Speaker
Description
Deviations from the typical liquid-drop-like saturated density of the nucleus are a focal point in the exploration of nuclear structure. Phenomena of nucleon localisation, such as clustering or bubble structures, provide a distinctive perspective on the macroscopic consequences of nuclear interaction.
We performed a proton-transfer direct reaction to probe the wavefunction of $^{46}$Ar and extrapolated the probability of population of the $d_{3/2}$ hole-state relative to the $s_{1/2}$ in $^{47}$K.
The experiment, performed at the Spiral 1 facility in GANIL with a post-accelerated radioactive $^{46}$Ar beam impinging on a high-density cryogenic $^{3}$He target relied on a state-of-the-art experimental setup for a precise reconstruction of the kinematics of the reaction.
The heavy reaction fragment was identified by the high-acceptance magnetic spectrometer, VAMOS, while the high-granularity silicon DSSSD detector, MUGAST, allowed the measurement of the angular distribution of the light ejectile while also performing particle identification. The AGATA gamma-ray tracking germanium array measured the gamma rays produced by the decay of the $^{47}$K excited states.
Our experimental findings strongly suggest an empty $s_{1/2}$ orbital, corroborated by ab initio calculations, thereby supporting the existence of a bubble phenomenon within this nucleus. This comparison between theory and data serves as a compelling indication of the observed nuclear structure phenomenon.
| session | I. Nuclear Structure and Reactions |
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