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Recent results and future prospects for nuclear structure studies at the ILL

Abstract : The Lohengrin fission-product spectrometer at the ILL offers some unique opportunities to study the structure of very rare neutron-rich nuclei near 132Sn, in the mass A~100 region and in the A~160 region using microsecond isomeric gamma rays. Techniques to measure isomeric gamma rays, conversion electrons, excited-state lifetimes in the pico-to-nanosecond domain and g factors will be presented. New results on an isomeric state in 98Zr will also be discussed. A 2.5 µs isomeric 17– state at 6.5 MeV has recently been measured with the Lohengrin spectrometer in 98Zr. This spherical isomeric state is believed to have a $(\pi(p_{1/2}^{-2}g_{9/2}^{2})\nu(g_{7/2}^{1}h_{11/2}^1))17–$ configuration and decays into two collective bands. One of the collective bands has a vibrational character, which becomes rotational at higher spins. An idea to build a neutron guide for nuclear structure experiments on very neutron-rich nuclei at the ILL is currently being discussed. A brief outline of a recent neutron-guide experiment will be presented.
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Submitted on : Friday, December 9, 2005 - 9:51:10 AM
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G.S. Simpson, J. Genevey, J.A. Pinston, I. Tsekhanovich, W. Urban. Recent results and future prospects for nuclear structure studies at the ILL. 3rd International Workshop on Nuclear Fission and Fission-Product Spectroscopy, May 2005, Chateau de Cadarache, Saint Paul Lez Durance, France. pp.137-144, ⟨10.1063/1.2137239⟩. ⟨in2p3-00025199⟩



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