Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 50: Spectroscopy: 130 ≤ A ≤ 180

HK 50.3: Vortrag

Mittwoch, 18. März 1998, 14:45–15:00, D

Dipole excitations in ¹³⁸Ba studied in photon scattering experiments with two Cluster detectors — •C. Fransen¹, R.-D. Herzberg¹, P. von Brentano¹, J. Eberth¹, J. Enders², A. Fitzler¹, H. Kaiser², L. Käubler³, P. von Neumann-Cosel², N. Pietralla¹, H. Prade³, A. Richter², H. Schnare³, R. Schwengner³, O. Thelen¹, H.G. Thomas¹, H. Tiesler¹, D. Weisshaar¹, I. Wiedenhöver¹, and A. Zilges² — ¹Institut für Kernphysik, Universität zu Köln, 50937 Köln — ²Institut für Kernphysik, TU Darmstadt, 64289 Darmstadt — ³Institut für Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden

Dipole excitations in the spherical nucleus ¹³⁸Ba were investigated at the bremsstrahlung facility of the S-DALINAC accelerator at TU Darmstadt in a photon scattering experiment using two Cluster detectors. This setup is an extension of a successful previous setup [1,2]. The Cluster detector was used as a Compton polarimeter for the first time in a photon scattering experiment. We present excitation energies, spins, cross sections, and transition strengths up to 6.7 MeV and we discuss the data evaluation of the polarization measurements in order to determine parities of the exited states. This work was supported by the Deutsche Forschungsgemeinschaft, Nos. Br 799/6-2 and Ri 242/12-1 and by the BMBF, Nos. 06 OK 862I(O) and 06 DR 666I.

[1] P. von Brentano et al., Phys. Rev. Lett. 76, 2029 (1996).
[2] R.-D. Herzberg et al., Phys. Lett. B390, 49 (1997).