Discovery of
Neutron halo
Neutron drip line
9
7Be
Be
10
Be 11
12
Be
Be
Be
6
3
1
H
He
2
1
H
4
Li
He
3
7
Li
6
He
8
Li
9
Li
8
He
H
n
Fig. 1. 8 The neutron halo and
neutron skins were discovered from
the measurements of matter radii.
The discovery of 10 He proves that a
radioactive nuclear beam is effective
for production of exotic nuclei and
nuclei beyond the driplines.
Discovery of
Neutron skin
14
11
Li
Discovery
of 10 He