Journalartikel

Jahr der Veröffentlichung: 2004

Zeitschrift: Physical Review C

Bandnummer: 70

Heftnummer: 4

ISSN: 0556-2813

eISSN: 1089-490X

DOI Link: https://doi.org/10.1103/PhysRevC.70.044319

Verlag: American Physical Society

Abstract: 
The low-lying dipole strength distributions in the odd-mass isotopes Ba-135,Ba-137 were studied in nuclear resonance fluorescence experiments (NRF) performed at the Stuttgart Dynamitron facility using bremsstrahlung beams with end point energies of 4.1, 3.1, and 2.5 MeV. Numerous excited states, most of them unknown so far, were observed in the excitation energy range up to 4 MeV. Detailed spectroscopic information has been obtained on excitation energies, decay widths, decay branching ratios, and transition probabilities. The results for Ba-137 are compared with calculations in the framework of the Quasiparticle-Phonon Model. The new data for Ba-135,Ba-137 complete the systematics of low-lying dipole excitations as observed for the even Ba isotopes Ba-134,Ba-136,Ba-138 in previous NRF experiments in Stuttgart. The complete systematics within the Ba isotopic chain, exhibiting a nuclear shape transition, is discussed with respect to E1 two-phonon excitations, M1 scissors mode excitations, and in regard to the new critical point symmetries.

Harvard-Zitierstil: Scheck, M., von Garrel, H., Tsoneva, N., Belic, D., von Brentano, P., Fransen, C., et al. (2004) Dipole strength distributions in the stable Ba isotopes ^134-138Ba:: A study in the mass region of a nuclear shape transition -: art. no. 044319, PHYSICAL REVIEW C, 70(4), Article 044319. https://doi.org/10.1103/PhysRevC.70.044319

APA-Zitierstil: Scheck, M., von Garrel, H., Tsoneva, N., Belic, D., von Brentano, P., Fransen, C., Gade, A., Jolie, J., Kneissl, U., Kohstall, C., Linnemann, A., Nord, A., Pietralla, N., Pitz, H., Stedile, F., Stoyanov, C., & Werner, V. (2004). Dipole strength distributions in the stable Ba isotopes ^134-138Ba:: A study in the mass region of a nuclear shape transition -: art. no. 044319. PHYSICAL REVIEW C. 70(4), Article 044319. https://doi.org/10.1103/PhysRevC.70.044319