Isomeric states in 208 Hg and 209 Tl populated in fragmentation of 238 U
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1 Isomeric states in 208 Hg and 209 Tl populated in fragmentation of 238 U Nawras Al-Dahan 1/17
2 Outline: Physics Motivation Experimental Set-up Results Future Work 2/17
3 Physics Motivation: Studies of magic nuclei are fundamental importance in our understanding of nuclear structure. Information on the single-particle energies and two-body residual interactions. Z N
4 Experimental Set-up: Identification in mass and charge in the FRS: 1 GeV/u 238 U TOF TOF Scintillator(S2) mv F QvB A B e Q u c 2 Bρ is the magnetic rigidity. v is determined from the time of flight Q is the charge Hence A/Q can be calculated Scintillator(S4) ΔE ~ Z 2 4/17
5 RISING Ge array degrader Ionization Chambers (MUSIC41,42) Sc43 Stopper Scintillators (Sc41,Sc42) Time Projection Chamber (TPC41, TPC42)
6 The Active Stopper: The nuclei of interest were implanted in the active stopper which consists of six 5 x 5 cm DSSSDs (16 horizontal & vertical strips) to measure implants and β-decays in the same pixel. Detector Box Beam as seen from above A1 A2 B1 B2 C1 C2 R. Kumar et al., Nucl. Inst. Meth. A598(2009) /17
7 Results: Particle Identification: Δq=0 7/17
8 Prove Particle Identification: (a) Steve J. Steer PhD Thesis, University of Surrey, (b) Zs. Polodyák et al., Enam Con. Proceeding Eur. Phys Jour. A, (c) B.Fornal et al.,phys.rev.lett. 87 (2001) /17
9 New Isomer 208 Hg /17
10 Gamma-Gamma Coincidences 10/17
11 Half-life of 208 Hg (preliminary): Energy(keV) Total Intensity 520(72) 531(76) 490(76) 11/17
12 Level Scheme 208 Hg H. Grawe, private communication. 12/17
13 Level Scheme 208 Hg H. Grawe, private communication. 13/17
14 New Isomer 209 Tl New New 1- H.Xiaolong and W. Baosong, Nucl. Sci. &Tech., 18(2007) C. Ellegaard et al., Nuc. Phys., A259 (1976) /17
15 Gamma-Gamma Coincidences 15/17
16 Future Work Finish interpretation of 208 Hg and 209 Tl (shell model calculations). Analyse beta-decay of 205 Pt and nuclei around it. 16/17
17 Acknowledgments Paddy Regan and Zsolt Podolyák (Supervisors) Nuclear Physics Group at Surrey University Funding: EPSRC/STFC, The Iraqi Government by Ministry of Higher Education And Scientific Research - Kerbala University, Science College- Physics Department and EURONS. Zs. Podolyák 1,P.H. Regan 1, S.J. Steer 1,,A.M. Denis Bacelar 3,N. Alkhomashi 1 W. Gelletly 1,P.M. Walker 1,G. Farrelly 1,T. Swan 1, M. Gόrska 2, J. Gerl 2, S.B. Pietri 2,C. Domingo-Pardo 2, H.J. Wollersheim 2, J. Benlliure 3, A.M. Bruce 3,S. Lalkovski 3, A. Algora 4,J. P. Boutachkov 3,A. Bracco 10,E.Calore 7,E. Casarejos 5, P. Detistov 6,9, Z. Dombradi 12, M. Doncel 6, F. Farinon 2, H. Geissel 3,N. Goel 3, J. Grebosz 8, R. Hoischen 14, I. Kojouharov 3, S. Leoni 10,F. Molina 4,A.I. Morales 5,D. Montanari 10,A. Musumarra 11,R. Nicolini 10,D.R. Napoli 7,C. Nociforo 3,A.Prochazka 3,B. Rubio 4,D. Rudolph 14,S. Vermas 5, P.Strmen 13,I. Szarka 13,J.J. Valiente-Dobón 7,H. Weich 3 1 Department of Physics, University of Surrey, Guildford GU2 7XH, UK 2 GSI, Planckstrasse 1, D-64291, Darmstadt, Germany 3 School of Environment and Technology, University of Brighton, Brighton, BN2 4GJ, UK 4 Instituto de Física Corpuscular, Universidad de Valencia, E-46071, Spain 5 Universidad de Santiago de Compostela, E-15706, Santiago de Compostela, Spain 6 Laboratorio de Radiaciones Ionizantes, Universidad de Salamanca, E-37008, Spain 7 INFN-Laboratori Nazionali di Legnaro, Italy 8 The Henryk Niewodniczánski Institute of Nuclear Physics, PL , Kraków, Poland 9 St. Kliment Ohridsky University of Sofia, 1164 Sofia, Bulgaria 10 University of Milan 11 INFN - Laboratori Nazionali del Sud, via S.Sofia 62, Catania, Italy 12 Institute of Nuclear Research of the Hungarian Academy of Sciences, P.O. Box 51, Debrecen, H-4001, Hungary 13 BratislavaFaculty of Mathematics and Physics, Comenius University, Bratislava, Slovak Republic 14 Department of Physics, Lund University, S Lund, Sweden
18 Thank you
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22 K α1 = KKα α2 = K β1 = K β2 =82.473
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