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Recoil-isomer tagging techniques at RITU
Recoil-isomer tagging techniques at RITU
- Source :
- Exotic Nuclei and Atomic Masses ISBN: 9783642624247
- Publication Year :
- 2003
- Publisher :
- Springer Berlin Heidelberg, 2003.
-
Abstract
- Techniques have been developed to study isomeric states in nuclei with the use of RITU (gas filled separator) at the University of Jyvaskyla. The first was the recoil-isomer tagging technique initially, utilised by D.M. Cullen to study the K π = 8− isomeric state in 138Gd [1]. The juro-sphere array was employed in conjunction with ritu and a focal plane array which consisted of several Compton-suppressed Germanium detectors, placed in close geometry around a multi wire proportional counter (mwpc) and a silicon strip detector used for the implantation of recoiling nuclei. This technique correlates prompt and delayed γ-ray transitions across isomeric states and identifies the lifetime of the isomer. The main constraint of this technique is the timing electronics. Only isomers with a half-life greater than the flight time through RITU(~ 300ns) and less than the collection time of the tdc’s (32 μs) can be identified. This time range and hence technique is ideal for the region of mass A = 140 near proton drip line nuclei which have small production cross-sections in comparison to their more neutron rich neighbours and lack charged particle emission suitable for recoil-decay-tagging. Subsequent experiments to ref.
Details
- ISBN :
- 978-3-642-62424-7
- ISBNs :
- 9783642624247
- Database :
- OpenAIRE
- Journal :
- Exotic Nuclei and Atomic Masses ISBN: 9783642624247
- Accession number :
- edsair.doi...........fc8895abdf3eff055e30615fef100398
- Full Text :
- https://doi.org/10.1007/978-3-642-55560-2_182