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

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• 作者：T. Alharbi^a ; ^b ; ^{t.alharbi@surrey.ac.uk} ; P.J.R. Mason^a ; P.H. Regan^a ; Zs. Podoly&aacute ; k^a ; N. M膬rginean^c ; M. Nakhostin^a ; M. Bowry^a ; D. Bucurescu^c ; G. C膬ta-Danil^c ; I. C膬ta-Danil^c ; D. Deleanu^c ; D. Filipescu^c ; T. Glodariu^c ; D. Ghi牛膬^c ; R. M膬rginean^c ; C. Mihai^c ; A. Negret^c ; S. Pascu^c ; T. Sava^c ; L. Stroe^c ; G. Suliman^c ; N.V. Zamfir^c ; A.M. Bruce^d ; C. Rodriguez Triguero^d ; P.C. Bender^e ; U. Garg^f ; M.N. Erduran^g ; A. Kusoglu^h ; M. Bostan^h ; P. Detistovⁱ ; N. Alkhomashi^j ; A.K. Sinha^k ; R. Chakrabarti^k ; S.S. Ghugre^k
• 关键词：Lifetimes of excited nuclear states ; Gamma-ray spectroscopy ; EM nuclear transition rates
• 刊名：Applied Radiation and Isotopes
• 出版年：2012
• 期刊代码：6_09698043
• 类别：ce
• 出版时间：July, 2012
• 卷：70
• 期：7
• 页码：1337-1339
• 文件大小：405 K

摘要

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, 鈥渋ntruder鈥?state previously reported in the m>Nm>=19 isotone ³⁴P. The extracted lifetime is consistent with a mainly single-particle M2 multipolarity associated with a single particle transition.