1. EURISOL_DS – Task 11 Subtask 5 Neutron- and proton-induced reactions up to Fermi energy J. Äystö / V. Rubchenya JYFL, Jyväskylä (P9) / KhRI, St.Petersburg (C4) Deliverables I. 232 Th(p, fission) – Y(A), TKE, neutrons, gammas, experiment (March 2005) data processing (Oct. 2005) II 238 U(p, fission) – Y prod (A,Z), JYFLTRAP (Dec. 2005) III Code developing and calculations of the characteristics of p-induced reactions (Nov. 2005)

2. 232 Th(p, f) 1.Experiment was carried out during 10th week at JYFL at E p = 20, 40 and 55 MeV. 1.Experimental setup consisted of: Two arm ToF fission fragment spectrometer based on MCP detectors – CORSET One arm ToF-E fission fragment spectrometer – CORSET 8 DEMON neutron detectors 2 position sensitive neutron detectors (PSND) 12 BaF 2 gamma detectors The view of experimental setup and 2D-ToF1-ToF2 spectra are shown in the next slides.

3. 232 Th(p, fission) Experiment was carried out during 10th week at E p = 20, 40, 55 MeV

7. JYFLTRAP New method of fission fragment yield measurement Combination of the IGISOL mass separator facility and the JYFLTRAP facility The proposal to JYFL PAC was submitted by March 15, 2005 238 U(p, f) at E p = 30 MeV Y(A,Z) are planned to measure at A = 70 - 170

8. JYFLTRAP- a triple trap setup Twin Penning trap 7T superconducting solenoid 1.Purification trap 2.Precision trap Spectroscopy station beam from IGISOL c = (q/m)  (B/2  ) A. Nieminen, et al., Phys. Rev. Lett. 88(2002)094801 S. Rinta-Antila et al., Phys. Rev. C 70(2004)011301

9. Laser beam Interaction region Penning trap Cooler/buncher Beam switchyard 55 ° dipole magnet Ion guide Beam from K130 cyclotron Ion Guide Isotope Separator On-Line (IGISOL) overview

10. Fission ion guide p + 238 U, 232 Th

11. FWHM ~ 20 Hz m/  m = 145000 possible (above spectrum m/  m ~ 53000) sufficient for mass spectroscopy Purification of isobars for A=101 fission products

12. ST3 Model of fission process Pre-equilibrium model in p- and n- reactions with heavy nuclei Systematics of fission modes from thermal-neutron-induced fission to high excitation energy Improving description of post scission neutrons