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Neutron and proton energy spectra from the non-mesonic weak decays of HeΛ5 and CΛ12
Okada, S.,Ajimura, S.,Aoki, K.,Banu, A.,Bhang, H.C.,Fukuda, T.,Hashimoto, O.,Hwang, J.I.,Kameoka, S.,Kang, B.H.,Kim, E.H.,Kim, J.H.,Kim, M.J.,Maruta, T.,Miura, Y.,Miyake, Y.,Nagae, T.,Nakamura, M.,Nak Elsevier 2004 Physics letters: B Vol.597 No.3
<P><B>Abstract</B></P><P>We have simultaneously measured the energy spectra of neutrons and protons emitted in the non-mesonic weak decays of HeΛ5 and CΛ12 hypernuclei produced via the (<SUP>π+</SUP>,<SUP>K+</SUP>) reaction with much higher statistics than those of previous experiments. The neutron-to-proton yield ratios for both hypernuclei at a high energy threshold (60 MeV) were approximately equal to two, which suggests that the ratio of the neutron- and proton-induced decay channels, <SUB>Γn</SUB>(Λn→nn)/<SUB>Γp</SUB>(Λp→np), is about 0.5. In the neutron energy spectra, we found that the yield of the low-energy component is unexpectedly large, even for HeΛ5.</P>
Coincidence measurement of the nonmesonic weak decay of <sup>12</sup><sub><i>Λ</i></sub>C
Kim, M.J.,Ajimura, S.,Aoki, K.,Banu, A.,Bhang, H.,Fukuda, T.,Hashimoto, O.,Hwang, J.I.,Kameoka, S.,Kang, B.H.,Kim, E.H.,Kim, J.H.,Maruta, T.,Miura, Y.,Miyake, Y.,Nagae, T.,Nakamura, M.,Nakamura, S.N. Elsevier 2006 Physics letters: B Vol.641 No.1
<P><B>Abstract</B></P><P>We have measured the angular correlation of the pair nucleons <I>np</I> and <I>nn</I> emitted from the nonmesonic weak decay (NMWD) of <SUP>12</SUP><SUB><I>Λ</I></SUB>C produced via the (<SUP>π+</SUP>,<SUP>K+</SUP>) reaction in coincidence measurement. The Λp→np and Λn→nn modes were clearly identified by measuring the back-to-back correlation of the emitted nucleon pairs which is the characteristic of two-body kinematics. From the measured nucleon pair numbers <SUB>Nnn</SUB> and <SUB>Nnp</SUB>, the ratio <SUB>Γn</SUB>/<SUB>Γp</SUB> of the partial decay widths <SUB>Γn</SUB>(Λn→nn) and <SUB>Γp</SUB>(Λp→np) of <SUP>12</SUP><SUB><I>Λ</I></SUB>C was extracted to be 0.51±0.13(stat)±0.05(syst); this result is almost free from the ambiguity due to the nuclear final state interaction and 3-body decay process, which were inherent in the previous results. The obtained <SUB>Γn</SUB>/<SUB>Γp</SUB> ratio of <SUP>12</SUP><SUB><I>Λ</I></SUB>C (<I>p</I>-shell) is close to that of <SUP>5</SUP><SUB><I>Λ</I></SUB>He (<I>s</I>-shell). The results are consistent with those of recent theoretical calculations.</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.
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
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>
Dynamic PID Gain Changing Control for DC-DC Converter
Y. Furukawa,D. Mitsutake,T. Shirakawa,H. Maruta,F. Kurokawa 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper presents a digital control method where changes PID parameter setting dynamically to improve transient characteristics of dc-dc converters. In the conventional PID control, those control parameters are selected as suitable values to satisfy stable characteristics both in transient state and steady state and keep the stability of system. Therefore, the value of control parameter tends to be a small one. In this paper, we propose the method where the PID parameter setting is changed to the suitable one in the transient state, where the value of control parameter is designed just to improve the transient response and takes larger one compared to the conventional PID control method. Using the proposed method, the transient response can be improved without the loss of stability of dc-dc converter.