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München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Structure and Dynamics of Nuclei III

HK 21.3: Vortrag

Dienstag, 19. März 2019, 14:45–15:00, HS 14

Using the Doppler-shift attenuation method to extract lifetimes in 20Ne — •David Werner1, Andrey Blazhev1, Alfred Dewald1, Jan Jolie1, Claus Müller-Gatermann1, Pavel Petkov1,2, and Karl Oskar Zell11University of Cologne, Institute for Nuclear Physics, Cologne — 2National Institute for Physics and Nuclear Engineering, Bucharest, Romania

In the series of Ne isotopes it becomes apparent that for 20,22Ne the drastic increase in B(E2; 2+→0+) strength, compared to the double-magic 16O, is difficult to be reproduced by modern configuration-mixing models [1] or shell model calculations without changing parameters, such that they deviate drastically from those describing neighbouring nuclei. Because of this discrepancy, we remeasured lifetimes in 20Ne and 22Ne using the Doppler-shift attenuation method. The experiments were performed at the Cologne FN Tandem accelerator in October 2017 using the 9Be(16O,nα)20Ne and 9Be(18O,nα)22Ne reactions with a 0.9 mg/cm2 Be target on a 2.7 mg/cm2 Mg backing at multiple beam energies between 30 and 38 MeV. The stopping powers of the reaction products in target and backing were measured at the Cologne Accelerator Mass Spectrometer in March 2018. For the line shape analysis an improved version of DESASTOP [2] was used, which utilizes a Monte-Carlo simulation of the stopping process of the recoil nuclei. Detailed discussion of the used analysis method as well as results will be presented and compared to the systematics of light nuclei.
[1] J. Le Blois et al., Phys. Rev. C 89 (2014) 011306(R)
[2] G.Winter, NIM 214 (1983) 537

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