Phys.Rev. C 86, 014319 (2012)

R.Massarczyk, R.Schwengner, F.Donau, E.Litvinova, G.Rusev, R.Beyer, R.Hannaske, A.R.Junghans, M.Kempe, J.H.Kelley, T.Kogler, K.Kosev, E.Kwan, M.Marta, A.Matic, C.Nair, R.Raut, K.D.Schilling, G.Schramm, D.Stach, A.P.Tonchev, W.Tornow, E.Trompler, A.Wagner, D.Yakorev

Electromagnetic dipole strength of ¹³⁶Ba below the neutron separation energy

NUCLEAR REACTIONS ¹³⁶Ba(γ, γ'), E at 7.0 MeV/c and 11.4 MeV/c; ¹³⁶Ba(polarized γ, γ')E=4.7, 5.1, 5.6, 6.1, 6.5, 7.0, 7.5, 8.0, 8.4, 8.7, 9.0, 9.3 MeV; measured Eγ, Iγ, integrated σ(E), photoabsorption σ as a function of excitation energy, γ(θ), γ(lin pol) using Bremsstrahlung facility at ELBE, HZDR, and HIγS facility at TUNL. ¹³⁶Ba; deduced levels, J, π, widths, pygmy dipole resonances, dipole strength in the quasicontinuum, enhancement of dipole strength. Statistical code used to simulate inelastic transitions and to determine the branching ratios of transitions to ground state. GEANT4 simulations. Comparison with previous experimental studies, and with theoretical calculations using quasiparticle random-phase approximation (QRPA) and relativistic quasiparticle time blocking approximation (RQTBA) approaches. Comparison of photoabsorption σ in ^136,138Ba and ¹³⁹La targets.

doi: 10.1103/PhysRevC.86.014319