| 1. |
- Al-Adili, Ali, et al.
(författare)
-
Ion counting efficiencies at the IGISOL facility
- 2014
-
Rapport (övrigt vetenskapligt/konstnärligt)abstract
- At the IGISOL-JYFLTRAP facility, fission mass yields can be studied at high precision. Fission fragments from a U target are passing through a Ni foil and entering a gas filled chamber. The collected fragments are guided through a mass separator to a Penning trap where their masses are identified. This simulation work focuses on how different fission fragment properties (mass, charge and energy) affect the stopping efficiency in the gas cell. In addition, different experimental parameters are varied (e. g. U and Ni thickness and He gas pressure) to study their impact on the stopping efficiency. The simulations were performed using the Geant4 package and the SRIM code. The main results suggest a small variation in the stopping efficiency as a function of mass, charge and kinetic energy. It is predicted that heavy fragments are stopped about 9% less efficiently than the light fragments. However it was found that the properties of the U, Ni and the He gas influences this behavior. Hence it could be possible to optimize the efficiency.
|
|
| 2. |
|
|
| 3. |
- Gorelov, D., et al.
(författare)
-
Isomeric Yield Ratios of Fission Products Measured with the Jyfltrap
- 2014
-
Ingår i: Acta Physica Polonica B. - 0587-4254 .- 1509-5770. ; 45:2, s. 211-216
-
Tidskriftsartikel (refereegranskat)abstract
- Experimental methods to determine isomeric yield ratios usually apply gamma-spectroscopic techniques. In such methods, ground and isomeric states are distinguished by their decays. In the present work, several isomeric yield ratios of fission products have been measured by utilizing capabilities of the double Penning-trap mass spectrometer JYFLTRAP, where isomeric and ground state were separated by their masses. To verify the new experimental technique, the results were compared to those from gamma-spectroscopy measurements.
|
|
| 4. |
- Gorelov, D., et al.
(författare)
-
Measurement of Isomeric Yield Ratios of Fission Products with the Jyfltrap
- 2014
-
Ingår i: Fission and Properties of Neutron-Rich Nuclei - Proceedings of the Fifth International Conference on ICFN5. Edited by Hamilton Joseph H & Ramayya Akunuri V. Published by World Scientific Publishing Co. Pte. Ltd., 2014. ISBN #9789814525435, pp. 252-257. - : WORLD SCIENTIFIC. ; , s. 252-257
-
Konferensbidrag (refereegranskat)
|
|
| 5. |
|
|
| 6. |
|
|
| 7. |
- Lantz, Mattias, et al.
(författare)
-
Design of a High Intensity Neutron Source for Neutron-Induced Fission Yield Studies
- 2012
-
Ingår i: Use of Neutron Beams for High Precision Nuclear Data Measurements. - Vienna.
-
Konferensbidrag (refereegranskat)abstract
- The upgraded IGISOL facility with JYFLTRAP, at the accelerator laboratory of the University of Jyväskylä, has been supplied with a new cyclotron which will provide protons of the order of 100 μA with up to 30 MeV energy, or deuterons with half the energy and intensity. This makes it an ideal place for measurements of neutron-induced fission products from various actinides, in view of proposed future nuclear fuel cycles. The groups at Uppsala University and University of Jyväskylä are working on the design of a neutron converter that will be used as neutron source in fission yield studies. The design is based on simulations with Monte Carlo codes and a benchmark measurement that was recently performed at The Svedberg Laboratory in Uppsala. Inorder to obtain a competitive count rate the fission targets will be placed very close to the neutron converter. The goal is to have a flexible design that will enable the use of neutron fields with different energy distributions. In the present paper, some considerations for the design of the neutron converter will be discussed, together with different scenarios for which fission targets and neutron energies to focus on.
|
|
| 8. |
- Lantz, Mattias, 1971-, et al.
(författare)
-
Design of a neutron converter for fission studies at the IGISOL facility
- 2012
-
Ingår i: Physica Scripta. - he Royal Swedish Academy of Sciences. - 0031-8949 .- 1402-4896. ; T150, s. 014020-
-
Konferensbidrag (refereegranskat)abstract
- The upgraded IGISOL facility with JYFLTRAP, at the accelerator laboratory of the University of Jyväskylä, has been supplied with a new cyclotron which will provide proton or deuteron beams of the order of 100 μA with up to 30 MeV energy. This makes it an ideal place for measurements of neutron-induced fission fragments from various actinides, in view of proposed future nuclear fuel cycles. In the present paper, some considerations for the design ofa neutron converter, based on simulations with the Monte Carlo codes MCNPX and FLUKA,are described.
|
|
| 9. |
|
|
| 10. |
|
|
