09 Jan

A Radio View of the Connection between GRBs and SNe

09 January 2008 - 1:30 PM
1400 Biomedical and Physical Sciences Building
Princeton University

Alicia Soderberg

05 Feb

Towards a microscopic calculation of optical potentials

05 February 2008 - 11:00 AM
2058 FRIB Laboratory
Lawrence Livermore National Laboratory

Ian Thompson

21 Feb

Journeys to and in Quantum Phase Space: Extended quantum phase-space formulations of quantum many-body theory and quantum information theory

21 February 2008 - 4:10 PM
1415 Biomedical and Physical Sciences Building
The University of Manchester

Raymond F. Bishop

25 Feb

Gas and Dust Layers from Cas A's Explosive Nucleosynthesis

25 February 2008 - 12:30 PM
1400 Biomedical and Physical Sciences Building
University of Minnesota

Lawrence Rudnik

Show/Hide Abstract
The Cassiopeia A supernova remnant is young, close and bright, allowing unprecedented views of the continuing evolution of the layers from its explosion. Our group has developed a new picture of this explosion using 5-40~micron images and spectra from the Spitzer Space Telescope. In this picture, two roughly spherical shocks (forward and reverse) were initially set up by the outer layers of the exploding star. Deeper layers were ejected in a highly flattened structure with large protrusions in the plane of the flattening; some of these are visible as jets. As these aspherical deeper layers encounter the reverse shock at different locations, they become visible across the electromagnetic spectrum, with different nucleosynthesis layers visible in different directions. In the infrared, we see the gas lines of Ar, Ne, O, Si, S, and Fe at different locations, along with higher ionization states of the same elements visible in the optical and X-ray parts of the spectrum. These different nucleosynthesis layers appear to have formed characteristic types of dust, the deep layers producing dust rich in silicates, while dust from the upper layers is dominated by Al$_2$O$_3$ and carbon grains. In addition, we see circumstellar dust heated by its encounter with the forward shock. We estimate the total dust mass currently visible that was formed in the explosion to be $\sim$0.02-0.05~M$_{\odot}$. Rough extrapolations of these measurements to SNe in high redshift galaxies may be able to account for the lower limit of their observed dust masses. There is a large amount of gas, and presumably dust, that has not yet encountered the reverse shock and is not visible in optical, X-ray, radio and most infrared emission, along with the cooled post-reverse-shock ejecta.
31 Mar

Laser Spectroscopy Experiments at GSI

31 March 2008 - 11:00 AM
2025 FRIB Laboratory

Christopher Geppert

01 Apr

Variational Theory of Nucleon Matter at Finite Temperature

01 April 2008 - 11:00 AM
2058 FRIB Laboratory
University of Illinois at Urbana-Champaign

Abhishek Mukherjee

Show/Hide Abstract
We have recently generalized the Variational Chain Summation method for calculating the equation of state of nucleon matter to finite temperature. After a brief introduction to the zero temperature method, I will discuss the problems associated with its extension to finite temperature and how they can be overcome. Finally I will present some results obtained for hot nucleon matter using this method.
07 Apr

When exceptions are the rule: matching theory and observations of thermonuclear bursts

07 April 2008 - 12:30 PM
1400 Biomedical and Physical Sciences Building
Monash University

Duncan Galloway

08 Apr

Relevance and Impact of the finite Range of the NN Interaction

08 April 2008 - 11:00 AM
2058 FRIB Laboratory
Ohio State University

Lucas Platter

22 Apr

Taming the odd-even mass staggering in nuclei

22 April 2008 - 11:00 AM
2058 FRIB Laboratory
Texas A&M Commerce

Carlos Bertulani

10 Jun

Coulomb Corrected Eikonal description of the breakup of halo nuclei

10 June 2008 - 11:00 AM
2058 FRIB Laboratory
Universite Libre de Bruxelles

Pierre Capel

17 Jun

Significance of Symplectic Symmetry in Ab Initio Many-nucleon Dynamics

17 June 2008 - 11:00 AM
2058 FRIB Laboratory
Louisiana State University

Kristina Sviratcheva

24 Jun

Four-body CDCC calculations: Application for 6He+target

24 June 2008 - 11:00 AM
2058 FRIB Laboratory
Universidade de Lisboa

Manuela Gallardo

05 Aug

Nuclear Structure around <sup>132</sup>Sn core: probable new features in semi-magic Sn isotopes

05 August 2008 - 11:00 AM
2058 FRIB Laboratory
Saha Institute of Nuclear Physics

Maitreyee Saha Sarkar

19 Aug

Does the passage of low energy deuterons through a finite <sup>12</sup>C foil lead to small angle tensor polarisation?

19 August 2008 - 11:00 AM
2058 FRIB Laboratory
University of Surrey

Elizabeth S. Cunningham

Show/Hide Abstract
A recent experiment conducted by A. Rouba et al., at Cologne University [1], indicates that a low energy beam of unpolarised deuterons passing through a carbon target, can become tensor polarised in the forward direction. They report a deviation from randomness of approximately 10 per cent. In order to understand this result we investigate the nuclear and atomic scattering of 11.9 MeV deuterons from a 12C target. We find that the Coulomb interaction between deuteron and the atomic electrons is dominant over nuclear effects and calculate the tensor polarisation to be three orders of magnitude below the experimental value. If the experimental result is confirmed we are left with a major discrepancy between theory and experiment. {1} A. Rouba et al., Proc. 17th Int. Spin Physics Symp.; SPIN06, 2-7 Oct., Kyoto, Japan, AIP Conf. Proc. 915 (2007).
22 Sep

Elucidating the Properties of Dense Matter from Starquakes and r-Mode Oscillations

22 September 2008 - 12:30 PM
1400 Biomedical and Physical Sciences Building
Michigan State University

Andrew Steiner

06 Oct

The Evolution of Galaxies and Their Metals

06 October 2008 - 12:30 PM
1400 Biomedical and Physical Sciences Building
University of Notre Dame

Christopher Howk

Show/Hide Abstract
Understanding the production and distribution of metals in the universe is a major goal of modern astrophysics. While halo stars in our own Milky Way give one view of metal enrichment at early times, the gas in galaxies over a range of redshifts provides another probe of elemental production in galaxies with significantly different star formation histories than the Milky Way. I will describe some of our on-going work to study early nucleosynthesis in galaxies as well as the distribution of metals around galaxies. I will also describe a new approach to studying the primordial lithium abundance.
03 Nov

Towards a Measurement of the 30S(a,p)33Cl reaction rate in Type I X-Ray Bursts with rare isotope beams

03 November 2008 - 12:30 PM
1400 Biomedical and Physical Sciences Building

Catherine Deibel

04 Nov

Bayesian parameter estimation in effective field theories

04 November 2008 - 11:00 AM
2058 FRIB Laboratory
Ohio University

Matthias Schindler

Show/Hide Abstract
Estimation of low-energy constants (LECs) is an important component of effective field theory (EFT) programs. For low-energy QCD, a direct calculation of LECs from the underlying theory is possible in only a very few cases, and in practice the LECs are determined by fits to experimental data. There are several questions that need to be considered regarding such a fit: How does one incorporate the information that the LECs are of natural size? At which order in the EFT expansion should the fit be performed? And which data should be used to determine the LECs? We propose a method to address these questions that is based on Bayesian probability theory. The Bayesian framework not only allows for a more stable extraction of parameters from data, but also for a more systematic treatment of uncertainties. To demonstrate our method we present the application to a "toy" problem, as well as a problem in chiral perturbation theory.
11 Nov

Recent Developments in nucleon-nucleon potentials

11 November 2008 - 11:00 AM
2058 FRIB Laboratory
Iowa State University

Alina Negoita

17 Nov

The Trojan Horse Method: a tool for nuclear astrophysics

17 November 2008 - 12:30 PM
1400 Biomedical and Physical Sciences Building
University of Sao Paulo, Brazil

Marcelo Gimenez Del Santo

18 Nov

Microscopic approaches to electro-weak reactions

18 November 2008 - 11:00 AM
2058 FRIB Laboratory

Sonia Bacca