RESULTS: Singles Gamma Spectra  Five gamma energy transitions were  observed with energies739 keV, 822 keV, 712 keV 849 keV and 111 keV γ –γ Coincidence.

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Presentation transcript:

RESULTS: Singles Gamma Spectra  Five gamma energy transitions were  observed with energies739 keV, 822 keV, 712 keV 849 keV and 111 keV γ –γ Coincidence Spectra Life time measurement  Shell Model calculation predicted the existence of (19/2 + ) isomer of a similar half life in 127Cd. A calculation using the E3 strength of the neighbouring 129 Sn isotone gives similar life time supporting the spin assignment.  The energy of 13/2 - state,obtained in Shell Model calculation is too high compared to the experiment value. Hence, a modification of the monopole interaction used in the calculation is required. EXPERIMENTAL TECHNIQUE :  In achromatic mode the fragments with same A/Q ratio are focused at the same position on the final focal plane RISING gamma array  15 Euroball cluster detectors with 7 crystals each  Photopeak efficiency ~ 15 % at 1 MeV EXP  48 Cd 79 is a neutron rich nucleus which has 3 neutrons and 2 protons less than the doubly magic 132 Sn. The latter nucleus is a benchmark for nuclear structure investigations.  Systematics of the Cd isotope chain shows evolution of neutron single particle energy levels. F.Naqvi, 1,2 M. Górska, 2 L. Cáceres, 2,3 A.Jungclaus, 3 M. Pfützner, 4 H. Grawe, 2 S. Pietri, 2 P. H Regan, 5 D. Rudolph, 6 Z. Podolyák, 5 K. Andgren, 7 T. Beck, 2 B. Bednarczyk, 2,8 J. Benlliure, 9 G. Benzoni, 10 A.M. Bruce, 11 E. Casarejos, 9 B. Cederwall, 7 F. Crespi, 10 P. Detistov, 12 Zs. Dombrádi, 13 P. Doornenbal, 2 H. Geissel, 2 J. Gerl, 2 J. Grębosz, 2,8 B. Hadinia, 7 M. Hellström, 6 R. Hoischen, 2,6 G. Ilie, 1 J.Jolie, 1 A. Khaplanov, 7 I. Kojouharov, 2 M. Kmiecik, 8 R. Kumar, 14 N. Kurz, 2 S. Lalkovski, 11,12 A. Maj, 8 S. Mandal, 15 V. Modamio, 3 F. Montes, 2 S. Myalski, 8 W. Prokopowicz, 2 P.Reiter, 1 H. Schaffner, 2 G. Simpson, 16 D.Sohler, 13 S.J. Steer, 5 S. Tashenov, 2 J. Walker, 3 H.J. Wollersheim 2 & O. Wieland 10  127 Cd was produced both in fragmentation of 136 Xe 750 MeV/u and in fission of 238 U 650 MeV/u.The intensities of the beams were ~ 7.4 X 10 8 ions/s and ~ 2.7 X 10 8 ions/s respectively  9 Be targets of thickness 1g/cm 2 and 4g/cm 2 were used for fission and fragmentation of 238 U and 136 Xe beams respectively  The observed neutron single particle evolution helps in determining the monopole interaction used in SM calculation.  The comparison of theoretical predictions and experimental results provides a means for understanding the structure of neutron rich isotopes below 132 Sn and possible on-set of collectivity. 1 Institut für Kernphysik, Universität zu Köln, D Köln, Germany. 2 Gesellschaft für Schwerionenforschung (GSI), D Darmstadt, Germany 3 Departamento de Física Teórica, Universidad Autónoma de Madrid, E Madrid, Spain. 4 IEP, Warsaw University, PL Warsaw, Poland. 5 Department of Physics, University of Surrey, Guildford, GU2 7XH, UK. 6 Department of Physics, Lund University, S Lund, Sweden. 7 KTH Stockholm, S Stockholm, Sweden.. 8 The Henryk Niewodniczański Institute of Nuclear Physics, PL Kraków, Poland. 9 Universidad de Santiago de Compostela, E Santiago de Compostela, Spain. 10 INFN, Universitádegli Studi di Milano and INFN Seizone di Milano,I Milano, Italy. 11 School of Engineering, University of Brighton, Brighton, BN2 4GJ, UK. 12 Faculty of Physics, University of Sofia, BG-1164 Sofia, Bulgaria. 13 Institute National Polytechnique de Grenoble, F – Grenoble Cedex, France 14 Inter University Accelerator Centre, New Delhi, India. 15 University of Delhi, New Delhi, India. 16 Institut Laue-Langevin, F Grenoble, France. FRAGMENT SEPARATOR Z Measurement  Energy loss in two MUlti Sampling Ionisation Chambers at S4 A/Q Measurement  Time of flight measurement between scintillators Sc21 at S2 and Sc42 at S4 Bρ-ΔE-Bρ method (Achromatic Mode) SM  The decay of yrast (19/2 + ) isomer was observed in 127 Cd.  Based on the measured half-life T 1/2 = 17.5(3)µs, primary decay transitions were assigned to be an E3 of 849 keV and M2/E3 of 739 keV. TOF : βγ DIPOLE : Bρ 127 Identification plot Energy and lifetime information from the gamma array  Gamma coincidence spectra gated on 739 keV  Time distribution obtained by summing the gates at 712 keV, 739 keV, 821 keV, and 849 keV on the energy vs time matrix  A maximum likelihood fit gives a half life of T 1/2 = 17.5(3) µs 