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HK: Fachverband Physik der Hadronen und Kerne
HK 14: Structure and Dynamics of Nuclei IV
HK 14.7: Vortrag
Dienstag, 17. März 2026, 18:00–18:15, AM 00.021
Coulomb excitation of 212Ra at HIE-ISOLDE — •H. Mayr1, G. Rainovski2, N. Pietralla1, and V. Werner1 for the ISOLDE IS748 collaboration — 1TU Darmstadt — 2Sofia University, Bulgaria
The generalised seniority scheme is a truncated version of the nuclear shell model [1] applicable to the structure of atomic nuclei in the vicinity of shell closures. The number of unpaired nucleons, the seniority ν, is considered an approximate quantum number. The region of the even-even Po-Rn-Ra nuclei with N=124 exhibits strong signs of seniority-like behaviour, e.g. the energy spacing between yrast states decreases with increasing angular momentum. However, no data is available to confirm or falsify the anticipated parabolically increasing trend in the absolute E2 transition strength with the filling of the j-shell for the Δν=2 seniority-changing 21+→01+ transition [2]. Therefore, a Coulomb-excitation experiment was conducted at HIE-ISOLDE in 2024 in order to obtain the B(E2; 21+→01+) value of 212Ra. The 212Ra beam was impinged on a 120Sn target with 4.5 MeV/u. γ rays of deexciting 212Ra nuclei were observed by the Miniball array [3]. Particles were recorded by a DSSD. The B(E2; 21+→01+) value is deduced from γ-ray yields. The status of the analysis will be presented.
[1] I. Talmi, Nucl. Phys. A 172, 1 (1971).
[2] J. J. Ressler et al., Phys. Rev. C 69, 034317 (2004).
[3] N. Warr et al., Eur. Phys. J. A 49, 40 (2013).
Supported by the BMFTR (05P24RD3, 05P24PKCI1), Horizon Europe (101057511), the ELI-RO programme (RDI/2024-007 ELITE) and the Romanian Ministry of Research and Innovation (PN23210106).
Keywords: ISOLDE; Miniball; CoulEx