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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Structure and Dynamics of Nuclei III
HK 13.2: Gruppenbericht
Dienstag, 17. März 2026, 16:45–17:15, AM 00.011
γ-ray spectroscopy of neutron-rich radioactive isotopes using two-neutron transfer reactions — •C.M. Nickel1, V. Werner1, G. Rainovski2, A. Blazhev3, A. Esmaylzadeh3, C. Fransen3, K.E. Ide1, J. Jolie3, K. Gladnishki2, V. Karayonchev3, D. Kocheva2, R. Lică4, N.M. Mărginean4, H. Mayr1, C. Mihai4, R.E. Mihai4, S. Pascu4, N. Pietralla1, F. von Spee3, T. Stetz1, and R. Zidarova1 — 1TU Darmstadt — 2U Sofia — 3U Cologne — 4IFIN-HH
Moderately neutron-rich radioactive nuclei can be efficiently populated by the (18O,16O) two-neutron transfer reaction. It allows measurements of γ-ray coincidences and angular correlations as well as excited-states’ lifetimes, hence, electromagnetic matrix elements. We have recently applied it to Zr, Te, Sm, Er, Yb, Pt and Pb isotopes [1]. Lifetime data on the neutron rich isotopes 210Pb [2] and 200Pt [3] were obtained from recoil-distance Doppler-shift experiments at the Cologne and IFIN-HH tandem facilities. Data on 210Pb solidify a discrepancy in shell-model descriptions of 21+ and 41+ states around 208Pb, whereas the expected transition of γ-softness to sphericity towards N=126 is probed in 200Pt.
[1] T. Stetz, H. Mayr et al., Phys. Rev. C 112, 034325 (2025).
[2] C.M. Nickel, V. Werner et al., Phys. Rev. C. (2025, accepted).
[3] C.M. Nickel, V. Werner et al., Phys. Rev. C. (2025, submitted).
*Supported by BMBF (Grant Nos. 05P21RDCI2 and 05P24RD3) and by DFG (GRK 2128 ’Accelence’, IRTG 2891 ’Nuclear Photonics’ and INST 216/988-1 FUGG).
Keywords: 200Pt; 210Pb; RDDS; Two-neutron transfer; Lifetime measurement