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  1. Article: CNS active target (CAT) for missing mass spectroscopy with intense beams.

    Ota, S / Tokieda, H / Lee, C S / Watanabe, Y N

    Journal of radioanalytical and nuclear chemistry

    2015  Volume 305, Issue 3, Page(s) 907–911

    Abstract: A new gaseous active target based on a time projection chamber, named CAT, is introduced. The remarkable feature is a dual gain THGEM to decrease the effective gain for the beam particles while keeping a high enough effective gain for the recoil ... ...

    Abstract A new gaseous active target based on a time projection chamber, named CAT, is introduced. The remarkable feature is a dual gain THGEM to decrease the effective gain for the beam particles while keeping a high enough effective gain for the recoil particles. The measured effective gain of low gain region was a factor of one hundred smaller than that of high gain region. This technique provides a wide dynamic range in order to detect both the beam and recoil particles at the same time even with a very high intensity beam of more than 10
    Language English
    Publishing date 2015-05-08
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2017242-4
    ISSN 1588-2780 ; 0236-5731
    ISSN (online) 1588-2780
    ISSN 0236-5731
    DOI 10.1007/s10967-015-4130-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Online: A copula-based visualization technique for a neural network

    Kubo, Yusuke / Komori, Yuto / Okuyama, Toyonobu / Tokieda, Hiroshi

    2020  

    Abstract: Interpretability of machine learning is defined as the extent to which humans can comprehend the reason of a decision. However, a neural network is not considered interpretable due to the ambiguity in its decision-making process. Therefore, in this study, ...

    Abstract Interpretability of machine learning is defined as the extent to which humans can comprehend the reason of a decision. However, a neural network is not considered interpretable due to the ambiguity in its decision-making process. Therefore, in this study, we propose a new algorithm that reveals which feature values the trained neural network considers important and which paths are mainly traced in the process of decision-making. In the proposed algorithm, the score estimated by the correlation coefficients between the neural network layers that can be calculated by applying the concept of a pair copula was defined. We compared the estimated score with the feature importance values of Random Forest, which is sometimes regarded as a highly interpretable algorithm, in the experiment and confirmed that the results were consistent with each other. This algorithm suggests an approach for compressing a neural network and its parameter tuning because the algorithm identifies the paths that contribute to the classification or prediction results.

    Comment: 8 pages, 6 figures
    Keywords Computer Science - Machine Learning ; Statistics - Machine Learning
    Subject code 006
    Publishing date 2020-03-27
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Book ; Online: Model Bridging

    Kisamori, Keiichi / Yamazaki, Keisuke / Komori, Yuto / Tokieda, Hiroshi

    To Interpretable Simulation Model From Neural Network

    2019  

    Abstract: The interpretability of machine learning, particularly for deep neural networks, is strongly required when performing decision-making in a real-world application. There are several studies that show that interpretability is obtained by replacing a non- ... ...

    Abstract The interpretability of machine learning, particularly for deep neural networks, is strongly required when performing decision-making in a real-world application. There are several studies that show that interpretability is obtained by replacing a non-explainable neural network with an explainable simplified surrogate model. Meanwhile, another approach to understanding the target system is simulation modeled by human knowledge with interpretable simulation parameters. Recently developed simulation learning based on applications of kernel mean embedding is a method used to estimate simulation parameters as posterior distributions. However, there was no relation between the machine learning model and the simulation model. Furthermore, the computational cost of simulation learning is very expensive because of the complexity of the simulation model. To address these difficulties, we propose a "model bridging" framework to bridge machine learning models with simulation models by a series of kernel mean embeddings. The proposed framework enables us to obtain predictions and interpretable simulation parameters simultaneously without the computationally expensive calculations associated with simulations. In this study, we investigate a Bayesian neural network model with a few hidden layers serving as an un-explainable machine learning model. We apply the proposed framework to production simulation and simulation of fluid-dynamics, which are important in the manufacturing industry.
    Keywords Statistics - Machine Learning ; Computer Science - Machine Learning
    Subject code 006
    Publishing date 2019-06-22
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Excitation of the Isovector Spin Monopole Resonance via the Exothermic ^{90}Zr(^{12}N,^{12}C) Reaction at 175  MeV/u.

    Noji, S / Sakai, H / Aoi, N / Baba, H / Berg, G P A / Doornenbal, P / Dozono, M / Fukuda, N / Inabe, N / Kameda, D / Kawabata, T / Kawase, S / Kikuchi, Y / Kisamori, K / Kubo, T / Maeda, Y / Matsubara, H / Michimasa, S / Miki, K /
    Miya, H / Miyasako, H / Sakaguchi, S / Sasamoto, Y / Shimoura, S / Takaki, M / Takeda, H / Takeuchi, S / Tokieda, H / Ohnishi, T / Ota, S / Uesaka, T / Wang, H / Yako, K / Yanagisawa, Y / Yokota, N / Yoshida, K / Zegers, R G T

    Physical review letters

    2018  Volume 120, Issue 17, Page(s) 172501

    Abstract: The (^{12}N, ^{12}C) charge-exchange reaction at 175  MeV/u was developed as a novel probe for studying the isovector spin giant monopole resonance (IVSMR), whose properties are important for better understanding the bulk properties of nuclei and ... ...

    Abstract The (^{12}N, ^{12}C) charge-exchange reaction at 175  MeV/u was developed as a novel probe for studying the isovector spin giant monopole resonance (IVSMR), whose properties are important for better understanding the bulk properties of nuclei and asymmetric nuclear matter. This probe, now available through the production of ^{12}N as a secondary rare-isotope beam, is exothermic, is strongly absorbed at the surface of the target nucleus, and provides selectivity for spin-transfer excitations. All three properties enhance the excitation of the IVSMR compared to other, primarily light-ion, probes, which have been used to study the IVSMR thus far. The ^{90}Zr(^{12}N,^{12}C) reaction was measured and the excitation energy spectra up to about 70 MeV for both the spin-transfer and non-spin-transfer channels were deduced separately by tagging the decay by γ emission from the ^{12}C ejectile. Besides the well-known Gamow-Teller and isobaric analog transitions, a clear signature of the IVSMR was identified. By comparing with the results from light-ion reactions on the same target nucleus and theoretical predictions, the suitability of this new probe for studying the IVSMR was confirmed.
    Language English
    Publishing date 2018-04-27
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.120.172501
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: How Different is the Core of ^{25}F from ^{24}O_{g.s.} ?

    Tang, T L / Uesaka, T / Kawase, S / Beaumel, D / Dozono, M / Fujii, T / Fukuda, N / Fukunaga, T / Galindo-Uribarri, A / Hwang, S H / Inabe, N / Kameda, D / Kawahara, T / Kim, W / Kisamori, K / Kobayashi, M / Kubo, T / Kubota, Y / Kusaka, K /
    Lee, C S / Maeda, Y / Matsubara, H / Michimasa, S / Miya, H / Noro, T / Obertelli, A / Ogata, K / Ota, S / Padilla-Rodal, E / Sakaguchi, S / Sakai, H / Sasano, M / Shimoura, S / Stepanyan, S S / Suzuki, H / Takaki, M / Takeda, H / Tokieda, H / Wakasa, T / Wakui, T / Yako, K / Yanagisawa, Y / Yasuda, J / Yokoyama, R / Yoshida, K / Zenihiro, J

    Physical review letters

    2020  Volume 124, Issue 21, Page(s) 212502

    Abstract: The structure of a neutron-rich ^{25}F nucleus is investigated by a quasifree (p,2p) knockout reaction at 270A  MeV in inverse kinematics. The sum of spectroscopic factors of π0d_{5/2} orbital is found to be 1.0±0.3. However, the spectroscopic factor ... ...

    Abstract The structure of a neutron-rich ^{25}F nucleus is investigated by a quasifree (p,2p) knockout reaction at 270A  MeV in inverse kinematics. The sum of spectroscopic factors of π0d_{5/2} orbital is found to be 1.0±0.3. However, the spectroscopic factor with residual ^{24}O nucleus being in the ground state is found to be only 0.36±0.13, while those in the excited state is 0.65±0.25. The result shows that the ^{24}O core of ^{25}F nucleus significantly differs from a free ^{24}O nucleus, and the core consists of ∼35% ^{24}O_{g.s.}. and ∼65% excited ^{24}O. The result may infer that the addition of the 0d_{5/2} proton considerably changes neutron structure in ^{25}F from that in ^{24}O, which could be a possible mechanism responsible for the oxygen dripline anomaly.
    Language English
    Publishing date 2020-06-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.124.212502
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Mapping of a New Deformation Region around ^{62}Ti.

    Michimasa, S / Kobayashi, M / Kiyokawa, Y / Ota, S / Yokoyama, R / Nishimura, D / Ahn, D S / Baba, H / Berg, G P A / Dozono, M / Fukuda, N / Furuno, T / Ideguchi, E / Inabe, N / Kawabata, T / Kawase, S / Kisamori, K / Kobayashi, K / Kubo, T /
    Kubota, Y / Lee, C S / Matsushita, M / Miya, H / Mizukami, A / Nagakura, H / Oikawa, H / Sakai, H / Shimizu, Y / Stolz, A / Suzuki, H / Takaki, M / Takeda, H / Takeuchi, S / Tokieda, H / Uesaka, T / Yako, K / Yamaguchi, Y / Yanagisawa, Y / Yoshida, K / Shimoura, S

    Physical review letters

    2020  Volume 125, Issue 12, Page(s) 122501

    Abstract: We performed the first direct mass measurements of neutron-rich scandium, titanium, and vanadium isotopes around the neutron number 40 at the RIKEN RI Beam Factory using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{58-60} ... ...

    Abstract We performed the first direct mass measurements of neutron-rich scandium, titanium, and vanadium isotopes around the neutron number 40 at the RIKEN RI Beam Factory using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{58-60}Sc, ^{60-62}Ti, and ^{62-64}V were measured for the first time. The experimental results show that the two-neutron separation energies in the vicinity of ^{62}Ti increase compared to neighboring nuclei. This shows that the masses of Ti isotopes near N=40 are affected by the Jahn-Teller effect. Therefore, a development of Jahn-Teller stabilization appears below the Cr isotopes, and the systematics in Sc, Ti, and V isotopes suggest that ^{62}Ti is located close to the peak of the Jahn-Teller effect.
    Language English
    Publishing date 2020-10-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.125.122501
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Binding effect of polychlorinated compounds and environmental carcinogens on rice bran fiber

    Sera, N / Morita, K / Nagasoe, M / Tokieda, H / Kitaura, T / Tokiwa, H

    Journal of nutritional biochemistry. 2005 Jan., v. 16, no. 1

    2005  

    Abstract: To accelerate the fecal excretion of polycyclic biphenyl (PCB), polychlorinated dibenzofurans (PCDFs), polychlorinated-p-dioxines (PCDDs) and various mutagens and carcinogens, their binding effect on rice bran fiber (RBF) was investigated for nine ... ...

    Abstract To accelerate the fecal excretion of polycyclic biphenyl (PCB), polychlorinated dibenzofurans (PCDFs), polychlorinated-p-dioxines (PCDDs) and various mutagens and carcinogens, their binding effect on rice bran fiber (RBF) was investigated for nine heterocyclic amines, six nitroarenes, 4-nitroquinoline-N-oxide, benzo[a]pyrene, furylfuramide, two kinds of flavonoid compounds and formaldehyde and ascorbic acid. PCBs, PCDFs and PCDDs suspended in nonane were incubated with RBF (10 mg/ml) at 37 degrees C and after centrifugation, unbound chemicals in the supernatant were analyzed by high-performance liquid chromatography (HPLC) and gas chromatography (GC). The binding effects on RBF were enhanced more than other dietary fibers (DFs), which were tested including corn, wheat bran, spinach, Hijiki (a kind of seaweed), sweet potatoes and burdock fibers. It was found that the binding effects were related to lignin contents. Binding of 3-amino-1(or 1,4)-dimethyl-5H-pyrido[4,3-b]indole (Trp-p-1 and Trp-p-2), food-derived carcinogens and 1-nitropyrene (1-NP), suspended in methanol, to RBF occurred within 10 min of incubation at 37 degrees C at pH 5-7, and decreased below pH 4; binding of food-derived carcinogens was pH dependent. The binding effects to RBF and pulp lignin were obtained at ratio of over 90%, while corn fiber and cellulose were at ratios of 4-30%. Polycyclic aromatic compounds were related to the number of rings, showing high binding effects to chemical structures with triple rings. Binding of 1-NP and PCB to RBF was not influenced in any aerobic and anaerobic bacterial cultures. It was also found that RBF was capable of binding even conjugates containing mutagens such as glucuronides and sulfates, as well as metabolites in urine. It was suggested, therefore, that mutagens and carcinogens were available for the fecal excretion of residual chemicals and their metabolites, and also for the fecal excretion of PCBs, PCDFs and related compound residues in patients of Yusho disease, who suffered food poisoning due to rice oil contaminated with PCB in Japan.
    Keywords mutagenicity ; polychlorinated dibenzofurans ; polychlorinated biphenyls ; polychlorinated dibenzodioxins ; carcinogens ; environmental exposure ; herbicide residues ; pollutants ; binding capacity ; binding sites ; dietary fiber ; rice bran ; feces ; defecation ; bioassays ; bacteria ; lignin ; chemical interactions ; antimutagenic activity ; anticarcinogenic activity
    Language English
    Dates of publication 2005-01
    Size p. 50-58.
    Document type Article
    ZDB-ID 1014929-6
    ISSN 1873-4847 ; 0955-2863
    ISSN (online) 1873-4847
    ISSN 0955-2863
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: A new neutron detector with a high position resolution for the study of the (p, pn) reaction on rare isotopes

    Kubota Y. / Sasano M. / Uesaka T. / Dozono M. / Itoh M. / Kawase S. / Kobayashi M. / Lee C. S. / Matsubara H. / Miya H. / Ota S. / Sekiguchi K. / Taguchi T. / Tang T. L. / Tokieda H. / Wakui T.

    EPJ Web of Conferences, Vol 66, p

    2014  Volume 11022

    Abstract: We are developing a neutron detector with a position resolution better than 3 mm to study the single particle properties of nuclei by the knockout (p, pn) reaction at intermediate energies. We constructed a prototype detector consisting of scintillating ... ...

    Abstract We are developing a neutron detector with a position resolution better than 3 mm to study the single particle properties of nuclei by the knockout (p, pn) reaction at intermediate energies. We constructed a prototype detector consisting of scintillating fibers and multi-anode photomultiplier tubes (PMTs). A test experiment using 70-MeV proton and 68- and 50-MeV neutron was performed for characterizing its performance. In preliminary results, a position resolution of about 3 mm, is realized, as designed. The resulting separation-energy resolution would be 1 MeV, when using this system at a distance of 2 m from the target for measuring the (p, pn) reaction.
    Keywords Physics ; QC1-999 ; Science ; Q
    Language English
    Publishing date 2014-03-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Magic Nature of Neutrons in ^{54}Ca: First Mass Measurements of ^{55-57}Ca.

    Michimasa, S / Kobayashi, M / Kiyokawa, Y / Ota, S / Ahn, D S / Baba, H / Berg, G P A / Dozono, M / Fukuda, N / Furuno, T / Ideguchi, E / Inabe, N / Kawabata, T / Kawase, S / Kisamori, K / Kobayashi, K / Kubo, T / Kubota, Y / Lee, C S /
    Matsushita, M / Miya, H / Mizukami, A / Nagakura, H / Nishimura, D / Oikawa, H / Sakai, H / Shimizu, Y / Stolz, A / Suzuki, H / Takaki, M / Takeda, H / Takeuchi, S / Tokieda, H / Uesaka, T / Yako, K / Yamaguchi, Y / Yanagisawa, Y / Yokoyama, R / Yoshida, K / Shimoura, S

    Physical review letters

    2018  Volume 121, Issue 2, Page(s) 22506

    Abstract: We perform the first direct mass measurements of neutron-rich calcium isotopes beyond neutron number 34 at the RIKEN Radioactive Isotope Beam Factory by using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{55-57}Ca are ... ...

    Abstract We perform the first direct mass measurements of neutron-rich calcium isotopes beyond neutron number 34 at the RIKEN Radioactive Isotope Beam Factory by using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{55-57}Ca are determined for the first time to be -18650(160), -13510(250), and -7370(990)  keV, respectively. We examine the emergence of neutron magicity at N=34 based on the new atomic masses. The new masses provide experimental evidence for the appearance of a sizable energy gap between the neutron 2p_{1/2} and 1f_{5/2} orbitals in ^{54}Ca, comparable to the gap between the neutron 2p_{3/2} and 2p_{1/2} orbitals in ^{52}Ca. For the ^{56}Ca nucleus, an open-shell property in neutrons is suggested.
    Language English
    Publishing date 2018-07-13
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.121.022506
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Extraction of the Landau-Migdal Parameter from the Gamow-Teller Giant Resonance in ^{132}Sn.

    Yasuda, J / Sasano, M / Zegers, R G T / Baba, H / Bazin, D / Chao, W / Dozono, M / Fukuda, N / Inabe, N / Isobe, T / Jhang, G / Kameda, D / Kaneko, M / Kisamori, K / Kobayashi, M / Kobayashi, N / Kobayashi, T / Koyama, S / Kondo, Y /
    Krasznahorkay, A J / Kubo, T / Kubota, Y / Kurata-Nishimura, M / Lee, C S / Lee, J W / Matsuda, Y / Milman, E / Michimasa, S / Motobayashi, T / Muecher, D / Murakami, T / Nakamura, T / Nakatsuka, N / Ota, S / Otsu, H / Panin, V / Powell, W / Reichert, S / Sakaguchi, S / Sakai, H / Sako, M / Sato, H / Shimizu, Y / Shikata, M / Shimoura, S / Stuhl, L / Sumikama, T / Suzuki, H / Tangwancharoen, S / Takaki, M / Takeda, H / Tako, T / Togano, Y / Tokieda, H / Tsubota, J / Uesaka, T / Wakasa, T / Yako, K / Yoneda, K / Zenihiro, J

    Physical review letters

    2018  Volume 121, Issue 13, Page(s) 132501

    Abstract: The key parameter to discuss the possibility of the pion condensation in nuclear matter, i.e., the so-called Landau-Migdal parameter g^{'}, was extracted by measuring the double-differential cross sections for the (p,n) reaction at 216  MeV/u on a ... ...

    Abstract The key parameter to discuss the possibility of the pion condensation in nuclear matter, i.e., the so-called Landau-Migdal parameter g^{'}, was extracted by measuring the double-differential cross sections for the (p,n) reaction at 216  MeV/u on a neutron-rich doubly magic unstable nucleus, ^{132}Sn with the quality comparable to data taken with stable nuclei. The extracted strengths for Gamow-Teller (GT) transitions from ^{132}Sn leading to ^{132}Sb exhibit the GT giant resonance (GTR) at the excitation energy of 16.3±0.4(stat)±0.4(syst)  MeV with the width of Γ=4.7±0.8  MeV. The integrated GT strength up to E_{x}=25  MeV is S_{GT}^{-}=53±5(stat)_{-10}^{+11}(syst), corresponding to 56% of Ikeda's sum rule of 3(N-Z)=96. The present result accurately constrains the Landau-Migdal parameter as g^{'}=0.68±0.07, thanks to the high sensitivity of the GTR energy to g^{'}. In combination with previous studies on the GTR for ^{90}Zr and ^{208}Pb, the result of this work shows the constancy of this parameter in the nuclear chart region with (N-Z)/A=0.11 to 0.24 and A=90 to 208.
    Language English
    Publishing date 2018-05-17
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.121.132501
    Database MEDical Literature Analysis and Retrieval System OnLINE

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