Direct experimental evidence for a multiparticle-hole ground state configuration of deformed Mg-33
Journal article, 2016
The first direct experimental evidence of a multiparticle-hole ground state configuration of the neutron-rich Mg-33 isotope has been obtained via intermediate energy (400 A MeV) Coulomb dissociation measurement. The major part similar to(70 +/- 13)% of the cross section is observed to populate the excited states of Mg-32 after the Coulomb breakup of Mg-33. The shapes of the differential Coulomb dissociation cross sections in coincidence with different core excited states favor that the valence neutron occupies both the s(1/2) and p(3/2) orbitals. These experimental findings suggest a significant reduction and merging of sd-pf shell gaps at N similar to 20 and 28. The ground state configuration of Mg-33 is predominantly a combination of Mg-32(3.0,3.5MeV; 2(-), 1(-)) circle times nu(s1/2), Mg-32(2.5MeV; 2(+)) circle times nu(p3/2), and Mg-32(0; 0(+)) circle times nu(p3/2). The experimentally obtained quantitative spectroscopic information for the valence neutron occupation of the s and p orbitals, coupled with different core states, is in agreement with Monte Carlo shell model (MCSM) calculation using 3 MeV as the shell gap at N = 20.
collisions
neutron-rich isotopes
coulomb breakup
island
inversion
deformation
nuclei
halos
relativistic heavy-ions
Author
U. Datta
A. Rahaman
T. Aumann
S. Beceiro-Novo
K. Boretzky
C. Caesar
B. V. Carlson
W. N. Catford
S. Chakraborty
M. Chartier
D. Cortina-Gil
G. de Angelis
Paloma Diaz Fernandez
H. Emling
O. Ershova
L. M. Fraile
H. Geissel
D. Gonzalez-Diaz
Björn Jonson
Chalmers, Physics, Subatomic and Plasma Physics
Håkan T Johansson
Chalmers, Physics, Subatomic and Plasma Physics
N. Kalantar-Nayestanaki
T. Kroll
R. Krucken
J. Kurcewicz
C. Langer
T. Le Bleis
Y. Leifels
J. Marganiec
G. Munzenberg
M. A. Najafi
Thomas Nilsson
Chalmers, Physics, Subatomic and Plasma Physics
C. Nociforo
V. Panin
S. Paschalis
R. Plag
R. Reifarth
V. Ricciardi
D. Rossi
H. Scheit
C. Scheidenberger
H. Simon
J. T. Taylor
Y. Togano
S. Typel
V. Volkov
A. Wagner
F. Wamers
H. Weick
M. Weigand
J. S. Winfield
D. Yakorev
M. Zoric
Physical Review C
24699985 (ISSN) 24699993 (eISSN)
Vol. 94 3Subject Categories
Subatomic Physics
Physical Sciences
Roots
Basic sciences
DOI
10.1103/PhysRevC.94.034304