Schottky mass measurement of the 208Hg isotope: implication for the proton-neutron interaction strength around doubly magic 208Pb.
Time-resolved Schottky mass spectrometry has been applied to uranium projectile fragments which yielded the mass value for the 208Hg (Z=80, N=128) isotope. The mass excess value of ME=-13 265(31) keV has been obtained, which has been used to determine the proton-neutron interaction strength in 210Pb, as a double difference of atomic masses. The results show a dramatic variation of the strength for lead isotopes when crossing the N=126 neutron shell closure, thus confirming the empirical predictions that this interaction strength is sensitive to the overlap of the wave functions of the last valence neutrons and protons.
Chen
L
L
GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany.
Litvinov
Yu A
YA
Plass
W R
WR
Beckert
K
K
Beller
P
P
Bosch
F
F
Boutin
D
D
Caceres
L
L
Cakirli
R B
RB
Carroll
J J
JJ
Casten
R F
RF
Chakrawarthy
R S
RS
Cullen
D M
DM
Cullen
I J
IJ
Franzke
B
B
Geissel
H
H
Gerl
J
J
Górska
M
M
Jones
G A
GA
Kishada
A
A
Knöbel
R
R
Kozhuharov
C
C
Litvinov
S A
SA
Liu
Z
Z
Mandal
S
S
Montes
F
F
Münzenberg
G
G
Nolden
F
F
Ohtsubo
T
T
Patyk
Z
Z
Podolyák
Zs
Z
Propri
R
R
Rigby
S
S
Saito
N
N
Saito
T
T
Scheidenberger
C
C
Shindo
M
M
Steck
M
M
Ugorowski
P
P
Walker
P M
PM
Williams
S
S
Weick
H
H
Winkler
M
M
Wollersheim
H-J
HJ
Yamaguchi
T
T