EURONS Town Meeting 2008
September 17 - 19, 2008 -
Information

Title:	Mr.
Family Name:	Myalski
First Name:	Szymon
Gender:	male
E-Mail:	szymon.myalskiifj.edu.pl
Affiliation for Badge:	IFJ, Cracow
Institute:	Institute of Nuclear Physics PAN
Address (Street):	ul. Radzikowskiego 152
Postal Code, City:	31-342 Kraków, Poland
Country:	Poland
Phone:	+48 12 662-82-00
Fax:	+48 12 662-84-58
Young researcher with contribution:	Yes
Arrival Date:	September 16
Departure Date:	September 20
Author(s):	S.Myalski, F.Becker, P.Bednarczyk, G.Benzoni, B.Blan4, C.Brandau, A.M.Bruce, L.Caceres, F.Camera, W.N.Catford, I.J.Cullen, Zs.Dombradi, P.Doornenbal, E.Estevez, A.B.Garnsworthy, H.Geissel, W.Gelletly, J.Gerl, M.Górska, H.Grawe, J.Grębosz, A.Heinz, R.Hoischen, G.Ilie, G.A.Jones, A.Jungclaus, A.Kelic, M.Kmiecik, I.Kojouharov, F.G.Kondev, T.Kurtukian
Institute(s):	IFJ PAN Kraków, GSI Darmstadt, UNIMI and IFNF Milano, CENBG Gradignan Cedex, UP US Guildford, SE UB Brighton, DFT UAM Madrid, INR Debrecen, USC Santiago de Compostella, WNSL YU New Haven, IKP UK Köln, DP LU Lund, NIPNE Bucharest, NED ANL Argonne, FP US Sofia, IFD UW Warszawa, IF UJ Kraków, PD E12 TUM München, JAERI Kyoto, IF PAN Warszawa
Title:	Isomeric ratios for nuclei with Z=62-67 and A=142-152 produced in the relativistic fragmentation of 208Pb
Abstract:	We have investigated isomeric states in a number of nuclei with Z=62-67 and A=142-152. They were produced by the fragmentation of the relativistic (1 GeV/u) 208Pb beam from the SIS-18 synchrotron of the GSI facility on a 9Be target, and selected by the FRagment Separator (FRS). The selected nuclei of interest were implanted into the stopper, a block of plastic 7mm thick. The gamma-rays from the decay of isomeric states in the implanted nuclei were measured by the high purity germanium array, RISING. In total 22 nuclides were detected, isomeric states were observed in 9 of them: 19- in 152Ho, 31/2+ in 153Ho, 27+ in 148Tb, 10+ in 144Gd, 49/2+ in 147Gd, 11/2- in 143Eu, 8- in 144Eu, 11/2- in 145Eu, 10+ in 142Sm and 7- in 142Sm. Of special interest is the 27+ state in 148Tb, as this is the highest spin that has been populated through the fragmentation reaction until present day. The aim of this work was the extraction of isomeric ratios (IR) for these isomeric states. The IR is the number of ions populated in a given isomeric state compared to the total number of ions populated for the selected nuclide. The IR can provide information about the production reaction and nuclear structure. It was evaluated based on time of flight, half-life decay, in-flight losses and by considering the finite measurement time . Results were compared with theoretical predictions, calculated using an abrasion-ablation approach. This work is supported by the EURONS (EU contract number 506065) and the Polish Ministry of Science and Higher Education (Grant nr 1-P03B-030-30)

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