LINESHAPES investigation for the first time using a non-standard PEEK target

Researchers at the Institute of Modern Physics (IMP) have carried out the lineshapes calculations in the 46Ti nucleus for the first time, employing the reaction 12C( 36Ar, 2p) 46Ti to populate the nuclei of interest. Reliable lifetimes of the excited states in the yrast band of 46Ti have been measured and the resulting E2 transitions probabilities are determined.

A number of experiments had been performed in the past employing the different nuclear reactions. The present experiment performed with the non-standard PEEK target has not only provided good statistics but also the precise measurement of the lifetimes of short-lived populated states of interest. Furthermore, the reason of excellent statistics can be given to the presence of the newly upgraded detection array comprising of high volume shielded detectors available at IMP, Lanzhou.

This experiment was conducted by the Superheavy Nuclide and Nuclear Structure group of IMP and their collaborators, employing the Heavy Ion Research Facility in Lanzhou (HIRFL). In this experiment, researchers applied the Doppler Shift Attenuation Method (DSAM) of lifetime measurements to calculate the lineshapes of γ-ray transitions in 46Ti (See Fig. 1).

The role of upper pf orbitals and the mixing of f7/2 and p3/2 orbitals have been discussed to suggest the quadrupole enhancement following the reduction at and above the spin 4+.

Further, the experimentally measured B(E2) values in the present work (46Ti) are observed to be sensitive to the shell-model interactions (GX1A, GX1J, and KB3) and to the model space (Fig. 2).

This work at the IMP-CAS was supported by the Youth Innovation Promotion Association of Chinese Academy of Sciences, the Strategic Priority Research Program of Chinese Academy of Sciences and National Natural Science Foundation of China.

The result was published in Nuclear Physics A on December 4, 2020.

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