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Design Study for the KOBRA (KOrea Broad acceptance Recoil spectrometer and Apparatus) at RAON
박진식,권영관,문준영,Tetsuro Komatsubara,정인일,김용학,윤종철,김용균,Seigo Kato,문창범,채경육,Shigeru Kubono 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.3
The KOBRA (KOrea Broad acceptance Recoil spectrometer and Apparatus) is a multi-purposerecoil spectrometer for low-energy nuclear experiments at the RAON accelerator complex. It isdivided into two stages based on the operational function: the first stage (F0-F3) is an in-flightseparator or beam transport line, and the second stage (F3-F5) is a large acceptance spectrometer. For spectrometers using radioactive ion (RI) beams, high performance, such as high resolutionand large acceptance, are especially required due to the limit of quality of RI beams. In thisrespect, a dispersion-matching technique and a movable magnet system were employed for highresolution and large acceptance, respectively. Reaction spectra at the focal plane for the dispersionmatching mode were obtained and analyzed using a Monte Carlo simulation code. In addition, thegeometrical angular acceptances with respect to the distance between the reaction target and thefirst Q-pole doublet of the second stage were calculated, and the expected maximum solid angle ofthe spectrometer was estimated.
Yrast Band Based on the Proton h_(11/2) orbital in (125)^I
Moon Chang-Bum,Komatsubara Tetsuro 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
The excited states of the nucleus 125I have been studied by using in-beam ကray spectroscopy with the 116Cd (13C, p3n) 125I reaction at Elab = 62 MeV. The decay scheme of 125I was constructed by using က coincidence and က angular correlation analyses. In the present work, ve new transitions above the 27/2က level in the negative-parity band based on the proton h11=2 orbital in 125I were observed. The low-spin states below I = 23/2က in that yrast band could be interpreted as coming from the h11=2 conguration coupled to the neighboring Te core vibration. The 23/2က level was found to be associated with a near-oblate state based on a three-quasiproton alignment, namely the [h11=2]11=2က[(g7=2)2]6+ conguration with a deformation of 2 = 0.16 and = + 53. In contrast, the 27/2က level was thought to be associated with an aligned three-quasiparticle conguration based on a proton in the h11=2 orbital coupled to a pair of neutrons in the h11=2 orbital. In addition, an unusually low-lying 39/2က level was suggested as being a noncollective oblate state based on a ve-quasiparticle, [h11=2(g7=2)2]23=2က[(h11=2)2]8+, conguration.
Chang-Bum Moon,K Furuno,T Komatsubara 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.I
The excited states of the $^{115}$I nucleus have been studied by using in-beam $\gamma$-ray spectroscopy with the $^{89}$Y ($^{29}$Si, 3n) $^{115}$I reaction at a beam energy of 108 MeV. The level scheme of $^{115}$I was established by using $\gamma-\gamma$ coincidence and $\gamma-\gamma$ angular correlation analysis. In the present work, many collective bands built on the proton h$_{11/2}$, g$_{7/2}$, and d$_{5/2}$ were observed. Among them, an unfavored rotational band and a quasi-$\gamma$ band based on the $\pi$h$_{11/2}$ configuration was newly identified. A well-developed rotational band built on the 7/2$^+$ level was established up to I$^{\pi}$ = 47/2$^+$. This positive-collective band could be interpreted as coming from the $\pi$g$_{7/2}$ configuration at low spins. At higher spins above I$^{\pi}$ = 23/2$^+$, that band was found to be associated with the aligned three-quasiparticle configuration built on a proton in the g$_{7/2}$ orbital coupled to a pair of neutrons in the h$_{11/2}$ orbital.
Chang-Bum Moon,Kohei Furuno,Tetsuro Komatsubara 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.42
The excited states of the 122Xe nucleus have been studied by using in-beam -ray spectroscopy with the 109Ag (16O, p2n) 122Xe reaction at a beam energy of 80 MeV. The level scheme of 122Xe has been derived from - coincidence and - angular correlation analyses. A dipole band built on an excitation of 4827 keV, which was known to be negative parity, was found to be positive parity with the bandhead of I = 12+. That dipole band could be interpreted in terms of the semiclassical model as a four-quasiparticle band based on the prolate (g7=2h11=2)(d5=2h11=2) conguration with K = 7.
Signature Anomaly in the Yrare Band of 119Xe
C.-B.Moon,S.J.Chae,J.H.Ha,T.Komatsubara,Y.Sasaki,T.Jumatsu,K.Yamada,K.Satou,K.Furuno 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.41 No.2
The excited states of the $^{119}$Xe nucleus have been studied by using in-beam $\gamma$-ray spectroscopy with the $^{107}$Ag ($^{16}$O, p3n) $^{119}$Xe fusion-evaporation reaction at a beam energy of 85 MeV. The level scheme of $^{119}$Xe has been derived from $\gamma$-$\gamma$ coincidence and $\gamma$-$\gamma$ angular correlation analyses. We have, for the first time, established the second negative-parity favored and unfavored states built on the 11/2$^-$ state, namely the yrare rotational bands in $^{119}$Xe. In contrast to the behavior of the yrast bands where the favored states are lying lower in energy, the yrare favored states were observed to lie above the unfavored band. Such a signature inversion becomes normal at $I$=12 $\hbar$, which is the first observation of critical inversion-spin in an odd-mass Xe. We suggest that the signature inversion might be associated with a shape coexistence in terms of the $\gamma$ deformations between the favored and the unfavored yrare bands based on the coupling of the favored $h_{11/2}$ neutron with the even- and the odd-spin members of the $\gamma$ bands in even-even neighbors.
Design study for the KOBRA (KOrea Broad acceptance Recoil spectrometer and Apparatus) at RAON
Park, Junesic,Kwon, Young Kwan,Moon, Jun Young,Komatsubara, Tetsuro,Jung, In-Il,Kim, Yong Hak,Yun, Chong Cheoul,Kim, Yong-Kyun,Kato, Seigo,Moon, Chang-Bum,Chae, Kyung Yuk,Kubono, Shigeru 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.
Multi-Quasiparticle States in Odd-Odd 118I
C.-B. Moon,이춘식,M. Oshima,Y. Toh,J. Goto,Y. Hatsukawa,A. Kimura,M. Koizumi,A. Osa,T. Komatsubara,K. Miyakawa 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.4
The excited states of the doubly odd nucleus 118I have been studied by using in-beam γ-ray spectroscopy with the 110Cd(12C, p3n) reaction at Elab = 80 MeV. We have established several multi-quasiparticle states associated with different proton and neutron quasiparticle configurations. A I* = 14- level at 2561 keV was newly observed and found to be associated with the πh11/2υd5/2 configuration coupled to a pair of protons in the g7/2 orbital. TRS calculations for the 14- level indicated a favored oblate state based on the fully aligned four-quasiparticle π[h11=2(g7/2)2]23/2-υ[d5/2]5/2+ configuration. Another energetically favored state I* = 24- at 6216 keV could be interpreted as a noncollective oblate state from the fully aligned six-quasiparicle π[h11/2(g7/2)2]23/2-υ[d5/2(h11/2)2]25/2+ configuration. No Δ = 1 side band of the same parity as the πh11/2υh11/2 band was observed while a side band built on the πg9/2υh11/2 configuration was considered to be caused by the γ vibration coupling.
김아람,N. H. Lee,I. S. Hahn,J. S. Yoo,M. H. Han,S. Kubono,H. Yamaguchi,S. Hayakawa,Y. Wakabayashi,D. Binh,H. Hashimoto,T. Kawabata,D. Kahl,Y. Kurihara,Y. K. Kwon,T. Teranishi,S. Kato,T. Komatsubara,B. Gu 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.1
For the study of astrophysically important states in 18Ne, the 14O(α, α)14O cross section was measured in inverse kinematics using a radioactive 14O beam. This reaction was investigated for properties of resonant states of 18Ne for determining the 14O(α, p)17F reaction rate, which is one of the most important reactions for understanding the breakout mechanism from the Hot CNO cycle to the rp-process. Alpha-induced elastic scattering on 14O was performed using the lowenergy radioactive ion (RI) beam separator at the Center for Nuclear Study (CNS) in the RIKEN Accelerator Research Facility. The energy range Ex = 7.2 ∽ 13.1 MeV of 18Ne was scanned with the thick target method. Recoiled alpha particles were measured with Si dE-E telescopes. Spins and widths of three resonances at Ex = 8.6, 9.22, and 10.06 MeV were calculated using the R-matrix analysis, and a new state of 18Ne at Ex = 12.0 MeV was found in this experiment.