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Search for low-mass dark matter with CsI(Tl) crystal detectors
Lee, H. S.,Bhang, H.,Choi, J. H.,Choi, S.,Hahn, I. S.,Jeon, E. J.,Joo, H. W.,Kang, W. G.,Kim, B. H.,Kim, G. B.,Kim, H. J.,Kim, J. H.,Kim, K. W.,Kim, S. C.,Kim, S. K.,Kim, Y. D.,Kim, Y. H.,Lee, J. H.,L American Physical Society 2014 PHYSICAL REVIEW D - Vol.90 No.5
Bhange, D.,Ali, G.,Kim, D. H.,Anang, D.,Shin, T.,Kim, M. G.,Kang, Y. M.,Chung, K.,Nam, K. W. Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.3
<P>The need to find sodium ion battery (SIB) cathodes with high voltage, capacity and improved cycle life has stimulated research on sodium containing layered transition metal oxides. With this perspective, the electrochemical properties of highly ordered, honeycomb layered Na3Ni2BiO6 with a monoclinic superstructure are explored as a cathode material in SIBs. It has been demonstrated that Na3Ni2BiO6 delivers a discharge capacity of 106 mA h g(-1), having high voltage plateaus at 3.50 and 3.25 V, with marginal capacity fading after 50 cycles. Operando X-ray diffraction studies during charging/discharging reveal two reversible two-phase transition mechanisms (initial O3 phase -> P3 intermediate phase -> O1 final phase) during sodium extraction. Ex situ X-ray absorption spectroscopy reveals the charge compensation mechanism for the reversible Ni3+/Ni2+ as an active redox couple while Bi5+ being inactive during cycling. Extended X-ray absorption fine structure analysis shows highly reversible local structural changes around both Ni and Bi atoms occurring during electrochemical cycling. In addition, unique local structure changes especially around Ni atoms due to the honeycomb ordering and size mismatch between Ni2+ and Bi5+ ions are revealed by EXAFS analysis during charging and discharging, which is quite different from the local structure changes in regular layer structured NaMO2 (M = transition metals) cathode materials. The present results suggest that honeycomb layered metal oxides with the general formula, Na3M((II)) M-2(V) O-6, can be considered as candidates for high voltage and long life cathode materials for SIBs.</P>
The Weak Decay Widths of Λ Hypernuclei
H. Bhang,S. Ajimura,K. Aoki,A. Banu,T. Fukuda,O. Hashimoto,J. I. Hwang,S. Kameoka,B. H. Kang,E. Kim,김정호,T. Maruta,Y. Miura,Y. Miyake,T. Nagae,M. Nakamura,S. N. Nakamura,H. Noumi,S. Okada,Y. Okayasu,H. 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We have measured both the mesonic and nonmesonic weak decay widths of ^(12)_ΛC. For the mesonic decay, we have improved the accuracy of Γ_π^0 so that it reduced the error of Γ_(nm) from ≥10% to ≤5%. For the nonmesonic decay, we have solved the long standing Γ_n/Γ_p puzzle by measuring the ratio 0.51 ± 0.14 in the exclusive measurement. At the same time we have measured the width of the 3-body nonmesonic decay Γ_(2N) = 0.27 ± 0.13 for the first time. Combining the accurate Γ_n/Γ_p ratio and the first measured value Γ_(2N), we have finally obtained the Γ_n and Γ_p themselves taking account of the 3-body process. We have measured all the weak decay widths of _(12)_ΛC so that it provides the first complete set of widths for the investigation of ΔS = 1 baryon-baryon weak interaction.
MECHANISMS OF THE NONMESONIC WEAK DECAY OF Λ HYPERNUCLEI AND THE THREE-BODY PROCESS
BHANG, H.,AJIMURA, S.,AOKI, K.,BANU, A.,FUKUDA, T.,HASHIMOTO, O.,HWANG, J. I.,KAMEOKA, S.,KANG, B. H.,KIM, E.,KIM, J. H.,KIM, M.,MARUTA, T.,MIURA, Y.,MIYAKE, Y.,NAGAE, T.,NAKAMURA, M.,NAKAMURA, S. N. World Scientific 2009 Modern Physics Letters A Vol.24 No.11
<P> The long standing Γn/Γp puzzle of NMWD has finally been solved recently. It appears that the reason behind the puzzle was the universal quenching of nucleon yields from the prediction of one-nucleon induced (1N-) NMWD. We have shown that the quenching of nucleon yields can be explained only when we include a fairly large contribution of the three-body process (Γ2N) in Γnm. </P>
The Weak Decay Widths of ?? Hypernuclei
Bhang, H.,Ajimura, S.,Aoki, K.,Banu, A.,Fukuda, T.,Hashimoto, O.,Hwang, J. I.,Kameoka, S.,Kang, B. H.,Kim, E.,Kim, J. H.,Maruta, T.,Miura, Y.,Miyake, Y.,Nagae, T.,Nakamura, M.,Nakamura, S. N.,Noumi, H Korean Physical Society 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.2
Baryonic Weak Interaction Study in the Microlaboratory of Lambda-hypernuclei
H. Bhang 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.I
The decay of hypernuclei provides an ideal laboratory to study the strangeness changing baryonic weak interaction, +N ! N +N. Otherwise it would be difficult to study it since the process is difficult to realize in free space. Even though a considerable progress has been made recently, a consistent understanding of the (non-mesonic weak) decay of hypernuclei is yet to be achieved. The partial decay rates of the two decay branches, the neutron induced- and the proton inducednonmesonic weak decay, have not been determined accurately yet. Especially the relative ratio of the two has been a long standing puzzle in that the experimental ratios including the most recent KEK data indicate the dominance of the neutron induced channel while the theoretical predictions, mostly based on the meson exchange model, show the predominance of the proton induced channel. In addition to the diculty with the partial decay widths, the current theoretical model for the strangeness changing baryonic weak interaction predict large negative asymmetries in the angular distribution of the emitted protons while the most recently measured data of 5 He show small values close to zero. An preliminary analysis of the recently measured energy spectra of emitted neutron from 12 C shows for the rst time the dominance of the proton induced channel. Though this outcome seems to indicate that the long standing puzzle might be resolved, we should take it with a grain of salt. The decay asymmetry still remains to be understood.