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Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Poster

HK 27.89: Poster

Tuesday, March 28, 2017, 16:45–18:45, F Foyer

Damages of plunger targets due to swift heavy ion irradiation — •Christoph Fransen, Andrey Blazhev, Thomas Braunroth, Alfred Dewald, Alina Goldkuhle, Claus Müller-Gatermann, Dorothea Wölk, and Karl-Oskar Zell — Institut für Kernphysik, Universität zu Köln

For lifetime measurements of excited nuclear states with the recoil distance Doppler-shift (RDDS) method and the plunger target foils with very good surface qualities, i.e., roughnesses in the micrometer range, are often essential. Therefore, these targets are typically stretched over highly precisely made cones and careful estimates on the target temperature in the beam spot are required to avoid the formation of bumps in these foils due to beam-induced heating up caused by the energy transfer. However, when performing RDDS experiments with heavy ion beams with energies of several MeV/u an additional effect must be considered: the sensitivity of several (metallic) target materials to the electronic stopping power (Se) of swift heavy ions causing structural changes [1]. This effect is known in material science since several years, but in RDDS experiments it was only observed in very recent experiments by our group where extreme wrinkles appeared in some target foils with amplitudes of the order of 100 µm. Such can hamper a RDDS measurement completely. Based on the results and predictions in [1,2] we will discuss these observations with respect to the choice of target materials including the use of multilayer targets.
[1] Z.G. Wang, et al., J. Phys. Condens. Matter 6 (1994) 6733
[2] M. Toulemonde et al, Nucl. Instr. Meth. B 277 (2012) 28

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