Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 63: Spectroscopy: 180 ≤ A ≤ 208

HK 63.10: Talk

Thursday, March 19, 1998, 16:15–16:30, D

γ–Ray Spectroscopy of Nuclei in the Vicinity of ²⁰⁸Pb with Deep Inelastic Reactions — •H. Grawe¹, M. Rejmund^1,2, K.H. Maier³, R. Broda⁴, B. Fornal⁴, M. Lach⁴, J. Wrzesiński⁴, J. Blomqvist⁵, A. Gadea⁶, J. Gerl¹, M. Górska^1,2, M. Kaspar¹, H. Schaffner¹, R. Schubart¹, Ch. Schlegel¹, and H.J. Wollersheim¹ — ¹GSI, D–64291 Darmstadt,Germany — ²Nuclear Physics Division, Warsaw University, Poland — ³HMI, D–14091 Berlin, Germany — ⁴Institute of Nuclear Physics, Cracow, Poland — ⁵RIT, Physics Department Frescati, Stockholm, Sweden — ⁶INFN, LNL , I–35020 Legnaro, Italy

High spin states in nuclei in the ²⁰⁸Pb region were populated in deep inelastic collisions of ¹³⁶Xe and ²⁰⁸Pb projectiles with thick ²⁰⁸Pb targets at energies about 10% above the Coulomb barrier. Prompt and prompt–delayed γ–γ coincidences were measured.

New high spin states have been identified in ²⁰⁹Pb and ²¹⁰Pb nuclei, which are interpreted as resulting from excitations of a neutron coupled to ²⁰⁸Pb core excited states and excitations of two valence neutrons in the g_9/2, i_11/2 and j_15/2 orbitals respectively. Results are discussed in the frame of particle phonon coupling and large scale shell model calculations including excitations of the ²⁰⁸Pb core.