Abstract
The inverse-kinematic thick-target method has been used in order to investigate 212Po alpha-structure by the elastic scattering of 208Pb on 4He target. A 208Pb beam, accelerated by the Superconducting Cyclotron (CS) of Laboratori Nazionali del Sud - INFN, at the incident energy of 10.1 A MeV was impinging onto a specifically designed 4He gas cell, two meter long. The gas cell wasacting both as target and as beam degrader, stopping the beam before reaching the alpha-particle detection system placed at 0° with respect to the beam axis. In order to disentangle the elastic contribution from other reaction channels (e.g. inelastic scattering) a microchannel plate was used to measure the Time of Flight(ToF) of both the 208Pb beam particles and the ejectiles along the gas cell. The 208Pbstopping power in the 4He gas target was also measured, as a key ingredient in order to establish theinteraction point inside the gas cell, in turn determining the solid angle covered by the detector. In the following, the experimental technique will be described, and the results of a preliminary data analysis will be shown.
Highlights
The -particle is considered as one of the basic building blocks of nuclei because of its large binding energy [1]
In order to disentangle the elastic contribution from other reaction channels a microchannel plate was used to measure the Time of Flight (ToF) of both the 208Pb beam particles and the ejectiles along the gas cell
The target inverse kinematics (TTIK) resonant elastic scattering method [11,12,13,14] makes use of the sensitivity of the detected recoil yield to the presence of a resonant state in the compound nucleus
Summary
The -particle is considered as one of the basic building blocks of nuclei because of its large binding energy [1] Opposite to this picture is the single particle description of nuclei, based on the hypothesis of a common mean field (shell model). The enhancement of the -decay width in 212Po was studied in [5] and it was found that the larger configuration mixing plays a very important role in the explanation of the width enhancement New interest, from both experimental [6] and theoretical point of view [7,8,9], raised around 212Po and recently a review on alpha-clustering effects in heavy nuclei has been published [10].
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