Contributions to Nuclear Data by Radiochemistry Division, BARC

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Presentation transcript:

Contributions to Nuclear Data by Radiochemistry Division, BARC Kathi Sudarshan Radiochemistry Division Bhabha Atomic Research Centre Mumbai-400 085, INDIA sudarshankathi@gmail.com

Nuclear reaction data: Users and experimentalists determining them Fission yield distribution in neutron induced fission of actinides (for nuclear data and understanding the factors influencing them) Mass, charge and angular distribution of fission products in heavy ion induced fission (understanding the mechanism of the reactions) Nuclear spectroscopy Neutron capture cross-section/gamma-ray production probabilities for analytical purposes

Facilities Reactors Accelerators APSARA CIRUS DHRUVA neutrons En=0-10 MeV n  5x1011 to 5x1013 n cm-2s-1 f = 20 TO 150 Accelerators BARC-TIFR Pelletron, Mumbai Variable Energy Cyclotron, Kolkata p,  and heavy ions I  nA to μA E 3-8 MeV/A

Methodologies Radiochemical method Irradiation followed by off-line -ray spectrometry Induced activity at the end of irradiation Reactor Irradiation Beam Irradiation N: Total no. of target atoms Target atoms per unit area : Flux (neutrons.cm-2.sec-1) Intensity (particles.sec-1) : Cross section Tirr: Duration of irradiation : Decay constant of product radionuclide

a : Gamma-ray abundance E : Detection Efficiency Assay of gamma-ray activity after cooling time TC a : Gamma-ray abundance E : Detection Efficiency Peak area  Activity  Cross section Particle telescopes Monitor Target Beam Coincident measurements Online charge particle measurement using E-E detectors

NUCLEAR FISSION STUDIES Mass & Charge distribution in neutron induced fission of Actinides 238U, 237Np, 238-241Pu, 241Am, 243Am, 244-245Cm Off-line gamma ray spectrometry Radiochemical separations, in some cases Nucl. Phys. A 781 (2007) 1 Nucl. Phys. A 612 (1997) 143 J. Phys. G. 30 (2004) 107 Eur. Phys. J. A 7 (2003) 495. Elemental Yields in neutron induced fission

Heavy ion induced fission , p induced fission Medium heavy ion induced fission ( ion beams of isotopes of Li, B, C, O, Ne…) Both online and off-line measurements Mass, charge, angular and mass resolved angular distributions To investigate transfer induced fission To understand the correlation between mass asymmetry and angular anisotropy Phys. Rev. C 71 (2005) 044616 Eur. Phys. A. 26 (2005) 1434 Phys. Rev.C, 74 (2006) 014610

CM AD of fission fragments in 11B+243Am reaction 20Ne+208Pb at 114 MeV Phys. Rev. C 69 (2004)024613 Phys. Rev. C 75 (2007) 024609

Mass distribution in 7Li+232Th Radiochim. Acta. 90(4) (2002) 185.

Angular anisotropy in 19F+197Au

Nuclear Spectroscopic Data Gamma ray abundances of 194Tlg Radio. Chim. Acta. 91(2003)1 Gamma-ray abundance of capture -rays from 60Co Nucl. Instr. Meth. A. 457 (2001) 180.

Gamma ray abundances in the Alpha decay of 229Th Phys. Rev. C. 27 (1983)327

NEUTRON ACTIVATION ANALYSIS Data use and determination for analytical purposes NEUTRON ACTIVATION ANALYSIS For neutron induced reactions VC=0 It enters all nuclei and binds to it. CN is in excited state. PGAA A+1X NAA A+1X Z+1 NEUTRON INTERACTION OFTEN PRODUCES RADIOISOTOPES : ENTIRE PERIODIC TABLE CHARACTERISTIC RADIATIONS, e.g., GAMMA RAYS ARE MEASURED : CONCN. OF ISOTOPES (ELEMENTS)

STANDARDIZATION METHODS OF NAA Absolute method Relative method (comparative) Ratios of count rates in standard and sample Single comparator (k0-method) Co-irradiation of sample with a mono standard (e.g., Au, Mn, Sc)

k0-methodology & Calculations Determination of  and f by cadmium ratio or bare detectors: 197Au and 94,96Zr k0- factors determined as well as computed J. Radioanal. Nucl. Chem 256 (2003) 93 Anal. Chem.75(2003)4868 J. Nucl. Mat 326 (2004) 80 Anal. Chim. Acta 522(2004)127 Appl. Radiat. Isot. 65(2007)164

In-situ efficiency calibration – Determination of relative amounts without use of standard Standard-less composition analysis of nuclear cladding materials: Zircaloy 2 and 4, Stainless Steel and 1S-Aluminium

Prompt gamma-ray Neutron Activation Analysis J. Radioanal. Nucl. Chem 250 (2001) 303, NUcl. Instr. Meth.A 457 ( 2001) 180, Anal. Chim. Acta 535 (2004) 309, Anal. Chim. Acta 595 (2005) 2005

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