Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 48: Nuclear Structure and Dynamics I

HK 48.1: Talk

Wednesday, March 18, 2009, 14:00–14:15, H-ZO 40

E0 Transition strengths from X(5) to the Rigid Rotor * — •A. Krugmann¹, J. Bonnet¹, N. Pietralla¹, and R. V. Jolos² — ¹Institut für Kernphysik, Technische Universität Darmstadt, Germany — ²Joint Institute for Nuclear Research, Dubna, Russia

Relative and absolute E0 transition strengths [ρ²(E0)] on the transitional path between the X(5) solution and the Rigid Rotor Limit have been evaluated within the framework of the Confined β-Soft (CBS) rotor model. Relative E0 transition strengths between the β-vibrational band and the ground state band decrease with increasing angular momentum for a given potential stiffness. Absolute E0 transition strengths drop with increasing potential stiffness towards zero in the Rigid Rotor Limit. The Z-independent quantity X∝ρ²(E0;0₂⁺→ 0₁⁺)/B(E2; 0₂⁺→ 2₁⁺) has been traced between X(5) and the Rigid Rotor. It reaches the value 4β_M² at the Rigid Rotor Limit, as previously derived by Rasmussen [1]. A new Inter-Band E0−E2 correlation observable Y∝ ρ²(E0;0₂⁺→ 0₁⁺)/B(E2; 0₂⁺→ 2₁⁺)² has been proposed [2], which is independent on the absolute nuclear deformation and solely depends on the nuclear stiffness. Available data for X and Y are in satisfactory agreement with the CBS model.

[1] J.O. Rasmussen, Nucl. Phys. 19 (1960) 85-93.

[2] J. Bonnet, A. Krugmann, J. Beller, N. Pietralla, R.V. Jolos, submitted to Phys. Rev. C.

* Supported by the DFG through SFB 634.