scholarly journals Accurate determination of production data of the non-standard positron emitter 86Y via the 86Sr(p,n)-reaction

2020 ◽  
Vol 108 (9) ◽  
pp. 747-756
Author(s):  
M. Shuza Uddin ◽  
Bernhard Scholten ◽  
M. Shamsuzzhoha Basunia ◽  
Sandor Sudár ◽  
Stefan Spellerberg ◽  
...  
Keyword(s):  
Cross Section ◽  
Irradiation Time ◽  
Accurate Determination ◽  
Nuclear Model ◽  
Scale Production ◽  
Reaction Products ◽  
Cross Section Data ◽  
Section Data ◽  
Positron Emitter ◽  
The Cross

AbstractIn view of several significant discrepancies in the excitation function of the 86Sr(p,n)86g+xmY reaction which is the method of choice for the production of the non-standard positron emitter 86Y for theranostic application, we carried out a careful measurement of the cross sections of this reaction from its threshold up to 16.2 MeV at Forschungszentrum Jülich (FZJ) and from 14.3 to 24.5 MeV at LBNL. Thin samples of 96.4% enriched 86SrCO3 were prepared by sedimentation and, after irradiation with protons in a stacked-form, the induced radioactivity was measured by high-resolution γ-ray spectrometry. The projectile flux was determined by using the monitor reactions natCu(p,xn)62,63,65Zn and natTi(p,x)48V, and the calculated proton energy for each sample was verified by considering the ratios of two reaction products of different thresholds. The experimental cross section data obtained agreed well with the results of a nuclear model calculation based on the code TALYS. From the cross section data, the integral yield of 86Y was calculated. Over the optimum production energy range Ep = 14 → 7 MeV the yield of 86Y amounts to 291 MBq/μA for 1 h irradiation time. This value is appreciably lower than the previous literature values calculated from measured and evaluated excitation functions. It is, however, more compatible with the experimental yields of 86Y obtained in clinical scale production runs. The levels of the isotopic impurities 87mY, 87gY, and 88Y were also estimated and found to be <2% in sum.

Visual Processing of the River Cross-Sectional Data

2012 ◽  
Vol 204-208 ◽  
pp. 2726-2730
Author(s):  
Qi Qing Duan ◽  
Rui Hai Wu
Keyword(s):  
Data Processing ◽  
Cross Section ◽  
Visual Processing ◽  
Measurement Data ◽  
Measurement Process ◽  
Cross Section Data ◽  
Section Data ◽  
Section Line ◽  
Straight Line ◽  
The Cross

The cross-section of Hydraulic engineering (river, embankment) is a kind of cross section which is always perpendicular to the river direction. Section line is a straight line which is created by connecting two endpoint of the section. Cross-section measurements is that collecting a coordinate point (X, Y, H) on the section line every a certain distance. Field measurement, due to the influence of the external environment, especially when measured in the river, is difficult to ensure that the location of the measurement point exactly on the straight line shown in the section. The reason is that tracking ship traveling along with the section will be impacted by the water, resulting in the offset along the flow direction. Therefore we must to constantly adjust the direction of travel in the measurement process. For which the measurement data should be processed. So it is necessary to deal with the measurement data, and the idea of visual data was proposed in the paper, which is easier to analyze the accuracy of the measurement data. The BUFFER analysis method was used in the data processing, which effectively removed measurement invalid point that far away from the cross-section in measurement and improved the accuracy of the cross-section data processing. On the other hand, the effective pedal point coordinates was used in the calculation of the plane location of cross-section point. The coordinate which can make the cross-section data more realistic and different from the translation of point and uniform distribution algorithm closeted to the effective point of measurement. The method that the elevation of pedal point on the cross section calculated using the distance weighted interpolation method has been applied in the measurement process of several rivers. It is proved in practice that the method got good results and achieved the accuracy of the data and quality which the application sector requirements on.

Cross-section for the photodisintegration of carbon into three α -particles

1953 ◽  
Vol 217 (1130) ◽  
pp. 357-375 ◽  
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Current Knowledge ◽  
Level Structure ◽  
Cross Section Data ◽  
Section Data ◽  
Main Work ◽  
Integrated Cross Section ◽  
The Cross ◽  
Α Particles

The cross-section for the photodisintegration 12 C( γ , 3 α ) has been determined for γ -ray energies up to about 60 MeV from a study of 2500 stars in nuclear emulsions. The methods used in selecting and identifying the stars are described, and full details are given of the corrections (for escape, observer efficiency, etc.) required for converting the experimental data into cross-section values. The cross-section exhibits at least five resonances, situated at γ -ray energies ( E y ) of 17.3, 18.3, 21.9, 24.3 and 29.4 MeV, and a strong minimum at E y ~20.5 MeV. This behaviour suggests that a well-defined compound nucleus is formed, the minimum near 20.5 MeV resulting from ( γ , n ) and ( γ , p ) competition. Furthermore, the finer details of the cross-section data are consistent with current knowledge of the 12 C level structure. The integrated cross-section is 1.21 ± 0.16 MeV mb for E y < 20.5 MeV, a further 2.8 ± 0.4 MeV mb for 20.5 ≤ E y < 42 MeV, and < 0.2 MeV mb for 42≤ E γ <60 MeV (where the symbol mb denotes 10 -27 cm 2 ). As a subsidiary result of the main work, the existence of the reaction 13 C( γ , n ) 3 α has been established.

Regge Pole Plus Background Model of Backward πp Scattering

1974 ◽  
Vol 52 (13) ◽  
pp. 1155-1159
Author(s):  
S. Kogitz ◽  
R. K. Logan
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Charge Exchange ◽  
Differential Cross ◽  
Regge Pole ◽  
Background Model ◽  
Cross Section Data ◽  
Section Data ◽  
The Cross ◽  
Exchange Scattering

We present a model of backward π+p, π−p, and π−p charge exchange scattering consistent with our earlier approach to forward π−p charge exchange and backward π+p. We consider two body differential cross section data which exhibits a dip–bump structure as well as nonzero polarization. This is explained in terms of a dominant Regge pole vanishing at the dip accompanied by a background. The background is primarily responsible for the large u behavior of the cross section which includes the rise after the dip. It is assumed that the presence of nonzero polarization dictates this behavior. We isolate the I = 3/2 amplitude in π−p backwards and determine the I = 1/2 amplitude from π+p backwards. A prediction for π−p → nπ0 follows.

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