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Shell model studies along the N~126 line

Shell model studies along the N~126 line. Zsolt Podoly ák. Z. 70. 74. 78. 110. N. 122. H. Grawe, K. Langanke, G. Martinez-Pinedo, Rep.Progr.Phys.70 (2007)1525. Shape transition, triaxiality. “Shell-model” nuclei. L.M. Robledo et al., J. Phys. G. 36, 115104 (2009).

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Shell model studies along the N~126 line

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  1. Shell model studies along the N~126 line Zsolt Podolyák

  2. Z 70 74 78 110 N 122 H. Grawe, K. Langanke, G. Martinez-Pinedo, Rep.Progr.Phys.70 (2007)1525. Shape transition, triaxiality “Shell-model” nuclei L.M. Robledo et al., J. Phys. G. 36, 115104 (2009).

  3. Isomeric states around 208Pb ■ A. Gottardo et al. ■ 208Hg,209Tl N. Aldahan et al., PRC80, 061302(R) (2009). RISING: isomeric decays Isomeric state * S. Steer et al., Int. J. Mod. Phys. E18, 759 (2009) and to be published

  4. Even-even nuclei around 208Pb In box: E(4+)/E(2+) ratio

  5. π ν In the beta decay of the r-process path nuclei: The FF ν i13/2 -> πh11/2 dominates; also GT νh9/2 ->πh11/2

  6. 205Au: three proton-hole nucleus Internal gamma decay AIDA will do much better with conversion electrons Internal charged particle decay Gammas following beta decay Zs. Podolyák et al., Phys. Lett. B 672 (2009) 116.

  7. Shell-model calculations (M.Górska, H.Grawe, H. Maier, A.Brown) • and (d):TBME from L.Rydstrom et al, NPA512(1990)217 (based on Kuo-Brown interaction) • (b) and (c): three TBMEs modified • Δ(d3/2 h11/2; d3/2 h11/2)7- = +135 keV • Δ(s1/2 d5/2; s1/2 d5/2)2+,3+ =+230 keV (monopole only) • Δ(d3/2 h11/2; s1/2 h11/2)6- changed to +0.160 MeV (fit for B(E2) • Good description of energies and B(EL)s S.Steer et al., Phys. Rev C78 (2008) 061302(R)

  8. Variation of key non-diagonal TBME to fit E2 strengths. The effective proton charge used in the SM is 1.35 e which is smaller than the adopted value of 1.5 e. Note that the upper experimental limit for the 7- → 5- is increased by a factor of about five if the (unknown) transition energy is below the Pt M edge. The vertical dashed line represents the adopted TBME value, which is given in MeV.

  9. 203Ir b) modified; a) original

  10. Transition strengths in N=126 nuclei 203Ir B(E2:23/2+->19/2+) 0.02(1)b) 3.58 0.013 Effective charges: 1.5e for E2 and 2.0e for E3 (to reproduce 206Hg) • Good description of N=126 nuclei after small modifications of TBMEs

  11. N=125; Z=78 203Pt

  12. Conclusions Structure: N=126 nuclei (205Au, 204Pt, 203Ir) changes in TBME helps/needed N=128 nuclei (208Hg,209Tl) agreement with shell model N<126 nuclei (203Pt etc) shell model has difficulties

  13. Future +fast-timing measurements: 206Hg: 7- -> 5- ~1.2ns(1W.u.) … 8+ 2685 10+ 2673 8- 2558 Approved experiment on the book 205Au: beta decay from 205Pt => will fix the πs1/2 orbital 203Ir: beta decay from 203Os (νg9/2) => will fix the πd3/2,πs1/2,πh11/2 202Os: isomeric decay I=(5),(7),(10) 202Os: beta decay of 203Ir (νg9/2) 5- 1932 7- 1893 11/2- 921 shell model 4+ 1555 205Au 2+ 1181 202Os 1/2+ 240 3/2+ 0 0+ 0

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