Interference effects between direct and sequential processes in the (<sup>18</sup>O,<sup>16</sup>O) reaction

Cavallaro, M.; Cappuzzello, F.; Bondí, M.; Carbone, D.; Garcia, V. N.; Gargano, A.; Lenzi, S. M.; Lubián, J.; Agodi, C.; Azaiez, F.; Napoli, M. De; Foti, A.; Franchoo, S.; Linares, R.; Nicolosi, D.; Nııkura, M.; Scarpaci, J. A.; Tropea, S.

doi:10.1051/epjconf/20146603017

Cited by 9 publications

(22 citation statements)

References 19 publications

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“…The two-step sequential transfer calculations account only for a minor contribution to the absolute cross section, justifying a posteriori the approximated approach to separate the sequential transfer from the CRC calculations. Interference effects between direct and sequential processes were found to be important to describe the deep minima of the ground state angular distribution [93].…”

Section: Reaction Mechanisms In Heavy-ion Transfer Reactionsmentioning

confidence: 99%

The MAGNEX spectrometer: Results and perspectives

et al. 2016

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This article discusses the main achievements and future perspectives of the MAGNEX spectrometer at the INFN-LNS laboratory in Catania (Italy). MAGNEX is a large acceptance magnetic spectrometer for the detection of the ions emitted in nuclear collisions below Fermi energy. In the first part of the paper an overview of the MAGNEX features is presented. The successful application to the precise reconstruction of the momentum vector, to the identification of the ion masses and to the determination of the transport efficiency is demonstrated by in-beam tests. In the second part, an overview of the most relevant scientific achievements is given. Results from nuclear elastic and inelastic scattering as well as from transfer and charge exchange reactions in a wide range of masses of the colliding systems and incident energies are shown. The role of MAGNEX in solving old and new puzzles in nuclear structure and direct reaction mechanisms is emphasized. One example is the recently observed signature of the long searched Giant Pairing Vibration. Finally, the new challenging opportunities to use MAGNEX for future experiments are briefly reported. In particular, the use of double charge exchange reactions toward the determination of the nuclear matrix elements entering in the expression of the half-life of neutrinoless double beta decay is discussed. The new NUMEN project of INFN, aiming at these investigations, is introduced. The challenges connected to the major technical upgrade required by the project in order to investigate rare processes under high fluxes of detected heavy ions are outlined. Magnetic spectrometers in Nuclear Reaction studies .

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Section: Reaction Mechanisms In Heavy-ion Transfer Reactionsmentioning

confidence: 99%

The MAGNEX spectrometer: Results and perspectives

et al. 2016

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“…The ( 18 O, 16 O) reaction is also an effective probe to access two-neutron pairing configurations, since the two-neutron system is pre-formed in the 18 O nucleus and the beam production is straightforward. The systematic investigation using the ( 18 O, 16 O) transfer reactions at the same bombarding energies have been published recently [6][7][8][9][10][11][12][13][14][15]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Competition between direct and sequential two-neutron transfers in the O18+Si28 collision at 84 MeV

et al. 2018

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In this work we study the simultaneous and sequential two-neutron transfer mechanisms to the 28 Si nucleus induced by (t,p) and ( 18 O, 16 O) reactions. New experimental cross sections for the 28 Si( 18 O, 16 O) 30 Si reaction at 84 MeV are also presented. Direct reaction calculations are carried out within the Exact Finite Range Coupled Reaction Channel, for the simultaneous transfer of the two-neutron cluster, and the second order Distorted Wave Born Approximation, for the sequential transfer. Two different models are considered to describe the two-neutron cluster. The spectroscopic information was obtained from shell model calculation with psdmod interaction for the target overlaps where the 1p 3/2 , 1p 1/2 , 1d 3/2 , 1d 5/2 and 2s 1/2 orbitals are included as valence sub-space. We show that simultaneous and sequential two-neutron transfer are competing mechanisms for the population of the ground state in 30 Si. A systematic analysis of the two-neutron transfer induced by the ( 18 O, 16 O) indicates that static deformation of target nuclei impacts on the two-neutron transfer mechanism.

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“…Recently, in Refs. [3,16,24,25] the experimental cross sections for the two-neutron transfer reactions 12 C( 18 O, 16 O) 14 C, 16 O( 18 O, 16 O) 18 O, and 13 C( 18 O, 16 O) 15 C were reproduced without any free parameters. In several previous works calculations for the two-neutron transfer reaction ( 18 O, 16 O) on various target nuclei were performed.…”

Section: Introductionmentioning

confidence: 99%

Long-range versus short-range correlations in the two-neutron transfer reaction Ni64(O18,O
Paes
¹
,
Santagati
²
,
Vsevolodovna
³

et al. 2017
Phys. Rev. C
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Recently, various two-neutron transfer studies using the (18 O, 16 O) reaction were performed with a large success. This was achieved because of a combined use of the microscopic quantum description of the reaction mechanism and of the nuclear structure. In the present work we use this methodology to study the two-neutron transfer reaction of the 18 O + 64 Ni system at 84 MeV incident energy, to the ground and first 2 + excited state of the residual 66 Ni nucleus. All the experimental data were measured by the large acceptance MAGNEX spectrometer at the Instituto Nazionale di Fisica Nucleare-Laboratori Nazionali del Sud (Italy). We have performed exact finite range cross section calculations using the coupled channel Born approximation (CCBA) and coupled reaction channel (CRC) method for the sequential and direct two-neutron transfers, respectively. Moreover, this is the first time that the formalism of the microscopic interaction boson model (IBM-2) was applied to a two-neutron transfer reaction. From our results we conclude that for two-neutron transfer to the ground state of 66 Ni, the direct transfer is the dominant reaction mechanism, whereas for the transfer to the first excited state of 66 Ni, the sequential process dominates. A competition between long-range and short-range correlations is discussed, in particular, how the use of two different models (Shell model and IBM's) help to disentangle long-and short-range correlations.

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Interference effects between direct and sequential processes in the (¹⁸O,¹⁶O) reaction

Cited by 9 publications

References 19 publications

The MAGNEX spectrometer: Results and perspectives

The MAGNEX spectrometer: Results and perspectives

Competition between direct and sequential two-neutron transfers in the O18+Si28 collision at 84 MeV

Long-range versus short-range correlations in the two-neutron transfer reaction Ni64(O18,O
Paes
¹
,
Santagati
²
,
Vsevolodovna
³

et al. 2017
Phys. Rev. C
Self Cite
57
6
43
0
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Interference effects between direct and sequential processes in the (18O,16O) reaction

Cited by 9 publications

References 19 publications

The MAGNEX spectrometer: Results and perspectives

The MAGNEX spectrometer: Results and perspectives

Competition between direct and sequential two-neutron transfers in the O18+Si28 collision at 84 MeV

Long-range versus short-range correlations in the two-neutron transfer reaction Ni64(O18,OPaes1, Santagati2, Vsevolodovna3 et al. 2017Phys. Rev. CSelf Cite576430View full textAdd to dashboardCite

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Interference effects between direct and sequential processes in the (¹⁸O,¹⁶O) reaction

Long-range versus short-range correlations in the two-neutron transfer reaction Ni64(O18,O
Paes
¹
,
Santagati
²
,
Vsevolodovna
³

et al. 2017
Phys. Rev. C
Self Cite
57
6
43
0
View full text Add to dashboard Cite