Structure of under the Coulomb Magnifying Glass
L. Lalanne
(1, 2)
,
O. Sorlin
(2)
,
A. Poves
,
M. Assié
(1)
,
F. Hammache
(1)
,
S. Koyama
(2)
,
D. Suzuki
,
F. Flavigny
(3)
,
V. Girard-Alcindor
(2)
,
A. Lemasson
(2)
,
A. Matta
(3)
,
T. Roger
(2)
,
D. Beaumel
(1)
,
Y. Blumenfeld
(1)
,
B.A. Brown
,
F. de Oliveira Santos
(2)
,
F. Delaunay
(3)
,
N. de Séréville
(1)
,
S. Franchoo
(1)
,
J. Gibelin
(3)
,
J. Guillot
(1)
,
O. Kamalou
(2)
,
N. Kitamura
,
V. Lapoux
(4)
,
B. Mauss
(2)
,
P. Morfouace
(2, 5)
,
M. Niikura
,
J. Pancin
(2)
,
T.Y. Saito
,
C. Stodel
(2)
,
J-C. Thomas
(2)
A. Poves
- Function : Author
- PersonId : 755249
- ORCID : 0000-0001-7539-388X
D. Suzuki
- Function : Author
- PersonId : 748908
- IdHAL : freddy-flavigny
- ORCID : 0000-0003-0050-5677
A. Lemasson
- Function : Author
- PersonId : 3871
- IdHAL : antoine-lemasson
- ORCID : 0000-0002-9434-8520
- IdRef : 152663169
A. Matta
- Function : Author
- PersonId : 738433
- IdHAL : thomas-roger
- ORCID : 0000-0003-4646-5076
B.A. Brown
- Function : Author
F. Delaunay
- Function : Author
- PersonId : 740010
- IdHAL : franck-l-delaunay
- ORCID : 0000-0002-1703-2434
- IdRef : 089345819
N. Kitamura
- Function : Author
P. Morfouace
- Function : Author
- PersonId : 762085
- ORCID : 0000-0002-5940-2667
M. Niikura
- Function : Author
T.Y. Saito
- Function : Author
Abstract
Detailed spectroscopy of the neutron-deficient nucleus was obtained up to 9 MeV using the and the transfer reactions. The radioactive nuclei, produced by the LISE spectrometer at GANIL, interacted with the protons of the liquid hydrogen target CRYPTA, to produce light ejectiles (the deuteron or triton ) that were detected in the MUST2 detector array, in coincidence with the heavy residues identified by a zero-degree detection system. Our main findings are (i) a similar shift in energy for the and states by about , as compared with the mirror nucleus ; (ii) the discovery of an intruder state at 2.83(13) MeV, which appears below the first state, in contradiction with the situation in ; and (iii) a tentative state at 4.83(17) MeV, proposed to exhibit a bubble structure with two neutron vacancies in the orbit. The inversion between the and states is due to the large mirror energy difference (MED) of for the former. This feature is reproduced by shell model calculations, using the valence space, predicting an almost pure intruder nature for the state, with two protons (neutrons) being excited across the magic closure in (). This mirror system has the largest MEDs ever observed, if one excludes the few cases induced by the effect of the continuum.