225 research outputs found
Systematic Study of Two-Pion Production in NN Collisions -- from Single-Baryon to Di-Baryon Excitations
The two-pion production in nucleon-nucleon collisions has been studied by
exclusive and kinematically complete experiments from threshold up to =
1.36 GeV at CELSIUS-WASA. At near-threshold energies the total and differential
distributions for the and channels are dominated by
Roper excitation and its decay into and channels. At beam
energies 1.1 GeV the excitation governs the two-pion
production process. In the channel evidence is found for the
excitation of a higher-lying I=3/2 resonance, favorably the . The
isovector fusion processes leading to the deuteron and to quasi-stable He,
respectively, %with the production of an isovector pion-pair exhibit no or only
a modest ABC-effect, {\it i.e.} low-mass enhancement in the -invariant
mass spectrum, and can be described by conventional -channel
excitation. On the other hand, the isoscalar fusion process to the deuteron
%with the production of an isoscalar pion-pair exhibits a dramatic ABC-effect
correlated with a narrow resonance-like energy dependence in the total cross
section with a width of only 50 MeV and situated at a mass 90 MeV below the
mass.Comment: Proceedings HADRON0
Anisotropy in the pion angular distribution of the reaction pp -> pp pi0 at 400 MeV
The reaction pp -> pp pi0 was studied with the WASA detector at the CELSIUS
storage ring. The center of mass angular distribution of the pi0 was obtained
by detection of the gamma decay products together with the two outgoing
protons, and found to be anisotropic with a negative second derivative slope,
in agreement with the theoretical predictions from a microscopic calculation.Comment: Revtex 4 style, 5 pages 7 figures, PACS numbers:13.60.Le, 13.75.Cs,
21.45.+v, 25.10.+
ΠΠ»ΠΈΡΠ½ΠΈΠ΅ ΡΠΎΠ»ΡΠΈΠ½Ρ ΠΎΡΠ²Π΅ΡΠΆΠ΄Π°Π΅ΠΌΠΎΠ³ΠΎ ΡΠ»ΠΎΡ ΡΠΎΡΠΎΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠ½ΠΎΠΉ ΡΠΌΠΎΠ»Ρ ΠΏΡΠΈ SLA-ΡΠ΅Ρ Π½ΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΏΠ΅ΡΠ°ΡΠΈ Π½Π° ΡΠΏΡΡΠ³ΠΈΠ΅ ΠΈ ΠΏΡΠΎΡΠ½ΠΎΡΡΠ½ΡΠ΅ Ρ Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠ½ΡΡ ΠΈΠ·Π΄Π΅Π»ΠΈΠΉ Π°Π΄Π΄ΠΈΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π°
The possibility of using dynamic indentation method for measurement the elastic and strength properties of polymer products obtained by additive synthesis using the SLA-technology is considered. The sensitivity of the method to changes in hardness, tensile strength, and elastic modulus of products obtained by different printing modes with a thickness of the cured layer of photopolymer resin of 100, 50, and 25 microns has been estimated. A comparison is made of two main methods for calculating the physical and mechanical characteristics of a material according to the data of its impact loading diagram: an adapted classical method of mechanics of contact interaction, considering the geometric parameters of the deformed region of the material, and a method based on the energy characteristics of shock interaction. It was found that the highest sensitivity of the dynamic indentation method to changes in the properties of the additive polymer, depending on the thickness of its hardened layer, is provided when using an energy computational model for evaluating the properties of the material. The results obtained are the basis for the methods of non-destructive testing of polymer products of additive manufacturing by the method of dynamic indentation. The implementation of these techniques in portable measuring equipment is an alternative to standard destructive tests and will allow obtaining reliable data on the properties of the controlled material without the need to manufacture special witness samples.Π Π°ΡΡΠΌΠΎΡΡΠ΅Π½Π° Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΠ½Π΄Π΅Π½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΏΡΡΠ³ΠΈΡ
ΠΈ ΠΏΡΠΎΡΠ½ΠΎΡΡΠ½ΡΡ
ΡΠ²ΠΎΠΉΡΡΠ² ΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠ½ΡΡ
ΠΈΠ·Π΄Π΅Π»ΠΈΠΉ, ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΡ
ΠΏΡΡΠ΅ΠΌ Π°Π΄Π΄ΠΈΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΡΠΈΠ½ΡΠ΅Π·Π° ΠΏΠΎ SLA-ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΈ. ΠΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΎΡΠ΅Π½ΠΊΠ° ΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΠΌΠ΅ΡΠΎΠ΄Π° ΠΊ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΡΠ²Π΅ΡΠ΄ΠΎΡΡΠΈ, ΠΏΡΠ΅Π΄Π΅Π»Π° ΠΏΡΠΎΡΠ½ΠΎΡΡΠΈ ΠΈ ΠΌΠΎΠ΄ΡΠ»Ρ ΡΠΏΡΡΠ³ΠΎΡΡΠΈ ΠΈΠ·Π΄Π΅Π»ΠΈΠΉ, Π²ΡΡΠ°ΡΠ΅Π½Π½ΡΡ
ΠΏΠΎ ΡΠ°Π·Π»ΠΈΡΠ½ΡΠΌ ΡΠ΅ΠΆΠΈΠΌΠ°ΠΌ ΠΏΠ΅ΡΠ°ΡΠΈ Ρ ΡΠΎΠ»ΡΠΈΠ½ΠΎΠΉ ΠΎΡΠ²Π΅ΡΠΆΠ΄Π°Π΅ΠΌΠΎΠ³ΠΎ ΡΠ»ΠΎΡ ΡΠΎΡΠΎΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠ½ΠΎΠΉ ΡΠΌΠΎΠ»Ρ Π² 100, 50 ΠΈ 25 ΠΌΠΊΠΌ. ΠΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΠ΅ Π΄Π²ΡΡ
ΠΎΡΠ½ΠΎΠ²Π½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊ ΡΠ°ΡΡΠ΅ΡΠ° ΡΠΈΠ·ΠΈΠΊΠΎ-ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° ΠΏΠΎ Π΄Π°Π½Π½ΡΠΌ Π΄ΠΈΠ°Π³ΡΠ°ΠΌΠΌΡ Π΅Π³ΠΎ ΡΠ΄Π°ΡΠ½ΠΎΠ³ΠΎ Π½Π°Π³ΡΡΠΆΠ΅Π½ΠΈΡ: Π°Π΄Π°ΠΏΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΠΊΠ»Π°ΡΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠΈ ΠΌΠ΅Ρ
Π°Π½ΠΈΠΊΠΈ ΠΊΠΎΠ½ΡΠ°ΠΊΡΠ½ΠΎΠ³ΠΎ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡ, ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡΠ΅ΠΉ Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΡ Π΄Π΅ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°, ΠΈ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠΈ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠ½Π΅ΡΠ³Π΅ΡΠΈΡΠ΅ΡΠΊΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΡΠ΄Π°ΡΠ½ΠΎΠ³ΠΎ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ Π½Π°ΠΈΠ±ΠΎΠ»ΡΡΠ°Ρ ΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡ ΠΌΠ΅ΡΠΎΠ΄Π° Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΠ½Π΄Π΅Π½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΊ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΡΠ²ΠΎΠΉΡΡΠ² Π°Π΄Π΄ΠΈΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠ° Π² Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ ΡΠΎΠ»ΡΠΈΠ½Ρ Π΅Π³ΠΎ ΠΎΡΠ²Π΅ΡΠΆΠ΄Π°Π΅ΠΌΠΎΠ³ΠΎ ΡΠ»ΠΎΡ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠΈΠ²Π°Π΅ΡΡΡ ΠΏΡΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ ΡΠ½Π΅ΡΠ³Π΅ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ°ΡΡΠ΅ΡΠ½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΎΡΠ΅Π½ΠΊΠΈ ΡΠ²ΠΎΠΉΡΡΠ² ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°. ΠΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ β ΠΎΡΠ½ΠΎΠ²Π° ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊ Π½Π΅ΡΠ°Π·ΡΡΡΠ°ΡΡΠ΅Π³ΠΎ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ ΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠ½ΡΡ
ΠΈΠ·Π΄Π΅Π»ΠΈΠΉ Π°Π΄Π΄ΠΈΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π° ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΠ½Π΄Π΅Π½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ. Π Π΅Π°Π»ΠΈΠ·Π°ΡΠΈΡ Π΄Π°Π½Π½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊ Π² ΠΏΠΎΡΡΠ°ΡΠΈΠ²Π½ΠΎΠΉ ΠΈΠ·ΠΌΠ΅ΡΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΡΠ΅Ρ
Π½ΠΈΠΊΠ΅ ΡΠ²Π»ΡΠ΅ΡΡΡ Π°Π»ΡΡΠ΅ΡΠ½Π°ΡΠΈΠ²ΠΎΠΉ ΡΡΠ°Π½Π΄Π°ΡΡΠ½ΡΠΌ ΡΠ°Π·ΡΡΡΠ°ΡΡΠΈΠΌ ΠΈΡΠΏΡΡΠ°Π½ΠΈΡΠΌ ΠΈ ΠΏΠΎΠ·Π²ΠΎΠ»ΠΈΡ ΠΏΠΎΠ»ΡΡΠΈΡΡ Π΄ΠΎΡΡΠΎΠ²Π΅ΡΠ½ΡΠ΅ Π΄Π°Π½Π½ΡΠ΅ ΠΎ ΡΠ²ΠΎΠΉΡΡΠ²Π°Ρ
ΠΊΠΎΠ½ΡΡΠΎΠ»ΠΈΡΡΠ΅ΠΌΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° Π±Π΅Π· Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΠΈ ΠΈΠ·Π³ΠΎΡΠΎΠ²Π»Π΅Π½ΠΈΡ ΡΠΏΠ΅ΡΠΈΠ°Π»ΡΠ½ΡΡ
ΠΎΠ±ΡΠ°Π·ΡΠΎΠ²-ΡΠ²ΠΈΠ΄Π΅ΡΠ΅Π»Π΅ΠΉ
ΠΡΠ΅Π½ΠΊΠ° ΠΏΠΎΠ³ΡΠ΅ΡΠ½ΠΎΡΡΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΠΈΠ·ΠΈΠΊΠΎ-ΠΌΠ΅Ρ Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ Ρ Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² ΠΏΡΠΈ ΠΈΡ ΠΊΠΎΠ½ΡΡΠΎΠ»Π΅ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΠΈΠ½Π΄Π΅Π½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ
The active application in the practice of testing the indentation methods, in particular to measure the physical and mechanical properties of metals, polymers, biological technologies demands to development techniques for the measurement error estimation. At the same time existing traditional measurement error evaluation system, based on the using of the reference blocks, is not always suitable for use in testing and research laboratories. The aim of this work was development the technique for estimating the indirect measurements error of materials physical and mechanical characteristics that can be applied in practice and based on the existing standards. Checking of the proposed approach using the experimental values of the hardness and elastic modulus obtained during static indentation for various metals.It is shown that since the initial information about the material is an indentation curve representing the dependence of the load versus penetration depth of the indenter into the material tested, then it is better to confirm the metrological characteristics of the indentation measuring devices using the applied force and achieved displacement, but to estimate the accuracy of determining the properties through the error of indirect measurements. The equations for calculating the hardness and modulus of elasticity are derived. It allows to determine the component value most influencing the error magnitude. The calculation of error on the base of the value of boundary of a random and non-exclusive systematic error was carrying out.The advantage of the developed technique is the fact that the measurement of the physical and mechanical characteristics is based on the experimental data and does not require the creation of the additional metrological assurance. The proposed approach seems appropriate to extend for the determination of the measurement error of other characteristics: the yield point, the strain hardening exponent, creep, relaxation, determined by the indentation methods.ΠΠΊΡΠΈΠ²Π½ΠΎΠ΅ Π²Π½Π΅Π΄ΡΠ΅Π½ΠΈΠ΅ Π² ΠΏΡΠ°ΠΊΡΠΈΠΊΡ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΠΈΠ½Π΄Π΅Π½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ, Π² ΡΠ°ΡΡΠ½ΠΎΡΡΠΈ Π΄Π»Ρ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ ΡΠΈΠ·ΠΈΠΊΠΎ-ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΌΠ΅ΡΠ°Π»Π»ΠΎΠ², ΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠΎΠ², Π±ΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠΊΠ°Π½Π΅ΠΉ ΡΡΠ΅Π±ΡΠ΅Ρ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠΈ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊ ΠΎΡΠ΅Π½ΠΊΠΈ ΠΏΠΎΠ³ΡΠ΅ΡΠ½ΠΎΡΡΠΈ ΠΏΠΎΠ»ΡΡΠ°Π΅ΠΌΡΡ
ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ². ΠΡΠΈ ΡΡΠΎΠΌ ΡΠ»ΠΎΠΆΠΈΠ²ΡΠ°ΡΡΡ ΡΡΠ°Π΄ΠΈΡΠΈΠΎΠ½Π½Π°Ρ ΡΠΈΡΡΠ΅ΠΌΠ° ΠΎΡΠ΅Π½ΠΊΠΈ ΠΏΠΎΠ³ΡΠ΅ΡΠ½ΠΎΡΡΠΈ Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ΠΌ ΠΌΠ΅Ρ Π½Π΅ Π²ΡΠ΅Π³Π΄Π° ΠΏΡΠΈΠ³ΠΎΠ΄Π½Π° Π΄Π»Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π² ΠΈΡΠΏΡΡΠ°ΡΠ΅Π»ΡΠ½ΡΡ
ΠΈ Π½Π°ΡΡΠ½ΠΎ-ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΠ΅Π»ΡΡΠΊΠΈΡ
Π»Π°Π±ΠΎΡΠ°ΡΠΎΡΠΈΡΡ
. Π¦Π΅Π»ΡΡ Π΄Π°Π½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΡ ΡΠ²Π»ΡΠ»Π°ΡΡ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ° ΠΏΡΠΈΠΌΠ΅Π½ΠΈΠΌΠΎΠΉ Π½Π° ΠΏΡΠ°ΠΊΡΠΈΠΊΠ΅ ΠΈ ΠΎΠΏΠΈΡΠ°ΡΡΠ΅ΠΉΡΡ Π½Π° ΠΎΡΠ΅ΡΠ΅ΡΡΠ²Π΅Π½Π½ΡΡ Π½ΠΎΡΠΌΠ°ΡΠΈΠ²Π½ΡΡ Π±Π°Π·Ρ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠΈ ΠΎΡΠ΅Π½ΠΊΠΈ ΠΏΠΎΠ³ΡΠ΅ΡΠ½ΠΎΡΡΠΈ ΠΊΠΎΡΠ²Π΅Π½Π½ΡΡ
ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΠΉ ΡΠΈΠ·ΠΈΠΊΠΎ-ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² ΠΈ ΠΏΡΠΎΠ²Π΅ΡΠΊΠ° ΠΏΡΠ΅Π΄Π»Π°Π³Π°Π΅ΠΌΠΎΠ³ΠΎ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄Π° Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
Π·Π½Π°ΡΠ΅Π½ΠΈΠΉ ΡΠ²Π΅ΡΠ΄ΠΎΡΡΠΈ ΠΈ ΠΌΠΎΠ΄ΡΠ»Ρ ΡΠΏΡΡΠ³ΠΎΡΡΠΈ, ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΡ
ΠΏΡΠΈ ΡΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΌ ΠΈΠ½Π΄Π΅Π½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ Π΄Π»Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΌΠ΅ΡΠ°Π»Π»ΠΎΠ².ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΠΏΠΎΡΠΊΠΎΠ»ΡΠΊΡ ΠΏΠ΅ΡΠ²ΠΈΡΠ½ΡΠΌ ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠΎΠΌ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π΅ ΡΠ²Π»ΡΠ΅ΡΡΡ Π΄ΠΈΠ°Π³ΡΠ°ΠΌΠΌΠ° Π²Π΄Π°Π²Π»ΠΈΠ²Π°Π½ΠΈΡ, ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»ΡΡΡΠ°Ρ ΡΠΎΠ±ΠΎΠΉ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΡ Π½Π°Π³ΡΡΠ·ΠΊΠΈ ΠΎΡ Π³Π»ΡΠ±ΠΈΠ½Ρ Π²Π½Π΅Π΄ΡΠ΅Π½ΠΈΡ ΠΈΠ½Π΄Π΅Π½ΡΠΎΡΠ° Π² ΠΈΡΡΠ»Π΅Π΄ΡΠ΅ΠΌΡΠΉ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π», ΡΠΎ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠΆΠ΄Π΅Π½ΠΈΠ΅ ΠΌΠ΅ΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΈΠ·ΠΌΠ΅ΡΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΡΠ΅Ρ
Π½ΠΈΠΊΠΈ, ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΡΡΠ΅ΠΉΡΡ Π΄Π»Ρ ΠΈΠ½Π΄Π΅Π½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ, Π»ΡΡΡΠ΅ ΠΎΡΡΡΠ΅ΡΡΠ²Π»ΡΡΡ ΠΏΠΎ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠ°ΠΌ ΡΠ°Π·Π²ΠΈΠ²Π°Π΅ΠΌΠΎΠ³ΠΎ ΡΡΠΈΠ»ΠΈΡ ΠΈ ΠΏΠ΅ΡΠ΅ΠΌΠ΅ΡΠ΅Π½ΠΈΡ, Π° ΡΠΎΡΠ½ΠΎΡΡΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΠ²ΠΎΠΉΡΡΠ² ΠΎΡΠ΅Π½ΠΈΠ²Π°ΡΡ ΡΠ΅ΡΠ΅Π· ΠΏΠΎΠ³ΡΠ΅ΡΠ½ΠΎΡΡΡ ΠΊΠΎΡΠ²Π΅Π½Π½ΡΡ
ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΠΉ. ΠΡΠΈΠ²Π΅Π΄Π΅Π½Ρ ΠΎΡΠ½ΠΎΠ²Π½ΡΠ΅ ΡΠΎΡΠΌΡΠ»Ρ Π΄Π»Ρ ΡΠ°ΡΡΠ΅ΡΠ° ΡΠ²Π΅ΡΠ΄ΠΎΡΡΠΈ ΠΈ ΠΌΠΎΠ΄ΡΠ»Ρ ΡΠΏΡΡΠ³ΠΎΡΡΠΈ, ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡΠΈΠ΅ ΡΡΡΠ°Π½ΠΎΠ²ΠΈΡΡ Π²Π΅Π»ΠΈΡΠΈΠ½Ρ, Π½Π°ΠΈΠ±ΠΎΠ»ΡΡΠΈΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠΌ Π²Π»ΠΈΡΡΡΠΈΠ΅ Π½Π° Π²Π΅Π»ΠΈΡΠΈΠ½Ρ ΠΏΠΎΠ³ΡΠ΅ΡΠ½ΠΎΡΡΠΈ. Π Π°ΡΡΠ΅Ρ ΠΏΠΎΠ³ΡΠ΅ΡΠ½ΠΎΡΡΠΈ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ΅ΠΌΡΡ
Π³ΡΠ°Π½ΠΈΡ ΡΠ»ΡΡΠ°ΠΉΠ½ΠΎΠΉ ΠΈ Π½Π΅ΠΈΡΠΊΠ»ΡΡΠ΅Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΠΎΠ³ΡΠ΅ΡΠ½ΠΎΡΡΠΈ.ΠΠΎΡΡΠΎΠΈΠ½ΡΡΠ²ΠΎΠΌ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π½ΠΎΠΉ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠΈ ΡΠ²Π»ΡΠ΅ΡΡΡ ΡΠΎΡ ΡΠ°ΠΊΡ, ΡΡΠΎ ΠΎΡΠ΅Π½ΠΊΠ° ΡΠΎΡΠ½ΠΎΡΡΠΈ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΠΉ ΡΠΈΠ·ΠΈΠΊΠΎ-ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΠΈΡΡΡ Π½Π° ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΈΠΈ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
Π΄Π°Π½Π½ΡΡ
ΠΈ Π½Π΅ ΡΡΠ΅Π±ΡΠ΅Ρ ΡΠΎΠ·Π΄Π°Π½ΠΈΡ Π΄ΠΎΠΏΠΎΠ»Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΡ. ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π½ΡΠΉ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»ΡΠ΅ΡΡΡ ΡΠ΅Π»Π΅ΡΠΎΠΎΠ±ΡΠ°Π·Π½ΡΠΌ ΡΠ°ΡΠΏΡΠΎΡΡΡΠ°Π½ΠΈΡΡ Π½Π° ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΠΏΠΎΠ³ΡΠ΅ΡΠ½ΠΎΡΡΠΈ Π΄ΡΡΠ³ΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ: ΠΏΡΠ΅Π΄Π΅Π»Π° ΡΠ΅ΠΊΡΡΠ΅ΡΡΠΈ, ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»Ρ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΡΠΏΡΠΎΡΠ½Π΅Π½ΠΈΡ, ΠΏΠΎΠ»Π·ΡΡΠ΅ΡΡΠΈ, ΡΠ΅Π»Π°ΠΊΡΠ°ΡΠΈΠΈ, ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ΅ΠΌΡΡ
ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ ΠΈΠ½Π΄Π΅Π½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ
Exclusive Measurements of pp -> dpi+pi0: Double-Pionic Fusion without ABC Effect
Exclusive measurements of the reaction pp -> dpi+pi0 have been carried out at
T_p = 1.1 GeV at the CELSIUS storage ring using the WASA detector. The
isovector pi+pi0 channel exhibits no enhancement at low invariant pipi masses,
i. e. no ABC effect. The differential distributions are in agreement with the
conventional t-channel Delta-Delta excitation process, which also accounts for
the observed energy dependence of the total cross section. This is an update of
a previously published version -- see important note at the end of the article
Double-Pionic Fusion of Nuclear Systems and the ABCEffect -- Aproaching a Puzzle by Exclusive and Kinematically Complete Measurements
The ABC effect - a puzzling low-mass enhancement in the invariant
mass spectrum - is well-known from inclusive measurements of two-pion
production in nuclear fusion reactions. Here we report on first exclusive and
kinematically complete measurements of the most basic double pionic fusion
reaction at 1.03 and 1.35 GeV. The measurements, which
have been carried out at CELSIUS-WASA, reveal the ABC effect to be a
channel phenomenon associated with both a resonance-like
energy dependence in the integral cross section and the formation of a
system in the intermediate state. A corresponding simple
s-channel resonance ansatz provides a surprisingly good description of the
data
Polarisation of the omega meson in the pd-->3He+omega reaction at 1360 and 1450 MeV
The tensor polarisation of omega mesons produced in the pd-->3He+omega
reaction has been studied at two energies near threshold. The 3He nuclei were
detected in coincidence with the pi0pi+pi- or pi0gamma decay products of the
omega. In contrast to the case of phi meson production, the omega mesons are
found to be unpolarised. This brings into question the applicability of the
Okubo-Zweig-Iizuka rule when comparing the production of vector mesons in low
energy hadronic reactions.Comment: 11 pages, 4 figure
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