Study of the radiation hardness of CsI(Tl) scintillation crystals Beylin, D.M.; Korchagin, A.I.; Kuzmin, A.S. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/2005, Volume:
541, Issue:
3
Journal Article
Peer reviewed
Open access
This paper is devoted to the study of a degradation of CsI(Tl) crystals’ scintillation characteristics under irradiation with gamma-rays at the uniformly distributed absorbed dose up to 3700
rad. The ...sample set consisted of 25 crystals of 30
cm long having a truncated pyramid shape and 30 rectangular crystals of the same length. A large difference in the light output deterioration caused by the radiation was observed for the samples of the same shape. A substantial dependence of the average light output loss from the sample shape is seen as well. On the other hand, the crystals from the same ingot behave very similarly under irradiation.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
The cross-section of the process e+e−→π+π− has been measured using about 114000 events collected by the CMD-2 detector at the VEPP-2M e+e− collider in the center-of-mass energy range from 0.61 to ...0.96 GeV. Results of the pion form factor determination with a 0.6% systematic uncertainty are presented. The following values of the ρ- and ω-meson parameters were found: Mρ=(776.09±0.81) MeV, Γρ=(144.46±1.55) MeV, Γ(ρ→e+e−)=(6.86±0.12) keV, Br(ω→π+π−)=(1.33±0.25)%. Implications for the hadronic contribution to the muon anomalous magnetic moment are discussed.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Status of the KEDR detector Anashin, V.V; Aulchenko, V.M; Baibusinov, B.O ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2002, Volume:
478, Issue:
1
Journal Article
Peer reviewed
KEDR is a general-purpose detector for experiments at the VEPP-4M e
+e
−-collider in the energy range 2
E=2.0–
12
GeV
. All detector subsystems (except the aerogel Cherenkov counters) have been ...installed into the detector at VEPP-4M. Some preliminary data have been taken in the energy region of the J/Ψ meson. The tuning of the detector and the VEPP-4M collider is in progress. Preliminary results on the detector performance are presented. The future experimental program for the KEDR detector is discussed.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
The theoretical design and the experimental design and development of multifunctional radiation-absorbing composite material systems based on gadolinium, boron, and tungsten has been carried out. ...Based on theoretical calculations, the effective compositions of these composite subsystems were established for the enhanced absorption of neutron and
γ
irradiation in various energy spectra. In addition, the systems and systems compositions were designed and processed for enhanced multifunctional performance. Selected and optimized compositions of Gd-B-W system were densified by shock wave consolidation technology. The technological parameters for the explosive consolidation processes and the structure-properties relationships are presented and discussed. The radiation-absorbing properties of the bulk samples were investigated and measured under neutron and gamma irradiation. The theoretical design and the optimization of these composite systems were carried out by the Monte Carlo method with a GEANT 3 program, which contained a special GCALOR package for the simulation of the interaction of thermal and fast neutrons with the composite material systems. During the neutron passage through the samples, the main processes of the interaction of neutrons with matter were considered including elastic and inelastic scattering, neutron fission of nuclei, and radiation capture. The attenuation factor of the irradiation flux is determined as a criterion of efficiency of radiation absorption. For the energy of 0.025 eV (thermal neutrons), gadolinium-containing composites have the maximum absorption capability. In the range of energy spectrum from 1 eV to 10 eV, the boron-containing composites have better absorption performance. For the capture of neutrons in wide energy spectrum, the (
n
,
γ
) reaction takes place and tungsten provides enhanced absorption of radiation. In the presence of mixed radiation sources (neutron and
γ
quanta), the boron- and gadolinium-containing composite materials prepared on the tungsten basis have the best performance. In addition to enhanced radiation absorption properties, these composite systems show also enhancement on other properties such as corrosion resistance in aggressive media.
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CEKLJ, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The updated results of the precise measurements of the processes e+e−→ρ→π+π−, e+e−→ω→π+π−π0 and e+e−→φ→K0LK0S performed by the CMD-2 Collaboration are presented. The update appeared necessary due to ...an overestimate of the integrated luminosity in previous analyses.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Using 3.07 pb
−1 of data collected in the energy range 0.60–0.97 GeV by CMD-2, about 150 events of the process e
+e
−→
π
+
π
−
π
+
π
− have been selected. The energy dependence of the cross section ...agrees with the assumption of the
a
1(1260)
π intermediate state which is dominant above 1 GeV. For the first time
π
+
π
−
π
+
π
− events are observed at the
ρ meson energy. Under the assumption that all these events come from the
ρ meson decay, the value of the cross section at the
ρ meson peak corresponds to the following decay width:
Γ(ρ
0→π
+π
−π
+π
−)=(2.8±1.4±0.5)
keV
or to the branching ratio
B(ρ
0→π
+π
−π
+π
−)=(1.8±0.9±0.3)·10
−5.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Using 15.1 pb
−1 of data collected by CMD-2 in the
φ-meson energy range, the branching ratios of the following conversion decays have been measured:
B(
φ→
ηe
+
e
−)=(1.14±0.10±0.06)×10
−4,
B(
η→
e
+
...e
−
γ)=(7.10±0.64±0.46)×10
−3,
B(
η→
π
+
π
−
e
+
e
−)=(3.7
+2.5
−1.8±0.3)×10
−4. The upper limits for the following rare conversion decays have been obtained at the 90% confidence level:
B(
φ→
ημ
+
μ
−)<9.4×10
−6,
B(
η→
e
+
e
−
e
+
e
−)<6.9×10
−5.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Using the
1.9
pb
−1
of data collected with the CMD-2 detector at VEPP-2M the decay mode
φ→
ηγ,
η→
π
+
π
−
π
0 has been studied. The obtained branching ratio is B(
φ→
ηγ)=(1.18±0.03±0.06)%.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
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