Directory: gamma/ File: gamma-strength-micro.readme (January 15, 2002) ********************************************************* gamma-strength-micro/zxxx.dat Compilations of QRPA strength functions (provided by S. Goriely on January 15, 2002) ******************************************** QRPA PREDICTION OF E1-STRENGTH FUNCTIONS S. Goriely Universite Libre de Bruxelles (Belgium) E. Khan Institut de Physique Nucleaire, Orsay (France) Content -------- Predictions of the E1-strength functions for 3317 nuclei with 8<=Z<=84 lying between the proton and neutron driplines. The E1-strength functions are determined within the QRPA model based on the SLy4 Skyrme force [1,2]. The ground state is consistently calculated within the Hartree-Fock+BCS model based on the same SLy4 force. The QRPA equations are solved in the configuration space so as to exhaust the energy weighted sum rule. All QRPA calculations are performed in the spherical approximation. A folding procedure is applied to the QRPA strength distribution to take the damping of the collective motion into account. In the case of deformed nuclei, a phenomenological splitting of the QRPA resonance strength is performed in the folding procedure. The resulting E1-strength function is found to be in close agreement with photo-absorption data as well as with the available experimental E1 strength at low energies [1]. When dealing with neutron-rich nuclei, the QRPA predictions start deviating from a simple and widely-used Lorentzian shape. In particular, some extra strength is located at energies lower than the GDR energy. The more exotic the nucleus, the stronger this low-energy component. All details about the model and the comparison with experimental data can be found in [1]. Format ------ Each isotopic chain is included in a single file, which name refers to the atomic number (e.g., z026.dat). The E1-strength functions are tabulated on the energy grid of 0.1 MeV between 0 and 30 MeV . For each isotope there is a header line in the format (' Z=',i4,'A=',i4,2x,a2) containing: Z : charge number A : mass number El: element symbol which is followed by a title line and 301 lines with U : excitation energy in MeV fE1: E1 strength function in mb/MeV The corresponding FORTRAN format is (f9.3,e12.3) References ---------- [1] S. Goriely and E. Khan (2002) Nucl. Phys. A706 (2002) 217. [2] E. Khan et al., Nucl. Phys. A694 (2001) 103.