CLUSTER-TRANSFER REACTIONS WITH RADIOACTIVE BEAMS: A SPECTROSCOPIC TOOL FOR NEUTRON-RICH NUCLEI
Tesi di Dottorato
Data di Pubblicazione:
2015
Citazione:
CLUSTER-TRANSFER REACTIONS WITH RADIOACTIVE BEAMS: A SPECTROSCOPIC TOOL FOR NEUTRON-RICH NUCLEI / S. Bottoni ; tutor: S. Leoni ; tutor esterno: R. Raabe ; co-tutore: A. Bracco. DIPARTIMENTO DI FISICA, 2015 Jan 26. 27. ciclo, Anno Accademico 2014. [10.13130/bottoni-simone_phd2015-01-26].
Abstract:
In this thesis work, an exploratory experiment to investigate cluster-transfer reactions
with radioactive beams in inverse kinematics is presented. The aim of the experiment
was to test the potential of cluster-transfer reactions at the Coulomb barrier, as a possible
mean to perform spectroscopy studies of exotic neutron-rich nuclei at medium-high
energies and spins. The experiment was performed at ISOLDE (CERN), employing
the heavy-ion reaction 98Rb+7Li at 2.85 MeV/A. Cluster-transfer reaction channels were
studied through particle-gamma coincidence measurements, using the MINIBALL Ge array
coupled to the charged particle Si detectors T-REX. Sr, Y and Zr neutron-rich nuclei
with A around100 were populated by either triton- or alpha-transfer from 7Li to the beam nuclei
and the emitted complementary charged fragment was detected in coincidence with
the gamma cascade of the residues, after few neutrons evaporation. The measured
gamma spectra were studied in detail and the residue distributions were investigated as a function
of the excitation energy and different spin distributions of the nuclei produced in the
cluster-transfer process. Moreover, the reaction mechanism was qualitatively studied
as a two-body process, considering the direct transfer of a cluster-like particle and using
a Distorted Wave Born Approximation (DWBA). The results of this work show that
cluster-transfer reactions can be well described as a direct process and that they could
be considered for the population of neutron-rich nuclei at medium-high energies and
spins. The same experimental technique can therefore be used in future experiments to
study different exotic regions of the nuclides chart using radioactive ion beams of new
generation.
Tipologia IRIS:
Tesi di dottorato
Elenco autori:
S. Bottoni
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