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Structure of Super-Heavy Elements

Structure of Super-Heavy Elements. Andreas Heinz A. W. Wright Nuclear Structure Laboratory Yale University ATLAS Workshop, August 8-9, 2009. Motivation. Understanding the evolution of nuclear structure of the heaviest nuclei.

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Structure of Super-Heavy Elements

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  1. Structure of Super-Heavy Elements Andreas Heinz A. W. Wright Nuclear Structure Laboratory Yale University ATLAS Workshop, August 8-9, 2009

  2. Motivation • Understanding the evolution of nuclear structure of the heaviest nuclei. • The FMA measures A/q - an additional parameter which is very useful for the interpretation of complicated decay spectra and the measurement of weak branching ratios. • Spectroscopy at the limits: decay of isomeric states provides valuable information on nuclear structure.

  3. Measuring Weak Branching Ratios random Mass of α-correlated ERs • Two fission groups: • From 257Rf: • From 256Rf: Mass of SF-correlated ERs SF branch ratio of 257Rf: Somerville et al., PRC 31, 1801 (1985): 0.14(9)

  4. B A lnT(implant-ICE) Electron E (keV) B A Alpha E (keV) (High-K) Isomers in 257Rf Isomeric Electron E vs.lnT Isomeric γor ICE Ground/Isomeric ER Electron-alpha correlation α Ground Daughter Decay of high-K isomers can provide valuable information of non-collective states near the Fermi energy. High-K isomers might become more stable than the ground state. J. Qian et al., PRC 79, 064319 (2009)

  5. Possible Future Experiment: 58Fe @ 264 MeV on 208Pb →265Hs + 1n Production cross section: 63±10 pb 5 known alpha lines 1 known isomeric state From: S. Hofmann, Rep. Prog. Phys. 61 (1998) 639

  6. Wish List • Intensity, intensity, intensity • Long experiments • Complicated setup → campaigns • Dedicated detection system → complete spectroscopy

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