Abstract
The presence of seniority-like isomers along the Z = 50 isotopic chain have been an experimental limitation to the investigation of the electromagnetic properties of the low-lying states in the light Sn nuclei. Combining a multi-nucleon transfer reaction with the Recoil-Distance Doppler-Shift technique, the lifetimes of the 21+ and 41+ excited states have been directly measured in the neutron-deficient 106, 108Sn isotopes for the very first time. The emitted γ rays were detected by the AGATA array, while the reactionproducts were uniquely identified by the VAMOS++ magnetic spectrometer. The control of the direct feeding of the statesby gating on the Total Kinetic Energy Loss, together with the unique capabilities of the two spectrometers, was crucial for the measurementin 108Sn.
Highlights
The investigation of nuclear structure close to Z = 50 shell closure have been a hot and discussed topic for both theoretical and experimental groups
Thanks to the simultaneous measurement of the angle and of the energy (Ebl) of the beam-like reaction fragments entering in VAMOS++, the Total Kinetic Energy Loss (TKEL) of the reaction can be extracted under the assumption of a binary reaction without particle evaporation
The employment of a multi-nucleon transfer reaction with the plunger device allowed to investigate the electromagnetic properties of the low-lying states close to 100Sn, overcoming the experimental limitations caused by the presence of low-lying isomers
Summary
Thanks to the unusual application of a Multi-Nucleon Transfer (MNT) reaction, that is commonly used to investigate neutron-rich nuclei [20,21,22], together with unprecedented capabilities of the powerful AGATA and VAMOS++ spectrometers, the lifetimes of the 2+1 and 4+1 states in 106,108Sn have been directly measured for the very first time [23].
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