1. Nuclear structure around 100 Sn Darek Seweryniak, ANL

2. Doubly-magic nuclei 100 Sn 132 Sn 78 Ni 48 Ni 208 Pb 16 O 40,48 Ca 56 Ni

3. Self-conjugate Z GT  -decay super allowed  -decay spe p/2p decay n-n interactions 100 Sn rp process end point N Doubly-magic 100 Sn physics pp

4. Heavy-ion fusion-evaporation reactions 46 Ti( 58 Ni,4n) 100 Sn (E B ~220MeV)  =5 nb ( 103 Sn-5  b, 102 Sn-500nb, 101 Sn-50nb, 100 Sn-5nb?)  =0.5 mg/cm 2 I=10 pnA  FMA =10% 20 X 100 Sn /day Fragmentation: 1 X 100 Sn /day MSU 20 X 100 Sn /day GSI Very good channel selection but in-beam spectroscopy impossible…

5. Experimental approach Main emphasis on excited states in 100 Sn 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 p  A

6. 100 Sn region – experimental status Z=50 101 Sn 102 Sn 103 Sn 102 In 101 In 99 In 100 In 98 In 101 Cd 99 Ag 100 Ag 99 Pd 104 Sb 105 Te 103 Sb 99 Cd 100 Cd 98 Cd 97 Cd 96 Cd 95 Ag 94 Ag 96 Ag 97 Ag 98 Ag 94 Pd 95 Pd 96 Pd 97 Pd 98 Pd 93 Pd 92 Pd 106 Te 108 I 109 Xe 112 Cs 114 Ba 113 Cs 109 I 105 Sb 107 Te 108 Te 110 Xe 111 Xe 112 Xe 104 Sn 115 Ba 116 Ba 2p 100 Sn Excited states Fusion-evaporation Decay properties Fusion-evaporation Decay properties Existence Fragmentation Predictions CN 103 In CN 99 Sn 95 Cd N=50  -delayed protons with sizeable branch Observed/expected 97 In 93 Ag

7. Secondary fusion-evaporation reactions Transfer, deep inelastic, fusion evaporation 56 Ni+ 50 Cr-> 100 Sn+  2n, 60 Zn+ 40 Ca-> 100 Sn, … Tagging Intense stable beam In-flight separator Mass separator Secondary RIB 100 Sn 58 Ni 10 p  a 12 C 1mg/cm 2  =100 mb  =10% 50 Cr 1mg/cm 2  =1  b  =50% 56 Ni 3X10 7 25/day

8. Examples excited states in 100 In (  -1 - ), 99 In (  -1 ) excited states in 100 Sn Excited states in 99 Sn( -1 ), 98 In(  -1 -  ) Excited states in 105 Te (gas filled separator) 94 Ag, 96,97 Cd p and 2p emitting isomers …

9. Thank you!