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Experimental Approach to Explosive Nucloeosynthesis with RI Beams
S. Kubono,Y. Yamaguchi,G. Amadio,S. Hayakawa,Y. Wakabayashi,Y. Kurihara,J. J. He,A. Saito,H. Fujikawa,Le Hong Khiem,M. Niikura,T. Teranishi,N. Iwasa,S. Kato,S. Nishimura,C. S. Lee,Y. K. Kwon,I. S. Hah 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
Experimental efforts to investigate stellar reactions under high-temperature and high density conditions have been made as a major program using the RI beams from the Center for Nuclear Study (CNS) low-energy in-flight RI beam separator (CRIB) at University of Tokyo in order to understand the evolution of the universe, as well as various stellar phenomena. Specically, two subjects of hydrogen burning are discussed here. One is a reaction study of the pp-chain and the second is of the explosive hydrogen burning, the rp-process. Some s-wave resonances have been identified by the thick target method in the crucial reaction processes in the hydrogen burning. The resonant scattering with the thick target method also succeeded in identifying inelastic resonant scattering, giving proton widths for the first excited state of the target nucleus. This provided very efficiently the reaction rate estimate for the process under high-temperature equilibrium conditions. Possibilities of the CRIB facility in near future are also briey discussed. Experimental efforts to investigate stellar reactions under high-temperature and high density conditions have been made as a major program using the RI beams from the Center for Nuclear Study (CNS) low-energy in-flight RI beam separator (CRIB) at University of Tokyo in order to understand the evolution of the universe, as well as various stellar phenomena. Specically, two subjects of hydrogen burning are discussed here. One is a reaction study of the pp-chain and the second is of the explosive hydrogen burning, the rp-process. Some s-wave resonances have been identified by the thick target method in the crucial reaction processes in the hydrogen burning. The resonant scattering with the thick target method also succeeded in identifying inelastic resonant scattering, giving proton widths for the first excited state of the target nucleus. This provided very efficiently the reaction rate estimate for the process under high-temperature equilibrium conditions. Possibilities of the CRIB facility in near future are also briey discussed.
Elastic Scattering of 120-MeV Alpha Particles by 28Si
Young Kwan Kwon,이춘식,Shigeru Kubono 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.5
The angular distributions of the elastic scattering of $\alpha$ particles by $^{28}$Si have been measured at an incident energy of 120 MeV throughout the angular range of $\theta_{c.m.}$ = 9.17$^{\circ}$ to 54.27$^{\circ}$. Elastic cross sections have been analyzed in terms of an optical model by using a six-parameter volume-type Woods-Saxon potential. Optical potential parameters have been obtained by using the ${\chi}^2$ minimization method to compare calculations to experiments. We have verified various possibilities of potential ambiguities by using a reduced-parameter fit and a systematic grid search. Consequently, we have obtained three different optical potential parameter sets for the $^{28}$Si + $\alpha$ reaction channel.
윤종철,김도균,김종찬,박규준,윤민영,Sigeru Kubono 한국물리학회 2006 새물리 Vol.53 No.2
A new beamline for medium-heavy nuclide AMS has been installed at the Seoul National University (SNU)-AMS facility. A transfer matrix for the beamline was determined by using the TRANSPORT program. A simulation of rare-isotope separation was performed by ray tracing using the TURTLE program. The simulation results, including the effect of the energy degrader, demonstrate the feasibility of separating of isobars with small mass differences in $^{10}$Be-$^{10}$B and $^{26}$Al-$^{26}$Mg. The beam profile of the carbon beam at the new beamline is consistent with the theoretically calculated of beam profile. 중핵 동위원소 AMS를 위한 새 빔라인을 일부 설치하였다. 빔라인은TRANSPORT를 사용하여 설계하였고, TURTLE를 사용하여 빔라인 내에서의입자 시뮬레이션을 수행하였다. 그리고 에너지 감쇄판을 이용한 분리시뮬레이션을 수행하여 그 가능성을 제시하였다. 실제 탄소 빔을입사시켜 빔 프로파일을 관측한 결과 이론적인 빔 프로파일과 잘일치하였다.
Astrophysically Important 26Si States Studied with the 28Si(4He,6He)26Si Reaction
Y. K. Kwon,이춘식,J. Y. Moon,J. H. Lee,J. Y. Kim,M. K. Cheoun,S. Kubono,H. Yamaguchi,J. J. He,A. Saito,Y. Wakabayashi,H. Fujikawa,G. Amadio,N. Iwasa,K. Inafuku,L. H. Khiem,M. Tanaka,Y. Fuchi,A. A. Chen,S 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
The emission of a 1.809-MeV γ-ray from the first excited state of 26Mg, followed by β-decay of 26Al in its ground state (denoted as 26Alg.s.), has been identied by several gamma-ray telescopes. To resolve the controversy over the possible sources of the observational 1.809-MeV γ-rays, one needs accurate knowledge of the production rate of 26Alg.s.. The 25Al(p,γ)26Si reaction is one of the most important astrophysical reactions to be investigated, but its rate is uncertain due to the lack of level information on 26Si above the proton threshold (Qpγ = 5.518 MeV). Illiadis et al. suggested that the 25Al(p,γ)26Si reaction should be dominated by a 3+ unnatural parity state at Ex = 5970 keV. Recent studies proposed several states as candidates for the 3+ states. However, the spin-parity assignments for these states are still uncertain. In the present work, we measured the 28Si(4He,6He)26Si reaction at 120 MeV to confirm the unnatural parity states just above the proton threshold. The measurement was performed with the high-resolution particle analyzer at the Center for Nuclear Study, University of Tokyo. We observed a total of 22 excited states in 26Si. The 7018-keV level, which was only observed by Bardayan et al. with the 28Si(p; t)26Si reaction, was confirmed in our measurement. Among the candidates of unnatural parity states at Ex = 5678, 5916, and 5945 keV, the 5918-keV state was only observed within the error of the excitation energy. A new state at Ex = 6101 keV was also identified.
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.
Development and Performance Test of the Analysis Software for the CRIB Active Target
이필수,이춘식,문준영,채경육,차수미,Hidetoshi Yamaguchi,Taro Nakao,David M. Kahl,Shigeru Kubono,Silvio Cherubini,Seiya Hayakawa,Cosimo Signorini 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.3
Software for genuinely event-by-event analysis and event reconstruction of data obtained by usingan active target has been developed in the graphical user interface under the CERN ROOT framework. The primary motivation for developing the software was to provide physicists who performexperiments using an active target a more user-friendly environment for the purpose of investigatingthe performance of detection systems and obtaining ideas about physics from a large amount ofexperimental data. To test the performance of the software, we analyzed experimental data froma 16N radioactive ion beam experiment for α-decay measurements. As a result of the analysis, weobserved the Bragg curve and measured the range of the 16N RI beam in the detector. Data werecalibrated against the calculation after comparing the Bragg curve to the one obtained from anenergy loss calculation in P-10 gas. We present a detailed description of the analysis software andits test results.
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.
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.