Bulletin of the American Physical Society
2009 APS April Meeting
Volume 54, Number 4
Saturday–Tuesday, May 2–5, 2009; Denver, Colorado
Session H12: Mini-symposium on Nuclear Structure at Short Distances I |
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Sponsoring Units: DNP Chair: Ronald Gilman, Rutgers University Room: Plaza Court 2 |
Sunday, May 3, 2009 10:45AM - 11:21AM |
H12.00001: Short Range Correlations in Nuclei and Their Implications for the Structure of Dense Nuclear Matter Invited Speaker: Novel processes probing the decay of nucleus after removal of a nucleon with momentum larger than Fermi momentum by hard probes finally proved unambiguous evidence for long sought presence of short-range correlations~(SRCs) in nuclei. Analysis of these processes in combination with the analysis of the scaling properties of the ratios of the cross sections of large $Q^2$, A(e,e')X processes at $x>1$ allows us to conclude that (i) practically all nucleons with momenta $\ge$ 300 MeV/c belong to SRCs, consisting mostly of two nucleons, ii) probability of such SRCs in medium and heavy nuclei is $\sim 25\%$, iii) a fast removal of such nucleon practically always leads to emission of correlated nucleon with approximately opposite momentum, iv) proton removal from two-nucleon SRCs in 90\% of cases is accompanied by a removal of a neutron and only in 10\% by a removal of another proton. We explain that observed absolute probabilities and the isospin structure of two nucleon SRCs confirm the important role that tensor forces play in internucleon interactions. We find also that the presence of SRCs requires modifications of the Landau Fermi liquid approach to highly asymmetric nuclear matter and leads to a significantly faster cooling of cold neutron stars with neutrino cooling operational even for $N_p/N_n \le 0.1$. We also outline directions for future theoretical and experimental studies of the nucleonic and quark-gluon structure of two and three nucleon SRCs at high energy electron and hadron facilities. [Preview Abstract] |
Sunday, May 3, 2009 11:21AM - 11:33AM |
H12.00002: A New Theoretical Analysis of the Effects of Short Range Correlations in Inclusive Lepton Scattering Chiara Benedetta Mezzetti, Claudio Ciofi degli Atti Recently, evidence of short range correlations (SRC) has been provided by experimental data on inclusive lepton $A(e, e')X$ scattering by the observation of a scaling behavior of the ratios of the cross sections on heavy nuclei to those on the deuteron and $^3He$. Other attempts to get information on SRC rely on the concept of Y-scaling, whose interest has been renewed by new Jlab data. A new approach to Y-scaling, relying on the definition of a new relativistic scaling variable which incorporates the momentum dependence of the excitation energy of the $(A - 1)$ system is presented, with the resulting scaling function being closely related to the longitudinal momentum distributions. Taking into account final state interaction effects, the new analysis of experimental data on nuclei, ranging from $^3He$ to Nuclear Matter, provides unique information on the nucleon momentum distributions and confirms the analysis in terms of cross section ratios. [Preview Abstract] |
Sunday, May 3, 2009 11:33AM - 11:45AM |
H12.00003: Effects of Correlations in Medium and High Energy Scattering Off Nuclei Massimiliano Alvioli, Claudio Ciofi degli Atti, Leonid Kaptari, Hiko Morita The linked cluster expansion technique, introduced for the calculation of ground-state properties of nuclear systems, has been applied to the calculation of diagonal and non diagonal one- and two-body density matrices of nuclei ranging from $^{3}He$ to $^{208}Pb$. The results for few-body systems agree with Variational Monte Carlo results. Diagonal and non-diagonal density matrices appear in exclusive medium energy processes as $A(e,e'2N)X$ reactions, as well as correlation corrections in many high energy hadronic scattering processes, usually treated within the single-density approximation of Glauber theory. The realistic two-body densities have been used to calculate $(e,e'p)$ and $(e,e'pp)$ processes off few-nucleon systems and complex nuclei, the p-p and p-n momentum distributions in medium-weight nuclei, the total elastic, inelastic and quasi-elastic hadron-nucleus cross sections at high energies, finding relevant effects from short range and tensor correlations. [Preview Abstract] |
Sunday, May 3, 2009 11:45AM - 11:57AM |
H12.00004: Large acceptance detector for short-range correlation studies at 12 GeV JLab Stephen Wood, Eliezer Piasetzky Studies of short-range nucleon-nucleon correlations (SRCs) in nuclei are important for understanding the short-range and high-momentum properties of nuclear ground- and excited- state wave functions. SRCs also have far-reaching implications for modeling and understanding cold dense nuclear matter such as neutron stars. Recent experiments, utilizing the high resolving power of high-energy and large-momentum transfer reactions, have demonstrated the ability to identify and study SRC pairs in nuclei. We will present our proposal for the next generation of exclusive SRC studies: 1. Search for clusters of more than two correlated nucleons. 2. Search for non-nucleonic degrees of freedom in the SRC. These experimental studies are proposed for the upgraded 12 GeV JLab facility. For these measurements, we propose to design and construct a new unique large-acceptance detector facility (LAD). [Preview Abstract] |
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