Halo nuclei, stepping stones across the drip-lines

Structure of the unbound nucleus13Be: One-neutron knockout reaction data from14Be analyzed in a holistic approach

“…The dσ/dE f n spectrum in coincidence with γ rays shows the presence of a decay branch from a 5/2 + state in 13 Be to the 2 + state in 12 Be via emission of an s-wave neutron. In addition, coincidences observed between neutrons and 2.7 MeV γ rays from the 1 − state can be explained as originating in decay from the state at E r = 5.2(1) MeV, = 1.4 (2) MeV. This might be due to s-wave neutron emission from an I π = 3/2 − state.…”

“…There has also been a strong interest in unbound nuclei (for recent reviews see Refs. [2,3]), which in some cases are situated in-between bound nuclei, like 10 Li or even beyond the last bound isotope like, 12,13 Li [4] or 16 Be [5]. It is an experimental challenge to unravel the quantum properties of these unbound systems, which are not trivially distinguished from any debris from the original beam or the subsequent production process.…”

Neutron correlations in the decay of the first excited state of 11Li

“…In particular, a class of nuclei called halo nuclei are usually simplified as a cluster-like few-body problem of a core and halo nucleon(s). The internal structure of the core and the dynamics of the halo nucleons have been studied extensively (see for example [1][2][3]).…”

Experimental study of bound states in12Be through low-energy11Be(d,p)Johansen1, Bildstein2, Borge3 et al. 2013Phys. Rev. C283180View full textAdd to dashboardCite

“…The structure of light neutron-rich nuclei has presented many challenges during the last decades [1], and this area of the nuclear chart is a prime region for investigations of halos [2][3][4], cluster states [5], unbound systems [6,7], as well as the vanishing of shells [8]. A key question in these topics is the spectroscopic composition of the bound states, which can be accessed experimentally in complementary ways [9][10][11].…”