Erlangen 2001 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 5: Kernphysik/Spektroskopie I - Exotische Kerne
HK 5.4: Talk
Monday, March 19, 2001, 17:30–17:45, D
Development of Quadrupole Collectivity in the neutron-rich Se, Ge, Zn, and Ni Isotopes — •H. Scheit1 and MPIK-LAND-FRS2 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2
An experiment was performed at the SIS-FRS facility at GSI to study the collectivity in the neutron-rich Se, Ge, Zn, and Ni isotopes, which are located in the vicinity of the N=50 and the Z=28 shell closures.
A primary beam of 86Kr (E/A=450 MeV; I≈3· 1010 ions/spill) was fragmented on a Be target (4000 mg/cm2) mounted in front of the FRS fragment separator. A cocktail beam of neutron-rich nuclei in the A∼80 region was selected and transmitted to the experimental station in CAVE B, where a Pb target was used to populate their first excited 2+ state via Coulomb excitation. The subsequently emitted γ rays were detected in a new highly segmented CsI detector covering the forward hemisphere from about 10∘ to 85∘. All incident particles were tracked and identified before and after the secondary target.
The measurements allow the energy of the first excited state as well as the corresponding B(E2;0+ → 2+) to be determined. The experimental setup and preliminary results will be presented.