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Running in normal mode (2-D tracking with least squares method), ANAETF takes about 4.1 s to analyze each 1 000 events in a laptop equipped with Intel(R) Core(TM) i7-8550U CPU @1.80 GHz and 8 GB RAM, corresponding to 14 min for analysis of a typical data file containing 200 000 events. Fig. 7 shows the PID spectrum of the reaction residues produced by 240 MeV/u 12C impinging on a carbon target, where the particle atomic number
$ Z $ is calculated via$ \Delta E\propto Z^2/\beta^2 $ , and$ aoz $ extracted following Eq. (1). The extracted cross sections for -n, -p, -2n and -np processes are compared with results from Ref. [20] for 12C incident at 250, 1 050 and 2 100 MeV/u in Table 1. Systematic errors from different labs considered, our results agree well with theirs.Figure 7. (color online) The PID spectrum of fragments from reaction of 240 MeV/u 12C impinging on a carbon target. The tail to the right of the unreacted 12C corresponds to particles skimming over the edge of TOF Wall strips, resulting in delayed timing (probability ~2%).
mb Residue 240 MeV/ua 250 MeV/ub 1 050 MeV/ub 2 100 MeV/ub 11C 60.51(11.08) 55.97(4.06) 44.70(2.80) 46.50(2.30) 10C 0.99(5.24) 5.33(0.81) 4.44(0.24) 4.11(0.22) 11B 62.37(5.67) 65.61(2.55) 48.60(2.40) 53.80(2.70) 10B 35.29(4.70) 47.50(2.42) 27.90(2.20) 35.10(3.40) a This work.
b Ref. [20].Table 1. Cross sections of 12C incident at different energies.
Data Analysis Framework for Radioactive Ion Beam Experiments at the External Target Facility of HIRFL-CSR
doi: 10.11804/NuclPhysRev.37.2019CNPC27
- Received Date: 2019-12-30
- Rev Recd Date: 2020-01-31
- Available Online: 2020-09-30
- Publish Date: 2020-09-20
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Key words:
- external target facility of HIRFL-CSR /
- data analysis framework /
- nuclear reaction /
- magnetic spectrometer /
- ANAETF
Abstract: ANAETF, a large data analysis framework for the External Target Facility (ETF) of HIRFL-CSR, has been developed and successfully used for data analysis in radioactive ion beam experiments. This paper covers the flow of data processing in the program, the general tracking algorithm for the drift chambers, the particle identification (PID) approach, and the techniques for extraction of reaction cross sections. The program achieves total detecting efficiencies of around ~90% and gives clear PID spectrum for carbon and beryllium fragments produced from the reaction of 240 MeV/u 12C secondary beams on a carbon target. The obtained cross sections are consistent with the previously reported experimental results.
Citation: | Yazhou SUN, Yixuan ZHAO, Shuya JIN, Shitao WANG, Zhiyu SUN, Xueheng ZHANG, Duo YAN, Shuwen TANG, Peng MA, Yuhong YU, Ke YUE, Limin DUAN, Herun YANG, Chengui LU, Fang FANG, Hong SU. Data Analysis Framework for Radioactive Ion Beam Experiments at the External Target Facility of HIRFL-CSR[J]. Nuclear Physics Review, 2020, 37(3): 742-748. doi: 10.11804/NuclPhysRev.37.2019CNPC27 |