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Beam production of <sup>18</sup>Ne with in-flight method for alpha scattering at CRIB
Duy, N.N.,Chae, K.Y.,Cha, S.M.,Yamaguchi, H.,Abe, K.,Bae, S.H.,Binh, D.N.,Choi, S.H.,Hahn, K.I.,Hayakawa, S.,Hong, B.,Iwasa, N.,Kahl, D.,Khiem, L.H.,Kim, A.,Kim, D.H.,Kim, E.J.,Kim, G.W.,Kim, M.J.,Kwa Elsevier 2018 Nuclear Instruments & Methods in Physics Research. Vol.897 No.-
<P><B>Abstract</B></P> <P>We conducted a measurement of <SUP>18</SUP>Ne + α scattering in inverse kinematics, in order to search for experimental evidence of α -cluster structure in <SUP>22</SUP>Mg above the alpha threshold ( <SUB> E thr </SUB> = 8 . 14 MeV ) and determine the astrophysical rates of the <SUP>18</SUP>Ne( α , p)<SUP>21</SUP>Na reaction under the conditions of break-out from the Hot-CNO cycle. A high intensity <SUP>18</SUP>Ne beam at 2.54 AMeV was successfully produced at CRIB (CNS Radioactive Ion Beam separator) of the Center for Nuclear Study, the University of Tokyo. This paper presents the in-flight production of the radioactive <SUP>18</SUP>Ne beam by using the production reaction <SUP>3</SUP>He(<SUP>16</SUP>O, <SUP>18</SUP>Ne)n with a windowed cryogenic gas target, which was employed in the mentioned resonant α -scattering experiment.</P>
Study on α-cluster levels in non-4n nuclei using low-energy RI beams
Yamaguchi, H,Kahl, D,Hayakawa, S,Sakaguchi, Y,Abe, K,Nakao, T,Suhara, T,Iwasa, N,Kim, A,Kim, D H,Cha, S M,Kwag, M S,Lee, J H,Lee, E J,Chae, K Y,Wakabayashi, Y,Imai, N,Kitamura, N,Lee, P,Moon, J Y,Lee, IOP Publishing 2017 Journal of physics. Conference series Vol.863 No.-
K. Hirose,T. Ohtsuki,Y. Shibasaki,N. Iwasa,J. Hori,S. Sekimoto,K. Takamiya,H. Yashima,K. Nishio,Y. Kiyanagi 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The cross section for the neutron-induced fission of ^(237)Np was measured in an energy range from 0.1 eV to 2 keV using the lead slowing-down neutron spectrometer at the Research Reactor Institute, Kyoto University. The relative cross sections were obtained from the energy-dependent neutron flux measured using a BF^3 counter. The relative cross section for each (n,f) was normalized to the absolute value which obtained using the reference cross section for ^(235)U(n,f) between 100 eV and 1 keV.
Experimental investigation of a linear-chain structure in the nucleus <sup>14</sup>C
Yamaguchi, H.,Kahl, D.,Hayakawa, S.,Sakaguchi, Y.,Abe, K.,Nakao, T.,Suhara, T.,Iwasa, N.,Kim, A.,Kim, D.H.,Cha, S.M.,Kwag, M.S.,Lee, J.H.,Lee, E.J.,Chae, K.Y.,Wakabayashi, Y.,Imai, N.,Kitamura, N.,Lee North-Holland Pub. Co 2017 Physics letters. Section B Vol.766 No.-
It is a well-known fact that a cluster of nucleons can be formed in the interior of an atomic nucleus, and such clusters may occupy molecular-like orbitals, showing characteristics similar to normal molecules consisting of atoms. Chemical molecules having a linear alignment are commonly seen in nature, such as carbon dioxide. A similar linear alignment of the nuclear clusters, referred to as linear-chain cluster state (LCCS), has been studied since the 1950s, however, up to now there is no clear experimental evidence demonstrating the existence of such a state. Recently, it was proposed that an excess of neutrons may offer just such a stabilizing mechanism, revitalizing interest in the nuclear LCCS, specifically with predictions for their emergence in neutron-rich carbon isotopes. Here we present the experimental observation of α-cluster states in the radioactive <SUP>14</SUP>C nucleus. Using the Be10+α resonant scattering method with a radioactive beam, we observed a series of levels which completely agree with theoretically predicted levels having an explicit linear-chain cluster configuration. We regard this as the first strong indication of the linear-chain clustered nucleus.
Study of a-cluster Structure in 22Mg Using a Radioactive Ion Beam
차수미,K. Y. Chae,김민주,M. S. Kwag,E. J. Lee,K. Abe,S. Hayakawa,H. Shimizu,H. Yamaguchi,L. Yang,S. H. Bae,S. H. Choi,D. N. Binh,N. N. Duy,Z. Ge,V. H. Phong,K. I. Hahn,B. Hong,B. Moon,N. Iwasa,D. Kahl,L. H. 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.8
The ff-clusterization of an atomic nucleus has been studied for a long time, even from the earliest days of nuclear physics. Our understanding of the ff-cluster structure is, however, mainly limited to the self-conjugate A = 4n (n = 2; 3; 4; ) light nuclei and some of the neutron-rich radionuclides such as 10Be, 11B, and 14C. In order to study the ff-cluster structure of a neutron-deficient 22Mg nucleus, we have measured the 18Ne(ff, ff)18Ne scattering in inverse kinematics by using radioactive 18Ne beams and the 4He gas target at the Center for Nuclear Study radioactive ion beam separator of the University of Tokyo. Recoiling ff particles from the scattering were detected by using silicon strip detectors, which constitute E-E telescopes for particle identification. By adopting a thick target method, we were able to investigate a wide range of excitation energies Ex = 9:9 - 16.5 MeV in 22Mg in this work.
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.
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.