121806959
Measurements of interaction cross sections for light neutron-rich nuclei at relativistic energies and determination of effective matter radii
Abstract We measured the interaction cross sections ( σ I ) of 10,11B, 12–20C, 14–23N, 16–24O and 18–26F on carbon targets at energies of around 950 A MeV. We then deduced the effective matter radii of the nuclei by a Glauber-model analysis. Based on the assumption of a core plus a valence neutron structure, we applied a Glauber-model analysis for a few-body system adapted for nuclei with an odd neutron number. We also deduced the effective nucleus-matter densities as well as some spectroscopic information for selected nuclei. Evidence for a one-neutron halo structure was found for 22N, 23O and 24F, as well as 19C.
66067913
Measurements of the interaction cross sections for Ar and Cl isotopes
We have measured the interaction cross sections ( σI ) of 31–40Ar and 31–37Cl on carbon targets at energies of around 950 A MeV. The effective matter radii for these nuclei were deduced by a Glauber-model analysis. Combining our matter radii with measured charge radii for Ar isotopes, we could deduce the proton-skin thicknesses for the 32–40Ar isotopes, which were found to increase monotonically with decreasing neutron number. The larger radius of the proton drip-line nucleus 31Ar suggests an anomalous structure for this nucleus. In addition, using NaI(Tl) arrays surrounding the carbon target, we measured γ -rays emitted from excited states in these isotopes. In this way we could deduce the upper limits for the inelastic cross sections ( σinela) on carbon targets at energies of around 950A MeV. * Corresponding author. E-mail address: ozawa@rarfaxp.riken.go.jp (A. Ozawa). 0375-9474/02/$ – see front matter  2002 Elsevier Science B.V. All rights reserved. PII: S0375-9474(02)01071-0 A. Ozawa et al. / Nuclear Physics A 709 (2002) 60–72 61  2002 Elsevier Science B.V. All rights reserved. PACS: 21.10.Gv; 25.60.Dz; 27.30.+t; 27.40.+z
14801318
Effective matter superpotentials from Wishart random matrices
Abstract We show how within the Dijkgraaf–Vafa prescription one can derive superpotentials for matter fields. The ingredients forming the nonperturbative Affleck–Dine–Seiberg superpotentials arise from constrained matrix integrals, which are equivalent to classical complex Wishart random matrices. The mechanism is similar to the way the Veneziano–Yankielowicz superpotential arises from the matrix model measure.
119245590
Correlation functions of three heavy operators — the AdS contribution
A bstractWe consider operators in $ \mathcal{N} = {4} $ SYM theory which are dual, at strong coupling, to classical strings rotating in S5. Three point correlation functions of such operators factorize into a universal contribution coming from the AdS part of the string sigma model and a state-dependent S5 contribution. Consequently a similar factorization arises for the OPE coefficients. In this paper we evaluate the AdS universal factor of the OPE coefficients which is explicitly expressed just in terms of the anomalous dimensions of the three operators.
119096516
Chiral Disorder in QCD
Using the Gell{endash}Mann{endash}Oakes{endash}Renner relation and semiclassical arguments, we show that the bulk quark spectrum in QCD exhibits a variety of regimes including the ergodic one described by random matrix theory. We analyze the quark spectral form factor in the diffusive and ballistic regime. We suggest that a class of chiral transitions in QCD is possibly of the metal-insulator type, with a universal spectral statistics at the mobility edge. {copyright} {ital 1998} {ital The American Physical Society}
5420202
Four loop twist two, BFKL, wrapping and strings
Abstract The anomalous dimensions of twist two operators have to satisfy certain consistency requirements derived from BFKL. For N = 4 SYM it was shown that at four loops, the anomalous dimensions derived from the all-loop asymptotic Bethe ansatz do not pass this test. In this paper we obtain the remaining wrapping part of these anomalous dimensions from string theory and show that these contributions exactly cure the problem and lead to agreement with both LO and NLO BFKL expectations.
119400037
Towards a diagrammatic derivation of the Veneziano-Yankielowicz-Taylor superpotential
Abstract We show how it is possible to integrate out chiral matter fields in N =1 supersymmetric theories and in this way derive in a simple diagrammatic way the N f S log S − S logdet X part of the Veneziano–Yankielowicz–Taylor superpotential.