Ground-state configuration of neutron-rich Al-35 via Coulomb breakup
Journal article, 2017
The ground-state configuration of Al-35 has been studied via Coulomb dissociation (CD) using the LAND-FRS setup (GSI, Darmstadt) at a relativistic energy of similar to 403 MeV/nucleon. The measured inclusive differential CD cross section for Al-35, integrated up to 5.0 MeV relative energy between the Al-34 core and the neutron using a Pb target, is 78(13) mb. The exclusive measured CD cross section that populates various excited states of 34Al is 29(7) mb. The differential CD cross section of Al-35 -> Al-34 + n has been interpreted in the light of a direct breakup model, and it suggests that the possible ground-state spin and parity of Al-35 could be, tentatively, 1/2+ or 3/2(+) or 5/2(+). The valence neutrons, in the ground state of Al-35, may occupy a combination of either l = 3,0 or l = 1,2 orbitals coupled with the Al-34 core in the ground and isomeric state(s), respectively. This hints of a particle-hole configuration of the neutron across the magic shell gaps at N = 20,28 which suggests narrowing the magic shell gap. If the 5/2+ is the ground-state spin-parity of Al-35 as suggested in the literature, then the major ground-state configuration of Al-35 is a combination of Al-34(g. s.; 4(-)) circle times upsilon(p3/2) and Al-34(isomer; 1(+)) circle times upsilon(d3/2) states. The result from this experiment has been compared with that from a previous knockout measurement and a calculation using the SDPF-M interaction.
N=20 Shell Closure
Ions
Emission
Inversion
Excitation
Mass Measurements
Nuclei
Isotopes
Island
Collisions
Author
S. Chakraborty
U. Datta
T. Aumann
S. Beceiro-Novo
K. Boretzky
C. Caesar
B. V. Carlson
W. N. Catford
M. Chartier
D. Cortina-Gil
G. de Angelis
Paloma Diaz Fernandez
Chalmers, Physics, Subatomic and Plasma Physics
H. Emling
O. Ershova
L. M. Fraile
H. Geissel
D. Gonzalez-Diaz
Håkan T Johansson
Chalmers, Physics, Subatomic and Plasma Physics
Björn Jonson
Chalmers, Physics, Subatomic and Plasma Physics
N. Kalantar-Nayestanaki
T. Kroll
R. Kruecken
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
R. Plag
A. Rahaman
R. Reifarth
M. V. Ricciardi
C. Rigollet
D. Rossi
C. Scheidenberger
H. Scheit
H. Simon
J. T. Taylor
Y. Togano
S. Typel
Y. Utsuno
A. Wagner
F. Wamers
H. Weick
J. S. Winfield
Physical Review C
24699985 (ISSN) 24699993 (eISSN)
Vol. 96 3 1965-Subject Categories
Physical Sciences
DOI
10.1103/PhysRevC.96.034301