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Nuclear structure around 100 Sn

Nuclear structure around 100 Sn. Darek Seweryniak, ANL. Doubly-magic nuclei. 208 Pb. 100 Sn. 48 Ni. 56 Ni. 132 Sn. 16 O. 78 Ni. 40,48 Ca. 100 Sn physics. Z. super allowed a -decay. rp process end point. p/2p decay. 100 Sn. Doubly-magic. Self-conjugate. spe. n-n interactions.

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Nuclear structure around 100 Sn

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  1. Nuclear structure around 100Sn Darek Seweryniak, ANL

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

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

  4. Heavy-ion fusion-evaporation reactions • 46Ti(58Ni,4n)100Sn (EB~220MeV) • s=5 nb (103Sn-5mb,102Sn-500nb,101Sn-50nb, 100Sn-5nb?) • t=0.5 mg/cm2 • I=10 pnA • eFMA=10% 20 X 100Sn /day Fragmentation: 1 X 100Sn /day MSU 20 X 100Sn /day GSI Very good channel selection but in-beam spectroscopy impossible…

  5. 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 (bg, bp, p, a) • High granularity DSSD • Secondary fusion-evaporation reactions • In-flight radioactive beams • Beams 10 pmA

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

  7. Secondary fusion-evaporation reactions • Transfer, deep inelastic, fusion evaporation • 56Ni+50Cr->100Sn+a2n, 60Zn+40Ca->100Sn, … Intense stable beam Secondary RIB 100Sn Tagging Mass separator In-flight separator 58Ni 10 pma 12C 1mg/cm2 s=100 mb e=50% 25/day e=10% 56Ni 3X107 50Cr 1mg/cm2 s=1 mb

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

  9. Thank you!

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