Program - Brookhaven National Laboratory

of the setup. One option explored is to use PPAC’s (Parallel Plate Avalanche Detectors) which works very
well for detecting fission fragments but requires more consideration for detecting protons and other deeply
penetrating particles.
[1] U. Tippawan et al., Phys. Rev. C 79, 064611 (2009). [2] R. Bevliacqua et al., Nucl. Instr. Meth. Phys.
Res., A 646 100 (2011). [3] X. Ledoux et al., AIP Conf. Proc. 1412, 55 (2011).
DB 7 5:30 PM
Dipole Strength in Xenon Isotopes
R. Massarczyk, R. Schwengner, A.R. Junghans
Institute for Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
The low-lying dipole strength in medium mass nuclei, which are known as typical fission products, was
investigated in systematic studies using the photon-scattering facility at the electron accelerator of the
Helmholtz-Zentrum Dresden-Rossendorf, Germany [1]. It has been shown, that the experimental strength
found in (γ, γ) studies compared with phenomenological approximations used in statistical model calculations
can have direct consequences for neutron capture cross sections [2] and the resulting deexcitation
spectrum [3]. To investigate if the nuclear deformation has an influence on the dipole strength [4], especially
in the energy region below the neutron-separation energy, we studied the photo-absorption cross
sections of different isotopes in the xenon chain. Additional measurements at the HIγS facility at the Duke
University, USA, allowed us to distinguish between electric and magnetic dipole strength. We will present
experimental results from photon scattering experiments on the gaseous targets 124,128,134 Xe. These will
be compared with results of experiments from other nuclei in the mass region around the closed neutron
shell N = 82 [5,6,7]. The experiments are supported by Deutsche Forschungsgemeinschaft, Project No.
SCHW883/1-1, the German BMBF project TRAKULA and the EURATOM FP7 project ERINDA.
[1] R. Schwengner NIM A 555 211-219 (2005) [2] M. Beard et al. PRC 85, 065808 (2012) [3] G. Schramm
et al. PRC 85, 014311 (2012) [4] A.R. Junghans et al. PLB 670 200-204 (2008) [5] R. Massarczyk et al.
PRC 86, 014319 (2012) [6] A. Makinaga et al. PRC 82, 024314 (2010) [7] A. Tonchev et al. PRL 104,
072501 (2010)
DB 8 5:45 PM
Absolute Cross Sections for Proton Induced Reactions on 147,149 Sm Below Coulomb Barrier
A. Gheorghe, D. Filipescu, T. Glodariu, C. Mihai, D. Bucurescu, M. Ivascu, I. Cata-Danil, L. Stroe, D.
Deleanu, D. G. Ghita, R. Lica, N. Marginean, R. Marginean, A. Negret, T. Sava, S. Toma, and N. V.
Zamfir
Horia Hulubei National Institute of Physics and Nuclear Engineering - IFIN HH
M. Sin, O. Sima
Nuclear Physics Department, University of Bucharest, Bucharest, Romania
G. Cata-Danil
Physics Department, University Politehnica of Bucharest, Bucharest, Romania
The optical model parameters for charged particles (proton - alpha) are key ingredients in reaction cross
sections evaluations widely used to calculate astrophysical reaction rates.These cross sections data may
also be important to the extension of the nuclear data bases required by the development of the future
generations of nuclear reactors. At incident energies below the Coulomb barrier, the predictions of different
optical model parameterizations are tested against experimental cross sections for the (p,gamma) and (p,n)
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