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Recoil-isomer tagging techniques at RITU

Recoil-isomer tagging techniques at RITU

Authors :
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
R. Julin
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