scholarly journals Utility of antiproton-nucleus scattering for probing nuclear surface density distributions

2020 ◽  
Vol 102 (3) ◽  
Author(s):  
K. Makiguchi ◽  
W. Horiuchi ◽  
A. Kohama
Keyword(s):  
Surface Density ◽  
Nuclear Surface ◽  
Density Distributions ◽  
Nucleus Scattering

scholarly journals Multimodal Color Distributions in the Globular Cluster Systems of Giant Elliptical Galaxies

1999 ◽  
Vol 186 ◽  
pp. 197-197
Author(s):  
D. Geisler ◽  
M.G. Lee
Keyword(s):  
Globular Cluster ◽  
Surface Density ◽  
Cluster Formation ◽  
Elliptical Galaxies ◽  
Small Cluster ◽  
Cluster Systems ◽  
Density Distributions ◽  
Collapse Model

We report on new observations of the globular cluster systems (GCSs) of two galaxies: M86 (NGC 4406) in Virgo and NGC 4696, the central giant elliptical (gE) in the Centaurus cluster. Previous observations in M86 showed no evidence for bimodality, but using only (V - I) for small cluster samples. The NGC 4696 GCS is unstudied. We used the integrated Washington (C - T1) color. This metallicity index is more than twice as sensitive to [Fe/H] as (V - I). In M86 we have about 1100 good GC candidates, and about 650 in NGC 4696, with mean internal metallicity errors ~ 0.15 dex. Both of these GCSs are found to have bimodal metallicity distributions (MDs). Our data strengthen previous results that MDs for the GCSs of gEs are widespread. The evidence for 2 separate populations in these galaxies is corroborated by examining the surface density distributions: the metal-rich clusters are more centrally concentrated than their metal-poor counterparts. The overall radial metallicity gradient present in the M86 GCS is due to the varying radial mix of the 2 populations. The existence of 2 GC populations signifies that there were 2 distinct epochs or events of cluster formation in a gE. The simple collapse model of gE formation is ruled out.

scholarly journals Tiny grains shining bright in the gaps of Herbig Ae transitional discs

2019 ◽  
Vol 486 (3) ◽  
pp. 3721-3740 ◽  
Author(s):  
Eloise K Birchall ◽  
Michael J Ireland ◽  
Christoph Federrath ◽  
John D Monnier ◽  
Stefan Kraus ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Adaptive Optics ◽  
Surface Density ◽  
Forward Modelling ◽  
Point Spread Functions ◽  
Density Distributions ◽  
Disc Surface ◽  
Point Spread ◽  
Adaptive Optics Imaging ◽  
Modelling Approach

ABSTRACT This work presents a study of two Herbig Ae transitional discs, Oph IRS 48 and HD 169142; which both have reported rings in their dust density distributions. We use Keck-II/NIRC2 adaptive optics imaging observations in the L′ filter (3.8 $\mu$m) to probe the regions of these discs inwards of ${\sim }20\, \mathrm{au}$ from the star. We introduce our method for investigating these transitional discs, which takes a forward modelling approach: making a model of the disc (using the Monte Carlo radiative transfer code radmc3d), convolving it with point spread functions of calibrator stars, and comparing the convolved models with the observational data. The disc surface density parameters are explored with a Monte Carlo Markov Chain technique. Our analysis recovers emission from both of the discs interior to the well-known optically thick walls, modelled as a ring of emission at ${\sim }15\, \mathrm{au}$ in Oph IRS 48, and ${\sim }7\, \mathrm{au}$ for HD 169142, and identifies asymmetries in both discs. Given the brightness of the near-symmetric rings compared to the reported companion candidates, we suggest that the reported companion candidates can be interpreted as slightly asymmetric disc emission or illumination.

NUCLEAR SURFACE OSCILLATION MODEL IN HEAVY NUCLEI FISSION

1996 ◽  
Vol 05 (02) ◽  
pp. 365-383 ◽  
Author(s):  
VLADIMIR P. GARISTOV
Keyword(s):  
Experimental Data ◽  
Ground State ◽  
Fission Fragment ◽  
Spontaneous Fission ◽  
High Energy ◽  
Nuclear Surface ◽  
Surface Oscillation ◽  
Heavy Nuclei ◽  
Density Distributions ◽  
Energy Components

The fission of many heavy nuclei shows a bimodal character, with both low and high-energy components in the kinetic energy distribution. These two components are thought to arise because the nucleus can choose two different paths to scission from the ground state; either a path leading to elongated scission shapes and low fission fragment kinetic energies or a path leading to the compact scission configuration of two touching spheres and high fission fragment kinetic energies. In the present paper we consider the second path. The vibration of the fragment surfaces leads to more realistic density distributions of the fragments. We consider that the neck density is responsible for the asymmetry and odd-even effects. Our results are compared with a large amount of experimental data in the cases of spontaneous fission of U, Pu, and Cf isotopes.

scholarly journals Modeling the images of relativistic jets lensed by galaxies with different mass surface density distributions

2011 ◽  
Vol 37 (4) ◽  
pp. 233-247 ◽  
Author(s):  
T. I. Larchenkova ◽  
A. A. Lutovinov ◽  
N. S. Lyskova
Keyword(s):  
Surface Density ◽  
Relativistic Jets ◽  
Density Distributions

scholarly journals TESTING 6,8He DENSITY DISTRIBUTIONS BY CALCULATIONS OF TOTAL REACTION CROSS-SECTIONS OF 6,8He+28Si

2004 ◽  
Vol 13 (03) ◽  
pp. 573-583 ◽  
Author(s):  
V. K. LUKYANOV ◽  
E. V. ZEMLYANAYA ◽  
S. E. MASSEN ◽  
Ch. C. MOUSTAKIDIS ◽  
A. N. ANTONOV ◽  
...  
Keyword(s):  
Cross Sections ◽  
Reaction Cross ◽  
Scattering Data ◽  
Total Reaction ◽  
Density Distributions ◽  
Intermediate Energies ◽  
Limit Model ◽  
Optical Limit ◽  
Nucleus Scattering ◽  
Reaction Cross Sections

Calculations of the 6,8 He +28 Si total reaction cross-sections at intermediate energies are performed on the basis of the Glauber–Sitenko microscopic optical-limit model. The target-nucleus density distribution is taken from the electron-nucleus scattering data, and the 6,8 He densities are used as they are derived in different models. The results of the calculations are compared with existing experimental data. The effects of the density tails of the projectile nuclei as well as the role of shell admixtures and short-range correlations are analyzed.

EXOTIC NUCLEAR STRUCTURES OF LIGHT UNSTABLE NUCLEI VIA REACTION CROSS SECTION MEASUREMENT

2010 ◽  
Vol 25 (21n23) ◽  
pp. 2014-2015
Author(s):  
D. NISHIMURA ◽  
M. FUKUDA ◽  
M. TAKECHI ◽  
M. MIHARA ◽  
J. KOMURASAKI ◽  
...  
Keyword(s):  
Cross Sections ◽  
Reaction Cross ◽  
Neutron Density ◽  
Nuclear Surface ◽  
Transmission Method ◽  
Density Distributions ◽  
Unstable Nuclei ◽  
Glauber Theory ◽  
Nuclear Structures ◽  
Reaction Cross Sections

Reaction cross sections for 11 Be and 8 B on proton targets at 40A - 120A MeV have been measured by the transmission method. With these data, we can discuss the proton- and neutron- density distributions at the nuclear surface independently in principle using the Glauber theory. Our experimental results support that the constituent of halo in 11 Be is neutron dominantly and that of 8 B is proton dominantly.

scholarly journals ELASTIC PION-NUCLEUS SCATTERING FOR STUDIES OF THE NUCLEAR SURFACE.

1972 ◽  
Author(s):  
L.S. Kisslinger ◽  
R.L. Burman ◽  
J.H. Koch ◽  
M.M. Sternheim
Keyword(s):  
Nuclear Surface ◽  
Nucleus Scattering

scholarly journals Mass Distributions of Galaxies by Globular Cluster Systems

1988 ◽  
Vol 126 ◽  
pp. 639-640
Author(s):  
Kazutomo Takayanagi
Keyword(s):  
Globular Cluster ◽  
Surface Density ◽  
Spiral Galaxies ◽  
Cluster Systems ◽  
Mass Distributions ◽  
Density Distributions ◽  
Polytrope Index

Density curves of polytrope index 5 were fitted to the surface density distributions of 26 globular cluster systems. Though we have shown only two of them in Fig. 1, the remaining systems resemble the above cases. No differences exist between elliptical and spiral galaxies.

Sign in / Sign up

Export Citation Format

Share Document