A systematic study of b- decay of neutron-rich Rh and Ag isotopes Sixth China Japan Joint Nuclear Physics Symposium

Shanghai, May 16-20, 2006Youbao Wang

Collaborators and publicationsCollaborators: Youbao Wang, S. Rinta-Antila, P. Dendooven, J. Huikari, A. Jokinen, V. S. Kolhinen, G. Lhersonneau, A. Nieminen, S. Nummela, H. Penttil, K. Perjrvi, J. Szerypo, J. C. Wang, and J. yst Department of Physics, University of Jyvskyl, FINLAND

1. New Levels in 118Pd Observed in the b Decay of very Neutron-Rich 118Rh Isotope Chin. Phys. Lett. 23(4), 808(2006)2. b decay of neutron-rich 118Ag and 120Ag isotopes Phys. Rev. C 67, 064303 (2003) 3. Decay of 114Rh to 114Pd Phys. Rev. C 67, 024303 (2003) 4. b decay of 116Agm and the vibrational structure of 116Cd Phys. Rev. C 64, 054315 (2001) 5. Beta decay of neutron-rich 116Rh and the low-lying level structure of even-even 116Pd Phys. Rev. C 63, 024309 (2001)

JYFL Layout

Transmission: 50 %, M/M=10 (with gas, 1mbar of Helium gas)M/M=100 (in vacuum mode) Recoil Ion Transport Unit

IGISOL-Ion Guide Isotope Separator On LineIon TrapIon CoolerMagnetBeam StopIon GuideCyclotron 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 ChartNZ

Level Systematics for Ru, Pd, and Cd Isotopes

jj'j2p-4h intruder excitation

Two isomeric decays of Rh and Ag isotopes

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

Decay of 114Rh (1+)

Decay of 114Rh (7-) (part)

Decay of 116Rh

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

Systematics of even-mass Palladium Nuclei

Systematics of two-quasineutron levels

First observation of complete set of three-phonon quintuplet!

Decay of 120Ag-- a gated g spectrumGate: 120Cd 505.7 keV 2+0+

Decay of 120Ag (half life and intensity ratios)

Comparison of the three-phonon states

Systematics of low-spin levels in Pd nuclei

Multi-phonon and intruder states in 116CdM. Kadi et al., PRC68, 031306(R) (2003)

Thank you!

Proton-induced fission

Collective VibrationEnergies of the three-phonon quintuplet in terms of the two-phonon anharmonicities

L(

Formula

03+

3E(22+) - 3E(21+)

31+

-3E(21+) + 6/7E(41+) + 15/7E(22+)

42+

-3E(21+) + 10/7E(41+) + 11/7E(22+)

61+

3E(41+) - 3E(21+)

23+

-3E(21+) + 36/35E(41+) + 4/7E(22+)+7/5 E(02+)

jj'jThe neutron dependence of proton 2p-2h intruder excitation energiesfor Cd nuclei2p-2h intruder