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High-Spin State Studies with Deep-Inelastic Heavy Ion Reactions

High-Spin State Studies with Deep-Inelastic Heavy Ion Reactions. Rafał Broda Niewodniczanski Institute of Nuclear Physics PAN Kraków , Poland. Gasp. Thick Target Eksperiments.

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High-Spin State Studies with Deep-Inelastic Heavy Ion Reactions

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  1. High-Spin State Studies with Deep-Inelastic Heavy Ion Reactions Rafał Broda Niewodniczanski Institute of Nuclear Physics PAN Kraków, Poland

  2. Gasp

  3. Thick Target Eksperiments • All reaction products stopped in the target Discrete gamma lines observed except for those arising from short-lived states • High statistics g-g coincidences are collected including high folds and time parameters correlated with beam pulsing • Selectivity based solely on complex gamma-coincidence analysis Identification of yrast state structures - in previously inaccessible nuclei, predominantly in the neutron-rich region GAMMASPHERE 4 R. Broda et al., JPG 32, 151 (2006)

  4. B.Fornal, W.Królas, T.Pawłat, J.Wrzesiński, R.B. Purdue University, W.Lafayette, IN, USA Argonne National Laboratory, Argonne, Ill, USA Hahn-Meitner Institut, Berlin, Germany INFN LNL Legnaro/Padova University, Włochy Gesellschaft fuer Schwere Ionen, Darmstadt, Germany JYFL-University of Jyvaskyla, Finland LBL Berkeley, Cf, USA

  5. 92Mo + 60Ni

  6. 96Ru 56Fe (Argonne-Notre Dame Array)

  7. 66Ni 48Ca (330 MeV) + 238U (thick target) GAMMASPHERE at Argonne 48Ca

  8. f7/2 p3/2 p1/2 f5/2

  9. PRISMA spectrometer • A magnetic heavy ion spectrometer designed to fully identify (A, Z)fragments deflected at large angles • CLARA: an array of 24 Clover detectors 238U + 330 MeV 48Ca • Complementary sets of data: PRISMA – (A,Z) identification, fast g transitionsand GAMMASPHERE – g-g coincidence data

  10. f5/2 p1/2

  11. 2+

  12. N/Z=1.54 N/Z=1.29

  13. 232Th + 136Xe Berkeley experiment with ~ 80 Gammasphere detectors J.F.C.Cocks et al. Phys.Rev.Lett.78,2920 (1997) J.F.C.Cocks et al. Nucl.Phys.A645, 61 (1999)

  14. 208Pb early high spin states study (e,e’) - J.P. Connelly at al., Phys. Rev. C 45, 2711 (1992) Deep Inelastic Reactions 64Ni + 208Pb - M. Schramm at al., Z. Phys. A 344, 363, (1993)

  15. 206Hg 208Pb (1360 MeV) + 238U Gammasphere at Argonne N/Z=1.59 N/Z=1.54

  16. π h11/2-1ν i13/2-3 22- +36 19+ 19+ +31 19+ 19+ +58 20+ 20+ +58 π h11/2-1ν p1/2-1i13/2-2 18+ +70 16- 16- +17 15- 15- +40 14- 14- +207 π h11/2-1ν i13/2-1 12- +182 9+ 9+ +114 8+ 8+ π s1/2ν i13/2-1 +114 7+ +158 4- 4- +99 π s1/2ν f5/2-1 2- -49 SM Eexp –Ecalc [keV] 81 123

  17. Gamma transitions preceding in time highest isomers

  18. I ~ 30 25+

  19. [π h11/2- 1ν i 13/2-3] 22- E3 - 2207 keV 25+ E3 ! 208Pb E3 2615 keV π h11/2- 1-150 ν i 13/2-3 -260 _____ 2205 keV

  20. [π h11/2- 1ν i 13/2-2] 35/2- E3 - 2256 keV E3 ! 208Pb E3 2615 keV π h11/2- 1-150 ν i 13/2-2 -212 _____ 2253 keV 124

  21. Conclusions: • High spin states are abundantly populated in DIHI reactions • In light nuclei short lifetimes of excited states limit the study of • high-spin states in thick target experiments • In heavy nuclei spin range of I=30 can be reached with the • present gamma arrays detection sensitivity • Challenge - experiment is here more advanced than theory • Spectroscopic study of high-spin states in hard-to-reach nuclei • is continued

  22. beam: 48Ca @ 310 MeV provided by TANDEM ALPI (1.5 pnA current) accelerator complex; target : 1 mg/cm2 stretched 208Pb (1 mg/cm2 Ta backing) ; degrader : 4 mg/cm2 natMg; PRISMA(49◦ grazing angle)+CLARA; Distances: 30 μm, 100 μm, 300 μm, 1240 μm, 2200 μm; 8-days beam-time. J.J.Valiente-Dobon, D.Mengoni et al.

  23. Kraków group and collaborators R. Broda, B. Fornal, W. Królas, T. Pawłat, J. Wrzesiński IFJ PAN Kraków S. Lunardi, A. Gadea, N. Marginean, L. Corradi, A.M. Stefanini, F. Scarlassara, G. Montagnoli, M. Trotta, D. Napoli, E. Farnea Laboratori Nazionali di Legnaro and INFN Padova R.V.F. Janssens, M.P. Carpenter, T. Lauritsen, D. Seweryniak, S. Zhu Argonne National Laboratory

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