Περίληψη:
Background: Nucleon transfer reactions are selective tools for nuclear
physics investigations. The theoretical and computational limits
affecting in the past their data analysis could be nowadays surmounted
thanks to the advent of methods with refined approximations and
constraints, even when heavy-ion collisions are considered.
Purpose: Modern microscopic calculations of heavy-ion-induced transfer
reactions combined with precise experimental data offer the chance for
accurately testing different reaction models as well as the nuclear
structure description of the involved nuclear states.
Method: Single proton and neutron transfer reactions were measured with
the MAGNEX magnetic spectrometer for the O-18 + Ca-40 system at 15.3A
MeV. Excitation energy spectra and angular differential cross section
distributions were extracted. The experimental results are compared with
theoretical calculations performed in distorted wave and coupled channel
Born approximation. The use of a coupled channel equivalent polarization
potential to effectively describe the coupling effects affecting the
initial state interaction is also considered. Spectroscopic amplitudes
derived from a large-scale shell model with appropriate interactions
adapted for the involved nuclei are employed.
Results: Our theoretical calculations are in good agreement with
experimental data, without the need for any scaling factor, validating
the adopted reaction and nuclear structure parameters. Moreover, under
the present experimental conditions, a weak dependence of the obtained
results on the choice of the reaction models was observed.
Conclusions: The good agreement between experimental and theoretical
results validates the reliability of the parameter sets entering the
calculations. They are extracted from or tested in complementary
analyses of other reaction channels under the same experimental
conditions. Such a multichannel approach represents the best option to
pursue a solid, comprehensive, and model-independent description of the
single-nucleon transfer reactions. The successful description of the
present one-nucleon transfer data is also propaedeutic to the accurate
assessment, under the same theoretical description, of higher-order
transfer processes, like the sequential nucleon transfer mechanisms
which are in competition with the direct charge exchange reactions.
Συγγραφείς:
Calabrese, S.
Cavallaro, M.
Carbone, D.
Cappuzzello, F. and
Agodi, C.
Burrello, S.
De Gregorio, G.
Ferreira, J. L. and
Gargano, A.
Sgouros, O.
Acosta, L.
Amador-Valenzuela, P. and
Bellone, J. I.
Borello-Lewin, T.
Brischetto, G. A.
Calvo, D.
and Capirossi, V.
Lomeli, E. R. Chavez
Ciraldo, I.
Colonna,
M.
Delaunay, F.
Djapo, H.
Eke, C.
Finocchiaro, P. and
Firat, S.
Fisichella, M.
Foti, A.
Guazzelli, M. A. and
Hacisalihoglu, A.
Iazzi, F.
La Fauci, L.
Lay, J. A. and
Linares, R.
Lubian, J.
Medina, N. H.
Moralles, M. and
Oliveira, J. R. B.
Pakou, A.
Pandola, L.
Petrascu, H. and
Pinna, F.
Russo, G.
Solakci, S. O.
Soukeras, V. and
Souliotis, G.
Spatafora, A.
Torresi, D.
Tudisco, S. and
Yildirim, A.
Zagatto, V. A. B.
NUMEN Collaboration
