Related Techniques for the Determination of Nuclear Structure

1984 ◽  
pp. 73-82
Author(s):  
W. H. King
Keyword(s):  
Nuclear Structure

Determination of the magnetic and nuclear structure of Ni _{2.17} Mn _{0.83} Ga

2005 ◽  
Vol 21 (3-4) ◽  
pp. 159-162 ◽  
Author(s):  
K. Fröhlich ◽  
B. Dennis ◽  
T. Kanomata ◽  
M. Matsumoto ◽  
K.-U. Neumann ◽  
...  
Keyword(s):  
Nuclear Structure

Precise ground state properties of the heaviest elements for studies of their atomic and nuclear structure

2019 ◽  
Vol 107 (7) ◽  
pp. 603-613 ◽  
Author(s):  
Michael Block
Keyword(s):  
Nuclear Structure ◽  
Ion Trap ◽  
Precise Determination ◽  
Nuclear Spectroscopy ◽  
Future Perspectives ◽  
Nuclear Spins ◽  
Charge Radii ◽  
Exotic Nuclides ◽  
Heaviest Elements

Abstract The precise determination of atomic and nuclear properties such as masses, differential charge radii, nuclear spins and electromagnetic moments of exotic nuclides has recently been extended to the region of the heaviest elements. To this end, ion trap-based techniques and laser spectroscopy methods have been employed to provide information complementary to that obtained by nuclear spectroscopy. This enables more detailed studies of the atomic and nuclear structure of these exotic nuclides far from stability. This contribution summarizes some of the recent achievements and addresses future perspectives for measurements on even heavier elements.

scholarly journals Nuclear structure: determination of the fate of the nuclear envelope in Drosophila during mitosis using monoclonal antibodies

1983 ◽  
Vol 64 (1) ◽  
pp. 331-349 ◽  
Author(s):  
J.P. Fuchs ◽  
H. Giloh ◽  
C.H. Kuo ◽  
H. Saumweber ◽  
J. Sedat
Keyword(s):  
Nuclear Envelope ◽  
Nuclear Structure ◽  
Structure And Function ◽  
Nuclear Proteins ◽  
Longitudinal Gradient ◽  
Indirect Immunofluorescence Staining ◽  
Nuclear Events ◽  
And Function ◽  
Drosophila Embryos

Libraries of monoclonal antibody against nuclear proteins of Drosophila melanogaster have been established recently to investigate nuclear structure and function. Some of the antibodies have been characterized as being directed against the nuclear envelope. Further studies detailed in this paper describe the fate of the nuclear envelope during mitosis. Indirect immunofluorescence staining of whole developing Drosophila embryos has been used as a system in which nuclear events can be studied both synchronously and in a longitudinal gradient of mitotic structures. The results show a pattern of breakdown and reconstruction of the nuclear envelope in which the antigen is always present in particulate structures. In addition, the processes of antigen rearrangement are shown to be spatially determined throughout mitosis.

Determination of the nuclear structure and spin density distribution in the cyano-bridged molecular based magnet K2Mn3(H2O)6[Mo(CN)7]2·6 H2O

2001 ◽  
Vol 4 (2) ◽  
pp. 105-112 ◽  
Author(s):  
John A Stride ◽  
Béatrice Gillon ◽  
Arsene Goukassov ◽  
Joulia Larionova ◽  
Rodolphe Clérac ◽  
...  
Keyword(s):  
Density Distribution ◽  
Nuclear Structure ◽  
Spin Density ◽  
Spin Density Distribution

scholarly journals What can we learn from (n,xnγ) cross sections about reaction mechanism and nuclear structure?

2020 ◽  
Vol 239 ◽  
pp. 01023
Author(s):  
Maëlle Kerveno ◽  
Marc Dupuis ◽  
Catalin Borcea ◽  
Marian Boromiza ◽  
Roberto Capote ◽  
...  
Keyword(s):  
Nuclear Structure ◽  
Cross Section ◽  
Cross Sections ◽  
Level Density ◽  
Total N ◽  
Fission Process ◽  
Stringent Test ◽  
High Level ◽  
Scattering Cross Sections

Inelastic (n,n') cross section is a key quantity to accurately simulate reactor cores, and its precision was shown to need significant improvements. To bypass the experimental difficulties to detect neutrons from (n,xn) reaction and to discriminate inelastically scattered neutrons from those following the fission process in case of fissile targets, an indirect but yet powerful method is used: the prompt γ-ray spectroscopy. Along this line, our collaboration has developed the GRAPhEME setup, optimized for actinides, at the GELINA facility to measure partial (n,xn γ) cross sections, from which the total (n,xn) cross section can be inferred. (n,xn γ) experiments with actinides are still particularly challenging, as their structure presents a high level density at low energy, and the competing neutron-induced fission reaction contaminates the γ-energy distribution. New precise measurements of the partial (n,xn γ) cross sections provide a stringent test to theoretical model and offer a way to improve them. This is a path to a better determination of the total inelastic scattering cross sections. In this contribution we discuss modeling aspects of the 238U and 182W (n,n' γ) reactions, also measured with GRAPhEME, using the three codes TALYS, EMPIRE and CoH. We will highlight the needed/expected improvements on reaction modeling and nuclear structure input.

Theoretical studies in nuclear structure V. The matrix elements of non-central forces with an application to the 2 p -shell

1953 ◽  
Vol 218 (1134) ◽  
pp. 345-370 ◽  
Keyword(s):  
Nuclear Structure ◽  
Theoretical Studies ◽  
Spin Orbit ◽  
Matrix Elements ◽  
Fractional Parentage ◽  
The Matrix ◽  
Unfilled Shell ◽  
Closed Shells ◽  
Central Forces

Formulae are derived for the matrix elements of a non-central force in a configuration of N particles, involving fractional parentage coefficients for a reduction by two particles. The case when this configuration contains a number of closed shells and one unfilled shell is considered, although the methods used are applicable to less simple configurations. Specializing to the single 2 p -shell configurations (1 s ) 4 (2 p ) m for which the necessary coefficients have been derived, the matrices of central, tensor and two-body spin-orbit forces are given in terms of their two-particle elements. The determination of these two-particle elements is discussed and values are given for the 2 p -shell. Finally, the matrices derived are used in an attempt to derive the spins and moment data of certain 2 p -shell nuclei from a two-body charge symmetric interaction containing central, tensor and spin-orbit forces.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

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