NUSTAR Annual Meeting 2013 Nuclear Structure Features as a Guide to - PowerPoint PPT Presentation

NUSTAR Annual Meeting 2013 Nuclear Structure Features as a Guide to SHE 120 copernicium 112 roentgenium 111 110 darmstatdium 109 meitnerium 110 108 hassium 107 bohrium -8,3 -7,4 -6,4 100 -5,4 -4,4 -3,4 -2,4 -1,4 -0,35 -0,25 130 140 150 160 170 180 190 Dieter Ackermann Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt, March 1 st 2013 Dieter Ackermann NUSTAR Annual Meeting 2013 Darmstadt, March 1 sth 2013

Nuclear Structure studies at SHIP - outline • Nuclear structure features of superheavy nuclei • single particle levels  towards the shell gap (trends along isotone/isotope chains) • quasiparticle excitations  deformation/K-isomers • sf-properties  stability 162 184 • Decay spectroscopy • separation + coincidences •  ,  , e - , sf measurements 120 152 • Ion traps (SHIPTRAP) • precise mass measurements • trap assisted spectroscopy 112 copernicium 114 111 roentgenium 110 darmstatdium 109 meitnerium 108 hassium spherical shell-stabilised 107 bohrium 108 discovered at SHIP superheavy nuclei new or improved decay data -8,3 E shell -7,4 -6,4 -5,4 deformed shell-stabilised -4,4 -3,4 superheavy nuclei -2,4 -1,4 -0,35 -0,25 130 140 150 160 170 180 Calc.: A. Sobszewiski Dieter Ackermann NUSTAR Annual Meeting 2013 Darmstadt, March 1 sth 2013

Shell evolution in superheavy Z = 120 isotopes: Elena Litvinova QVC in relativistic framework – dominant n-states FUSHE 2012 Comparable Spectroscopic strengths 0.28 0.30 PC+QVC: Formation of the „shell gap“ ! RMF+BCS RMF+BCS …+QVC …+QVC Dieter Ackermann NUSTAR Annual Meeting 2013 Darmstadt, March 1 sth 2013

Shell evolution in superheavy Z = 120 isotopes: Elena Litvinova QVC in relativistic framework PRC 85, 021303(R) 2012 1. Relativistic Mean Field: spherical minima Vibration corrections 2. Small amplitude vibrations: RQRPA to alpha decay 3. Very soft nuclei: large amount of low-lying collective energies Q  [MeV] vibrational modes (~100 phonons below 15 MeV) 13 RMF Z = 120 RMF+QVC Q  [MeV] 12 11 296 298 300 302 304 A Vibrational corrections: 1. Impact on the shell gaps 2. Smearing of the shell effects Shell stabilization & vibration stabilization/destabilization (?) E.L., arXiv:1108.3508 Dieter Ackermann NUSTAR Annual Meeting 2013 Darmstadt, March 1 sth 2013

Nuclear Structure of Heavy Nuclei - Single Particle Levels and Deformation protons neutrons 184 7/2-[514] f 5/2 162 7/2+[624] d 5/2 114 108 1/2-[521] 152 f 7/2 j 15/2 102 100 i 13/2 3/2-[521] 9/2-[734] g 9/2 142 h 9/2 96 134 126 7/2+[633] 1/2+[631] 82 Dieter Ackermann NUSTAR Annual Meeting 2013 Darmstadt, March 1 sth 2013

Nuclear Structure of the Heaviest Nuclei: - odd-A odd-Z Istopes for Z = 99 -105 209 Bi( 209 Bi( 50 Ti,2n) 50 Ti,2n) 257 Db 257 Db 207 Pb( 207 Pb( 48 Ca,2n) 48 Ca,2n) 253 No 253 No 209 Bi( 209 Bi( 48 Ca,2n) 48 Ca,2n) 255 Lr 255 Lr Present status of nuclear structure Present status of nuclear structure 253 Md 253 Md - [521] - [521] -EC-> -EC-> 1/2 1/2 investigations of odd A odd Z elements investigations of odd A odd Z elements in the region Z = 99 -105 in the region Z = 99 -105 + [624] ? + [624] ? 9/2 9/2 + [624] + [624] + [624] ? + [624] ? 9/2 9/2 9/2 9/2 261 Db 261 Db 9163 9163 257 Db 257 Db 259 Db 259 Db 9074 9074 Level assignments are partly tentive Level assignments are partly tentive 9474 9474 8930 8930 8967 8967 - [521] - [521] 1/2 1/2 - [521] - [521] 1/2 1/2 - ? - ? 9/2 9/2 no  no  - [514] - [514] - [514] - [514] 7/2 7/2 - [514] - [514] - [514] - [514] 7/2 7/2 7/2 7/2 7/2 7/2 255 Lr 255 Lr 259 Lr 259 Lr 8722 8722 253 Lr 253 Lr 257 Lr 257 Lr 209 Bi( 209 Bi( 40 Ar,2n) 40 Ar,2n) 247 Md 247 Md 8470 8470 8385 8385 8794 8794 8796 8796 8861 8861 8450 8450 - [521] - [521] - [521] - [521] 1/2 1/2 1/2 1/2 - [521] - [521] no  no  - ? - ? 1/2 1/2 ? ? 9/2 9/2 - [514] - [514] - [514] - [514] - [514] - [514] - [514] - [514] 7/2 7/2 - [514] - [514] 7/2 7/2 7/2 7/2 7/2 7/2 7/2 7/2 247 Md 247 Md 249 Md 249 Md 251 Md 251 Md 253 Md 253 Md 255 Md 255 Md sf sf 7274 7274 7327 7327 - - 9/2 9/2 8421 8421 8030 8030 7540 7540 7100 7100 - [514] - [514] 7/2 7/2 8785 8785 increasing 7714 7714 - [514] - [514] 7/2 7/2 - [514] - [514] 405 405 deformation 7/2 7/2 - [521] - [521] 1/2 1/2 (E1) (E1) - [514] - [514] 7/2 7/2 7752 7752 294 294 - [514] - [514] 353 353 453 453 7/2 7/2 243 243 253 253 (E1) (E1) (E1 ?) (E1 ?) (E1) (E1) 200 200 210 210 157 157 (E1) (E1) + + (E1) (E1) 9/2 9/2 + (?) + (?) 9/2 9/2 + + + + 9/2 9/2 9/2 9/2 + [633] + [633] + [633] + [633] 7/2 7/2 + [633] + [633] + [633] + [633] 7/2 7/2 7/2 7/2 7/2 7/2 + [633] + [633] 7/2 7/2 - [521] ? - [521] ? - [521] ? - [521] ? 3/2 3/2 3/2 3/2 - [521] ? - [521] ? - [521] - [521] 3/2 3/2 243 Es 243 Es 245 Es 245 Es 247 Es 247 Es 249 Es 249 Es 251 Es 251 Es 3/2 3/2 niv_mend_alles_aktuell, FPH 10.1.2006 niv_mend_alles_aktuell, FPH 10.1.2006 Dieter Ackermann NUSTAR Annual Meeting 2013 Darmstadt, March 1 sth 2013

Deformation of odd-mass Es-isotopes as function of mass number - Relation between energy of 7/2-[514] level and deformation protons 7/2-[514] f 5/2 114 108 1/2-[521] f 7/2 102 100 i 13/2 3/2-[521] h 9/2 96 82 7/2+[633] 82 Dieter Ackermann NUSTAR Annual Meeting 2013 Darmstadt, March 1 sth 2013

Decay Study of 259 Sg (Z=106) - sf Properties, Low Lying States and Trend for N=153 Tsotones • Production: 206 Pb( 54 Cr,1n) 259 Sg, σ  1 nb 9545 keV 9610 keV 9702 keV 9035 keV 9240 keV a ) 50 255 ms 392 ms 296 ms 254 ms 411 ms • α -decay from two low lying levels • TKE(sf) of 259 Sg >15 MeV higher than for 40 Counts 255 Rf; change from asymmetric to symmetric 30 fission 20 • T 1/2 (sf, 259 Sg) ≈ 235 ms; sf from 1/2 + [620] stop stop + box 10 • change of gs – configuration within N = 153 isotones from 1/2 + [620] to 11/2 - [725] 0 E  / keV b ) 600 400 200 18 sf ( 255 Rf) 0 9000 9100 9200 9300 9400 9500 9600 9700 16 (b sf =50%) E  / keV E = 165 MeV (uncorrected) sf( 259 Sg) 14  E = 31 MeV (FWHM) Events / 5 MeV (b sf = 6%) 12 E = 180 MeV (uncorr.) 259 Sg  E = 11 MeV (FWHM) 10 (92) 254 ms 1/2+[620] 4 9240 keV, 196 ms, (HF=30) = 0 8 9545 keV, 254 ms, HF=40 F 411 ms H 11/2-[725] , s m 6 9702 keV, 255 ms, HF=4500 2 9 3 , 5 (594) 9610 keV, 411 ms, HF=26 4 3 0 11/2-[725] 9 2 (462) (1/2+[620] ?) 0 105 120 135 150 165 180 195 210 225 240 (157) E / MeV (Stop detector) 5/2+[622] 0 9/2-[734] F.P. Heßberger et al. 255 Rf Dieter Ackermann NUSTAR Annual Meeting 2013 Darmstadt, March 1 sth 2013

Decay Study of 259 Sg (Z=106) - sf Properties, Low Lying States and Trend for N=153 Tsotones • Production: 206 Pb( 54 Cr,1n) 259 Sg, σ  1 nb 9545 keV 9610 keV 9702 keV 9035 keV 9240 keV a ) 50 255 ms 392 ms 296 ms 254 ms 411 ms • α -decay from two low lying levels 800 • TKE(sf) of 259 Sg >15 MeV higher than for 40 Counts 255 Rf; change from asymmetric to symmetric 30 700 fission 20 • T 1/2 (sf, 259 Sg) ≈ 235 ms; sf from 1/2 + [620] stop 600 stop + box 10 • change of gs – configuration within N = 153 5/2+[622] isotones from 1/2 + [620] to 11/2 - [725] 0 E  / keV b ) 500 9/2+ [615] 600 9/2- [734] 400 1/2- [750] Experiment 200 400 1.3  s 19 ns 0.5  s 18 sf ( 255 Rf) 0 11/2- [725] 9000 9100 9200 9300 9400 9500 9600 9700 16 (b sf =50%) 300 E  / keV E = 165 MeV (uncorrected) sf( 259 Sg) 14  E = 31 MeV (FWHM) Events / 5 MeV (b sf = 6%) 3/2+[622] 12 E = 180 MeV (uncorr.) 200 259 Sg  E = 11 MeV (FWHM) 10 (92) 254 ms 1/2+[620] 4 9240 keV, 196 ms, (HF=30) = 0 8 9545 keV, 254 ms, HF=40 F 411 ms 0.25 s H 11/2-[725] 100 , s 4 s m 6 7/2+[613] 9702 keV, 255 ms, HF=4500 2 9 3 , 5 (594) 1/2+[620] 9610 keV, 411 ms, HF=26 4 3 0 11/2-[725] 9 0 249 Cm 251 Cf 257 Rf 253 Fm 255 No 259 Sg 2 (462) (1/2+[620] ?) 0 105 120 135 150 165 180 195 210 225 240 (157) /StrukturSWK/Abbildungen/Niv153_120412, F.P. Heßberger 12.4.2012 E / MeV (Stop detector) 5/2+[622] 0 9/2-[734] F.P. Heßberger et al. 255 Rf Dieter Ackermann NUSTAR Annual Meeting 2013 Darmstadt, March 1 sth 2013