Probing proton halo effects in the 8B+64Zn collision around the Coulomb barrier

Spartà, R.; Pietro, A. Di; Фігуера, П.; Tengblad, O.; Moro, A. M.; Martel, I.; Fernández‐García, J. P.; Lei, Jin; Acosta, L.; Borge, María José García; Bruni, G.; Cederkäll, J.; Davinson, T.; Ovejas, J. D.; Fraile, L. M.; Galaviz, D.; Jensen, Jørgen Arendt; Jonson, B.; Cognata, M. La; Perea, Á.; Sanchez-Benitez, A. M.; Soić, N.; Víñals, S.

doi:10.1016/j.physletb.2021.136477

Cited by 24 publications

(19 citation statements)

References 67 publications

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“…To date, a few inclusive breakup measurements (only one of the breakup fragments is recorded), namely, 8 B+ 58 Ni 28 , 64 Zn 31 , and 208 Pb 30 , have been reported at energies around the Coulomb barrier. The inclusive angular distributions of the 7 Be core are consistent with continuum discretized coupled channel (CDCC) calculations [30][31][32][33] , indicating the predominance of the elastic breakup (EBU), i.e., all of the outgoing particles are emitted in their ground states. Experiments are desired to verify this conclusion.…”

supporting

confidence: 60%

“…Furthermore, calculations based on the Ichimura-Austern-Vincent (IAV) 31,52 model were performed to evaluate the contributions to the inclusive 7 Be yield from the NEB processes, which include non-capture breakup accompanied by target excitation, proton absorption by the target (incomplete fusion) and proton transfer leading to bound states of 121 Sb. The NEB calculations results as well as the sum of EBU and NEB are displayed in Fig.…”

Section: Angular Distributionsmentioning

confidence: 99%

“…However, it becomes more challenging for incident energies close to the Coulomb barrier, since it is not easy to carry out a coincidence measurement between the breakup fragments as was done at higher energies, due to the much reduced kinematic focusing. Despite the substantial efforts devoted [28][29][30][31] , the low beam intensity and insufficient detection efficiency have prevented so far coincident measurements of the 8 B system. To date, a few inclusive breakup measurements (only one of the breakup fragments is recorded), namely, 8 B+ 58 Ni 28 , 64 Zn 31 , and 208 Pb 30 , have been reported at energies around the Coulomb barrier.…”

mentioning

confidence: 99%

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Breakup of the proton halo nucleus 8B near barrier energies

et al. 2022

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The dynamics of a nuclear open quantum system could be revealed in the correlations between the breakup fragments of halo nuclei. The breakup mechanism of a proton halo nuclear system is of particular interest as the Coulomb polarization may play an important role, which, however, remains an open question. Here we use a highly efficient silicon detector array and measure the correlations between the breakup fragments of 8B incident on 120Sn at near-barrier energies. The energy and angular correlations can be explained by a fully quantum mechanical method based on the state-of-the-art continuum discretized coupled channel calculations. The results indicate that, compared to the neutron halo nucleus 6He, 8B presents distinctive reaction dynamics: the dominance of the elastic breakup. This breakup occurs mainly via the short-lived continuum states, almost exhausts the 7Be yield, indicating the effect of Coulomb polarization on the proton halo state. The correlation information reveals that the prompt breakup mechanism dominates, occurring predominantly on the outgoing trajectory. We also show that, as a large environment, the continuum of 8B breakup may not significantly influence elastic scattering and complete fusion.

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confidence: 60%

Section: Angular Distributionsmentioning

confidence: 99%

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confidence: 99%

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Breakup of the proton halo nucleus 8B near barrier energies

et al. 2022

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“…Moreover, halos/skins have relevant connections with the Equation of State of nuclear matter (EoS), and understanding more about these properties would allow one to provide stronger constraints to the knowledge of the EoS. Beyond the neutron halo, several works also suggest the existence of a proton-halo [11,[13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Radioactive ion beam opportunities at the new FRAISE facility of INFN-LNS

Martorana

Cardella²,

Guazzoni³

et al. 2022

Front. Phys.

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At the Laboratori Nazionali del Sud of INFN (INFN-LNS) in Catania, the construction of the new Radioactive Ion Beams (RIBs) facility FRAISE (FRAgment In-flight SEparator) has reached its ending phase. The facility uses the in-flight technique based on a primary beam fragmentation impinging on light Be or C targets. FRAISE makes use of light and medium mass primary beams, having power up to ≈ 2–3 kW, leading to RIBs, whose intensities vary in the range of ≈ 103–107 pps, for nuclei far from and close to the stability valley, respectively. FRAISE aims at providing high-intensity and high-quality RIBs for nuclear physics experiments, also serving to interdisciplinary research areas, such as medical physics. Critical aspects for high-quality beams are the tuning and transport, representing time-consuming processes and requiring dedicated diagnostics and tagging devices measuring many features of RIBs. Some of these devices should be capable to operate in radioactively activated environments because of the expected 2 kW beam lost in the dipole after the production target. Due to its peculiar robustness to radioactive damage, Silicon Carbide (SiC) technology has been considered for the detection layer. In this view, an R&D campaign has been started aiming at developing the FRAISE facility, the new diagnostics system, and a new tagging device, the latter of which will be useful for the CHIMERA multidetector beamline. In this paper, we discuss the status and the perspectives of the facility with a focus on the RIBs opportunities.

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“…Elastic scattering of 8 B on 64 Zn at much lower energy, close to the Coulomb barrier, was investigated by Sparta et al (2021) using a post-accelerated 8 B beam. The measured data were interpreted with help of the continuum-discretised coupledchannels (CDCC) calculations (Thompson (1988)).…”

mentioning

confidence: 99%

Nuclei near and at the proton dripline

Pfützner¹,

Mazzocchi²

2022

Preprint

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Nuclei in the vicinity of the proton dripline and beyond it are a fascinating realm within the chart of nuclei. In this chapter the main phenomena that characterise this domain and are not to be found elsewhere are explored. While moving away from the β -stability valley towards the proton dripline, phenomena like very exotic decay modes such as β -delayed (multi-) particle emission, and proton-, or two-proton radioactivity are encountered. Landmark nuclei are here two isotopes with magic proton and neutron numbers, 48 Ni and 100 Sn. Moreover, proton-rich nuclei (N < Z) display other interesting features, like breaking of isospin symmetry with consequent asymmetry in the energy spectra between mirror nuclei, the so-called Thomas-Ehrmann shift, or the phenomenon of proton-halo. Last but not least, nuclei close to the proton dripline play a very important role in nucleosynthesis, since they take part in the rapid-proton capture process and their properties are crucial in defining the flow followed and its termination close to 100 Sn.

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Probing proton halo effects in the 8B+64Zn collision around the Coulomb barrier

Cited by 24 publications

References 67 publications

Breakup of the proton halo nucleus 8B near barrier energies

Breakup of the proton halo nucleus 8B near barrier energies

Radioactive ion beam opportunities at the new FRAISE facility of INFN-LNS

Nuclei near and at the proton dripline

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