Halo Structure of the Island of Inversion Nucleus 31Ne
T. Nakamura
,
N. Kobayashi
,
Y. Kondo
,
Y. Satou
,
N. Aoi
,
H. Baba
,
S. Deguchi
,
N. Fukuda
,
J. Gibelin
(1)
,
N. Inabe
,
M. Ishihara
,
D. Kameda
,
Y. Kawada
,
T. Kubo
,
K. Kusaka
,
A. Mengoni
,
T. Motobayashi
,
T. Ohnishi
,
M. Ohtake
,
N.A. Orr
(1)
,
H. Otsu
,
T. Otsuka
,
A. Saito
,
H. Sakurai
,
S. Shimoura
,
T. Sumikama
,
H. Takeda
,
E. Takeshita
,
M. Takechi
,
S. Takeuchi
,
K. Tanaka
,
K.N. Tanaka
,
N. Tanaka
,
Y. Togano
,
Y. Utsuno
,
K. Yoneda
,
A. Yoshida
,
K. Yoshida
T. Nakamura
- Function : Author
N. Kobayashi
- Function : Author
Y. Kondo
- Function : Author
Y. Satou
- Function : Author
N. Aoi
- Function : Author
H. Baba
- Function : Author
S. Deguchi
- Function : Author
N. Fukuda
- Function : Author
J. Gibelin
- Function : Author
- PersonId : 11987
- IdHAL : julien-gibelin
- ORCID : 0000-0001-6751-3714
- IdRef : 105736708
N. Inabe
- Function : Author
M. Ishihara
- Function : Author
D. Kameda
- Function : Author
Y. Kawada
- Function : Author
T. Kubo
- Function : Author
K. Kusaka
- Function : Author
A. Mengoni
- Function : Author
T. Motobayashi
- Function : Author
T. Ohnishi
- Function : Author
M. Ohtake
- Function : Author
N.A. Orr
- Function : Author
- PersonId : 940479
- ORCID : 0000-0002-8499-8693
H. Otsu
- Function : Author
T. Otsuka
- Function : Author
A. Saito
- Function : Author
H. Sakurai
- Function : Author
- PersonId : 755357
- ORCID : 0000-0002-6215-4254
S. Shimoura
- Function : Author
T. Sumikama
- Function : Author
- PersonId : 757885
- ORCID : 0000-0002-7262-5339
H. Takeda
- Function : Author
E. Takeshita
- Function : Author
M. Takechi
- Function : Author
S. Takeuchi
- Function : Author
K. Tanaka
- Function : Author
K.N. Tanaka
- Function : Author
N. Tanaka
- Function : Author
Y. Togano
- Function : Author
Y. Utsuno
- Function : Author
K. Yoneda
- Function : Author
A. Yoshida
- Function : Author
K. Yoshida
- Function : Author
Abstract
The cross sections for single-neutron removal from the very neutron-rich nucleus 31Ne on Pb and C targets have been measured at 230 MeV=nucleon using the RIBF facility at RIKEN. The deduced large Coulomb breakup cross section of 540(70) mb is indicative of a soft E1 excitation. Comparison with direct-breakup model calculations suggests that the valence neutron of 31Ne occupies a low-‘ orbital (most probably 2p3=2) with a small separation energy (Sn & 0:8 MeV), instead of being predominantly in the 1f7=2 orbital as expected from the conventional shell ordering. These findings suggest that 31Ne is the heaviest halo system known.