A new scanning system for alpha decay events as calibration sources for range-energy relation in nuclear emulsion

Yoshida, Junya; Kinbara, Shinji; Mishina, Akihiro; Nakazawa, Kimitaka; Soe, Myint Kyaw; Theint, Aye Moh Moh; Tint, Khin Than

doi:10.1016/j.nima.2016.11.044

Cited by 24 publications

(16 citation statements)

References 23 publications

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“…Precise measurement for a special event is performed by a dedicated image processing for a series of micrographs [4]. The micrographs are taken under 100x objective lens with a resolution of about 0.143µm/pixel.…”

Section: Range and Angle Measurementmentioning

confidence: 99%

“…They can be identified easily because they have a characteristic topology: the longest track in "alphastar" having 5 alpha tracks. A modern scanning technique, "Overall scanning method" is used for the alpha decay search [4]. We collect about 100 tracks and measure their range with the image processing.…”

Section: Measurement Of Density and Shrinkage Factor Of An Emulsion Smentioning

confidence: 99%

“…The yield is 10 times more than the previous experiments. In addition, we will apply a new analysis method named Overall scanning method [4] to analyze the entire volume of the emulsion. Finally, we estimate that 1000 DH events will be detected in 5 years.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Operation Steps for Data Analysis on Double Hypernuclei in E07 Experiment

Nyaw

Ekawa

Hayakawa

et al. 2019

Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)

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We have developed a new analysis scheme for event identification of double hypernuclei to deal with the largest amount of events which are obtained through the J-PARC E07 experiment. We developed dedicated computer programs which perform range and angle measurement, range-energy translation, measurement of density and shrinkage factor of an emulsion sheet, and kinematic analysis instead of the conventional manual method. The processing time for the production or decay process identification for an event is less than five minutes on a typical PC. Based on this method, we performed the entire analysis process within four days including alpha scanning and processing for range-energy calibration. This method has been applied in the analysis of newly found events including MINO event and IBUKI event by the J-PARC E07.

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Section: Range and Angle Measurementmentioning

confidence: 99%

Section: Measurement Of Density and Shrinkage Factor Of An Emulsion Smentioning

confidence: 99%

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Operation Steps for Data Analysis on Double Hypernuclei in E07 Experiment

Nyaw

Ekawa

Hayakawa

et al. 2019

Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)

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“…An exhaustive search method as an alternative to the hybrid method is also being developed [13], and the first Ξ hypernucleus candidate was observed [14,15]. With this method called "overall scanning" herein, the entire volume of the irradiated emulsion is scanned, and therefore the method is capable of detecting events of a non-triggered double hypernuclear production.…”

Section: Introductionmentioning

confidence: 99%

“…For the overall scanning approach, we previously developed a scanning system called "Vertex Picker" [13]. This system takes exhaustive micro-graphs of thick emulsion sheets and detects vertex-like objects with three or more tracks originated from a single point.…”

Section: Introductionmentioning

confidence: 99%

CNN-based event classification for alpha-decay events in nuclear emulsion

Yoshida,

Ekawa,

Kasagi

et al. 2020

Preprint

Self Cite

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We developed an efficient classifier that sorts alpha-decay events from various vertex-like objects in nuclear emulsion using a convolutional neural network (CNN). Alpha-decay events in the emulsion are standard calibration sources for the relation between the track length and kinetic energy in each emulsion sheet.We trained the CNN using 15,885 images of vertex-like objects including 906 alpha-decay events and tested it using a dataset of 46,948 images including 255 alpha-decay events. By tuning the hyperparameters of the CNN, the trained models achieved an Average Precision Score of 0.740 ± 0.009 for the test dataset.For the model obtained, a discrimination threshold of the classification can be arbitrarily adjusted according to the balance between the precision and recall.The precision and recall of the classification using previous method without a CNN were 0.081 ± 0.006 and 0.788 ± 0.056, respectively, for the same dataset.By contrast, the developed classifier obtained a precision of 0.547 ± 0.025 when a similar recall value of 0.788 was set. The developed CNN method reduced the human load for further visual inspection after the classification by approximately

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Experimental Aspect of S = –2 Hypernuclei

Nakazawa

2022

Handbook of Nuclear Physics

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A new scanning system for alpha decay events as calibration sources for range-energy relation in nuclear emulsion

Cited by 24 publications

References 23 publications

Operation Steps for Data Analysis on Double Hypernuclei in E07 Experiment

Operation Steps for Data Analysis on Double Hypernuclei in E07 Experiment

CNN-based event classification for alpha-decay events in nuclear emulsion

Experimental Aspect of S = –2 Hypernuclei

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