Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Kernphysik / Spektroskopie

HK 30.5: Talk

Wednesday, March 14, 2007, 15:15–15:30, D

Coulomb excitation of ^{112, 114}Sn — •Pieter Doornenbal^1,2, Hans-Jürgen Wollersheim², Peter Reiter¹, Piotr Bednarczyk², Lucia Caceres², Joakim Cederkall³, Andreas Ekström⁴, Jürgen Gerl², Magda Gorska², Akhil Jhingan⁵, Rakesh Kumar^{2, 5}, and R. P. Singh⁵ — ¹IKP, Köln, Germany — ²GSI, Darmstadt, Germany — ³CERN, Geneva, Switzerland — ⁴Lund University, Lund, Sweden — ⁵IUAC, Delhi, India

Recent large-scale shell model calculations of the B(E2;2₁⁺ → 0_g.s.⁺) values of the even tin isotopes between the N = 50 and N = 82 shell closures show a parabolic trend, which resembles the typical behaviour across a shell in the seniority scheme. The calculations are in good agreement with the experimental values for tin isotopes heavier than A = 114. However, the measured results for unstable ¹⁰⁸Sn and stable ^112,114Sn nuclei yield considerable higher B(E2) values in contrast to the theoretical values. In order to improve the accuracy of the crucial B(E2) values of the stable ^112,114Sn isotopes a Coulomb excitation experiment was performed at GSI, employing Sn beams at 3.4 A MeV. The new results confirm the puzzling deviation from the shell model calculations.