Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Structure and Dynamics of Nuclei V

HK 26.6: Talk

Wednesday, April 1, 2020, 15:30–15:45, J-HS E

Prompt and delayed spectroscopy of ⁹⁴Kr with the NuBall-Spectrometer* — •Rosa-Belle Gerst, Andrey Blazhev, and Nigel Warr for the NuBall collaboration — Institut für Kernphysik, Universität zu Köln

The isotopic chain of krypton isotopes from the proton rich to the neutron rich side has been investigated extensively in recent years since they are home to a variety of shape phenomena. In 2018, the neutron-rich isotopes were again studied, this time with fast-neutron induced fission of ²³⁸U as part of the NuBall campaign at the ALTO facility at the IPN Orsay. A fast-neutron beam was produced with the neutron source LICORNE which uses a p(⁷Li,⁷Be)n inverse reaction. The ⁷Li beam was provided by the 15 MV Tandem Van de Graaff accelerator in a 400ns pulsed mode. The fast neutrons then impinged on a 100g ²³⁸U target to induce fission. The gamma-rays from the excited fission fragments were measured with the NuBall-array [1], a novel hybrid gamma-spectrometer consisting of 24 HPGe clover, 10 HPGe Phase I and 20 LaBr3 detectors. The pulsed beam allows the investigation of prompt and delayed gamma-transitions separately and in coincidence. During the analysis of the data, a new short-lived isomer was discovered in 94Kr [2] extending the previously known level scheme [3].
*Supported by the DFG under Grant No. BL 1513/1-1
[1] M. Lebois et al., to be published
[2] R.-B. Gerst et al., in preparation
[3] T. Rzaca-Urban et al., The European Physical Journal A - Hadrons and Nuclei 9, 165 (2000)