ground state to populate metastable atomic states in the ion beam cooler allowed efficient spectroscopy of the ionic system that would otherwise be inaccessible due to a lack of suitable ground state resonance lines. The measurements of the hyperfine structure and the isotope shifts contribute valuable nuclear information to the understanding of the \(A\) ~ 100 region which displays a sudden onset of deformation that cannot be explained by the single particle shell model. It was possible to confirm the spin assignments for \(^{99}\)Nb, \(^{101}\)Nb and \(^{103}\)Nb as \(I\) = 9/2, \(I\) = 5/2 and \(I\) = 5/2 respectively. The extracted information on the mean square charge radii, \(\delta\bigr^2\big\), the magnetic dipole moments, \(\mu\), and the electric quadrupole moments, \(Q\), confirm a shape change of nuclei at \(N\) = 60 from soft and oblate (for \(N\)
Author: Mareike Rüffer
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ISBN:
Category :
Languages : en
Pages : 133
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Author: Allen Leary
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Languages : en
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"The neutron rich rubidium isotope chain up to N=61 is investigated using collinear fast-beam laser spectroscopy (CFBS) at the ISAC radioactive ion beam facility at TRIUMF. These measurements extend and update the comprehensive study of the rubidium isotopes chain undertaken by Thibault et al. Updated changes in mean square charge radii values across the chain are computed using the latest atomic factors for the rubidium D2 line and their trends with resect to nuclear deformation discussed. Equally the existence of a long lived isomeric state at N=61 is confirmed. A low spin state is assigned a spin of I=0 and a high spin state is tentatively assigned a spin of I=3 based on this analysis and gamma decay results. These measurements have been carried out in conjunction with the development of a laser frequency locking program and the characterization of the confocal Fabry Perot etalon employed by the CFBS group. This program guarantees the stability of the laser frequency to a dither of 2MHz during laser spectroscopy experiments, therefore reducing the errors associated to the measurements of hyperfine structure and isotope shift undertaken by the CFBS group." --
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Languages : en
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Collinear laser spectroscopy has been used as a tool for nuclear physics for more than 30 years. The unique possibility to extract nuclear properties like spins, radii and nuclear moments in a model-independent manner leads to important physics results to test the predictive power of existing nuclear models. rnThis work presents the construction and the commissioning of a new collinear laser spectroscopy experiment TRIGA-LASER as a part of the TRIGA-SPEC facility at the TRIGA research reactor at the University of Mainz. The goal of the experiment is to study the nuclear structure of radioactive isotopes which will be produced by neutron-induced fission near the reactor core and transported to an ion source by a gas jet system. rnThe versatility of the collinear laser spectroscopy technique will be exploited in the second part of this thesis. The nuclear spin and the magnetic moment of the neutron-deficient isotope Mg-21 will be presented, which were measured by the detection of the beta-decay asymmetry induced by nuclear polarization after optical pumping. A combination of this detection method with the classical fluorescence detection is then used to determine the isotope shifts of the neutron-rich magnesium isotopes from Mg-24 through Mg-32 to study the transition to the ''island of inversion''.
Author: Matthew Dominic Gardner
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Languages : en
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Author: Liss Vázquez Rodríguez
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Languages : en
Pages : 0
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The aim of this thesis is the study of nuclear structure properties of the neutron-rich Sn isotopes towards the N=82 shell closure and beyond by high-resolution collinear laser spectroscopy. The hyperfine structures and isotope shifts along 108−134Sn were measured using the COLLAPS instrumentation at ISOLDE, CERN. Two independent experiments using transitions with complementary properties, respectively at 452 and 286 nanometres studied the 5p6s 1P1 and the 5p6s 3P1 states in the neutral atom. The singlet state provided high sensitivity to quadrupole moments while the triplet facilitated a large magnetic splitting. From a self-consistent analysis of the two data sets, nuclear spins, electromagnetic moments and charge radii have been extracted. The properties of the long-lived isomers in 113Sn, 123Sn, 128Sn and the ground state of 133Sn and 134Sn have been assessed for the first time. The quadrupole moments of the 11/2− states, determined with much higher precision than in previous studies, have been found to follow a nearly linear trend. A "kink" in the radii trend at N=82 was observed for the first time. Beyond mean-field calculations provide an accurate description of the radii and further relate the overall trend to correlations stemming from the fluctuations of the quadrupole moments.
Author: Kara Marie Lynch
Publisher: Springer
ISBN: 3319071122
Category : Science
Languages : en
Pages : 140
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This work details an application of collinear resonance ionization spectroscopy for the separation of short-lived isomeric states and their subsequent study with decay spectroscopy. It reports the successful construction of a novel decay spectroscopy apparatus that can operate at pressures below 1 x 10^-9 mbar. The method is demonstrated by separating the nuclear ground and isomeric states of 204Fr and performing alpha-decay spectroscopy. An equivalent mass spectrometer would require 4.6 million times as much resolution to achieve the same result. This work unambiguously confirms the existence of a second isomeric state in 204Fr. The author also demonstrates the effectiveness of this method for laser spectroscopy and identification of hyperfine-structure components with energy tagging. This method was successfully used in 202Fr to identify ground and isomeric states. The measurement of 202Fr reported in this thesis demonstrates a factor of 100 improvement in sensitivity compared to state-of-the-art fluorescence techniques. The work reported in this thesis won the author the IOP Nuclear Physics Group Early Career Prize.
Author: Jürgen Eberth
Publisher: Springer Science & Business Media
ISBN: 364273958X
Category : Science
Languages : en
Pages : 427
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Results important for the general understanding of nuclear structure have emerged from the study of the nuclei in the mass region around the neutron-deficient and neutron-rich Zirconium isotopes. This research report gives the proceedings of a workshop which brought together about 70 experts in the area. Review papers deal with the theoretical interpretation of the unusual properties of these medium-mass nuclei, using the mean field approach, a microscopic description, the interacting boson model and particle rotor calculations. Papers also discuss experimental procedures for studying nuclei far from stability and the possibility of complete spectroscopy. The reviews are supplemented by short contributions presenting very new results. Phenomena discussed include the interplay between subshell effects and the strong proton-neutron interaction in determining nuclear shape, the coexistence of different nuclear shape and the occurrence of fast beta decay.
Author: Juha Äystö
Publisher: Springer Science & Business Media
ISBN: 9400755554
Category : Science
Languages : en
Pages : 390
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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.
