Core-excited states in 101Sn - Argonne National Laboratory
Core-excited states in Darek Seweryniak, ANL GS/FMA collaboration Sn 101 Sn physics 100 Z super allowed -decay rp process end point p decay Doubly-magic Self-conjugate 100 Sn spe GT -decay p n-n interactions
N Sn region experimental status 100 Cs 113 Xe 112 112 109 Xe Xe 110 Ba 114 111 115 Ba Ba
116 CN Cs Xe CN N=50 108 105 Sb 103 Sn 99 Z=50 In 97 In 98 100
99 Sn In Sn 101 In 100 Sn 102 In 101 Te 106 Te Sb 105 Sn 104
103 In 102 Cd 96 Cd Cd 97 Cd 98 CN Ag 94 Pd 93 93 92 Ag
Ag 96 Pd 95 Ag 95 Pd 94 CN Pd 97 Cd 99 Ag 98 Pd 97
96 Ag Pd 100 Cd CN In 103 Ag 99 98 Pd 100 Ag 101 100 Pd 99
Cd Cd 101 108 Te -delayed protons with sizeable branch Observed/expected Sn CN 95 Te 107 I 109 CN Sb 104 I
Ag Pd 100 Excited states Fusion-evaporation Decay properties Fusion-evaporation Decay properties Existence Fragmentation Sn p recoil-decay tagging experiment rays 101 Ep=1-5 MeV tp<5s GAMMASPHERE+FMA First observation 1st exp PRL 99, 022504 (2007) Search for core excited states 2nd exp summer 2008 p 101 Sn Random 100
Cd Te decay indicates that the level sequence is different in 105Te and 101Sn (ORNL) 105 Total spectrum g7/2 172 keV d5/2 101 Sn Ag 101 Core-excited states in 101 Sn 100Sn(2+) coupled to d5/2 and g7/2 states ~2.5 MeV h11/2 single-neutron orbital ~2.5 MeV Feeding pattern can reveal the d5/2, g7/2 orbital order Other nuclei of interest: 105Te, 100In 5/2+
7/2+ 7/2+ 5/2+ Fahlander et al., Phys. Rev. C63, 021307(R) (2001) Can we collect more statistics with GRETINA+FMA? VERY CHALLENGING EXPERIMENT! Original experiment: ~5 days, ~10 kHz/Ge, ~10s nb 4 times larger solid angle (possibility to use 3n channel)n channel) Higher Ge rates (higher beam intensity) Much better Doppler correction (3n channel) MeV) Polarization (h11/2) No dead time Neutron Wall (Chris Chiara) Interplay between rotation and proton decay in highlydeformed proton emitters Darek Seweryniak, ANL GS/FMA collaboration Proton decay vs rotation Proton decay probes single-particle wave function components
In deformed nuclei, protons are emitted from rotational band heads Properties of rotational bands can shed light on the proton emitting states Only very recently the quasi-particle non-adiabatic proton-decay model by Maglione et al. included Coriolis interaction and pairing consistently The new model has to be confronted with more data Proton emitter landscape ~20 mass units away from the line of stability Often less exotic neighbors not known Rotational bands in highly-deformed proton emitters Tm 145 141 131 117 La Ho Several proton emitters were studied
with GS and FMA Ho strongly coupled bands built on gs and isomer 141 145 117 Eu Tm decoupled h11/2 band La,131Eu multiple bands, not enough statistics Rotational bands in the deformed proton emitter 141Ho Unexpectedly large signature splitting indicates triaxial shape! =0.25(4) from Harris
formula 7/2- D. Seweryniak et al., PRL C86(2001)1458 + Eu level scheme 131 5/2+ or 3/2+ ground state? 5/2+ band in 159Eu96 after A5/3 scaling gives: 9/2+ 134 237 7/2+ 104 5/2+ 3/2+ band in 159Tb94 after A5/3 scaling gives: 9/2+ 105 189 7/2+ 72 5/2+ We observed 72 keV and 105 keV.
Low energy transitions present in the spectrum suggest the 3/2+ assignment La proton emitter 117 Z.Liu et al., Physics Letters B 702 (2011) 2427 Quasi-particle non-adiabatic model predicts that protons are emitted from a 7/2- member of the h11/2 band Spectrum indicates 3n channel)/2+ band supported by adiabatic approach Can we collect more statistics with GRETINA and FMA? CHALLENGING EXPERIMENT! Original experiment: ~5 days, ~10 kHz/Ge, ~100s nb 4 times larger FMA solid angle Higher Ge rates (more beam) Better Doppler correction Polarization No dead time Thank you for you attention!
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