Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Structure and Dynamics of Nuclei XI

HK 58.5: Vortrag

Donnerstag, 17. März 2016, 17:45–18:00, S1/01 A03

High resolution electron scattering off ⁹⁶Zr — •Christoph Kremer, Simela Aslanidou, Sergej Bassauer, Andreas Krugmann, Norbert Pietralla, Vladimir Ponomarev, Maxim Singer, Gerhart Steinhilber, Peter von Neumann-Cosel, and Markus Zweidinger — Institut für Kernphysik TU Darmstadt

The mass region A≈ 100 displays several intriguing nuclear structure phenomena. Of particular interest is the nucleus ⁹⁶Zr which exhibits features of a subdouble shell closure at Z = 40 and N = 56. Its strong octupole correlations lead to a large electric octupole transition strength [B(E3;3₁⁺→ 0₁⁺) = 57(4) W.u.]. Even though ⁹⁶Zr is a good testing ground for theoretical investigations [1] some basic low-energy observables are known with insufficient precision. Especially the transition strenghts of low-lying 2⁺ states, that are important signatures for nuclear structure, have large uncertainties. Electron scattering at low momentum transfer is capable of obtaining these B(E2) values with high precision [2]. A ⁹⁶Zr(e,e’) experiment has been performed at the superconducting electron linear accelerator S-DALINAC at Darmstadt using the high-resolution LINTOTT spectrometer. The B(E2;2₂⁺→ 0₁⁺) value has been directly measured for the first time. An interpretation in terms of type II shell evolution [3] is discussed.
K. Sieja et al., Phys. Rev. C 79, 064310 (2009)
A. Scheikh Obeid et al., Phys. Rev. C 87, 014337 (2013), Phys. Rev. C 89, 037301 (2014)
Y. Tsunoda et al., Phys. Rev. C 89, 031301(R) (2014)
Supported by DFG under contract SFB 1245.