N=16 magicity revealed at the proton drip-line through the study of 35Ca
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)
,
J Pancin
(2)
,
T.Y Saito
,
C Stodel
(2)
,
J-C Thomas
(2)
A Poves
- Fonction : Auteur
D Suzuki
- Fonction : Auteur
A Lemasson
- Fonction : Auteur
- PersonId : 3871
- IdHAL : antoine-lemasson
- ORCID : 0000-0002-9434-8520
- IdRef : 152663169
B.A Brown
- Fonction : Auteur
F Delaunay
- Fonction : Auteur
- PersonId : 740010
- IdHAL : franck-l-delaunay
- ORCID : 0000-0002-1703-2434
- IdRef : 089345819
N Kitamura
- Fonction : Auteur
T.Y Saito
- Fonction : Auteur
Résumé
The last proton bound calcium isotope $^{35}$Ca has been studied for the first time, using the $^{37}$Ca($p, t$)$^{35}$Ca two neutron transfer reaction. The radioactive $^{37}$Ca nuclei, produced by the LISE spectrometer at GANIL, interacted with the protons of the liquid hydrogen target CRYPTA, to produce tritons $t$ that were detected in the MUST2 detector array, in coincidence with the heavy residues Ca or Ar. The atomic mass of $^{35}$Ca and the energy of its first 3/2$^+$ state are reported. A large $N=16$ gap of 4.61(11) MeV is deduced from the mass measurement, which together with other measured properties, makes $^{36}$Ca a doubly-magic nucleus. The $N = 16$ shell gaps in $^{36}$Ca and $^{24}$O are of similar amplitude, at both edges of the valley of stability. This feature is discussed in terms of nuclear forces involved, within state-of-the-art shell model calculations. Even though the global agreement with data is quite convincing, the calculations underestimate the size of the $N = 16$ gap in 36Ca by 840(110) keV.