Gamma-ray fast-timing coincidence measurements from the 18O+18O fusion-evaporation reaction using a mixed LaBr3-HPGe array.

Autor: Alharbi T; Department of Physics, University of Surrey, Guildford GU2 7XH, UK. t.alharbi@surrey.ac.uk, Mason PJ, Regan PH, Podolyák Z, Mărginean N, Nakhostin M, Bowry M, Bucurescu D, Căta-Danil G, Căta-Danil I, Deleanu D, Filipescu D, Glodariu T, Ghiţă D, Mărginean R, Mihai C, Negret A, Pascu S, Sava T, Stroe L, Suliman G, Zamfir NV, Bruce AM, Rodriguez Triguero C, Bender PC, Garg U, Erduran MN, Kusoglu A, Bostan M, Detistov P, Alkhomashi N, Sinha AK, Chakrabarti R, Ghugre SS
Jazyk: angličtina
Zdroj: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine [Appl Radiat Isot] 2012 Jul; Vol. 70 (7), pp. 1337-9. Date of Electronic Publication: 2011 Dec 03.
DOI: 10.1016/j.apradiso.2011.11.040
Abstrakt: We report on a gamma-ray coincidence analysis using a mixed array of hyperpure germanium and cerium-doped lanthanum tri-bromide (LaBr3:Ce) scintillation detectors to study nuclear electromagnetic transition rates in the pico-to-nanosecond time regime in 33,34P and 33S following fusion-evaporation reactions between an 18O beam and an isotopically enriched 18O implanted tantalum target. Energies from decay gamma-rays associated with the reaction residues were measured in event-by-event coincidence mode, with the measured time difference information between the pairs of gamma-rays in each event also recorded using the ultra-fast coincidence timing technique. The experiment used the good full-energy peak resolution of the LaBr3:Ce detectors coupled with their excellent timing responses in order to determine the excited state lifetime associated with the lowest lying, cross-shell, Iπ=4- "intruder" state previously reported in the N=19 isotone 34P. The extracted lifetime is consistent with a mainly single-particle M2 multipolarity associated with a f7/2→d5/2 single particle transition.
(Copyright © 2011 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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