Nuclear resonance fluorescence experiments on 204,206,207,208Pb up to 6.75 MeV

被引：81

作者：

Enders, J ^{[1
]}

von Brentano, P

Eberth, J

Fitzler, A

Fransen, C

Herzberg, RD

Kaiser, H

Käubler, L

von Neumann-Cosel, P

Pietralla, N

Ponomarev, VY

Richter, A

Schwengner, R

Wiedenhöver, I

机构：

[1] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[2] Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany

[3] Forschungszentrum Rossendorf EV, Inst Kern & Hadronenphys, D-01314 Dresden, Germany

来源：

NUCLEAR PHYSICS A | 2003年 / 724卷 / 3-4期

关键词：

Pb-204; Pb-206; Pb-207; Pb-208(gamma; gamma; E=6.75 MeV bremsstrahlung; measured E gamma; I gamma(theta); Pb-208 deduced levels; J; pi; B(M1); B(E1); B(E2); pygmy resonance features; quasiparticle-phonon model analysis;

D O I：

10.1016/S0375-9474(03)01554-9

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Dipole and electric quadrupole excitations in Pb-204,Pb-206,Pb-207,Pb-208 have been measured up to 6.75 MeV in resonant photon scattering experiments at the superconducting Darmstadt electron linear accelerator S-DALINAC using two Euroball-Cluster detector modules. In Pb-208, 14 excited states have been populated; in Pb-206, the decays of 41 states have been detected. Information about 45 heretofore unknown excited states in Pb-204 could be measured as well as eleven known levels in Pb-207. The extracted dipole strength distributions are discussed within phenomenological ("pygmy resonance") and microscopic models (quasiparticle-phonon model). A strong fragmentation and a small shift of the detected E1 strength towards higher energies is observed with the opening of the neutron shell closure. (C) 2003 Published by Elsevier B.V.

引用

页码：243 / 273

页数：31

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