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Spectroscopy of 9 Li : the new N=6 closed shell nucleus

TRIUMF, Canada. Simon Fraser University, Canada Argonne National Laboratory, USA. Spectroscopy of 9 Li : the new N=6 closed shell nucleus. Rituparna Kanungo St. Mary’s University, Canada.

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Spectroscopy of 9 Li : the new N=6 closed shell nucleus

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  1. TRIUMF, Canada Simon Fraser University, Canada Argonne National Laboratory, USA Spectroscopy of 9Li : the new N=6 closed shell nucleus Rituparna Kanungo St. Mary’s University, Canada A.N. Andreyev, L. Buchmann, B. Davids, G. Hackmann, D. Howell, P. Khalili, B. Mills, E. Padilla Rodal, S. Pieper, J. Pearson, C. Ruiz, G. Ruprecht, A. Shotter, I. Tanihata, C. Vockenhuber, P. Walden, R.B. Wiringa

  2. Search for N=6 shell closure through spectroscopy of 9Li New shell closures in neutron-rich nuclei R. Kanungo et al, PLB 528 (2002) 58

  3. p1/2 6 p3/2 s1/2 8Li 9Li neutrons in [if N=6 is not closed shell] Structure of 9Li n 8Li States of 8Li Orbitals of neutron 3.21 1+ p1/2 3+ 2.25 6 p3/2 0.98 1+ 0.0 2+ s1/2 8Li-levels 8Li [predominant configuration if N=6 is closed shell]

  4. E=1.68A MeV @ TUDA d(9Li,t)8Li @ ISAC, TRIUMF DE = 0.5% DqLEDA = 1.1o - 2.1o DqS2 ~ 0.2o Dqbeam ~ 5mrad fbeam ~ 1mm t 9Li 8Li Dr=0.5mm Dr=5mm S2 [DSSD]

  5. Beam Intensity : Rutherford scattering with C Optical potentials : ‘d’ -elastic scattering d(9Li,t)8Li : S2 only 8Ligs 15000 C- elastic 8Liex1(1+) 12000 d- elastic Energy [keV] 9000 6000 Q- resolution ~ 100keV(s) ISAC1 e = 0.3 mm mrad/b

  6. d(9Li,t)8Li : LEDA only Simulation elastic 8Liex3 8Liex2 Data 8Liex1(1+) 8Ligs 12000 8Ligs elastic 8Liex1 Energy [keV] 8000 4000 40 42 44 46 48 34 36 38 32 26 28 30 qlab [deg]

  7. d(9Li,t)8Li : S2 and LEDA coincidence Simulation elastic 8Liex3 Data 8Liex2(3+) 8000 6000 Energy [keV] 4000 2000 26 30 34 38 42 46 50 qlab [deg]

  8. Angular distribution and DWBA calculation 100 8Ligs (2+) 8Liex1(1+) 10 ds/dW [mb/sr] 1 20 40 60 80 PRELIMINARY 120 100 qcm [deg] 100 8Liex2(3+)

  9. Spectroscopic factors : 9Li St = 1.5 [Ref. Satchler used] VMC calculations yield St = 1.3. PRELIMINARY Total occupation probability of p3/2 orbital ~ 3.5 valence neutrons mainly occupy p3/2 orbital Consistent with N=6 shell closure

  10. Summary Ground state structure of 9Li is investigated through d(9Li,t)8Li one neutron transfer The majority of valence neutrons occupy the p3/2 orbital. Consistent with N=6 shell closure. The spectroscopic factors are in fair agreement with theoretical estimates.

  11. Acknowledgements Our thanks to: ISAC beam delivery team University of York for the LEDA array Prof. T. Davinson, Edinburgh for helpful discussions Prof. J.P. Schiffer, ANL for helpful discussions Prof. P.Kunz, Colorado for helpful discussions Thank you for your kind attention

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