Abstract
We measured absolute cross sections for neutron transfer channels populated in the Rb94+Pb208 binary reaction. Cross sections have been extracted identifying directly the lead isotopes with the high efficiency MINIBALL γ-ray array coupled to a particle detector combined with a radioactive Rb94 beam delivered at Elab=6.2 MeV/nucleon by the HIE-ISOLDE facility. We observed sizable cross sections in the neutron-rich mass region, where the heavy partner acquires neutrons. A fair agreement between the measured cross sections with those from GRAZING calculations gives confidence in the cross-section predictions of more neutron-rich nuclei produced via a larger number of transferred nucleons.
Highlights
Due to the growing availability of radioactive beams with suitable intensities there is presently an increasing interest in the study of reaction mechanisms which favor the production of neutron-rich heavy nuclei
The balance of Q values is mostly controlled by the light partner, and with stable nuclei the dominant processes are the neutron pick-up and the proton stripping from the light partner of the reaction
The experimental cross sections for the Pb isotopes deduced in the way described in the previous section are reported in Fig. 7, along with the values corresponding to the γ yields directly extracted from the experiment and those where the estimated cross sections to the ground states of Pb isotopes have been added
Summary
Due to the growing availability of radioactive beams with suitable intensities there is presently an increasing interest in the study of reaction mechanisms which favor the production of neutron-rich heavy nuclei. The particular isotope of each element in the nuclear chart where the transition from one regime to the other occurs has been identified by systematic calculations of low-energy direct reactions [2] These isotopes turn out to be somewhere between five to seven neutrons away from the last stable ones, highlighting the importance of the use of neutron-rich projectiles significantly far from stability. To properly test these predictions is a difficult task because it requires the identification of heavy reaction partners by their mass and charge after production with low-intensity radioactive ions. This is the main reason why calculations describe the experimental cross sections extracted in measurements with stable beams well (see Ref. [11] and references therein)
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