9 research outputs found
Nuclear astrophysics with radioactive ions at FAIR
The nucleosynthesis of elements beyond iron is dominated by neutron captures
in the s and r processes. However, 32 stable, proton-rich isotopes cannot be formed during
those processes, because they are shielded from the s-process
ow and r-process -decay chains.
These nuclei are attributed to the p and rp process.
For all those processes, current research in nuclear astrophysics addresses the need for more
precise reaction data involving radioactive isotopes. Depending on the particular reaction, direct
or inverse kinematics, forward or time-reversed direction are investigated to determine or at least
to constrain the desired reaction cross sections.
The Facility for Antiproton and Ion Research (FAIR) will o er unique, unprecedented
opportunities to investigate many of the important reactions. The high yield of radioactive
isotopes, even far away from the valley of stability, allows the investigation of isotopes involved
in processes as exotic as the r or rp processes
Interaction of 8He with 208Pb at near-barrier energies: 4He and 6He production
Angular distributions for the inclusive 4He and 6He production cross sections in the 8He+208Pb system at incident energies of 16 and 22 MeV measured at the SPIRAL facility of the GANIL laboratory are presented. Using a combination of kinematical arguments and distorted wave Born approximation (DWBA) calculations, neutron transfer reactions were inferred to be the dominant contributors to both inclusive cross sections. Model-dependent values for the ratios of two- to one-neutron stripping, s2n/s1n, were derived and compared with previous results for 8He and 6He projectiles incident on other heavy targets. Three- and four-neutron stripping were inferred to be the main processes leading to 4He production, although the exact mechanism remains to be elucidated.The authors would like to thank the staff of the GANIL accelerator facility for providing the high-quality 8He beam. This work was supported in part by Grants No. FPA-2010-22131-CO2-01 (FINURA) and No. FPA2013-47327-C2-1-R from the Spanish Ministry of Economy and Competitiveness, UNAM-PAPIIT IA103218 (Mexico); Grant No. N202 033637 from the Ministry of Science and Higher Education of Poland; the National Science Centre of Poland under Contracts No. 2013/08/M/ST2/00257 (LEA-COPIGAL) and No. 2014/14/M/ST2/00738 (COPIN-INFN Collaboration); and Grant No. EUI2009-04163432 (EUROGENESIS) from the European Science Foundation
Sub-barrier fusion of 6He with 206Pb
Cross-sections for the production of 210Po nuclei in 6He + 206Pb collisions over the incident
energy range 14–18MeV were measured by means of the activation technique and a radiochemical analysis.
The elastic scattering at 18.0MeV was also measured providing a precise value for the 210Po production
cross-section at this energy. The results are at variance with the earlier experimental data and rather in
accord with the predictions of a density-dependent barrier penetration model for the fusion process. A
proper treatment of beam energy distribution for the evaluation of the activation data is discussed
Breakup and neutron-transfer effects on 6He+206Pb elastic scattering below the Coulomb barrier
The elastic scattering and inclusive α-particle yield for the 6He + 206Pb system at an incident energy of
18 MeV, just below the nominal Coulomb barrier, have been measured. The α-particle yield at forward
angles is also reported. The data are analyzed by means of continuum-discretized coupled-channels, distorted
wave Born approximation, and coupled reaction channels calculations. Couplings to the one-neutron- and
two-neutron-transfer reactions are found to be able to account for most of the absorption in the entrance channel.This work was supported in part by Grant No. FPA2010-22131-C02-01 from the Spanish Ministry of Science.Departamento de Física AplicadaDepartamento de Ingeniería Eléctrica y Térmic
Near barrier scattering of 8He on 208Pb
The exotic nucleus 8He is investigated by means of the measurement of the
angular distributions of the elastic channel and the 6He and 4He fragment yields produced
in the collision with a 208Pb target at two energies around the Coulomb barrier, 16 and
22 MeV. The experiment was performed at the GANIL-SPIRAL facility, with the aim of
extracting information about the structure of 8He and the relevant reaction mechanisms.
In this contribution, details of the experimental setup and preliminary data on elastic cross
sections are reported
Study of the Near-barrier Scattering of (8) He on (208) Pb
Presented at the XXXIV Mazurian Lakes Conference on Physics, Piaski, Poland,
September 6–13, 2015.The structure and dynamics of
8
He have been studied through the col-
lision process with a
208
Pb target at energies of 22 and 16 MeV, above
and below the Coulomb barrier, respectively. The energy and angular dis-
tributions of the elastically scattered
8
He and the
6
;
4
He fragments were
measured. In this paper, we discuss the method used to determine the ef-
fective position of the beam spot on the reaction target and the scattering
and solid angles of each pixel of the detector array.This work was supported in part by grants FPA2010-22131-C021-01 and
FPA2014-59954-C3-1-P from the Spanish Ministry of Economy and Com-
petitiveness, grant N202 033637 from the Ministry of Science and Higher
Education of Poland and Contract EUI2009-04163 (EUROGENESIS) from
the European Science Foundation.This work was supported in part by grants FPA2010-22131-C021-01 and FPA2014-59954-C3-1-P from the Spanish Ministry of Economy and Competitiveness, grant N202 033637 from the Ministry of Science and Higher Education of Poland and Contract EUI2009-04163 (EUROGENESIS) from the European Science Foundation
An innovative Superconducting Recoil Separator for HIE-ISOLDE
The ISOLDE Scientific Infrastructure at CERN offers a unique range of post-accelerated radioactive beams. The scientific program can be improved with the “Isolde Superconducting Recoil Separator” (ISRS), an innovative spectrometer able to deliver unprecedented (A, Z) resolution. In this paper we present an overview of the physics and ongoing technical developments.Work partially funded by the Grant PID2021-127711NB-I00 (Spanish Ministry of Science and Innovation, Spain), the Recovery and Resilience Facility (Spain), and the European Union – Next Generation EU funds.Departamento de Física Aplicad
Elastic scattering of 8He + 208Pb at 22 MeV
The dynamics of 8He around the Coulomb barrier is investigated by measuring the energy and angular distribution of the elastic 8He and the 6He and 4He fragment yields in the collision process with a 208Pb target. The experiment was carried out at SPIRAL/GANIL in October 2010. The experimental results will provide information about the relevant reaction mechanisms and the validity of the optical model (OM) when applied to exotic nuclei. In this paper, details of the experimental setup and preliminary results on the elastic scattering for the collision at 22 MeV are presented