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5. Recoil-isomer tagging techniques at RITU

Author

D. M. Cullen, G. D. Jones, D. T. Joss, O. Stezowski, E. S. Paul, Ch. Schlegel, K. J. Eskola, A. J. Boston, Matti Leino, Peter M. Jones, P. Nieminen, T. Page, R. D. Humphreys, P. M. Walker, Heikki Kettunen, Janne Pakarinen, Ch. Theisen, H. C. Scraggs, M. Caamaño, P. A. Butler, T. L. Khoo, R.-D. Hersberg, Juha Uusitalo, C. Scholey, H. Kankaanpää, J. Garcés Narro, I. Kozhoukharov, Paul Greenlees, M. A. Bentley, J. E. Bastin, Kerttuli Helariutta, SM Vincent, R. D. Page, Y. Le Coz, O. Dorvaux, S. L. Shepherd, C. Fox, P. Rahkila, S. Juutinen, M. Muikku, Alison Bruce, Pasi Kuusiniemi, A.-P. Leppänen, T. Enqvist, and R. Julin

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, Proportional counter, 7. Clean energy, 01 natural sciences, Particle detector, Particle identification, Charged particle, Semiconductor detector, Nuclear physics, Recoil, 0103 physical sciences, Neutron, 010306 general physics
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.

Published
2003
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6. SACRED @ RITU

Author

P. Rahkila, P. A. Butler, H. Kankaanpää, T. Enqvist, P. T. Greenlees, R. D. Herzberg, R. D. Humphreys, G. D. Jones, P. Jones, R. Julin, S. Juutinen, A. Keenan, H. Kettunen, P. Kuusiniemi, M. Leino, A.-P. Leppänen, L. Miettinen, P. Nieminen, T. Page, J. Pakarinen, C. Scholey, and J. Uusitalo

Published
2003
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