Neutron Halo and Breakup Reactions

Correlated two-neutron emission in the decay of the unbound nucleus <span class="aps-inline-formula"><math><msup><mrow></mrow><mn>26</mn></msup><mi mathvariant="normal">O</mi></math></span>

“…For 16 Be and 13 Li, the experimental angular distributions show an enhancement of emission with relatively small opening angles [23,28]. It has yet to be clarified why these nuclei show different angular distributions from 26 O (and from 6 Be and 11 Li).…”

“…It has been observed that the ionization rate is significantly enhanced due to the electronic correlation, and moreover, there is a strong momentum correlation between the two emitted electrons. The corresponding experiment in nuclear physics is the Coulomb breakup of the Borromean nuclei 11 Li and 6 He, in which those nuclei are broken up to the core nuclei, 9 Li and 4 He, and two neutrons in the Coulomb field of a target nucleus [14][15][16]. The observed breakup probabilities, especially those for the 11 Li nucleus, show a sharp peak in the low-energy region, which can be accounted for only by taking into account the neutron-neutron correlations.…”

“…An attractive feature of this phenomenon is that the two valence protons are emitted without an influence of disturbance of nuclei due to an external field. Very recently, the ground state two-neutron emission was discovered for 16 Be [23]. Earlier measurements on the two-neutron emission include those for 10 He [24] and 13 Li [24,25].…”

Determining the7Li(n,γ) cross section via Coulomb dissociation of8Li

“…It is well established that Coulomb dissociation cross sections can provide nuclear structure information about neutron-rich nuclei [1,2]. In nuclear astrophysics, neutron capture cross sections (σ n,γ ) on radioactive nuclei are important in nucleogenesis, and a cross-section measurement of the inverse reaction, Coulomb dissociation [3,4], might be the only way to obtain the capture cross sections.…”

From the Stable to the Exotic: Clustering in Light Nuclei

“…This exotic behavior has been perfectly illustrated by the famous "Ikeda-diagram" for N =Z nuclei in 1968 [9], which has been recently modified and extended by von Oertzen [10] for neutron-rich nuclei, as shown in the left panel of Fig.2. Clustering is a general feature [11] not only observed in light neutron-rich nuclei [12], but also in halo nuclei such as 11 Li [13] or 14 Be, for instance [14]. The problem of cluster formation has also been treated extensively for very heavy systems by R.G.…”