ar X iv : n uc l - th / 9 60 60 04 v 1 4 J un 1 99 6 Quenching of 1 + excitations in the double giant resonance

ar X iv : n uc l - th / 9 41 20 08 v 1 6 D ec 1 99 4 DOUBLE - DIPOLE EXCITATIONS IN 40 Ca

The double-dipole strength distribution in 40 Ca is calculated microscopically within a model space of 1p1h-and 2p2h excitations. Anharmonic effects in the centroid energies of the 0 +-and 2 + components are found to be small, in agreement with experimental observation. Firm conclusions about the spreading width cannot be drawn, as yet, due to computational limitations in the number of 2p2h sta...

ar X iv : n uc l - th / 9 90 60 29 v 3 1 5 Ju l 1 99 9 1 Quark Matter ’ 99 — Theoretical Summary : What Next ?

ar X iv : n uc l - th / 9 70 60 35 v 1 1 6 Ju n 19 97 Is there a Pronounced Giant Dipole Resonance in 4 He ?

A four–nucleon calculation of the total 4He photodisintegration cross section is performed. The full final–state interaction is taken into account for the first time. This is achieved via the method of the Lorentz integral transform. Semi–realistic NN interactions are employed. Different from the known partial two–body 4He(γ, n)3He and 4He(γ, p)3H cross sections our total cross section exhibits...

ar X iv : n uc l - th / 9 60 80 57 v 2 1 8 N ov 1 99 6 Strong decays of nonstrange q 3 baryons

ar X iv : n uc l - th / 9 90 80 75 v 1 2 6 A ug 1 99 9 SU ( 2 , 1 ) Dynamics of Multiple Giant Dipole Resonance Coulomb Excitation

We construct a three-dimensional analytically soluble model of the nonlinear effects in Coulomb excitation of multiphonon Giant Dipole Resonances (GDR) based on the SU(2,1) algebra. The full 3-dimensional model predicts further enhancement of the Double GDR (DGDR) cross sections at high bombarding energies. Enhancement factors for DGDR measured in thirteen different processes with various proje...