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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 16: Nuclear Structure/Spectroscopy II

HK 16.1: Group Report

Tuesday, March 9, 2004, 15:30–16:00, A

The neutron-rich Na and Mg isotopes — •Heiko Scheit — Max-Planck-Institut für Kernphysik, Heidelberg

More than 30 years after the first observation of the neutron-rich Na isotopes (at ISOLDE) the unusual properties of the Na and Mg isotopes in the vicinity of the N=20 shell closure are still not fully understood. The existing experimental data are sparse and sometimes even contradictory, e.g. the measured B(E2; 0gs → 21+) values of the even-even isotopes 30,32Mg deviate by as much as a factor of two from each other[1-3].

The recently commissioned REX accelerator for exotic nuclei at ISOLDE together with the modern HPGe array MINIBALL offers the opportunity to study the collective and single particle properties of these nuclei with standard nuclear physics tools such as (sub Coulomb barrier) Coulomb excitation and single-nucleon transfer reactions in inverse kinematics.

After giving a short introduction of REX and MINIBALL I will summarize the current status of research on the neutron-rich Na and Mg isotopes with special emphasis on our new results from REX-ISOLDE with the MINIBALL array.

[1] T. Motobayashi et al., Phys. Lett. B346 , 9 (1995).

[2] B.V. Pritychenko et al., Phys. Lett. B461 , 322 (1999).

[3] V. Chiste et al., Phys. Lett. B514, 233 (2001).

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