Direct experimental evidence for a multiparticle-hole ground state configuration of deformed Mg-33
Artikel i vetenskaplig tidskrift, 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
Författare
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, Fysik, Subatomär fysik och plasmafysik
Håkan T Johansson
Chalmers, Fysik, Subatomär fysik och plasmafysik
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, Fysik, Subatomär fysik och plasmafysik
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 3Ämneskategorier
Subatomär fysik
Fysik
Fundament
Grundläggande vetenskaper
DOI
10.1103/PhysRevC.94.034304