EURISOL_DS – Task 11 Subtask 5 Neutron- and proton-induced reactions up to Fermi energy J. Äystö...
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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)
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Transcript of EURISOL_DS – Task 11 Subtask 5 Neutron- and proton-induced reactions up to Fermi energy J. Äystö...
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. 232Th(p, fission) – Y(A), TKE, neutrons, gammas, experiment (March 2005) data processing (Oct. 2005)II 238U(p, fission) – Yprod(A,Z), JYFLTRAP (Dec. 2005)
III Code developing and calculations of the characteristics of p-induced reactions (Nov. 2005)
232Th(p, f)
1. Experiment was carried out during 10th week at JYFL at
Ep = 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 BaF2 gamma detectors
The view of experimental setup and 2D-ToF1-ToF2 spectra are shown in the next slides.
232Th(p, fission)
Experiment was carried out during 10th week at Ep = 20, 40, 55 MeV
3500 4000 4500 5000 55003000
3500
4000
4500
5000
ToF1, channel
To
F2
, ch
an
ne
l3,000
8,270
22,80
62,83
173,2
477,4
1316
3628
10000
p(20MeV)+232Th233Pa
3500 4000 4500 5000 55003000
3500
4000
4500
5000
ToF1, channel
To
F2
, ch
an
ne
l3,000
8,270
22,80
62,83
173,2
477,4
1316
3628
10000
p(40MeV)+232Th233Pa
3500 4000 4500 5000 55003000
3500
4000
4500
5000
ToF1, channel
To
F2
, ch
an
ne
l3,000
8,369
23,34
65,12
181,7
506,7
1414
3943
1,100E4
p(55MeV)+232Th233Pa
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
238U(p, f) at Ep = 30 MeV
Y(A,Z) are planned to measure at A = 70 - 170
JYFLTRAP- a triple trap setupJYFLTRAP- a triple trap setup
Twin Penning trap7T superconducting solenoid1. Purification trap2. 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
Laser beam
Interaction region
Penning trap
Cooler/buncher
Beam switchyard
55° dipole magnet
Ion guideBeam from K130 cyclotron
Ion Guide Isotope Separator On-Line (IGISOL) overviewIon Guide Isotope Separator On-Line (IGISOL) overview
Neutral atom
Ion
proton beam
U target
He inlet
500 V
250
10 kV 30 kV
5 10-4 10-6p [mbar]
Stopping volume
Fission ion guideFission ion guide
p + 238U, 232Th
• FWHM ~ 20 Hz• m/m = 145000 possible (above spectrum m/m ~ 53000) • sufficient for mass spectroscopy
Purification of isobars for A=101 fission productsPurification of isobars for A=101 fission products
0 50 100 150 200 250
0
200
400
600
800
1000
1200
1400
101Mo101Nb
101Zr
101Y
x10
Cou
nts
Frequency [+1064670 Hz]
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
