1 / 33

Investigating Linking Transitions in Superdeformed Regions

This study explores transitions in the A80 superdeformed region using experimental and theoretical methods. Detailed analysis of 84Zr spectra and comparison with calculated results provide insights into the structure and properties of superdeformed nuclei. The depopulation of the superdeformed well in 84Zr is examined, along with comparisons to neighboring nuclei. Theoretical models are employed to understand the weak decay-out processes in superdeformed states. Potential energy surfaces for fixed spins are calculated for 84Zr and 152Dy, unveiling barriers along the least-action paths. The study presents a comprehensive characterization of superdeformed bands, highlighting the unique properties of 84Zr. Results support theoretical calculations and reveal similarities with other nuclei in different mass regions.

kamuzu
Télécharger la présentation

Investigating Linking Transitions in Superdeformed Regions

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related