[en] The neutron halo nuclei characterized by very large matter radii, small separation energy and small internal momentum of the valence neutrons, were discovered by Tanihata and co-workers. Until now, the halo nuclei were investigated mostly by elastic, inelastic scattering and breakup processes. It was recently predicted, that due to the very large dimension of ¹¹ Li, one may expect, that in a fusion experiment on a light target, the valence neutrons will not be absorbed together with the ⁹ Li core, but will be emitted in the early stage of the reaction process. The first experiment aiming to check this expectation, was performed at the RIKEN-RIPS facility. In the experimental setup, the MUSIC chamber, achieved in the frame of IFIN-HH - RIKEN cooperation, played an important role. The obtained results confirm the prediction, indicating to a novel pre-emission effect (near 40 %, for one or two neutrons). The pre-emission of neutron pairs was investigated by time-position coincidences. It is considered that the pre-emission of neutron pairs is responsible for the experimentally observed strong neutron focusing effect. An experiment aiming to a large number of n-n coincidences, based on a new neutron array detector built in the frame of IFIN-HH - RIKEN cooperation, is in preparation. A model for the pre-emission probabilities calculations has been also worked out. Good agreement with the experimental data has been obtained. (author)

[en] Target residues from the interaction of copper with 90 MeV/nucleon ⁶Li ions have been studied utilizing thick-target, thick-catcher recoil range techniques. Cross sections, average forward ranges, and forward-to-backward ratios have been measured. Isobaric and mass yield distributions have been constructed from the cross section data. Longitudinal momentum transfer information has been obtained. Comparison with a variety of lighter and heavier projectiles interacting with copper have been made. Comparisons of the data with initial interaction-evaporation models ISABELLE-EVA, BUU-GEMINI, and BUU-PACE are presented

[en] A microscopic single-scattering model study of elastic scattering of ⁹Li from protons at 60 MeV/nucleon is reported. Results with two realistic effective nucleon-nucleon interactions, one adopted from the work of Mahaux and collaborators and another from the work of von Geramb and collaborators, bracket the σ(θ) data when a simple Gaussian ground state density with rms radius 2.32 fm is used. copyright 1997 The American Physical Society

[en] ISOLDE is the CERN facility dedicated to the production of radioactive ion beams for many different experiments in the fields of nuclear and atomic physics, materials science and life sciences. The ISOL method involves in this case the bombardment of a thick target with an intense proton beam, producing high yields of exotic nuclei with half-lives down to the millisecond range. By a clever combination of target and ion source units pure beams of over 1000 different nuclei of 74 elements have been produced and delivered to experiments where properties of the nuclei such as masses, radii, decay modes, structure and shapes are determined. This year ISOLDE celebrates its 50 anniversary of production of radioactive beams offering the largest variety of post accelerated radioactive beams in the world today. The HIE ISOLDE upgrade (HIE stands for High Intensity and Energy), intends to improve the experimental capabilities at ISOLDE over a wide front. The main feature is to boost the energy of the beams, going in steps from previous 3 MeV/u via 5.5 MeV/u to finally 10 MeV/u, and to accommodate a roughly fourfold increase in intensity. In 2016 Physics with 5.5 MeV/u for A/q = 4.5 was available and six experiments were done with beams from "9Li to "1"4"2Xe and energies up to 6.8 MeV/u in the case of "9Li were achieved. In this contribution highlights from ISOLDE and from the HIE-ISOLDE project will be presented. (author)

[en] In this paper, we extend the above work further to loosely bound "9Li projectile on stable "2"0"8Pb target, forming "2"1"7At. We are able to fit the total cross section σ_f_u_s at one value of ΔR, but, in addition, we find that, instead of CN, the nCN is contributing most towards the total fusion cross section

[en] One of the most active areas of research with radioactive beams is the study of the fusion of weakly bound nuclei, such as the halo nuclei. The central issue is whether the fusion cross section will be enhanced due to the large nuclear size of the halo nucleus or whether fusion-limiting breakup of the weakly bound valence nucleons will lead to a decreased fusion cross section. The fusion of "9","1"1Li with "2"0"8Pb were reported. These measurements were carried out at TRIUMF, Canada. These measurements suggests at above barrier energies, fusion hindrance is taking place in the case of "1"1Li projectile. However, sub barrier fusion measurement need a lower energy measurement. These measurements also suggest need for further measurement of transfer and breakup channels in these reactions. So we suggest a measurement of multi nucleon transfer in the case of "9Li + "2"0"8Pb. Also, these measurement will be able to produce the same nuclei as suggested in the ISOLDE experiment by, where "2"1"2","2"1"4Pb and "2"0"8","2"1"0Hg nuclei for studying the spectroscopy of these nuclei. (author)

[en] Sub-barrier fusion cross sections for the ⁹Li+⁷⁰Zn system are analyzed within the framework of the coupled channels model. We find that inclusion of the inelastic and one-neutron transfer channels in the coupled-channels calculations fails to reproduce the data. We find that possible formation of a molecular bond accompanied by two-neutron transfer may account for the observed behavior.

[en] The present state and the plan of the experiment of measuring the fusion reaction near barriers by using neutron-excess nucleus beam, which has been advanced at RIKEN are reported. One of the purposes of this experiment is the feasibility investigation of the fusion reaction by using neutron-excess nuclei, which is indispensable for synthesizing superheavy elements. It is intended to systematically explore some enhancing mechanism in the neutron-excess nuclei which are unfavorable in beam intensity. This research can become the good means to prove the dynamic behavior of the neutrons on the surfaces of nuclei in reaction. The fusion reaction of ²⁷Al + Au was measured by using the stable nucleus beam of ²⁷Al, and the results are shown. In order to know the low energy fusion reaction of ¹¹Li and ¹¹Be which are typical halo nuclei, the identification by characteristic α ray of composite nuclei is carried out in ^7,9,11Li + ²⁰⁹Bi and ^9,10,11Be + ²⁰⁸Pb. A new detector having high performance, New MUSIC, is being developed. As the experiment by using this detector, the efficient measurement of the fusion reaction by using heavy neutron-excess nuclei up to Ni is considered. An example of ⁸Li + α → ¹¹B + n reaction for celestial body physics is mentioned. (K.I.)

[en] The elastic scattering of ⁹Li+¹²C and ¹¹Li+¹²C has been measured at an incident energy of 50 MeV per nucleon over the angular range from 2 deg. to 15 deg. in the center-of-momentum frame. The elastic and inelastic reaction channels were cleanly separated in the critical forward-angle region where a predicted nearside/far-side interference minimum should be observed. The angular distributions obtained in this experiment are consistent with existing quasielastic measurements at 60 MeV per nucleon. In particular, the ⁹Li data display the interference minimum, while it is absent for ¹¹Li. This difference is shown to occur in the elastic channel, and the results are discussed in terms of strongly enhanced surface refraction in the ¹¹Li case

[en] The fusion excitation function for ⁹Li + ⁷⁰Zn and ⁹Li + ²⁰⁸Pb systems were measured for near barrier energies using ISAC1 and ISAC2 facilities at TRIUMF. The α emitting evaporation residues (^211-214At) were stopped in the ²⁰⁸Pb target and their decay was measured. The isotopic yields are in good agreements with the statistical model prediction using HIVAP code. The measured excitation function shows evidence for large enhancements in the sub-barrier energies, which is not accounted by current theoretical models. Also, suppression of the above barrier cross section with respect to these theoretical models have been seen. The implication of these measurement for studying the fusion of ¹¹Li with ²⁰⁸Pb will be discussed