Nuclear structure around 100Sn
Darek Seweryniak, ANL
Doubly-magic nuclei
100Sn
132Sn
78Ni
48Ni
208Pb
16O
40,48Ca
56Ni
Self-conjugate
Z
GT -decay
super allowed
-decay
spe
p/2p decay
n-n interactions
100Sn
rp process
end point
N
Doubly-magic
100Sn physics
p
Heavy-ion fusion-evaporation reactions
46Ti(58Ni,4n)100Sn (EB~220MeV)
=5 nb (103Sn-5b,102Sn-500nb,101Sn-50nb, 100Sn-5nb?)
=0.5 mg/cm2
I=10 pnA
FMA=10%
20 X 100Sn /day
Fragmentation:
1 X 100Sn /day MSU
20 X 100Sn /day GSI
Very good channel selection but in-beamspectroscopy impossible…
Experimental approach
Main emphasis on excited states in 100Sn and single-particle states and nucleon-nucleon interactions using in-beam spectroscopy
More intense beams
–Push rates in GAMMASPHERE (x5)
•Digital GS
•Beams 100-200 pnA
–Channel selection – tagging with decays (, p, p, )
•High granularity DSSD
Secondary fusion-evaporation reactions
–In-flight radioactive beams
–Beams 10 pA
100Sn region – experimental status
Z=50
101Sn
102Sn
103Sn
102In
101In
99In
100In
98In
101Cd
99Ag
100Ag
99Pd
104Sb
105Te
103Sb
99Cd
100Cd
98Cd
97Cd
96Cd
95Ag
94Ag
96Ag
97Ag
98Ag
94Pd
95Pd
96Pd
97Pd
98Pd
93Pd
92Pd
106Te
108I
109Xe
112Cs
114Ba
113Cs
109I
105Sb
107Te
108Te
110Xe
111Xe
112Xe
104Sn
115Ba
116Ba
2p
2p
2p
2p
100Sn
Excited states
Fusion-evaporation
Decay properties
Fusion-evaporation
Decay properties
Existence
Fragmentation
Predictions
CN
CN
CN
CN
CN
103In
CN
CN
99Sn
95Cd
N=50
-delayed protons
with sizeable branch
Observed/expected
97In
93Ag
Secondary fusion-evaporation reactions
Transfer, deep inelastic, fusion evaporation
56Ni+50Cr->100Sn+2n, 60Zn+40Ca->100Sn, …
Tagging
Intense
stable
beam
In-flight
separator
Mass
separator
Secondary
RIB
100Sn
58Ni
10 pa
12C
1mg/cm2
=100 mb
=10%
50Cr
1mg/cm2
=1 b
=50%
56Ni
3X107
25/day
Examples
excited states in 100In (-1-), 99In (-1)
excited states in 100Sn
Excited states in 99Sn(-1),98In(-1-)
Excited states in 105Te (gas filled separator)
94Ag, 96,97Cd p and 2p emitting isomers
…
Thank you!