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Linking Transitions (and Search for Superintruders) in the A  80 Region of Superdeformation

Linking Transitions (and Search for Superintruders) in the A  80 Region of Superdeformation. C. J. Chiara , D. G. Sarantites, M. Montero, J. O’Brien, O. L. Pechenaya, and W. Reviol, Washington University

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Linking Transitions (and Search for Superintruders) in the A  80 Region of Superdeformation

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  1. Linking Transitions (and Search for Superintruders) in the A80 Region of Superdeformation C. J. Chiara, D. G. Sarantites, M. Montero, J. O’Brien, O. L. Pechenaya, and W. Reviol, Washington University R. M. Clark, P. Fallon, A. Görgen, A. O. Macchiavelli, and D. Ward, Lawrence Berkeley National Laboratory W. Satuła, University of Warsaw Y. R. Shimizu, KyushuUniversity Nilsson Conf. Lund, Sweden 17 June 2005

  2. TSD (linked) A190 (linked) A150 A130 A80 (linked) (linked) (not linked!) 84Zr A60 (linked) A40 (linked) SD regions F. Lerma et al., PRC 67, 044310 (2003) B. Singh, R. Zywina, R.B. Firestone, Nucl. Data Sheets 97, 241 (2002)

  3. Experimental details • 140-MeV 32S + 0.5-mg/cm258Ni  84Zr + a2p • Gammasphere [102 Ge detectors] • Microball [95 CsI(Tl) detectors] for charged particle detection; ep80%, ea70% • Total of 2.2109 events of fold 5 or higher over 6 days.

  4. spectra Double-gated spectra of 84Zr links

  5. 84Zr lev.sch.  E1  M1/E2  E1 I0p = 25-

  6. CSLN Compare with calculations using Cranked Strutinsky + Lipkin-Nogami pairing n52p51 configuration previously assigned to SD1 based on Qt—now compare Ex, Ip as well: • Ex (near ND-SD crossing) • spin (except at alignments) • parity

  7. 84Zr 152Dy* 192Pb† B(E1) ~10-6 W.u. ~10-6 W.u. ~10-7-10-8 W.u. Depopulation of the SD well SD1 in 84Zr has weak decays to ND states, similar to the A=150,190 SD bands. *T.Lauritsen, PRL88, 042501 (2002) †A.N.Wilson, PRL90, 142501 (2003)

  8. stat’l • Weak decay-out explored with several statistical models, e.g.: • E.Vigezzi et al., PLB249,163 (1990) • J.-z.Gu and H.A.Weidenmüller, NPA660, 197 (1999) • D.M.Cardamone et al., PRL91, 102502 (2003) • Each relates GS, GN, d, FS with spreading width G. • Compare 84Zr with results inA.N.Wilson, Prog. Theor. Phys. (Kyoto), Suppl. 154, 138 (2004):

  9. Tunneling paths and barriers • Calculate potential energy surfaces for fixed spins. • Determine least-action path from SD min to ND well. • Get barrier height in direction of path. • [K.Yoshida et al., NPA696, 85 (2001) and refs. therein.] Compare 152Dy and 84Zr surfaces….

  10. 152Dy PES

  11. Below the decay-out spin in 152Dy!

  12. 84Zr PES

  13. Below the decay-out spin in 84Zr!

  14. barriers Barrier heights calculated along least-action paths from fixed-spin potential surfaces, as in K.Yoshida et al., NPA696, 85 (2001).

  15. Summary • “Full” characterization of an A80 SD band: Ex, Ip, Qt, B(sl) [several neighbors studied too, but no luck linking!] • Results are consistent with CS-LN calculations for n52p51 configuration [esp. Ex(I) in crossing region] • 84Zr SD1 has eclectic properties; similar to: • 152Dy [spin, energy, B(E1)] • 192Pb [strength of SD-ND coupling] • A60,130 regions [potential barriers] • HF+SLy4 calcs at I=25 reveal many configs at different deformations with similar energies  supports PES picture

  16. The End C. J. Chiara, D. G. Sarantites, M. Montero, J. O’Brien, O. L. Pechenaya, and W. Reviol, Washington U. R. M. Clark, P. Fallon, A. Görgen, A. O. Macchiavelli, and D. Ward, LBNL Theoretical support from W.Satuła, U. of Warsaw and Y.R.Shimizu, Kyushu U.

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