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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Structure and Dynamics of Nuclei III

HK 7.2: Vortrag

Montag, 10. März 2025, 17:00–17:15, HS 2 Physik

Measurement of the lifetimes of excited states in 56Ti, 58Ti — •Wiktor Poklepa for the HiCARI collaboration — GSI Helmoltzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany

The neutron-rich Ti isotopes lie within the interests of nuclear physicists for several reasons. One of them is the region of validity of the new neutron magic numbers N=32,34 observed in the Ca isotopic chain. The other is approaching the island of inversion around N=40 with the most exotic Ti isotopes. The E(2₁⁺) energies for even-even Ti isotopes have been measured up to N=40 and, unlike in Ca and Ar isotopes with N=34, there is no rise of E(2₁⁺) for ⁵⁶Ti. At the same time the B(E2) values for this set of isotopes have been established only up to N=34. The currently known trend in B(E2) values in Ti isotopes shows staggering behaviour, but experimental uncertainties are too large to draw conclusions on the onset of collectivity towards N=40. Thus, further investigation is needed. In this experiment, the lifetimes of excited states in ^56,58Ti were studied employing proton knockout reactions from ^57,59V at the RIBF facility in Japan. The secondary beams produced from ⁷⁰Zn at 345 MeV/u were transported through the BigRIPS spectrometer. Gamma rays emitted by the reaction products were detected by the HiCARI HPGe detector array. The reaction products were identified using the ZeroDegree spectrometer. In this talk, the first preliminary results on the spectroscopy and lifetime measurements for ^56,58Ti will be presented.

Keywords: neutron-rich Ti isotopes; HiCARI experiment; BigRIPS; lifetime measurements; island of inversion