Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 60: Nuclear Astrophysics
HK 60.6: Talk
Wednesday, March 18, 2009, 18:15–18:30, H-ZO 60
Photoactivation experiments at HIγS * — •A. Sauerwein1, M. Fritzsche1, N. Pietralla1, C. Romig1, G. Rusev2, D. Savran1, K. Sonnabend1, A.P. Tonchev2, W. Tornow2, and H.R. Weller2 — 1Institut für Kernphysik, TU Darmstadt, Germany — 2Triangle Universities Nuclear Laboratory, Duke University, Durham, NC, USA
The neutron capture cross section of the so-called s-process branching points determines the isotopic abundance ratio of several elements in the mass region above iron. Due to the instability of the branching point nuclei, a direct measurement of their neutron capture cross sections is experimentally challenging. Therefore, we perform the inverse (γ,n) reaction to verify theoretical predictions based on the Hauser-Feshbach formalism like TALYS [1] and NON-SMOKER [2]. The presented method was already used in various activation experiments at the High Intensity Photon Setup of the TU Darmstadt [3,4].
For the first time, photoactivation experiments on s-process branching point nuclei were performed at the High Intensity γ-Ray Source of the Duke FEL Laboratory. Naturally composed Cerium targets have been irradiated to investigate the branching point nucleus 141Ce. The experimental method is presented and preliminary results are discussed.
* supported by the DFG (SFB 634)
[1] A. J. Koning et al. AIP Conf. Proc. 769, (2005) 1154
[2] T. Rauscher et al., At. Data Nucl. Data Tab. 88, (2004) 1
[3] J. Hasper et al., Phys. Rev. C 77 (2008) 015803
[4] K. Sonnabend et al., Astroph. J. 583 (2003) 506