Author: "Ahn, D." / Publication Type: Electronic Resources - Searchworks@Jio Institute Digital Library Search Results

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42 results on '"Ahn, D."'

1. Experimental study of ⁴n with ⁸He(p,2p) reaction

Author: Huang, S. W., Yang, H., Marqués, F. M., Achouri, N. L., Ahn, D. S., Aumann, T., Baba, H., Beaumel, D., Böhmer, M., Boretzky, K., Caamaño, M., Chen, S., Chiga, N., Cortés, M. L., Cortina, D., Doornenbal, P., Douma, C. A., Dufter, F., Feng, J., Fernández-Domínguez, B., Elekes, Z., Forsberg, U., Fujino, T., Fukuda, N., Gašparić, I., Ge, Z., Gernhäuser, R., Gheller, J. M., Gibelin, J., Gillibert, A., Godoy, B. M., Halász, Z., Harada, T., Harakeh, M. N., Hirayama, A., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Knösel, M. A., Kobayashi, T., Kondo, Y., Koseoglou, P., Kubota, Y., Kuti, I., Lehr, C., Li, P. J., Liu, Y., Maeda, Y., Masuoka, S., Matsumoto, M., Mayer, J., Miki, H., Miwa, M., Murray, I., Nakamura, T., Obertelli, A., Orr, N., Otsu, H., Panin, V., Park, S., Parlog, M., Paschalis, S., Potlog, M., Reichert, S., Revel, A., Rossi, D., Saito, A., Sasano, M., Sato, H., Scheit, H., Schindler, F., Shimada, T., Shimizu, Y., Shimoura, S., Stefan, I., Storck, S., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Takeuchi, S., Tanaka, J., Togano, Y., Tomai, T., Törnqvsit, H. T., Tscheuschner, J., Uesaka, T., Wagner, V., Wimmer, K., Yamada, H., Yang, B., Yang, L., Yasuda, Y., Yoneda, K., Zanetti, L., Zenihiro, J., Elidiano, T., Lenain, C., Huang, S. W., Yang, H., Marqués, F. M., Achouri, N. L., Ahn, D. S., Aumann, T., Baba, H., Beaumel, D., Böhmer, M., Boretzky, K., Caamaño, M., Chen, S., Chiga, N., Cortés, M. L., Cortina, D., Doornenbal, P., Douma, C. A., Dufter, F., Feng, J., Fernández-Domínguez, B., Elekes, Z., Forsberg, U., Fujino, T., Fukuda, N., Gašparić, I., Ge, Z., Gernhäuser, R., Gheller, J. M., Gibelin, J., Gillibert, A., Godoy, B. M., Halász, Z., Harada, T., Harakeh, M. N., Hirayama, A., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Knösel, M. A., Kobayashi, T., Kondo, Y., Koseoglou, P., Kubota, Y., Kuti, I., Lehr, C., Li, P. J., Liu, Y., Maeda, Y., Masuoka, S., Matsumoto, M., Mayer, J., Miki, H., Miwa, M., Murray, I., Nakamura, T., Obertelli, A., Orr, N., Otsu, H., Panin, V., Park, S., Parlog, M., Paschalis, S., Potlog, M., Reichert, S., Revel, A., Rossi, D., Saito, A., Sasano, M., Sato, H., Scheit, H., Schindler, F., Shimada, T., Shimizu, Y., Shimoura, S., Stefan, I., Storck, S., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Takeuchi, S., Tanaka, J., Togano, Y., Tomai, T., Törnqvsit, H. T., Tscheuschner, J., Uesaka, T., Wagner, V., Wimmer, K., Yamada, H., Yang, B., Yang, L., Yasuda, Y., Yoneda, K., Zanetti, L., Zenihiro, J., Elidiano, T., and Lenain, C.
Abstract: The tetraneutron has attracted the attention of nuclear physicists during the past decades, but there is still no unambiguous confirmation of its existence or non-existence. A new experiment based on ⁸He(p,2p)⁷H{t+⁴ n} reaction, with direct detection of the four neutrons, has been carried out at RIBF, which can hopefully help to draw a definite conclusion on the tetraneutron system.
Published: 2024

2. Two different phase-change origins with chemical- and structural-phase-changes in C doped (1.5 wt.%) In3Sb1Te2

Author: Lee, Y. M., Lee, S. Y., Kim, K., Sasaki, T., Ahn, D., Jung, Min-Cherl, Lee, Y. M., Lee, S. Y., Kim, K., Sasaki, T., Ahn, D., and Jung, Min-Cherl
Abstract: We fabricated C-doped (1.5 wt.%) In3Sb1Te2 (CIST) thin films with amorphous phase (a-CIST) using a sputter method. Two electrical-phase-changes at 250 and 275 °C were observed in the sheet resistance measurement. In order to understand the origin of these electrical-phase-changes, all samples were characterized by XRD, TEM, and HRXPS with synchrotron radiation. In a-CIST, only weak Sb-C bonding was observed. In the first electrical-phase-change at 250 °C, strong Sb-C bonding occurred without an accompanying structural/phase change (still amorphous). On the other hand, the second electrical-phase-change at 275 °C was due to the structural/phase change from amorphous to crystalline without a chemical state change.
Published: 2023

3. Assessment of air quality in North Korea from satellite observations

Author: Chong, H., Lee, S., Cho, Y., Kim, J., Koo, J.-H., Pyo Kim, Y., Kim, Y., Woo, J.-H., Hyun Ahn, D., Chong, H., Lee, S., Cho, Y., Kim, J., Koo, J.-H., Pyo Kim, Y., Kim, Y., Woo, J.-H., and Hyun Ahn, D.
Abstract: North Korea's air quality is poorly understood due to a lack of reliable data. Here, we analyzed urban- to national-scale air quality changes in North Korea using multi-year satellite observations. Pyongyang, Nampo, Pukchang, and Munchon were identified as pollution hotspots. On a national scale, we found that North Korea experienced 6.7, 17.8, and 20.6 times greater amounts of nitrogen dioxide (NO2), sulfur dioxide (SO2), and carbon monoxide (CO) per unit primary energy supply (PES) than South Korea from 2005 to 2018. Besides, North Korea had a 24.3 times larger aerosol optical depth (AOD) per PES than South Korea from 2011 to 2018. Severe CO and aerosol pollution is aligned with extensive biofuel combustion. High SO2 pollution corresponds with the strong coal dependence of the industry. The change rates of the national average columns for NO2, SO2, and CO were + 3.6, -4.4, and -0.4 % yr-1, respectively. The AOD change rate was -4.8 % yr-1. Overall decreasing trends, except for NO2, are likely due to a decline in coal-fired PES. Positive NO2 trends are consistent with increasing industrial activities. Each pollutant showed consistent patterns of linear trends, even after correcting the influence of transboundary pollution. Flue gas control and biofuel consumption reduction seem necessary to improve North Korea's air quality.
Published: 2023
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4. Silicon tracker array for RIB experiments at SAMURAI

Author: Stefanescu, A. I., Panin, V., Trache, L., Motobayashi, T., Otsu, H., Saastamoinen, A., Uesaka, T., Stuhl, L., Tanaka, J., Tudor, D., Stefanescu, I. C., Spiridon, A. E., Yoneda, K., Baba, H., Kurokawa, M., Togano, Y., Halasz, Z., Sasano, M., Ota, S., Kubota, Y., Ahn, D. S., Kobayashi, T., Elekes, Z., Fukuda, N., Takeda, H., Kim, D., Takada, E., Suzuki, H., Yoshida, K., Shimizu, Y., Liu, H. N., Sun, Y. L., Isobe, T., Gibelin, J., Li, P. J., Zenihiro, J., Marqués, F. M., Harakeh, M. N., Kiss, G. G., Kurihara, A., Yasuda, M., Nakamura, T., Park, S., Yang, Z., Harada, T., Nishimura, M., Sato, H., Hahn, I. S., Chae, K. Y., Elson, J. M., Sobotka, L. G., Bertulani, C. A., Stefanescu, A. I., Panin, V., Trache, L., Motobayashi, T., Otsu, H., Saastamoinen, A., Uesaka, T., Stuhl, L., Tanaka, J., Tudor, D., Stefanescu, I. C., Spiridon, A. E., Yoneda, K., Baba, H., Kurokawa, M., Togano, Y., Halasz, Z., Sasano, M., Ota, S., Kubota, Y., Ahn, D. S., Kobayashi, T., Elekes, Z., Fukuda, N., Takeda, H., Kim, D., Takada, E., Suzuki, H., Yoshida, K., Shimizu, Y., Liu, H. N., Sun, Y. L., Isobe, T., Gibelin, J., Li, P. J., Zenihiro, J., Marqués, F. M., Harakeh, M. N., Kiss, G. G., Kurihara, A., Yasuda, M., Nakamura, T., Park, S., Yang, Z., Harada, T., Nishimura, M., Sato, H., Hahn, I. S., Chae, K. Y., Elson, J. M., Sobotka, L. G., and Bertulani, C. A.
Abstract: This work describes a silicon tracker system developed for experiments with proton-rich radioactive ion beams at the SAMURAI superconducting spectrometer of RIBF at RIKEN. The system is designed for accurate angular reconstruction and atomic number identification of relativistic heavy ions and protons which are simultaneously produced in reactions motivated by studies of proton capture reactions of interest for nuclear astrophysics. The technical characteristics of the tracking array are described in detail as are its performance in two pilot experiments. The physics justification for such a system is also presented.
Published: 2023
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5. Klebsiella pneumoniae induces host metabolic stress that promotes tolerance to pulmonary infection

Author: Lung, TWF, Charytonowicz, D, Beaumont, KG, Shah, SS, Sridhar, SH, Gorrie, CL, Mu, A, Hofstaedter, CE, Varisco, D, McConville, TH, Drikic, M, Fowler, B, Urso, A, Shi, W, Fucich, D, Annavajhala, MK, Khan, IN, Oussenko, I, Francoeur, N, Smith, ML, Stockwell, BR, Lewis, IA, Hachani, A, Baskota, SU, Uhlemann, A-C, Ahn, D, Ernst, RK, Howden, BP, Sebra, R, Prince, A, Lung, TWF, Charytonowicz, D, Beaumont, KG, Shah, SS, Sridhar, SH, Gorrie, CL, Mu, A, Hofstaedter, CE, Varisco, D, McConville, TH, Drikic, M, Fowler, B, Urso, A, Shi, W, Fucich, D, Annavajhala, MK, Khan, IN, Oussenko, I, Francoeur, N, Smith, ML, Stockwell, BR, Lewis, IA, Hachani, A, Baskota, SU, Uhlemann, A-C, Ahn, D, Ernst, RK, Howden, BP, Sebra, R, and Prince, A
Abstract: K. pneumoniae sequence type 258 (Kp ST258) is a major cause of healthcare-associated pneumonia. However, it remains unclear how it causes protracted courses of infection in spite of its expression of immunostimulatory lipopolysaccharide, which should activate a brisk inflammatory response and bacterial clearance. We predicted that the metabolic stress induced by the bacteria in the host cells shapes an immune response that tolerates infection. We combined in situ metabolic imaging and transcriptional analyses to demonstrate that Kp ST258 activates host glutaminolysis and fatty acid oxidation. This response creates an oxidant-rich microenvironment conducive to the accumulation of anti-inflammatory myeloid cells. In this setting, metabolically active Kp ST258 elicits a disease-tolerant immune response. The bacteria, in turn, adapt to airway oxidants by upregulating the type VI secretion system, which is highly conserved across ST258 strains worldwide. Thus, much of the global success of Kp ST258 in hospital settings can be explained by the metabolic activity provoked in the host that promotes disease tolerance.
Published: 2022

6. Observation of a correlated free four-neutron system

Author: Duer, M., Aumann, T., Gernhaeuser, R., Panin, V., Paschalis, S., Rossi, D. M., Achouri, N. L., Ahn, D., Baba, H., Bertulani, C. A., Boehmer, M., Boretzky, K., Caesar, C., Chiga, N., Corsi, A., Cortina-Gil, D., Douma, C. A., Dufter, F., Elekes, Z., Feng, J., Fernandez-Dominguez, B., Forsberg, U., Fukuda, N., Gasparic, I., Ge, Z., Gheller, J. M., Gibelin, J., Gillibert, A., Hahn, K. I., Halasz, Z., Harakeh, M. N., Hirayama, A., Holl, M., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Kobayashi, T., Kondo, Y., Koerper, D., Koseoglou, P., Kubota, Y., Kuti, I., Li, P. J., Lehr, C., Lindberg, S., Liu, Y., Marques, F. M., Masuoka, S., Matsumoto, M., Mayer, J., Miki, K., Monteagudo, B., Nakamura, T., Nilsson, T., Obertelli, A., Orr, N. A., Otsu, H., Park, S. Y., Parlog, M., Potlog, P. M., Reichert, S., Revel, A., Saito, A. T., Sasano, M., Scheit, H., Schindler, F., Shimoura, S., Simon, H., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Tanaka, J., Togano, Y., Tomai, T., Toernqvist, H. T., Tscheuschner, J., Uesaka, T., Wagner, V., Yamada, H., Yang, B., Yang, L., Yang, Z. H., Yasuda, M., Yoneda, K., Zanetti, L., Zenihiro, J., Zhukov, M. V., Duer, M., Aumann, T., Gernhaeuser, R., Panin, V., Paschalis, S., Rossi, D. M., Achouri, N. L., Ahn, D., Baba, H., Bertulani, C. A., Boehmer, M., Boretzky, K., Caesar, C., Chiga, N., Corsi, A., Cortina-Gil, D., Douma, C. A., Dufter, F., Elekes, Z., Feng, J., Fernandez-Dominguez, B., Forsberg, U., Fukuda, N., Gasparic, I., Ge, Z., Gheller, J. M., Gibelin, J., Gillibert, A., Hahn, K. I., Halasz, Z., Harakeh, M. N., Hirayama, A., Holl, M., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Kobayashi, T., Kondo, Y., Koerper, D., Koseoglou, P., Kubota, Y., Kuti, I., Li, P. J., Lehr, C., Lindberg, S., Liu, Y., Marques, F. M., Masuoka, S., Matsumoto, M., Mayer, J., Miki, K., Monteagudo, B., Nakamura, T., Nilsson, T., Obertelli, A., Orr, N. A., Otsu, H., Park, S. Y., Parlog, M., Potlog, P. M., Reichert, S., Revel, A., Saito, A. T., Sasano, M., Scheit, H., Schindler, F., Shimoura, S., Simon, H., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Tanaka, J., Togano, Y., Tomai, T., Toernqvist, H. T., Tscheuschner, J., Uesaka, T., Wagner, V., Yamada, H., Yang, B., Yang, L., Yang, Z. H., Yasuda, M., Yoneda, K., Zanetti, L., Zenihiro, J., and Zhukov, M. V.
Abstract: A long-standing question in nuclear physics is whether chargeless nuclear systems can exist. To our knowledge, only neutron stars represent near-pure neutron systems, where neutrons are squeezed together by the gravitational force to very high densities. The experimental search for isolated multi-neutron systems has been an ongoing quest for several decades(1), with a particular focus on the four-neutron system called the tetraneutron, resulting in only a few indications of its existence so far(2-4), leaving the tetraneutron an elusive nuclear system for six decades. Here we report on the observation of a resonance-like structure near threshold in the four-neutron system that is consistent with a quasi-bound tetraneutron state existing for a very short time. The measured energy and width of this state provide a key benchmark for our understanding of the nuclear force. The use of an experimental approach based on a knockout reaction at large momentum transfer with a radioactive high-energy He-8 beam was key.
Published: 2022

7. The beta-decay of Kr-70 into Br-70: Restoration of the pseudo-SU(4) symmetry

Author: Vitez-Sveiczer, A., Algora, A., Morales, A., I, Rubio, B., Kiss, G. G., Sarriguren, P., Van Isacker, P., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V, Montaner-Piza, A., Orrigo, S. E. A., Horvath, A., Napoli, D., Lenzi, S., Boso, A., Phong, V. H., Wu, J., Soderstrom, P-A, Sumikama, T., Suzuki, H., Takeda, H., Ahn, D. S., Baba, H., Doornebal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Gelletly, W., Dombradi, Zs, Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I, Kurz, N., Shaffner, H., Petrovici, A., Vitez-Sveiczer, A., Algora, A., Morales, A., I, Rubio, B., Kiss, G. G., Sarriguren, P., Van Isacker, P., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V, Montaner-Piza, A., Orrigo, S. E. A., Horvath, A., Napoli, D., Lenzi, S., Boso, A., Phong, V. H., Wu, J., Soderstrom, P-A, Sumikama, T., Suzuki, H., Takeda, H., Ahn, D. S., Baba, H., Doornebal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Gelletly, W., Dombradi, Zs, Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I, Kurz, N., Shaffner, H., and Petrovici, A.
Abstract: The beta-decay of the even-even nucleus Kr-70 with Z=N+2, has been investigated at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center using the BigRIPS fragment separator, the ZeroDegree Spectrometer, the WAS3ABI implantation station and the EURICA HPGe cluster array. Fifteen gamma-rays associated with the beta-decay of( 70)Kr into Br-70 have been identified for the first time, defining ten populated states below E-exc=3300 keV. The half-life of Kr-70 was derived with increased precision and found to be t(1/2)=45.19 +/- 0.14 ms. The beta-delayed proton emission probability has also been determined as epsilon(p)=0.545(23)%. An increase in the beta-strength to the yrast 1(+) state in comparison with the heaviest Z=N+2 system studied so far (Ge-62 decay) is observed that may indicate increased np correlations in the T=0 channel. The beta-decay strength deduced from the results is interpreted in terms of the proton-neutron quasiparticle random-phase approximation (pnQRPA) and also with a schematic model that includes isoscalar and isovector pairing in addition to quadrupole deformation. The application of this last model indicates an approximate realization of pseudo-SU(4) symmetry in this system. (C) 2022 The Author(s). Published by Elsevier B.V.
Published: 2022

8. First application of mass measurement with the Rare-RI Ring reveals the solar r-process abundance trend at A=122 and A=123

Author: Li, H. F., Naimi, S., Sprouse, T. M., Mumpower, M. R., Abe, Y., Yamaguchi, Y., Nagae, D., Suzaki, F., Wakasugi, M., Arakawa, H., Dou, W. B., Hamakawa, D., Hosoi, S., Inada, Y., Kajiki, D., Kobayashi, T., Sakaue, M., Yokoda, Y., Yamaguchi, T., Kagesawa, R., Kamioka, D., Moriguchi, T., Mukai, M., Ozawa, A., Ota, S., Kitamura, N., Masuoka, S., Michimasa, S., Baba, H., Fukuda, N., Shimizu, Y., Suzuki, H., Takeda, H., Ahn, D. S., Wang, M., Fu, C. Y., Wang, Q., Suzuki, S., Ge, Z., Litvinov, Yu. A., Lorusso, G., Walker, P. M., Podolyak, Zs., Uesaka, T., Li, H. F., Naimi, S., Sprouse, T. M., Mumpower, M. R., Abe, Y., Yamaguchi, Y., Nagae, D., Suzaki, F., Wakasugi, M., Arakawa, H., Dou, W. B., Hamakawa, D., Hosoi, S., Inada, Y., Kajiki, D., Kobayashi, T., Sakaue, M., Yokoda, Y., Yamaguchi, T., Kagesawa, R., Kamioka, D., Moriguchi, T., Mukai, M., Ozawa, A., Ota, S., Kitamura, N., Masuoka, S., Michimasa, S., Baba, H., Fukuda, N., Shimizu, Y., Suzuki, H., Takeda, H., Ahn, D. S., Wang, M., Fu, C. Y., Wang, Q., Suzuki, S., Ge, Z., Litvinov, Yu. A., Lorusso, G., Walker, P. M., Podolyak, Zs., and Uesaka, T.
Abstract: The Rare-RI Ring (R3) is a recently commissioned cyclotron-like storage ring mass spectrometer dedicated to mass measurements of exotic nuclei far from stability at Radioactive Isotope Beam Factory (RIBF) in RIKEN. The first application of mass measurement using the R3 mass spectrometer at RIBF is reported. Rare isotopes produced at RIBF, $^{127}$Sn, $^{126}$In, $^{125}$Cd, $^{124}$Ag, $^{123}$Pd, were injected in R3. Masses of $^{126}$In, $^{125}$Cd, and $^{123}$Pd were measured whereby the mass uncertainty of $^{123}$Pd was improved. This is the first reported measurement with a new storage ring mass spectrometery technique realized at a heavy-ion cyclotron and employing individual injection of the pre-identified rare nuclei. The latter is essential for the future mass measurements of the rarest isotopes produced at RIBF. The impact of the new $^{123}$Pd result on the solar $r$-process abundances in a neutron star merger event is investigated by performing reaction network calculations of 20 trajectories with varying electron fraction $Y_e$. It is found that the neutron capture cross section on $^{123}$Pd increases by a factor of 2.2 and $\beta$-delayed neutron emission probability, $P_\mathrm{1n}$, of $^{123}$Rh increases by 14\%. The neutron capture cross section on $^{122}$Pd decreases by a factor of 2.6 leading to pileup of material at $A=122$, thus reproducing the trend of the solar $r$-process abundances. The trend of the two-neutron separation energies (S$_\mathrm{2n}$) was investigated for the Pd isotopic chain. The new mass measurement with improved uncertainty excludes large changes of the S$_\mathrm{2n}$ value at $N=77$. Such large increase of the S$_\mathrm{2n}$ values before $N=82$ was proposed as an alternative to the quenching of the $N=82$ shell gap to reproduce $r$-process abundances in the mass region of $A=112-124$.
Published: 2021

9. Experimental Study of (4)n by Directly Detecting the Decay Neutrons

Author: Huang, S. W., Yang, Z. H., Marques, F. M., Achouri, N. L., Ahn, D. S., Aumann, T., Baba, H., Beaumel, D., Bohmer, M., Boretzky, K., Caamano, M., Chen, S., Chiga, N., Cortes, M. L., Cortina, D., Doornenbal, P., Douma, C. A., Dufter, F., Feng, J., Fernandez-Dominguez, B., Elekes, Z., Forsberg, U., Fujino, T., Fukuda, N., Gasparic, I, Ge, Z., Gernhaeuser, R., Gheller, J. M., Gibelin, J., Gillibert, A., Halasz, Z., Harada, T., Harakeh, M. N., Hirayama, A., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Kiyotake, S., Kobayashi, T., Kondo, Y., Koseoglou, P., Kubota, Y., Kuti, I, Lehr, C., Lenain, C., Li, P. J., Liu, Y., Maeda, Y., Masuoka, S., Matsumoto, M., Matta, A., Mayer, J., Miki, H., Miwa, M., Monteagudo, B., Murray, I, Nakamura, T., Obertelli, A., Orr, N. A., Otsu, H., Panin, V, Park, S., Parlog, M., Paschalis, S., Potlog, M., Reichert, S., Revel, A., Rossi, D., Saito, A., Sasano, M., Sato, H., Scheit, H., Schindler, F., Shimada, T., Shimizu, Y., Shimoura, S., Simon, H., Stefan, I, Storck, S., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Takeuchi, S., Tanaka, J., Togano, Y., Tomai, T., Toernqvist, H. T., Tronchin, E., Tscheuschner, J., Uesaka, T., Wagner, V, Wimmer, K., Yamada, H., Yang, B., Yang, L., Yasuda, Y., Yoneda, K., Zanetti, L., Zenihiro, J., Huang, S. W., Yang, Z. H., Marques, F. M., Achouri, N. L., Ahn, D. S., Aumann, T., Baba, H., Beaumel, D., Bohmer, M., Boretzky, K., Caamano, M., Chen, S., Chiga, N., Cortes, M. L., Cortina, D., Doornenbal, P., Douma, C. A., Dufter, F., Feng, J., Fernandez-Dominguez, B., Elekes, Z., Forsberg, U., Fujino, T., Fukuda, N., Gasparic, I, Ge, Z., Gernhaeuser, R., Gheller, J. M., Gibelin, J., Gillibert, A., Halasz, Z., Harada, T., Harakeh, M. N., Hirayama, A., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Kiyotake, S., Kobayashi, T., Kondo, Y., Koseoglou, P., Kubota, Y., Kuti, I, Lehr, C., Lenain, C., Li, P. J., Liu, Y., Maeda, Y., Masuoka, S., Matsumoto, M., Matta, A., Mayer, J., Miki, H., Miwa, M., Monteagudo, B., Murray, I, Nakamura, T., Obertelli, A., Orr, N. A., Otsu, H., Panin, V, Park, S., Parlog, M., Paschalis, S., Potlog, M., Reichert, S., Revel, A., Rossi, D., Saito, A., Sasano, M., Sato, H., Scheit, H., Schindler, F., Shimada, T., Shimizu, Y., Shimoura, S., Simon, H., Stefan, I, Storck, S., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Takeuchi, S., Tanaka, J., Togano, Y., Tomai, T., Toernqvist, H. T., Tronchin, E., Tscheuschner, J., Uesaka, T., Wagner, V, Wimmer, K., Yamada, H., Yang, B., Yang, L., Yasuda, Y., Yoneda, K., Zanetti, L., and Zenihiro, J.
Abstract: The tetraneutron has attracted the attention of nuclear physicists during the past decades, but there is still no unambiguous confirmation of its existence or non-existence. A new experiment based on He-8(p, 2p)H-7{t+(4)n} reaction, with direct detection of the four neutrons, has been carried out at RIBF, which can hopefully help to draw a definite conclusion on the tetraneutron system.
Published: 2021

10. Nuclear structure of Te isotopes beyond neutron magic number N=82

Author: Moon, B., Jungclaus, A., Naidja, H., Gargano, A., Lozeva, R., Moon, C-B, Odahara, A., Simpson, G. S., Nishimura, S., Browne, F., Doornenbal, P., Gey, G., Keatings, J., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Soderstrom, P-A, Sumikama, T., Taprogge, J., Watanabe, H., Wu, J., Xu, Z. Y., Yagi, A., Ahn, D. S., Baba, H., Garrote, F. L. Bello, Boenig, S., Daido, R., Daugas, J. M., Didierjean, F., Drouet, F., Fang, Y., Fukuda, N., Gernhaeuser, R., Hong, B., Ideguchi, E., Ilieva, S., Inabe, N., Ishigaki, T., Isobe, T., Jung, H. S., Kameda, D., Kojouharov, I, Komatsubara, T., Kroell, T., Kubo, T., Kurz, N., Kwon, Y. K., Lee, C. S., Lee, P., Li, Z., Montaner-Piza, A., Morimoto, S., Moschner, K., Muecher, D., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I, Orlandi, R., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Tshoo, K., Vajta, Zs, Wendt, A., Yokoyama, R., Yoshinaga, K., Moon, B., Jungclaus, A., Naidja, H., Gargano, A., Lozeva, R., Moon, C-B, Odahara, A., Simpson, G. S., Nishimura, S., Browne, F., Doornenbal, P., Gey, G., Keatings, J., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Soderstrom, P-A, Sumikama, T., Taprogge, J., Watanabe, H., Wu, J., Xu, Z. Y., Yagi, A., Ahn, D. S., Baba, H., Garrote, F. L. Bello, Boenig, S., Daido, R., Daugas, J. M., Didierjean, F., Drouet, F., Fang, Y., Fukuda, N., Gernhaeuser, R., Hong, B., Ideguchi, E., Ilieva, S., Inabe, N., Ishigaki, T., Isobe, T., Jung, H. S., Kameda, D., Kojouharov, I, Komatsubara, T., Kroell, T., Kubo, T., Kurz, N., Kwon, Y. K., Lee, C. S., Lee, P., Li, Z., Montaner-Piza, A., Morimoto, S., Moschner, K., Muecher, D., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I, Orlandi, R., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Tshoo, K., Vajta, Zs, Wendt, A., Yokoyama, R., and Yoshinaga, K.
Abstract: Newly observed decay schemes of the nuclei Sb-137 and Sb-138 are reported. The neutron-rich Sb isotopes were produced by the in-flight fragmentation of a U-238 primary beam with an energy of 345 MeV/nucleon. Several new excited states of Te-137 with tentatively assigned spin-parities of (5/2(-)), (9/2(-)), and (7/2) have been established which play an important role in the evolution of neutron levels beyond N = 82. The study of the beta decay of Sb-138 led to a considerable extension of the level scheme of Te-138 including the identification of several nonyrast states. The structure of Te-137 and Te-138 is discussed on the basis of large-scale shell-model calculations performed using two different effective interactions.
Published: 2021

11. beta decay of the very neutron-deficient Ge-60 and Ge-62 nuclei

Author: Orrigo, S. E. A., Rubio, B., Gelletly, W., Aguilera, P., Algora, A., Morales, A., I, Agramunt, J., Ahn, D. S., Ascher, P., Blank, B., Borcea, C., Boso, A., Cakirli, R. B., Chiba, J., de Angelis, G., de France, G., Diel, F., Doornenbal, P., Fujita, Y., Fukuda, N., Ganioglu, E., Gerbaux, M., Giovinazzo, J., Go, S., Goigoux, T., Grevy, S., Guadilla, V, Inabe, N., Kiss, G. G., Kubo, T., Kubono, S., Kurtukian-Nieto, T., Lubos, D., Magron, C., Molina, F., Montaner-Piza, A., Napoli, D., Nishimura, D., Nishimura, S., Oikawa, H., Phong, V. H., Sakurai, H., Shimizu, Y., Sidong, C., Soderstrom, P-A, Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., Wu, J., Yagi, S., Orrigo, S. E. A., Rubio, B., Gelletly, W., Aguilera, P., Algora, A., Morales, A., I, Agramunt, J., Ahn, D. S., Ascher, P., Blank, B., Borcea, C., Boso, A., Cakirli, R. B., Chiba, J., de Angelis, G., de France, G., Diel, F., Doornenbal, P., Fujita, Y., Fukuda, N., Ganioglu, E., Gerbaux, M., Giovinazzo, J., Go, S., Goigoux, T., Grevy, S., Guadilla, V, Inabe, N., Kiss, G. G., Kubo, T., Kubono, S., Kurtukian-Nieto, T., Lubos, D., Magron, C., Molina, F., Montaner-Piza, A., Napoli, D., Nishimura, D., Nishimura, S., Oikawa, H., Phong, V. H., Sakurai, H., Shimizu, Y., Sidong, C., Soderstrom, P-A, Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., Wu, J., and Yagi, S.
Abstract: We report here the results of a study of the beta decay of the proton-rich Ge isotopes, Ge-60 and Ge-62, produced in an experiment at the RIKEN Nishina Center. We have improved our knowledge of the half-lives of Ge-62 [73.5(1) ms] and Ge-60 [25.0(3) ms] and its daughter nucleus, Ga-60 [69.4(2) ms]. We measured individual beta-delayed proton and gamma emissions and their related branching ratios. Decay schemes and absolute Fermi and Gamow-Teller transition strengths have been determined. The mass excesses of the nuclei under study have been deduced. A total beta-delayed proton-emission branching ratio of 67(3)% has been obtained for Ge-60. New information has been obtained on the energy levels populated in Ga-60 and on the 1/2(-) excited state in the beta p daughter Zn-59. We extracted a ground state-to-ground state feeding of 85.3(3)% for the decay of Ge-62. Eight new y lines have been added to the deexcitation of levels populated in the Ga-62 daughter.
Published: 2021

12. Nuclear structure of Te isotopes beyond neutron magic number N=82

Author: RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Institute for Basic Science (South Korea), National Research Foundation of Korea, Ministerio de Economía y Competitividad (España), Japan Society for the Promotion of Science, National Research, Development and Innovation Office (Hungary), Moon, B., Jungclaus, Andrea, Naïdja, H., Gargano, A., Lozeva, R., Moon, C.B., Odahara, A., Simpson, G. S., Nishimura, S., Browne, F., Doornenbal, P., Gey, G., Keatings, J., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Söderström, P. A., Sumikama, T., Taprogge, J., Watanabe, H., Wu, J., Xu, Z. Y., Yagi, A., Ahn, D. S., Baba, H., Bello Garrote, F. L., Bönig, S., Daido, R., Daugas, J.M., Didierjean, F., Drouet, F., Fang, Y., Fukuda, N., Gernhäuser, R., Hong, B., Ideguchi, E., Ilieva, S., Inabe, N., Ishigaki, T., Isobe, T., Jung, H. S., Kameda, D., Kojouharov, I., Komatsubara, T., Kröll, T., Kubo, T., Kurz, N., Kwon, Y. K., Lee, C. S., Lee, P., Li, Z., Montaner-Pizá, A., Morimoto, S., Moschner, K., Mücher, D., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I., Orlandi, R., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Tshoo, K., Vajta, Zs, Wendt, A., Yokoyama, R., Yoshinaga, K., RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Institute for Basic Science (South Korea), National Research Foundation of Korea, Ministerio de Economía y Competitividad (España), Japan Society for the Promotion of Science, National Research, Development and Innovation Office (Hungary), Moon, B., Jungclaus, Andrea, Naïdja, H., Gargano, A., Lozeva, R., Moon, C.B., Odahara, A., Simpson, G. S., Nishimura, S., Browne, F., Doornenbal, P., Gey, G., Keatings, J., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Söderström, P. A., Sumikama, T., Taprogge, J., Watanabe, H., Wu, J., Xu, Z. Y., Yagi, A., Ahn, D. S., Baba, H., Bello Garrote, F. L., Bönig, S., Daido, R., Daugas, J.M., Didierjean, F., Drouet, F., Fang, Y., Fukuda, N., Gernhäuser, R., Hong, B., Ideguchi, E., Ilieva, S., Inabe, N., Ishigaki, T., Isobe, T., Jung, H. S., Kameda, D., Kojouharov, I., Komatsubara, T., Kröll, T., Kubo, T., Kurz, N., Kwon, Y. K., Lee, C. S., Lee, P., Li, Z., Montaner-Pizá, A., Morimoto, S., Moschner, K., Mücher, D., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I., Orlandi, R., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Tshoo, K., Vajta, Zs, Wendt, A., Yokoyama, R., and Yoshinaga, K.
Abstract: Newly observed decay schemes of the nuclei Sb137 and Sb138 are reported. The neutron-rich Sb isotopes were produced by the in-flight fragmentation of a U238 primary beam with an energy of 345 MeV/nucleon. Several new excited states of Te137 with tentatively assigned spin-parities of (5/2-), (9/2-), and (7/2) have been established which play an important role in the evolution of neutron levels beyond N=82. The study of the ß decay of Sb138 led to a considerable extension of the level scheme of Te138 including the identification of several nonyrast states. The structure of Te137 and Te138 is discussed on the basis of large-scale shell-model calculations performed using two different effective interactions.
Published: 2021

13. Spectroscopy of Cd 99 and in 101 from β decays of in 99 and Sn101

Author: Park, J, Krücken, R, Blazhev, A, Lubos, D, Gernhäuser, R, Lewitowicz, M, Nishimura, S, Ahn, D S, Baba, H, Blank, B, Boutachkov, P, Browne, F, Čeliković, Igor T., de France, G., Doornenbal, P, Faestermann, T, Fang, Y, Fukuda, N, Giovinazzo, J, Goel, N, Górska, M, Grawe, H, Ilieva, S, Inabe, N, Isobe, T, Jungclaus, A, Kameda, D, Kim, G. D., Kim, Y.-K., Kojouharov, I, Kubo, T, Kurz, N, Kwon, Y K, Lorusso, G, Moschner, K, Murai, D, Nishizuka, I, Patel, Z, Rajabali, M M, Rice, S, Sakurai, H, Schaffner, H, Shimizu, Y, Sinclair, L, Söderström, P.-A., Steiger, K, Sumikama, T, Suzuki, H, Takeda, H, Wang, Z, Watanabe, H, Wu, J, Xu, Z Y, Park, J, Krücken, R, Blazhev, A, Lubos, D, Gernhäuser, R, Lewitowicz, M, Nishimura, S, Ahn, D S, Baba, H, Blank, B, Boutachkov, P, Browne, F, Čeliković, Igor T., de France, G., Doornenbal, P, Faestermann, T, Fang, Y, Fukuda, N, Giovinazzo, J, Goel, N, Górska, M, Grawe, H, Ilieva, S, Inabe, N, Isobe, T, Jungclaus, A, Kameda, D, Kim, G. D., Kim, Y.-K., Kojouharov, I, Kubo, T, Kurz, N, Kwon, Y K, Lorusso, G, Moschner, K, Murai, D, Nishizuka, I, Patel, Z, Rajabali, M M, Rice, S, Sakurai, H, Schaffner, H, Shimizu, Y, Sinclair, L, Söderström, P.-A., Steiger, K, Sumikama, T, Suzuki, H, Takeda, H, Wang, Z, Watanabe, H, Wu, J, and Xu, Z Y
Abstract: We report on new γ-ray spectroscopy results from β decays of In99 and Sn101. 30 new γ rays were observed following the β decay of In99, and inconsistencies in the literature with respect to the γ rays following the β decay of Sn101 were addressed with two confirmed cases and two new transitions. The experimental γ-ray energies, intensities, and coincidence relationships are discussed with shell model calculations, where theoretical β-decay branching ratios from the parent nuclei and γ-ray cascades of excited states from the daughter nuclei were combined to generate hypothetical βγ spectra and βγγ coincidence matrices. The most intense β-delayed γ-ray branches in both Cd99 and In101 were well reproduced with this approach, and several γ rays were assigned to new excited states based on their good agreement with shell model predictions.
Published: 2020

14. STUDYING THE EXOTIC DECAY Kr-70 -> Br-70

Author: Vitez-Sveiczer, A., Algora, A., Morales, A. I., Rubio, B., Kiss, G. G., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V., Montaner-Piza, A., Orrigo, S. E. A., Horvath, A., Napoli, D., Lenzi, S., Boso, A., Phong, V. H., Wu, J., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D. S., Baba, H., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Chen, S., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grevy, S., Kurtukian Nieto, T., Magron, C., Gelletly, W., Dombradi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Shaffner, H., Vitez-Sveiczer, A., Algora, A., Morales, A. I., Rubio, B., Kiss, G. G., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V., Montaner-Piza, A., Orrigo, S. E. A., Horvath, A., Napoli, D., Lenzi, S., Boso, A., Phong, V. H., Wu, J., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D. S., Baba, H., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Chen, S., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grevy, S., Kurtukian Nieto, T., Magron, C., Gelletly, W., Dombradi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., and Shaffner, H.
Abstract: Beta-decay of the very neutron-deficient Kr isotope, Kr-70, was studied at RIKEN-RIBF using the EURICA cluster array. The experiment significantly increased our knowledge of the beta-decay of this isotope. Namely, 16 new gamma-ray transitions were identified and the half-life was derived from time correlations of the beta particles (t(1/2)(i beta) = (44.99 +/- 0.16) ms) and from the decay curves of the observed gamma-ray transitions (t(1/2)(i beta gamma) = (45.16 +/- 0.71) ms), respectively.
Published: 2020

15. Fragmentation of Single-Particle Strength around the Doubly Magic Nucleus Sn-132 and the Position of the 0f (5/2) Proton-Hole State in In-131

Author: Vaquero, V., Jungclaus, A., Aumann, T., Tscheuschner, J., Litvinova, E. V., Tostevin, J. A., Baba, H., Ahn, D. S., Avigo, R., Boretzky, K., Bracco, A., Caesar, C., Camera, F., Chen, S., Derya, V., Doornenbal, P., Endres, J., Fukuda, N., Garg, U., Giaz, A., Harakeh, M. N., Heil, M., Horvat, A., Ieki, K., Imai, N., Inabe, N., Kalantar-Nayestanaki, N., Kobayashi, N., Kondo, Y., Koyama, S., Kubo, T., Martel, I., Matsushita, M., Million, B., Motobayashi, T., Nakamura, T., Nakatsuka, N., Nishimura, M., Nishimura, S., Ota, S., Otsu, H., Ozaki, T., Petri, M., Reifarth, R., Rodriguez-Sanchez, J. L., Rossi, D., Saito, A. T., Sakurai, H., Savran, D., Scheit, H., Schindler, F., Schrock, P., Semmler, D., Shiga, Y., Shikata, M., Shimizu, Y., Simon, H., Steppenbeck, D., Suzuki, H., Sumikama, T., Symochko, D., Syndikus, I., Takeda, H., Takeuchi, S., Taniuchi, R., Togano, Y., Tsubota, J., Wang, H., Wieland, O., Yoneda, K., Zenihiro, J., Zilges, A., Vaquero, V., Jungclaus, A., Aumann, T., Tscheuschner, J., Litvinova, E. V., Tostevin, J. A., Baba, H., Ahn, D. S., Avigo, R., Boretzky, K., Bracco, A., Caesar, C., Camera, F., Chen, S., Derya, V., Doornenbal, P., Endres, J., Fukuda, N., Garg, U., Giaz, A., Harakeh, M. N., Heil, M., Horvat, A., Ieki, K., Imai, N., Inabe, N., Kalantar-Nayestanaki, N., Kobayashi, N., Kondo, Y., Koyama, S., Kubo, T., Martel, I., Matsushita, M., Million, B., Motobayashi, T., Nakamura, T., Nakatsuka, N., Nishimura, M., Nishimura, S., Ota, S., Otsu, H., Ozaki, T., Petri, M., Reifarth, R., Rodriguez-Sanchez, J. L., Rossi, D., Saito, A. T., Sakurai, H., Savran, D., Scheit, H., Schindler, F., Schrock, P., Semmler, D., Shiga, Y., Shikata, M., Shimizu, Y., Simon, H., Steppenbeck, D., Suzuki, H., Sumikama, T., Symochko, D., Syndikus, I., Takeda, H., Takeuchi, S., Taniuchi, R., Togano, Y., Tsubota, J., Wang, H., Wieland, O., Yoneda, K., Zenihiro, J., and Zilges, A.
Abstract: Spectroscopic factors of neutron-hole and proton-hole states in Sn-131 and In-131, respectively, were measured using one-nucleon removal reactions from doubly magic Sn-132 at relativistic energies. For In-131, a 2910(50)-keV gamma ray was observed for the first time and tentatively assigned to a decay from a 5/2(-) state at 3275(50) keV to the known 1/2(-) level at 365 keV. The spectroscopic factors determined for this new excited state and three other single-hole states provide first evidence for a strong fragmentation of single-hole strength in Sn-131 and In-131. The experimental results are compared to theoretical calculations based on the relativistic particle-vibration coupling model and to experimental information for single-hole states in the stable doubly magic nucleus Pb-208.
Published: 2020

16. TWO-PROTON RADIOACTIVITY: THE INTERESTING CASE OF Kr-67 AND FURTHER STUDIES

Author: Giovinazzo, J., Goigoux, T., Blank, B., Ascher, P., Gerbaux, M., Grevy, S., Kurtukian-Nieto, T., Magron, C., Doornenbal, P., Fukuda, N., Inabe, N., Kiss, G. G., Kubo, T., Kubono, S., Nishimura, S., Sakurai, H., Shimizu, Y., Sidong, C., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Vi, P., Wu, J., Ahn, D. S., Agramunt, J., Algora, A., Guadilla, V., Montaner-Piza, A., Morales, A. I., Orrigo, S. E. A., Rubio, B., Fujita, Y., Tanaka, M., Gelletly, W., Aguilera, P., Molina, F., Diel, F., Lubos, D., de Angelis, G., Napoli, D., Borcea, C., Boso, A., Cakirli, R. B., Ganioglu, E., Chiba, J., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Wimmer, K., de France, G., Go, S., Brown, B. A., Giovinazzo, J., Goigoux, T., Blank, B., Ascher, P., Gerbaux, M., Grevy, S., Kurtukian-Nieto, T., Magron, C., Doornenbal, P., Fukuda, N., Inabe, N., Kiss, G. G., Kubo, T., Kubono, S., Nishimura, S., Sakurai, H., Shimizu, Y., Sidong, C., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Vi, P., Wu, J., Ahn, D. S., Agramunt, J., Algora, A., Guadilla, V., Montaner-Piza, A., Morales, A. I., Orrigo, S. E. A., Rubio, B., Fujita, Y., Tanaka, M., Gelletly, W., Aguilera, P., Molina, F., Diel, F., Lubos, D., de Angelis, G., Napoli, D., Borcea, C., Boso, A., Cakirli, R. B., Ganioglu, E., Chiba, J., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Wimmer, K., de France, G., Go, S., and Brown, B. A.
Abstract: We report on the observation of Kr-67 that has been produced in an experiment performed at the RIKEN/BigRIPS facility. The two-proton decay of Kr-67 has been evidenced and this nucleus is thus the fourth observed long lived ground-state two-proton emitter, after Fe-45, Ni-48 and Zn-54. In addition, the decay of several isotopes in the mass region has been investigated. While for previous cases of two-proton radioactivity, the theoretical models could reproduce the measured data, this is not the case anymore for Kr-67. Two interpretations have been proposed to explain this discrepancy: a transition between real two-proton and sequential decay or the influence of deformation. These hypotheses will be tested in future experiments by measuring the angular and energy correlations of the emitted protons.
Published: 2020

17. Spectroscopy of Cd-99 and In-101 from beta decays of In-99 and Sn-101

Author: Park, J., Kruecken, R., Blazhev, A., Lubos, D., Gernhaeuser, R., Lewitowicz, M., Nishimura, S., Ahn, D. S., Baba, H., Blank, B., Boutachkov, P., Browne, F., Celikovic, I, de France, G., Doornenbal, P., Faestermann, T., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Gorska, M., Grawe, H., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y-K, Kojouharov, I, Kubo, T., Kurz, N., Kwon, Y. K., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I, Patel, Z., Rajabali, M. M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L., Soderstrom, P-A, Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Watanabe, H., Wu, J., Xu, Z. Y., Park, J., Kruecken, R., Blazhev, A., Lubos, D., Gernhaeuser, R., Lewitowicz, M., Nishimura, S., Ahn, D. S., Baba, H., Blank, B., Boutachkov, P., Browne, F., Celikovic, I, de France, G., Doornenbal, P., Faestermann, T., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Gorska, M., Grawe, H., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y-K, Kojouharov, I, Kubo, T., Kurz, N., Kwon, Y. K., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I, Patel, Z., Rajabali, M. M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L., Soderstrom, P-A, Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Watanabe, H., Wu, J., and Xu, Z. Y.
Abstract: We report on new gamma-ray spectroscopy results from beta decays of In-99 and Sn-101. 30 new gamma rays were observed following the beta decay of In-99, and inconsistencies in the literature with respect to the gamma rays following the beta decay of Sn-101 were addressed with two confirmed cases and two new transitions. The experimental gamma-ray energies, intensities, and coincidence relationships are discussed with shell model calculations, where theoretical beta-decay branching ratios from the parent nuclei and gamma-ray cascades of excited states from the daughter nuclei were combined to generate hypothetical beta gamma spectra and beta gamma gamma coincidence matrices. The most intense beta-delayed gamma-ray branches in both Cd-99 and In-101 were well reproduced with this approach, and several gamma rays were assigned to new excited states based on their good agreement with shell model predictions.
Published: 2020

18. Investigation of the structural interaction between the wing and body of a class of simple remotely piloted aircraft

Author: Ahn, D. M. and Griffin, K. H.
Subjects: 629.1323
Abstract: Effects of various wing-body interaction design parameter variations on the structural behaviour of a small RPV have been investigated using the finite element method on an adhoc basis rather than a classical analytic approach. The method in use is based on the substructuring displacement method considering the body and the wing as two major substructures. The elastic coupling effect of wing stiffness on the body structural behaviour also examined. By comparing classical analysis methods to the present. investigation, comments are made upon the use of those methods in the design analysis of the RPV class of structure. From the calculated results, general guidelines on the structural wing-body interaction analysis or design of this class of vehicle have been proposed. A set of finite element programs have been developed for the present investigation, and relevant finite elements based on the displacement assumption have been formulated.
Published: 1982

19. Toward the limit of nuclear binding on the N = Z line : Spectroscopy of Cd-96

Author: Davies, P. J., Park, J., Grawe, H., Wadsworth, R., Gernhauser, R., Krucken, R., Nowacki, F., Ahn, D. S., Ameil, F., Baba, H., Bäck, T., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Celikovic, I, Dewald, M., Doornenbal, P., Faestermann, T., Fang, Y., de France, G., Fukuda, N., Gengelbach, Aila, Gerl, J., Giovinazzo, J., Go, S., Goel, N., Gorska, M., Gregor, E., Hotaka, H., Ilieva, S., Inabe, N., Isobe, T., Jenkins, D. G., Jolie, J., Jung, H. S., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y-K, Kojouharov, I, Kubo, T., Kurz, N., Lewitowicz, M., Lorusso, G., Lubos, D., Maier, L., Merchan, E., Moschner, K., Murai, D., Naqvi, F., Nishibata, H., Nishimura, D., Nishimura, S., Nishizuka, I, Patel, Z., Pietralla, N., Rajabali, M. M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L. F., Soederstroem, P-A, Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Taprogge, J., Thöle, P., Valder, S., Wang, Z., Warr, N., Watanabe, H., Werner, V, Wu, J., Xu, Z. Y., Yagi, A., Yoshinaga, K., Zhu, Y., Davies, P. J., Park, J., Grawe, H., Wadsworth, R., Gernhauser, R., Krucken, R., Nowacki, F., Ahn, D. S., Ameil, F., Baba, H., Bäck, T., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Celikovic, I, Dewald, M., Doornenbal, P., Faestermann, T., Fang, Y., de France, G., Fukuda, N., Gengelbach, Aila, Gerl, J., Giovinazzo, J., Go, S., Goel, N., Gorska, M., Gregor, E., Hotaka, H., Ilieva, S., Inabe, N., Isobe, T., Jenkins, D. G., Jolie, J., Jung, H. S., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y-K, Kojouharov, I, Kubo, T., Kurz, N., Lewitowicz, M., Lorusso, G., Lubos, D., Maier, L., Merchan, E., Moschner, K., Murai, D., Naqvi, F., Nishibata, H., Nishimura, D., Nishimura, S., Nishizuka, I, Patel, Z., Pietralla, N., Rajabali, M. M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L. F., Soederstroem, P-A, Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Taprogge, J., Thöle, P., Valder, S., Wang, Z., Warr, N., Watanabe, H., Werner, V, Wu, J., Xu, Z. Y., Yagi, A., Yoshinaga, K., and Zhu, Y.
Abstract: A gamma -decaying isomeric state (tau(1/2) = 197(-17)(+19) ns) has been identified in Cd-96, which is one alpha particle away from the last known bound N = Z nucleus, Sn-100. Comparison of the results with shell-model calculations has allowed a tentative experimental level scheme to be deduced and the isomer to be interpreted as a medium-spin negative-parity spin trap based on the coupling of isoscalar (T = 0) and isovector (T = 1) neutron-proton pairs. The data also suggest evidence for the population of a 9(+) T = 1 state, which is predicted by shell-model calculations to be yrast. Such a low-lying T = 1 state, which is unknown in lighter mass even-even self-conjugate nuclei, can also be interpreted in terms of the coupling of T = 0 and T = 1 neutron-proton pairs.
Published: 2019
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20. Improved Value for the Gamow-Teller Strength of the Sn-100 Beta Decay

Author: Lubos, D., Park, J., Faestermann, T., Gernhaeuser, R., Kruecken, R., Lewitowicz, M., Nishimura, S., Sakurai, H., Ahn, D. S., Baba, H., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Celikovic, I., de France, G., Doornenbal, P., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Gorska, M., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, Y. K., Kojouharov, I., Kubo, T., Kurz, N., Kwon, Y. K., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I., Patel, Z., Rajabali, M. M., Rice, S., Schaffner, H., Shimizu, Y., Sinclair, L., Soderstrom, P. -A., Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Warr, N., Watanabe, H., Wu, J., Xu, Z., Lubos, D., Park, J., Faestermann, T., Gernhaeuser, R., Kruecken, R., Lewitowicz, M., Nishimura, S., Sakurai, H., Ahn, D. S., Baba, H., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Celikovic, I., de France, G., Doornenbal, P., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Gorska, M., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, Y. K., Kojouharov, I., Kubo, T., Kurz, N., Kwon, Y. K., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I., Patel, Z., Rajabali, M. M., Rice, S., Schaffner, H., Shimizu, Y., Sinclair, L., Soderstrom, P. -A., Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Warr, N., Watanabe, H., Wu, J., and Xu, Z.
Abstract: A record number of Sn-100 nuclei was detected and new isotopic species toward the proton dripline were discovered at the RIKEN Nishina Center. Decay spectroscopy was performed with the high-efficiency detector arrays WAS3ABi and EURICA. Both the half-life and the beta-decay end point energy of Sn-100 were measured more precisely than the literature values. The value and the uncertainty of the resulting strength for the pure 0(+) -> 1(+) Gamow-Teller decay was improved to B-GT = 4.4(-0.7)(+0.9). A discrimination between different model calculations was possible for the first time, and the level scheme of In-100 is investigated 6 further.
Published: 2019

21. New and comprehensive beta- and beta p-decay spectroscopy results in the vicinity of Sn-100

Author: Park, J., Krucken, R., Lubos, D., Gernhaeuser, R., Lewitowicz, M., Nishimura, S., Ahn, D. S., Baba, H., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Celikovic, I, de France, G., Doornenbal, P., Faestermann, T., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Gorska, M., Grawe, H., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y-K, Kojouharov, I, Kubo, T., Kurz, N., Kwon, Y. K., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I, Pate, Z., Rajabali, M. M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L., Soderstrom, P-A, Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Watanabe, H., Wu, J., Xu, Z. Y., Park, J., Krucken, R., Lubos, D., Gernhaeuser, R., Lewitowicz, M., Nishimura, S., Ahn, D. S., Baba, H., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Celikovic, I, de France, G., Doornenbal, P., Faestermann, T., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Gorska, M., Grawe, H., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y-K, Kojouharov, I, Kubo, T., Kurz, N., Kwon, Y. K., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I, Pate, Z., Rajabali, M. M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L., Soderstrom, P-A, Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Watanabe, H., Wu, J., and Xu, Z. Y.
Abstract: A decay spectroscopy experiment on proton-rich nuclei in the vicinity of the doubly magic Sn-100 was carried out at RIKEN Nishina Center. More than 20 nuclei with 43 <= Z <= 50 and N <= 51, produced by fragmentation reactions were investigated via analyses of beta-decay, beta p-decay, and subsequent gamma-ray data. Owing to higher statistics, the precision on the half-lives of many of the ground states and isomers was improved. beta-decay endpoint energies of 11 states in 8 nuclei were measured for the first time, and the corresponding Q(EC) and excitation energies were generally consistent with various mass models. Many beta-delayed proton emission branching ratios were measured either for the first time or with higher precision compared to literature values, and some of them differed by more than 2 sigma. Many of the large discrepancies were associated with nuclei with long-lived isomeric states, highlighting large systematic uncertainties involved in these measurements. Twenty-five new gamma rays were observed, and ten new states are proposed with unambiguous excitation energies, spins, and parities. Most of the energies of the excited states were consistent within 300 keV or 20%, whichever was greater, compared to shell model predictions in the proton/neutron (P-1/2, g(9/2)) model space assuming a Sr-76 core. A signature of a new (1/2(-)) isomer in Cd-97 with T-1/2 = 0.73(7) s was found, in good agreement with shell model predictions.
Published: 2019

22. Kr-67 TWO-PROTON RADIOACTIVITY: RESULTS AND THEORETICAL INTERPRETATIONS

Author: Goigoux, T., Ascher, P., Blank, B., Gerbaux, M., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Ahn, D. S., Doornenbal, P., Fukuda, N., Inabe, N., Kiss, G., Kubo, T., Kubono, S., Nishimura, S., Sakurai, H., Shimizu, Y., Sidong, C., Soderstrom, P-A, Sumikama, T., Suzuki, H., Takeda, H., Vi, P., Wu, J., Fujita, Y., Tanaka, M., Agramunt, J., Algora, A., Guadilla, V, Montaner-Piza, A., Morales, A., I, Orrigo, S. E. A., Rubio, B., Gelletly, W., Aguilera, P., Molina, F., Diel, F., Lubos, D., de Angelis, G., Napoli, D., Borcea, C., Boso, A., Cakirli, R. B., Ganioglu, E., Chiba, J., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Wimmer, K., De France, G., Go, S., Brown, B. A., Goigoux, T., Ascher, P., Blank, B., Gerbaux, M., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Ahn, D. S., Doornenbal, P., Fukuda, N., Inabe, N., Kiss, G., Kubo, T., Kubono, S., Nishimura, S., Sakurai, H., Shimizu, Y., Sidong, C., Soderstrom, P-A, Sumikama, T., Suzuki, H., Takeda, H., Vi, P., Wu, J., Fujita, Y., Tanaka, M., Agramunt, J., Algora, A., Guadilla, V, Montaner-Piza, A., Morales, A., I, Orrigo, S. E. A., Rubio, B., Gelletly, W., Aguilera, P., Molina, F., Diel, F., Lubos, D., de Angelis, G., Napoli, D., Borcea, C., Boso, A., Cakirli, R. B., Ganioglu, E., Chiba, J., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Wimmer, K., De France, G., Go, S., and Brown, B. A.
Abstract: The two-proton radioactivity is a unique tool to study the nuclear structure beyond the proton drip-line. Since its discovery in 2002, the known emitters have been Mg-19, Fe-45, Ni-48, Zn-54 and Kr-67. Kr-67 was observed for the first time at the RIKEN Nishina Center in 2015. Its decay energy was measured at 1690(17) keV with a branching ratio of 37(14) %. The halflife, 7.4(30) ms, was found in contradiction with theoretical calculations, pointing out effects of decay dynamics and nuclear deformation.
Published: 2019

23. High-intensity interval training for patients with cardiovascular disease-is it safe? A systematic review

Author: Wewege, MA, Ahn, D, Yu, J, Liou, K, Keech, A, Wewege, MA, Ahn, D, Yu, J, Liou, K, and Keech, A
Abstract: Background-Cardiac rehabilitation (CR) for patients with cardiovascular disease has traditionally involved low-to moderateintensity continuous aerobic exercise training (MICT). There is growing and robust evidence that high-intensity interval training (HIIT) shows similar or greater efficacy compared with MICT across a range of cardiovascular and metabolic measures, in both healthy populations and populations with a chronic illness. However, there is understandable concern about the safety aspects of applying HIIT in CR settings. This systematic review analyzed safety data drawn from recent proof-of-concept studies of HIIT during CR among patients with cardiovascular disease. Methods and Results-We included trials comparing HIIT with either MICT or usual care in patients with coronary artery disease or heart failure participating in tertiary care services, such as phase 2 (outpatient) CR. Adverse events occurring during or up to 4 hours after an exercise training session were collated. There were 23 studies included, which analyzed 1117 participants (HIIT=547; MICT=570). One major cardiovascular adverse event occurred in relation to an HIIT session, equating to 1 major cardiovascular event per 17 083 training sessions (11 333 training hours). One minor cardiovascular adverse events and 3 noncardiovascular adverse events (primarily musculoskeletal complaints) were also reported for HIIT. Two noncardiovascular events were reported in relation to MICT. Conclusions-HIIT has shown a relatively low rate of major adverse cardiovascular events for patients with coronary artery disease or heart failure when applied within CR settings.
Published: 2018

24. beta decays of the heaviest N = Z - l nuclei and proton instability of In-97

Author: Park, J., Krucken, R., Lubos, D., Gernhaeuser, R., Lewitowicz, M., Nishimura, S., Ahn, D. S., Baba, H., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Celikovic, I., de France, G., Doornenbal, P., Faestermann, T., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Gorska, M., Grawe, H., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y. -K., Kojouharov, I., Kubo, T., Kurz, N., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I., Patel, Z., Rajabali, M. M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L., Soderstrom, P. -A., Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Watanabe, H., Wu, J., Xu, Z. Y., Park, J., Krucken, R., Lubos, D., Gernhaeuser, R., Lewitowicz, M., Nishimura, S., Ahn, D. S., Baba, H., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Celikovic, I., de France, G., Doornenbal, P., Faestermann, T., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Gorska, M., Grawe, H., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y. -K., Kojouharov, I., Kubo, T., Kurz, N., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I., Patel, Z., Rajabali, M. M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L., Soderstrom, P. -A., Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Watanabe, H., Wu, J., and Xu, Z. Y.
Abstract: We report on new or more precise half-lives, beta-decay endpoint energies, and beta-delayed proton emission branching ratios of(91) Pd, Cd-95,In-97, and Sn-99. The measured values are consistent with known mirror transitions in lighter T-z = -1/2 nuclei, shell-model calculations, and various mass models. In addition to the beta -decaying (9/2(+)) ground state, circumstantial evidence for a short-lived, proton-emitting isomer with spin (1 /2(-)) was found in(97)In. Based on the experimental data, a semiempirical theory on proton emission, and shell-model calculations, the proton separation energy of the In-97 ground state was determined to be -0.10 +/- 0.19 MeV. The existence of the short-lived, proton-unstable (1 /2(-)) isomer in In-97 establishes Cd-9S as an rp-process waiting point.
Published: 2018

25. Simultaneous investigation of the T=1(J(pi)=0(+)) and T=0(J(pi)=9(+)) beta decays in Br-70

Author: Morales, A. I., Algora, A., Rubio, B., Kaneko, K., Nishimura, S., Aguilera, P., Orrigo, S. E. A., Molina, F., de Angelis, G., Recchia, F., Kiss, G., Phong, V. H., Wu, J., Nishimura, D., Oikawa, H., Goigoux, T., Giovinazzo, J., Ascher, P., Agramunt, J., Ahn, D. S., Baba, H., Blank, B., Borcea, C., Boso, A., Davies, P., Diel, F., Dombardi, Zs., Doornenbal, P., Eberth, J., de France, G., Fujita, Y., Fukuda, N., Ganioglu, E., Gelletly, W., Gerbaux, M., Grevy, S., Guadilla, V., Inabe, N., Isobe, T., Kojouharov, I., Korten, W., Kubo, T., Kubono, S., Nieto, T. Kurtukian, Kurz, N., Lee, J., Lenzi, S., Liu, J., Lokotko, T., Lubos, D., Magron, C., Montaner-Piza, A., Napoli, D. R., Sakurai, H., Schaffner, H., Shimizu, Y., Sidong, C., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., Yagi, S., Morales, A. I., Algora, A., Rubio, B., Kaneko, K., Nishimura, S., Aguilera, P., Orrigo, S. E. A., Molina, F., de Angelis, G., Recchia, F., Kiss, G., Phong, V. H., Wu, J., Nishimura, D., Oikawa, H., Goigoux, T., Giovinazzo, J., Ascher, P., Agramunt, J., Ahn, D. S., Baba, H., Blank, B., Borcea, C., Boso, A., Davies, P., Diel, F., Dombardi, Zs., Doornenbal, P., Eberth, J., de France, G., Fujita, Y., Fukuda, N., Ganioglu, E., Gelletly, W., Gerbaux, M., Grevy, S., Guadilla, V., Inabe, N., Isobe, T., Kojouharov, I., Korten, W., Kubo, T., Kubono, S., Nieto, T. Kurtukian, Kurz, N., Lee, J., Lenzi, S., Liu, J., Lokotko, T., Lubos, D., Magron, C., Montaner-Piza, A., Napoli, D. R., Sakurai, H., Schaffner, H., Shimizu, Y., Sidong, C., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., and Yagi, S.
Abstract: The beta decay of the odd-odd nucleus Br-70 has been investigated with the BigRIPS and EURICA setups at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center. The T = 0(J(pi) = 9(+)) and T = 1(J(pi) = 0(+)) isomers have both been produced in in-flight fragmentation of Kr-78 with ratios of 41.6(8)% and 58.4(8)%, respectively. A half-life of t(1/2) = 2157(-49)(+53) ms has been measured for the J pi = 9(+) isomer from gamma-ray time decay analysis. Based on this result, we provide a new value of the half-life for the J pi = 0(+) ground state of Br-70, t(1/2) = 78.42 +/- 0.51 ms, which is slightly more precise, and in excellent agreement, with the best measurement reported hitherto in the literature. For this decay, we provide the first estimate of the total branching fraction decaying through the 2(1)(+) state in the daughter nucleus Se-70, R(2(1)(+)) = 1.3 +/- 1.1%. We also report four new low-intensity gamma-ray transitions at 661, 1103, 1561, and 1749 keV following the beta decay of the J pi = 9(+) isomer. Based on their coincidence relationships, we tentatively propose two new excited states at 3945 and 4752 keV in 70Se with most probable spins and parities of J(pi) = (6(+)) and (8(+)), respectively. The observed structure is interpreted with the help of shell-model calculations, which predict a complex interplay between oblate and prolate configurations at low excitation energies.
Published: 2017

26. Properties of gamma-decaying isomers and isomeric ratios in the Sn-100 region

Author: Park, J., Krucken, R., Lubos, D., Gernhaeuser, R., Lewitowicz, M., Nishimura, S., Ahn, D. S., Baba, H., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Celikovic, I., de France, G., Doornenbal, P., Faestermann, T., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Gorska, M., Grawe, H., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y. -K., Kojouharov, I., Kubo, T., Kurz, N., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I., Patel, Z., Rajabali, M. M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L., Soderstrom, P. -A., Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Watanabe, H., Wu, J., Xu, Z. Y., Park, J., Krucken, R., Lubos, D., Gernhaeuser, R., Lewitowicz, M., Nishimura, S., Ahn, D. S., Baba, H., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Celikovic, I., de France, G., Doornenbal, P., Faestermann, T., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Gorska, M., Grawe, H., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y. -K., Kojouharov, I., Kubo, T., Kurz, N., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I., Patel, Z., Rajabali, M. M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L., Soderstrom, P. -A., Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Watanabe, H., Wu, J., and Xu, Z. Y.
Abstract: Half-lives and energies of gamma rays emitted in the decay of isomeric states of nuclei in the vicinity of the doubly magic Sn-100 weremeasured in a decay spectroscopy experiment at RikagakuKenkyusho (The Institute of Physical and Chemical Research) of Japan Nishina Center. The measured half-lives, some with improved precision, are consistent with literature values. Three new results include a 55-keV E2 gamma ray from a new (4(+)) isomer with T-1/2 = 0.23(6) mu s in Rh-92, a 44-keV E2 gamma ray from the (15(+)) isomer in Ag-96, and T-1/2(6(+)) = 13(2) ns in Cd-98. Shell-model calculations of electromagnetic transition strengths in the (p(1/2), g(9/2)) model space agree with the experimental results. In addition, experimental isomeric ratios were compared to the theoretical predictions derived with an abrasion-ablation model and the sharp cutoff model. The results agreed within a factor of 2 for most isomers. From the nonobservation of time-delayed gamma rays in Sn-100, new constraints on the T-1/2, gamma-ray energy, and internal conversion coefficients are proposed for the hypothetical isomer in Sn-100.
Published: 2017

27. Lithium-excess olivine electrode for lithium rechargeable batteries

Author: Park, KY, Park, KY, Park, I, Kim, H, Yoon, G, Gwon, H, Cho, Y, Yun, YS, Kim, JJ, Lee, S, Ahn, D, Kim, Y, Hwang, I, Yoon, WS, Kang, K, Park, KY, Park, KY, Park, I, Kim, H, Yoon, G, Gwon, H, Cho, Y, Yun, YS, Kim, JJ, Lee, S, Ahn, D, Kim, Y, Hwang, I, Yoon, WS, and Kang, K
Abstract: Lithium iron phosphate (LFP) has attracted tremendous attention as an electrode material for next-generation lithium-rechargeable battery systems due to the use of low-cost iron and its electrochemical stability. While the lithium diffusion in LFP, the essential property in battery operation, is relatively fast due to the one-dimensional tunnel present in the olivine crystal, the tunnel is inherently vulnerable to the presence of FeLi anti-site defects (Fe ions in Li ion sites), if any, that block the lithium diffusion and lead to inferior performance. Herein, we demonstrate that the kinetic issue arising from the FeLi defects in LFP can be completely eliminated in lithium-excess olivine LFP. The presence of an excess amount of lithium in the Fe ion sites (LiFe) energetically destabilizes the FeLi-related defects, resulting in reducing the amount of Fe defects in the tunnel. Moreover, we observe that the spinodal decomposition barrier is notably reduced in lithium-excess olivine LFP. The presence of LiFe and the absence of FeLi in lithium-excess olivine LFP additionally induce faster kinetics, resulting in an enhanced rate capability and a significantly reduced memory effect. The lithium-excess concept in the electrode crystal brings up unexpected properties for the pristine crystal and offers a novel and interesting approach to enhance the diffusivity and open up additional diffusion paths in solid-state ionic conductors.
Published: 2016

28. New neutron-deficient isotopes from Kr-78 fragmentation

Author: Blank, B., Goigoux, T., Ascher, P., Gerbaux, M., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Agramunt, J., Algora, A., Guadilla, V., Montaner-Piza, A., Morales, A. I., Orrigo, S. E. A., Rubio, B., Ahn, D. S., Doornenbal, P., Fukuda, N., Inabe, N., Kiss, G., Kubo, T., Kubono, S., Nishimura, S., Phong, V. H., Sakurai, H., Shimizu, Y., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Wu, J., Fujita, Y., Tanaka, M., Gelletly, W., Aguilera, P., Molina, F., Diel, F., Lubos, D., de Angelis, G., Napoli, D., Borcea, C., Boso, A., Cakirli, R. B., Ganioglu, E., Chiba, J., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Wimmer, K., de France, G., Go, S., Blank, B., Goigoux, T., Ascher, P., Gerbaux, M., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Agramunt, J., Algora, A., Guadilla, V., Montaner-Piza, A., Morales, A. I., Orrigo, S. E. A., Rubio, B., Ahn, D. S., Doornenbal, P., Fukuda, N., Inabe, N., Kiss, G., Kubo, T., Kubono, S., Nishimura, S., Phong, V. H., Sakurai, H., Shimizu, Y., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Wu, J., Fujita, Y., Tanaka, M., Gelletly, W., Aguilera, P., Molina, F., Diel, F., Lubos, D., de Angelis, G., Napoli, D., Borcea, C., Boso, A., Cakirli, R. B., Ganioglu, E., Chiba, J., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Wimmer, K., de France, G., and Go, S.
Abstract: In an experiment with the RIKEN projectile fragment separator called BigRIPS at the RIKEN Nishina Center, the fragmentation of a Kr-78 beam allowed the observation of new neutron-deficient isotopes at the proton drip line. Clean identification spectra could be produced and Se-63, Kr-67, and Kr-68 were identified for the first time. In addition, Ge-59 was also observed. Three of these isotopes, Ge-59, Se-63, and Kr-67, are potential candidates for ground-state two-proton radioactivity. In addition, the isotopes Ge-58, Se-62, and Kr-66 were also sought but without success. The present experiment also allowed the determination of production cross sections for some of the most exotic isotopes. These measurements confirm the trend already observed that the empirical parametrization of fragmentation cross sections, EPAX, significantly overestimates experimental cross sections in this mass region.
Published: 2016

29. New Isotopes and Proton Emitters-Crossing the Drip Line in the Vicinity of Sn-100

Author: Celikovic, I., Lewitowicz, M., Gernhaeuser, R., Krucken, R., Nishimura, S., Sakurai, H., Ahn, D. S., Baba, H., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., de France, G., Doornenbal, P., Faestermann, T., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Gorska, M., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, Y. -K., Kwon, Y. K., Kojouharov, I., Kubo, T., Kurz, N., Lorusso, G., Lubos, D., Moschner, K., Murai, D., Nishizuka, I., Park, J., Patel, Z., Rajabali, M., Rice, S., Schaffner, H., Shimizu, Y., Sinclair, L., Soderstrom, P. -A., Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Watanabe, H., Wu, J., Xu, Z., Celikovic, I., Lewitowicz, M., Gernhaeuser, R., Krucken, R., Nishimura, S., Sakurai, H., Ahn, D. S., Baba, H., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., de France, G., Doornenbal, P., Faestermann, T., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Gorska, M., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, Y. -K., Kwon, Y. K., Kojouharov, I., Kubo, T., Kurz, N., Lorusso, G., Lubos, D., Moschner, K., Murai, D., Nishizuka, I., Park, J., Patel, Z., Rajabali, M., Rice, S., Schaffner, H., Shimizu, Y., Sinclair, L., Soderstrom, P. -A., Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Watanabe, H., Wu, J., and Xu, Z.
Abstract: Several new isotopes, In-96, Cd-94, Ag-92, and Pd-90, have been identified at the RIKEN Nishina Center. The study of proton drip-line nuclei in the vicinity of Sn-100 led to the discovery of new proton emitters Ag-93 and Rh-89 with half-lives in the submicrosecond range. The systematics of the half-lives of odd-Z nuclei with T-z = -1/2 toward Sn-99 shows a stabilizing effect of the Z = 50 shell closure. Production cross sections for nuclei in the vicinity of Sn-100 measured at different energies and target thicknesses were compared to the cross sections calculated by EPAX taking into account contributions of secondary reactions in the primary target.
Published: 2016

30. Two-Proton Radioactivity of Kr-67

Author: Goigoux, T., Ascher, P., Blank, B., Gerbaux, M., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Doornenbal, P., Kiss, G. G., Nishimura, S., Soederstroem, P. -A., Phong, V. H., Wu, J., Ahn, D. S., Fukuda, N., Inabe, N., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Agramunt, J., Algora, A., Guadilla, V., Montaner-Piza, A., Morales, A. I., Orrigo, S. E. A., Rubio, B., Fujita, Y., Tanaka, M., Gelletly, W., Aguilera, P., Molina, F., Diel, F., Lubos, D., de Angelis, G., Napoli, D., Borcea, C., Boso, A., Cakirli, R. B., Ganioglu, E., Chiba, J., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Wimmer, K., de France, G., Go, S., Brown, B. A., Goigoux, T., Ascher, P., Blank, B., Gerbaux, M., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Doornenbal, P., Kiss, G. G., Nishimura, S., Soederstroem, P. -A., Phong, V. H., Wu, J., Ahn, D. S., Fukuda, N., Inabe, N., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Agramunt, J., Algora, A., Guadilla, V., Montaner-Piza, A., Morales, A. I., Orrigo, S. E. A., Rubio, B., Fujita, Y., Tanaka, M., Gelletly, W., Aguilera, P., Molina, F., Diel, F., Lubos, D., de Angelis, G., Napoli, D., Borcea, C., Boso, A., Cakirli, R. B., Ganioglu, E., Chiba, J., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Wimmer, K., de France, G., Go, S., and Brown, B. A.
Abstract: In an experiment with the BigRIPS separator at the RIKEN Nishina Center, we observed two-proton (2p) emission from Kr-67. At the same time, no evidence for 2p emission of Ge-59 and Se-63, two other potential candidates for this exotic radioactivity, could be observed. This observation is in line with Q value predictions which pointed to Kr-67 as being the best new candidate among the three for two-proton radioactivity. Kr-67 is only the fourth 2p ground-state emitter to be observed with a half-life of the order of a few milliseconds. The decay energy was determined to be 1690(17) keV, the 2p emission branching ratio is 37(14)%, and the half-life of Kr-67 is 7.4(30) ms.
Published: 2016

31. Two different phase-change origins with chemical- and structural-phase-changes in C doped (1.5 wt.%) In3Sb1Te2

Author: Lee, Y. M., Lee, S. Y., Kim, K., Sasaki, T., Ahn, D., Jung, Min-Cherl, Lee, Y. M., Lee, S. Y., Kim, K., Sasaki, T., Ahn, D., and Jung, Min-Cherl
Abstract: application/pdf, We fabricated C-doped (1.5 wt.%) In3Sb1Te2 (CIST) thin films with amorphous phase (a-CIST) using a sputter method. Two electrical-phase-changes at 250 and 275 °C were observed in the sheet resistance measurement. In order to understand the origin of these electrical-phase-changes, all samples were characterized by XRD, TEM, and HRXPS with synchrotron radiation. In a-CIST, only weak Sb-C bonding was observed. In the first electrical-phase-change at 250 °C, strong Sb-C bonding occurred without an accompanying structural/phase change (still amorphous). On the other hand, the second electrical-phase-change at 275 °C was due to the structural/phase change from amorphous to crystalline without a chemical state change.
Published: 2016

32. Quantum state cloning in the presence of a closed timelike curve

Author: Ahn, D., Myers, C. R., Ralph, T. C., Mann, R. B., Ahn, D., Myers, C. R., Ralph, T. C., and Mann, R. B.
Abstract: The possible existence of closed timelike curves (CTCs) draws attention to fundamental questions about what is physically possible and what is not. An example is the "no cloning theorem" in quantum mechanics, which states that no physical means exists by which an unknown arbitrary quantum state can be reproduced or copied perfectly. Using the Deutsch approach, we have shown that the no-cloning theorem can be circumvented in the presence of closed timelike curves, allowing the perfect cloning of a quantum state chosen randomly from a finite alphabet of states. Further, we show that a universal cloner can be constructed that when acting on a completely arbitrary qubit state, exceeds the no-cloning bound on fidelity. Since the no cloning theorem has played a central role in the development of quantum information science, it is clear that the existence of closed timelike curves would radically change the rules for quantum information technology. Nevertheless, we show that this type of cloning does not violate no-signalling criteria., Comment: arXiv admin note: substantial text overlap with arXiv:1008.0221
Published: 2012
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33. Any quantum state can be cloned in the presence of closed timelike curves

Author: Ahn, D., Ralph, T. C., Mann, R. B., Ahn, D., Ralph, T. C., and Mann, R. B.
Abstract: The possible existence of closed timelike curves (CTCs) draws attention to fundamental questions about what is physically possible and what is not. An example is the "no cloning theorem" in quantum mechanics, which states that no physical means exists by which an unknown arbitrary quantum state can be reproduced or copied perfectly. Using the Deutsch approach, we show here that this theorem can be circumvented in the presence of closed timelike curves, allowing the cloning of an unknown arbitrary quantum state chosen from a finite alphabet of states. Since the "no cloning theorem" has played a central role in the development of quantum information science, it is clear that the existence of CTCs would radically change the rules for quantum information technology. Nevertheless we show that this type of cloning does not violate no-signalling criteria., Comment: Errors in example construction corrected
Published: 2010

34. Near-threshold Lambda(1520) production by the gamma p -> K+Lambda(1520) reaction at forward K+ angles

Author: Kohri, H., Ahn, D. S., Ahn, J. K., Akimune, H., Chang, W. C., Date', S., Ejiri, H., Fukui, S., Fujimura, H., Fujiwara, M., Hicks, K., Hosaka, A., Hotta, T., Imai, K., Ishikawa, T., Iwata, T., Kino, K., Makino, S., Matsuda, T., Mibe, T. Matsumura T., Miyabe, M., Miyachi, Y., Muramatsu, N., Nakano, T., Nam, S. i., Niiyama, M., Nomachi, M., Ohashi, Y., Rangacharyulu, C., Sakaguchi, A., Shimizu, H., Sugaya, Y., Sumihama, M., Titov, A. I., Toi, Y., Yonehara, K., Yorita, T., Yosoi, M., Zegers, R. G. T., Kohri, H., Ahn, D. S., Ahn, J. K., Akimune, H., Chang, W. C., Date', S., Ejiri, H., Fukui, S., Fujimura, H., Fujiwara, M., Hicks, K., Hosaka, A., Hotta, T., Imai, K., Ishikawa, T., Iwata, T., Kino, K., Makino, S., Matsuda, T., Mibe, T. Matsumura T., Miyabe, M., Miyachi, Y., Muramatsu, N., Nakano, T., Nam, S. i., Niiyama, M., Nomachi, M., Ohashi, Y., Rangacharyulu, C., Sakaguchi, A., Shimizu, H., Sugaya, Y., Sumihama, M., Titov, A. I., Toi, Y., Yonehara, K., Yorita, T., Yosoi, M., and Zegers, R. G. T.
Abstract: Differential cross sections and photon-beam asymmetries for the gamma p -> K+ Lambda(1520) reaction have been measured with linearly polarized photon beams at energies from the threshold to 2.4 GeV at 0.6=5/2 or by a new reaction process, for example an interference effect with the phi photoproduction having a similar bump structure in the cross sections., Comment: 5 pages, 4 figures, published in Phys. Rev. Lett
Published: 2009
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35. The black hole final state for the Dirac fields In Schwarzschild spacetime

Author: Ahn, D., Moon, Y. H., Mann, R. B., Fuentes-Schuller, I., Ahn, D., Moon, Y. H., Mann, R. B., and Fuentes-Schuller, I.
Abstract: We show that the internal stationary state of a black hole for massless Dirac fields can be represented by an entangled state of collapsing matter and infalling Hawking radiation. This implies that the Horowitz-Maldacena conjecture for the black hole final state originally proposed for the massless scalar fields is also applicable to fermionic fields as well. For an initially mixed state we find that the measure of mixedness is expected to decrease under evaporation.
Published: 2008
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36. Photoproduction of Lambda(1405) and Sigma^{0}(1385) on the proton at E_\gamma = 1.5-2.4 GeV

Author: Niiyama, M., Fujimura, H., Ahn, D. S., Ahn, J. K., Ajimura, S., Bhang, H. C., Chang, T. H., Chang, W. C., Chen, J. Y., Daté, S., Fukui, S., Funahashi, H., Hicks, K., Horie, K., Hotta, T., Imai, K., Ishikawa, T., Kato, Y., Kino, K., Kohri, H., Makino, S., Matsumura, T., Mibe, T., Miwa, K., Miyabe, M., Muramatsu, N., Nakamura, M., Nakano, T., Nakatsugawa, Y., Ohashi, Y., Oshuev, D. S., Saito, N., Sawada, T., Sugaya, Y., Sumihama, M., Tang, J. L., Uchida, M., Wang, C. W., Yorita, T., Yosoi, M., Niiyama, M., Fujimura, H., Ahn, D. S., Ahn, J. K., Ajimura, S., Bhang, H. C., Chang, T. H., Chang, W. C., Chen, J. Y., Daté, S., Fukui, S., Funahashi, H., Hicks, K., Horie, K., Hotta, T., Imai, K., Ishikawa, T., Kato, Y., Kino, K., Kohri, H., Makino, S., Matsumura, T., Mibe, T., Miwa, K., Miyabe, M., Muramatsu, N., Nakamura, M., Nakano, T., Nakatsugawa, Y., Ohashi, Y., Oshuev, D. S., Saito, N., Sawada, T., Sugaya, Y., Sumihama, M., Tang, J. L., Uchida, M., Wang, C. W., Yorita, T., and Yosoi, M.
Abstract: Differential cross sections for $\gamma p \to K^+\Lambda(1405)$ and $\gamma p \to K^+\Sigma^0(1385)$ reactions have been measured in the photon energy range from 1.5 to 2.4 GeV and the angular range of $0.8<\cos(\Theta)<1.0$ for the $K^+$ scattering angle in the center-of-mass system. This data is the first measurement of the $\Lambda(1405)$ photoproduction cross section. The lineshapes of \LamS measured in $\Sigma^+\pi^-$ and $\Sigma^-\pi^+$ decay modes were different with each other, indicating a strong interference of the isospin 0 and 1 terms of the $\Sigma\pi$ scattering amplitudes. The ratios of \LamS production to \SigS production were measured in two photon energy ranges: near the production threshold ($1.5
Published: 2008
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37. Forward coherent $\phi$-meson photoproduction from deuterons near threshold

Author: Chang, W. C., Horie, K., Shimizu, S., Miyabe, M., Ahn, D. S., Ahn, J. K., Akimune, H., Asano, Y., Date, S., Ejiri, H., Fukui, S., Fujimura, H., Fujiwara, M., Hasegawa, S., Hicks, K., Hotta, T., Imai, K., Ishikawa, T., Iwata, T., Kato, Y., Kawai, H., Kim, Z. Y., Kino, K., Kohri, H., Kumagai, N., Lin, P. J., Makino, S., Matsuda, T., Matsumura, T., Matsuoka, N., Mibe, T., Miyachi, Y., Morita, M., Muramatsu, N., Nakano, T., Niiyama, M., Nomachi, M., Ohashi, Y., Ohkuma, H., Ooba, T., Oshuev, D. S., Rangacharyulu, C., Sakaguchi, A., Sasaki, T., Shagin, P. M., Shiino, Y., Shimizu, A., Shimizu, H., Sugaya, Y., Sumihama, M., Toi, Y., Toyokawa, H., Wakai, A., Wang, C. W., Wang, S. C., Yonehara, K., Yorita, T., Yoshimura, M., Yosoi, M., Zegers, R. G. T., Chang, W. C., Horie, K., Shimizu, S., Miyabe, M., Ahn, D. S., Ahn, J. K., Akimune, H., Asano, Y., Date, S., Ejiri, H., Fukui, S., Fujimura, H., Fujiwara, M., Hasegawa, S., Hicks, K., Hotta, T., Imai, K., Ishikawa, T., Iwata, T., Kato, Y., Kawai, H., Kim, Z. Y., Kino, K., Kohri, H., Kumagai, N., Lin, P. J., Makino, S., Matsuda, T., Matsumura, T., Matsuoka, N., Mibe, T., Miyachi, Y., Morita, M., Muramatsu, N., Nakano, T., Niiyama, M., Nomachi, M., Ohashi, Y., Ohkuma, H., Ooba, T., Oshuev, D. S., Rangacharyulu, C., Sakaguchi, A., Sasaki, T., Shagin, P. M., Shiino, Y., Shimizu, A., Shimizu, H., Sugaya, Y., Sumihama, M., Toi, Y., Toyokawa, H., Wakai, A., Wang, C. W., Wang, S. C., Yonehara, K., Yorita, T., Yoshimura, M., Yosoi, M., and Zegers, R. G. T.
Abstract: Differential cross sections and decay asymmetries for coherent $\phi$-meson photoproduction from deuterons were measured for the first time at forward angles using linearly polarized photons at $E_{\gamma}$= 1.5-2.4 GeV. This reaction offers a unique way to directly access natural-parity Pomeron dynamics and gluon exchange at low energies. The cross sections at zero degrees increase with increasing photon energy. The decay asymmetries demonstrate a complete dominance of natural-parity exchange processes, showing that isovector unnatural-parity $\pi$-meson exchange is small. Nevertheless the deduced cross sections of $\phi$-mesons from nucleons contributed by isoscalar t-channel exchange processes are not well described by the conventional Pomeron model., Comment: 14 pages, 6 figures. Final published version
Published: 2007
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38. Axial variation in the threespine stickleback: relationship to Hox gene expression

Author: Department of Biology, University of Michigan, Ann Arbor, MI 48109, USA, US, Ann Arbor, Ahn, D., Gibson, Greg, Department of Biology, University of Michigan, Ann Arbor, MI 48109, USA, US, Ann Arbor, Ahn, D., and Gibson, Greg
Abstract: Despite mounting evidence that key developmental regulator genes are involved in significant macroevolutionary changes, there have been few studies demonstrating the functional significance of variation in such genes for the generation of population-level variation. In this study we examined and compared the expression domains of three Hox gene homeobox sequences in embryos derived from two morphologically distinct populations of the threespine stickleback, Gasterosteus aculeatus . We found within-population variation in the location of anterior limits, particularly in more 5??? Hox genes whose anterior expression domains showed graded distributions of transcripts over several somites. However, despite considerable and statistically significant differences in the anteroposterior pattern of the axial and median skeletons between the two stickleback populations, this phenotypic variation was not found to be correlated with any of the variation in Hox gene expression. The possible functional significance of the combinatorial Hox code in fish species is discussed with respect to the buffering of development in fluctuating environments, and it is argued that population and quantitative genetic perspectives should also be taken into account in considering the function and evolution of Hox genes.
Published: 2006

39. Representing and Querying Multi-dimensional Markup for Question Answering.

Author: Alink, W. (Wouter), Jijkoun, V., Ahn, D., Rijke, M. (Maarten) de, Boncz, P.A. (Peter), Vries, A.P. (Arjen) de, Alink, W. (Wouter), Jijkoun, V., Ahn, D., Rijke, M. (Maarten) de, Boncz, P.A. (Peter), and Vries, A.P. (Arjen) de
Abstract: This paper describes our approach to representing and querying multi-dimensional, possibly overlapping text annotations, as used in our question answering (QA) system. We use a system extending XQuery, the W3C-standard XML query language, with new axes that allow one to jump easily between different annotations of the same data. The new axes are formulated in terms of (partial) overlap and containment. All annotations are made using stand-off XML in a single document, which can be efficiently queried using the XQuery extension. The system is scalable to gigabytes of XML annotations. We show examples of the system in QA scenarios.
Published: 2006

40. Differential cross section and photon beam asymmetry for the gamma n -> K+ Sigma- reaction at Egamma=1.5-2.4 GeV

Author: Kohri, H., Ahn, D. S., Ahn, J. K., Akimune, H., Asano, Y., Chang, W. C., Date', S., Ejiri, H., Fukui, S., Fujimura, H., Fujiwara, M., Hasegawa, S., Hicks, K., Hotta, T., Imai, K., Ishikawa, T., Iwata, T., Kawai, H., Kino, K., Makino, S., Mart, T., Matsuda, T., Matsumura, T., Mibe, T., Miyabe, M., Miyachi, Y., Muramatsu, N., Nakano, T., Niiyama, M., Nomachi, M., Ohashi, Y., Ooba, T., Oshuev, D. S., Rangacharyulu, C., Sakaguchi, A., Shagin, P. M., Shimizu, A., Shimizu, H., Sugaya, Y., Sumihama, M., Toi, Y., Toyokawa, H., Yonehara, K., Yorita, T., Yoshimura, M., Yosoi, M., Zegers, R. G. T., Kohri, H., Ahn, D. S., Ahn, J. K., Akimune, H., Asano, Y., Chang, W. C., Date', S., Ejiri, H., Fukui, S., Fujimura, H., Fujiwara, M., Hasegawa, S., Hicks, K., Hotta, T., Imai, K., Ishikawa, T., Iwata, T., Kawai, H., Kino, K., Makino, S., Mart, T., Matsuda, T., Matsumura, T., Mibe, T., Miyabe, M., Miyachi, Y., Muramatsu, N., Nakano, T., Niiyama, M., Nomachi, M., Ohashi, Y., Ooba, T., Oshuev, D. S., Rangacharyulu, C., Sakaguchi, A., Shagin, P. M., Shimizu, A., Shimizu, H., Sugaya, Y., Sumihama, M., Toi, Y., Toyokawa, H., Yonehara, K., Yorita, T., Yoshimura, M., Yosoi, M., and Zegers, R. G. T.
Abstract: Differential cross sections and photon beam asymmetries have been measured for the gamma n -> K+ Sigma- and gamma p -> K+ Sigma0 reactions separately using liquid deuterium and hydrogen targets with incident linearly polarized photon beams of Egamma=1.5-2.4 GeV at 0.6
Published: 2006
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41. Algorithms for automated negotiations and their applications in information privacy

Author: Li, H., Ahn, D., Hung, P.C.K., Li, H., Ahn, D., and Hung, P.C.K.
Abstract: Automated negotiations have been an active research topic for many years. Most of the research work on this area focuses either on the abstract and theoretical models or on the system architectures for standalone negotiation applications. There is little work on identifying and studying practical algorithms for automated negotiations. In this paper, two algorithms have been proposed and their innovative applications have been discussed. The first algorithm guarantees that negotiation results are Pareto optimal solutions. The second algorithm guarantees that an agreement can be agreed upon after a certain number of proposal/counterproposal exchanges. These two algorithms can be used in the two-phase model for the automated negotiation process. In addition to these algorithms, their applications in information privacy negotiation have been described. In the information privacy management domain for service industries, it is critical for service requestors to only reveal the absolute necessary private information to the service providers. Traditionally, service requestors usually give whatever private information service providers have asked for. The grave consequence is that service providers may misuse the private information provided by service requestors, even though the service providers may have promised not to reveal it. Algorithms described in this paper can facilitate the privacy negotiation process. In order to show the concept of negotiation in information privacy, credit card information has been used to illustrate the application of algorithms.
Published: 2004

42. Microwave Amplifiers.

Author: ILLINOIS UNIV AT URBANA ELECTROMAGNETICS LAB, Chuang, S L, Lee, S W, Lee, S M, Ahn, D, ILLINOIS UNIV AT URBANA ELECTROMAGNETICS LAB, Chuang, S L, Lee, S W, Lee, S M, and Ahn, D
Abstract: A two-dimensional model for GaAs MESFET has been developed to study its linear and nonlinear microwave performances. The I-V characteristics curves for the intrinsic GaAs MESFET are obtained and compared with those for experimental measurements. Scattering parameters are calculated using the complete microwave model, which includes the intrinsic model and the parasitic elements, and compared with experimental findings. Reasonably good agreement between our calculation and the experimental measurements are obtained. Microwave nonlinear performances for a GaAs MESFET are simulated based on the large signal model. The microwave ouput signal in the time domain is simulated with two large input signals of different frequencies. Then the output power at the fundamental, first-order, second-order, and third-order harmonics are obtained. The power gains for the fundamental and the third-order spur at different bias points are calculated. Various HEMT models have been investigated. Three analytical models, the classical Fermi-Dirac, the two-level two-dimensional Electron Gas (2DEG) and the extended 2DEG models, are employed to study the electron concentration at the heterointerface where the electrons have very high mobility which is responsible for the ultra-fast transistor action due to the separation of electrons and ionized donors. Finally, the microwave applications of the quantum-well Stark effect are investigated.
Published: 1988

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