A systematic study of  - decay of neutron-rich Rh and Ag isotopes Sixth China Japan Joint Nuclear Physics Symposium Shanghai, May 16-20, 2006 Youbao Wang.

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Presentation transcript:

A systematic study of  - decay of neutron-rich Rh and Ag isotopes Sixth China Japan Joint Nuclear Physics Symposium Shanghai, May 16-20, 2006 Youbao Wang

Collaborators and publications Collaborators: Youbao Wang, S. Rinta-Antila, P. Dendooven, J. Huikari, A. Jokinen, V. S. Kolhinen, G. Lhersonneau, A. Nieminen, S. Nummela, H. Penttilä, K. Peräjärvi, J. Szerypo, J. C. Wang, and J. Äystö Department of Physics, University of Jyväskylä, FINLAND 1. New Levels in 118 Pd Observed in the  Decay of very Neutron-Rich 118 Rh Isotope Chin. Phys. Lett. 23(4), 808(2006) 2.  decay of neutron-rich 118 Ag and 120 Ag isotopes Phys. Rev. C 67, (2003) 3. Decay of 114 Rh to 114 Pd Phys. Rev. C 67, (2003) 4.  decay of 116 Ag m and the vibrational structure of 116 Cd Phys. Rev. C 64, (2001) 5. Beta decay of neutron-rich 116 Rh and the low-lying level structure of even-even 116 Pd Phys. Rev. C 63, (2001)

JYFL Layout

Transmission: 50 %, M/  M=10 (with gas, 1mbar of Helium gas) M/  M=100 (in vacuum mode) R ecoil I on T ransport U nit

IGISOL-Ion Guide Isotope Separator On Line Ion Trap Ion Cooler Magnet Beam Stop Ion Guide Cyclotron beam

The Principle of Ion Guide

Main ion guide characteristics fast (ms separation times) no element selectivity large beam energy spread (~100 eV) Fission ion guide

Partial Nuclide Chart N Z

Level Systematics for Ru, Pd, and Cd Isotopes

jj j'  j 2p-4h intruder excitation  Collective Vibration 1

Two isomeric decays of Rh and Ag isotopes

Experimental setup moving tape cylindrical plastic scintillator beam from IGISOL cylindrical plastic scintillator:  = 63 % 4 Ge - detectors  tot = 2.4 % (1 MeV) tape transport system

Decay of 114 Rh (1 + )

Decay of 114 Rh (7 - ) (part)

Decay of 116 Rh

Decay of very neutron-rich 118 Rh Fifteen neutrons from the stable 103 Rh

Systematics of even-mass Palladium Nuclei

Systematics of two-quasineutron levels

First observation of complete set of three-phonon quintuplet!

Decay of 120 Ag-- a gated  spectrum Gate: 120 Cd keV 2 +  0 +

Decay of 120 Ag (half life and intensity ratios)

Comparison of the three-phonon states

Systematics of low-spin levels in Pd nuclei Systematics of intruder states in Cd nuclei

Multi-phonon and intruder states in 116 Cd M. Kadi et al., PRC68, (R) (2003)

Thank you!

Proton-induced fission

Collective Vibration 1 Energies of the three-phonon quintuplet in terms of the two-phonon anharmonicities

jj j'  j The neutron dependence of proton 2p-2h intruder excitation energies for Cd nuclei  2p-2h intruder 