V. Jakovlev, L. Lebedev and L. Solin V.G. Khlopin Radium Institute

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Presentation transcript:

V. Jakovlev, L. Lebedev and L. Solin V.G. Khlopin Radium Institute Neutron radiation hardness tests of silicon micro-strip detectors for CBM STS at KRI cyclotron V. Jakovlev, L. Lebedev and L. Solin V.G. Khlopin Radium Institute

Plan of the presentation Be-target neutron irradiations Reasons of replacement Be(p,n) reaction with D(d,n) one D2-gas target D(d,n) neutron spectra calculations Effect of D2-gas density reduction Neutron hardness tests of SMSD

KRI cyclotron (MGC-20) MGC-20 cyclotrons are manufactured by the Efremov Electro-Technical Institute. Beam types (external): Protons: 8 – 18 MeV, i < 50 mA; Deutrons: 4 – 10 MeV, Helium-3: 10 – 27 MeV, i < 25 mA; Helium-4: 10 – 20 MeV, i < 25 mA. Geography of MGC-20: St. Petersburg (Russia) – 3 Turku (Finland) Debrecen (Hungary) Cairo (Egypt) Somewheretown (North Korea).

Be-target neutron irradiations 9Be(p,n)9B, Q = -1.85 MeV, Tp = 2.06 MeV

Computer program (example)

Cross sections of NAA-reactions to monitor neutron flux

Table 3. Discrepancies of neutron flux for different NAA-reactions. Results Table 3. Discrepancies of neutron flux for different NAA-reactions. Reaction Threshold, MeV 27Al(n,p)27Mg 1.90 124 238U(n,2n)237U 6.18 - “ - 21 27Al(n,a)24Na 3.25 23 197Au(n,2n)197Au 8.11 36 93Nb (n,2n) 92Nb 8.93 6 140Ce(n,2n)139Ce 9.27 -11 142Nd(n,2n)141Nd 9.90 -21 63Cu (n,2n) 62Cu 11.03 10

Experimental and calculated Be-target neutron spectra [Lone et. al: “Thick target neutron yields and spectral distributions from the 7Li(p/d,n) and 9Be(p/d,n) reactions” NIM 143 (1977) 331]

Smoothed ratio of the experimental and calculated neutron spectra

Corrected neutron spectra

Types of neutron spectra Four types of neutron spectra: From 9Be(p,n)9B(g.s.) reaction From 9Be(p,n)9B* reaction From accompanying reactions: Background of neutrons scattered on walls and floor of experimental room 9Be + p  4He + 5Li + n – 3.5 MeV  8Be + p + n – 1.7 MeV  2 4He + p + n – 1.6 MeV

Drosg-2000 and ENDF/B-VII Data

Cross sections of the 9Be(p,n)9B* reactions [ http://t2.lanl.gov/data/proton7.html ]

D(d,n)3He reaction Q = 3.269 MeV [ http://t2.lanl.gov/data/deuteron.html ]

D2-gas target 7.75 MeV 3.79 MeV 4.77 MeV D2-gas pressure = 2.4 ÷ 3 atm Beam current = 8 ÷ 12 mA

Neutron spectrum program modified for gas target

Neutron spectra for Be-disk and D2-gas target systems

D2-gas density reduction - - - [S.-J. Heselius, Studies of Density Reduction in Gas Targets, Academic Dissertation, Åbo Akademi, Turku, Finland, 1986]

Background neutron flux determination D2 was replaced with H2. Irradiation conditions, Al and Ti samples were the same as in D2-irradiation. Main part of background neutron flux belongs to natW(d,n) (Q = 2.6 ÷ 3.8 MeV) and 181Ta(d,n) (Q = 4.87 MeV) reactions going in the window and beam stopper materials. As result activities of samples were about 0.5% from the D2-irradiation respective values.

Neutron hardness tests of SMSD Table. Neutron fluxes for different detectors. Irradiation number Detector number Exposure, h 49-52 67, 68, 69 31.5 52 60,61-,61+ 18 49-54 64, 65, 66 42.5 52-54 40,41-,41+ 29 52-66 50,51-,51+ 150 Difference between Al and Ti NAA-monitors < 5% Neutron flux error ±10%

Thank you for your attention!

Neutron spectra calculations

Derivative of solid angle with respect to reaction angle for the coaxial disks geometry

Noncoaxial geometries

Neutron spectra calculations in frame of ISTC-project No 176 (1995-1997)

Computer program (example)

Comparison with the Monte-Carlo method

Background neutrons Lone et. al: “Thick target neutron yields and spectral distributions from the 7Li(p/d,n) and 9Be(p/d,n) reactions” NIM 143 (1977) 331