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Some Ideas for A Future Plan of Research at ATLAS

Xiaofeng Wang The Riley Group at FSU. Some Ideas for A Future Plan of Research at ATLAS. Favored Experimental Conditions at ATLAS. (Enhanced) stable beam + (Digital) Gammasphere (GS) Radioactive beam from CARIBU + (Digital) GS If necessary, combined with FMA, charged-

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Some Ideas for A Future Plan of Research at ATLAS

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  1. Xiaofeng Wang The Riley Group at FSU Some Ideas for A Future Plan of Research at ATLAS

  2. Favored Experimental Conditions at ATLAS • (Enhanced) stable beam + (Digital) Gammasphere (GS) • Radioactive beam from CARIBU + (Digital) GS • If necessary, combined with FMA, charged- • particle detector array (e.g., CHICO, Microball…). • In the future, GRETINA will also be considered.

  3. Extend Ultrahigh-spin story to Ho, Dy, Hf… nuclei (search for new collective structures at ultrahigh spin) 162Hf (proposed) 154 (observed/ proposed) 157,158Er (observed/ measured) 159,160 (observed) Ho Dy + Lifetime measurement (quadrupole moment) to determine the deformation 65hbar! Paul et al., PRL 98, 012501 (2007).

  4. Search for 2-phonon (and even multiple-phonon) octupole bands in Actinides, Lanthanides 0-pn 1-pn 2-pn Nazarewicz et al., NPA 429, 269 (1984). • “Unsafe” Coulomb excitation (multiple- • neutron transfer): need radioactive target. • Fu-Ev reaction: need radioactive beam • (CARIBU?). 240Pu Wang et al., PRL 102, 122501 (2009).

  5. Pu 242 94 () (+) Search for Tetrahedral Symmetry in Lanthanides, Actinides Low-spin: Tetrahedral? High-spin: Octupole vibration? Round-edge pyramid shape Predicted Tetrahedral magic numbers: Zt = 16, 20, 32, 40, 56-58, 70, 90-94. Nt = 16, 20, 32, 40, 56-58, 70, 90-94. Wang, Ph.D. thesis, Notre Dame (2007). • Measure branching ratios. • Measure dipole transition probabilities • of interband lines. Dudek et al., PRL 88, 252502 (2002).

  6. Identify decay path of SD, TSD structures in Er, Yb, Hf… nuclei “Floating” candidate bands observed previously. 154Er: 1 TSD, 1 SD Lagergren et al., PRL 87, 022502 (2001). 157Er: 2 TSDs; 158Er: 2 TSDs Paul et al., PRL 98, 012501 (2007). 159Er: 1 TSD; 160Er: 2 TSDs Ollier et al., submitted to PRC. 160Yb: 1 TSD. Aguilar et al., PRC 77, R021302 (2008). 174Hf: 8 TSDs/SDs Djongolov et al., PLB 560, 24 (2003). Hartley et al., PLB 608, 31 (2005). Lauritsen et al., PRL 88, 042501 (2002).

  7. Search for Low-lying SD, TSD (wobbling?) in n-rich 44Ru • PES calculations show low-lying (I ~ 20hbar) SD/TSD minima and fruitful coexisting shapes in n-rich Ru, best cases: 110,112Ru... • We intend to study 108-112Ru. Need to populate up to I ~ 30hbar. • Reactions: Safe or unsafe Coulex – n-rich Ru beam (107-112Ru yield>106 from CARIBU) on thick target (e.g., 208Pb), or on thin target with charged-particle detectors (e.g., CHICO) used. • Trigger set on target nuclei. Skalski et al., NPA 617, 282 (1997).

  8. Collaboration FSU: X. Wang, M. A. Riley, S. Yuan, C. Teal USNA: D. J. Hartley Argonne: M. P. Carpenter, C. J. Chiara, R. V. F. Janssens, F. G. Kondev, T. Lauritsen, S. Zhu Liverpool (UK): E. S. Paul, A. J. Boston, H. C. Boston, D. Judson, P. J. Nolan, J. Revill, C. Unsworth Daresbury (UK): J. Simpson, J. Ollier Tennessee: L. L. Riedinger Notre Dame: A. D. Ayangeakaa, U. Garg, J. Matta Berkeley: P. Fallon, M. K. Petri Lund (Sweden): I. Ragnarsson Oak Ridge: D. Radford, C.H. Yu iThemba (South Africa): J. F. Sharpey-Schafer

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