Pygmy dipole strength in 86Kr and systematics of N=50 isotones
Pygmy dipole strength in 86Kr and systematics of N=50 isotones
Schwengner, R.; Massarczyk, R.; Rusev, G.; Tsoneva, N.; Bemmerer, D.; Beyer, R.; Hannaske, R.; Junghans, A. R.; Kelley, J. H.; Kwan, E.; Marta, M.; Raut, R.; Schilling, K. D.; Tonchev, A.; Tornow, W.; Wagner, A.
The dipole strength of the N=50 nucleus 86Kr was studied in photon-scattering experiments using bremsstrahlung produced with electron beams of energies of 7.9 and 11.2 MeV delivered by the linear accelerator ELBE and using quasi-monoenergetic gamma rays of 10 energies within the range from 4.7 to 9.3 MeV delivered by the HIgS facility. A high-pressure gas target was used. We identified 42 levels up to an excitation energy of 10.1 MeV. Simulations of gamma-ray cascades were performed to estimate intensities of inelastic transitions and to correct the intensities of the ground-state transitions for their branching ratios. The photoabsorption cross section derived in this way up to the neutron-separation energy is combined with the photoabsorption cross section obtained from a recent (gamma,n) experiment at HIgS. The enhanced E1 strength found in the range from 6 to 10 MeV is compared with that in the N = 50 isotones 88Sr, 90Zr, and 92Mo and with predictions of calculations within the quasiparticle-phonon model.
Keywords: Photon scattering; bremsstrahlung; polarized gamma rays; photoabsorption cross section; gamma-ray strength function; random-phase-approximation; quasiparticle-phonon model
Involved research facilities
- Radiation Source ELBE DOI: 10.17815/jlsrf-2-58
Related publications
- DOI: 10.17815/jlsrf-2-58 is cited by this (Id 17390) publication
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Physical Review C 87(2013), 024306
DOI: 10.1103/PhysRevC.87.024306
Cited 72 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-17390