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Lifetime measurement of the six-quasiparticle isomer in 140Nd and evidence for an isomer above the 19/2+ state in 139Nd
Ferraton M., Bourgain R., M. Petrache C., Verney D., Ibrahim F. et al
European Physical Journal A 35 (2008) 167-170 - http://hal.in2p3.fr/in2p3-00273558
Physique/Physique Nucléaire Expérimentale
Lifetime measurement of the six-quasiparticle isomer in 140Nd and evidence for an isomer above the 19/2+ state in 139Nd
M. Ferraton1, R. Bourgain1, C. M. Petrache1, D. Verney1, F. Ibrahim1, N. De Séréville1, S. Franchoo1, M. Lebois1, C. Phan Viet1, L. Sagui1, I. Stefan1, J. F. Clavelin1, M. Vilmay1
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
http://ipnweb.in2p3.fr
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
France
The lifetime of the recently discovered six-quasiparticle (6-qp) isomer in 140Nd has been measured using the 126Te(18O, 4n) reaction and the pulsed-beam technique at the Institut de Physique Nucléaire (IPN) Orsay. The deduced lifetime of the 6-qp isomer in 140Nd of 1.23(7)μs supports the 20+ spin-parity assignment to the isomeric state which is based on a spherical configuration that coexists with the triaxial bands observed in this spin range. Evidence for delayed components for the transitions below the 19/2+ state in 139Nd was observed, with an apparent half-life of 272(4)ns

Articles dans des revues avec comité de lecture
2008
European Physical Journal A
35
167-170

27.60.+j ; 21.60.-n ; 21.10.Tg