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MEASUREMENTS OF NEUTRON TOTAL CROSS SECTIONS OF HAFNIUM AT POHANG NEUTRON FACILITY

MEASUREMENTS OF NEUTRON TOTAL CROSS SECTIONS OF HAFNIUM AT POHANG NEUTRON FACILITY. Course Title : Phenomenology Honorable Professor Kihyeon Cho. Prepared By: A.K.M. Moinul Haque Meaze * Center for High Energy Physics, Kyungpook National University Daegu 702-701, Korea.

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MEASUREMENTS OF NEUTRON TOTAL CROSS SECTIONS OF HAFNIUM AT POHANG NEUTRON FACILITY

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  1. MEASUREMENTS OF NEUTRON TOTAL CROSS SECTIONS OF HAFNIUM AT POHANG NEUTRON FACILITY Course Title : Phenomenology Honorable Professor Kihyeon Cho Prepared By: A.K.M. Moinul Haque Meaze* Center for High Energy Physics, Kyungpook National University Daegu 702-701, Korea Practice before KPS Autumn Meeting *mhqmeaze@yahoo.com The 14th October 2003

  2. The People Involved • D. Son • G.N. Kim • A.K.M. M. H. Meaze • H. Ahmed Center for High Energy Physics Kyungpook National University Daegu 702-701, Korea • W. Namkung • V. Skoy • Y.S. Lee • H.S. Kang • M.H. Cho • I.S. Ko Pohang Accelerator Laboratory Pohang University of Science and Technology Pohang 790-784,Korea Practice before KPS Autumn Meeting *mhqmeaze@yahoo.com The 14th October 2003

  3. ABSTRACT In order to obtain neutron total cross section, a transmission experiment was carried out on the sample of Hafnium (Hf) at the Pohang Neutron Facility. A 6Li-ZnS(Ag) scintillator detector and time of flight technique were used to measure the transmission. The PNF consists of 100 MeV electron linac, a water cooled Tantalum (Ta) target and four position automatic sample changer controlled remotely by CAMAC data acquisition system. The distances from the water cooled Ta target to the sample changer and to the scintillator are 5.4m and 10.8m respectively. Notch filter consists of Cobalt (Co) Indium (In) and Cadmium (Cd) which has a large resonance peaks in the spectrum to determine the background levels. To reduce gamma flash originated from the neutron target we have employed a neutron–gamma separation system based on their different pulse shape. For this measurement the total energy range was covered from 0.1eV to 100eV. The present result was compared with ENDF/VI. Practice before KPS Autumn Meeting *mhqmeaze@yahoo.com The 14th October 2003

  4. INTRODUCTION Cross Section Neutron Cross Section Macroscopic Cross Section Microscopic Cross Section Absorption cross section Scattering Cross Section Capture Cross Section Elastic Scattering Cross Section Inelastic Scattering Cross Section Fission Cross Section Practice before KPS Autumn Meeting *mhqmeaze@yahoo.com The 14th October 2003

  5. INTRODUCTION • Information about the relative probabilities of different reactions provides clues to the problem of nuclear structure and offers a testing ground for ideas about nuclear forces. So cross section is used to obtain information about the internal structure of atomic nuclei and their constituents. • The possibility of achieving a chain reaction and to design and development of a nuclear reactor depend strongly on the values of neutron cross section • Hafnium is one of the rare earth isotopes has a relatively large total cross section in the thermal energy region which is a useful absorbing material for control rods of the thermal reactor. Source Sample Detector Incident flux Transmitted flux Flight path Fig.: Geometrical arrangement of measurement of total cross section Practice before KPS Autumn Meeting *mhqmeaze@yahoo.com The 14th October 2003

  6. APPARATUS Figures (Clockwise): PNF Linac, Target, Moderator and Sizes of target plates 10 Ta Plates - 3 (40 mmx 2mm t) - 2 (40 mmx 3mm t) - 1 (40 mmx 4mm t) - 4 (40 mmx 6mm t) with 2 mm t Ti cover Ta161(,n)Ta160 Practice before KPS Autumn Meeting *mhqmeaze@yahoo.com The 14th October 2003

  7. Figures (Clockwise): Outside of TOF area, Data acquitting system and sample changer Practice before KPS Autumn Meeting *mhqmeaze@yahoo.com The 14th October 2003

  8. Name & Properties of Sample We have used following equations Beam Condition Energy:65MeV Repetition rate:10Hz Pulse width:1microS Practice before KPS Autumn Meeting *mhqmeaze@yahoo.com The 14th October 2003

  9. Analyzing Data Fig.1:Channel Vs Counts Fig.2:Background Fitting Practice before KPS Autumn Meeting *mhqmeaze@yahoo.com The 14th October 2003

  10. Fig.3: TOF with background level Fig.4: Resonance fitting 1 Practice before KPS Autumn Meeting *mhqmeaze@yahoo.com The 14th October 2003

  11. Fig.5: Resonance fitting 2 Fig.6: Resonance fitting 3 Practice before KPS Autumn Meeting *mhqmeaze@yahoo.com The 14th October 2003

  12. L=(10.800±0.020)m Fig.7: Resonance fitting 4 τ=(0.299±0.001)µS Fig.8: Fit of TOF path to resonances Practice before KPS Autumn Meeting *mhqmeaze@yahoo.com The 14th October 2003

  13. RESULTS Fig.7: Energy Vs Cross Section CONCLUSIONS *The preliminary results of the transmission analysis are fair with ENDF except resonances area *The analysis is still going on and we expect to show final results in near future Practice before KPS Autumn Meeting *mhqmeaze@yahoo.com The 14th October 2003

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