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Measurement of Unbound Excited States of 24O
Tshoo, K.,Satou, Y.,Nakamura, T.,Aoi, N.,Bhang, H. C.,Choi, S.,Deguchi, S.,Delaunay, F.,Gibelin, J.,Honda, T.,Ishihara, M.,Kawada, Y.,Kondo, Y.,Kobayashi, T.,Kobayashi, N.,Marques, F. M.,Matsushita, M Korean Physical Society 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.2
Tshoo, K.,Satou, Y.,Bertulani, C.A.,Bhang, H.,Choi, S.,Nakamura, T.,Kondo, Y.,Deguchi, S.,Kawada, Y.,Nakayama, Y.,Tanaka, K.N.,Tanaka, N.,Togano, Y.,Kobayashi, N.,Aoi, N.,Ishihara, M.,Motobayashi, T. Elsevier 2014 Physics letters: B Vol.739 No.-
<P><B>Abstract</B></P> <P>One-neutron knockout from <SUP>24</SUP>O leading to the first excited state in <SUP>23</SUP>O has been measured for a proton target at a beam energy of 62 MeV/nucleon. The decay energy spectrum of the neutron unbound state of <SUP>23</SUP>O was reconstructed from the measured four momenta of the <SUP>22</SUP>O fragment and emitted neutron. A sharp peak was found at <SUB> E decay </SUB> = 50 ± 3 keV , corresponding to an excited state in <SUP>23</SUP>O at 2.78 ± 0.11 MeV , as observed in previous measurements. The longitudinal momentum distribution for this state was consistent with <I>d</I>-wave neutron knockout, providing support for a <SUP> J π </SUP> assignment of 5 / <SUP> 2 + </SUP> . The associated spectroscopic factor was deduced to be <SUP> C 2 </SUP> S ( 0 <SUB> d 5 / 2 </SUB> ) = 4.1 ± 0.4 by comparing the measured cross section ( σ − 1 n exp = 61 ± 6 mb ) with a distorted wave impulse approximation calculation. Such a large occupancy for the neutron 0 <SUB> d 5 / 2 </SUB> orbital is in line with the N = 16 shell closure in <SUP>24</SUP>O.</P>
Invariant Mass Spectroscopy of 23O via the (p, p′) Reaction in Inverse Kinematics
Satou, Y.,Tshoo, K.,Bhang, H.,Choi, S.,Hwang, J. W.,Nakamura, T.,Kondo, Y.,Nakayama, Y.,Kobayashi, N.,Tanaka, K. N.,Deguchi, S.,Kawada, Y.,Tanaka, N.,Motobayashi, T.,Sakurai, H.,Otsu, H.,Aoi, N.,Takeu Springer-Verlag 2013 Few-body systems Vol.54 No.1
Invariant Mass Spectroscopy for the Neutron Rich Nuclei
Satou, Y.,Tshoo, K.,Bhang, H. C.,Choi, S. H.,Nakamura, T.,Kondo, Y.,Nakayama, Y.,Kobayashi, N.,Tanaka, K. N.,Deguchi, S.,Kawada, Y.,Tanaka, N.,Sugimoto, T.,Motobayashi, T.,Sakurai, H.,Otsu, H.,Aoi, N. Korean Physical Society 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.2
Overview of the ISOL Facility for the RISP
H. J. Woo,B. H. Kang,K. Tshoo,C. S. Seo,W. Hwang,Y-H. Park,J. W. Yoon,S. H. Yoo,김용균,D. Y. Jang 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.3
The key feature of the Isotope Separation On-Line (ISOL) facility is its ability to provide highintensityand high-quality beams of neutron-rich isotopes with masses in the range of 80 − 160 bymeans of a 70-MeV proton beam directly impinging on uranium-carbide thin-disc targets to performforefront research in nuclear structure, nuclear astrophysics, reaction dynamics and interdisciplinaryfields like medical, biological and material sciences. The technical design of the 10-kW and the 35-kW direct fission targets with in-target fission rates of up to 1014 fissions/s has been finished, andfor the development of the ISOL fission-target chemistry an initial effort has been made to produceporous lanthanum-carbide (LaCx) discs as a benchmark for the final production of porous UCxdiscs. For the production of various beams, three classes of ion sources are under development atRISP (Rare Isotope Science Project), the surface ion source, the plasma ion source (FEBIAD), thelaser ion source, and the engineering design of the FEBIAD is in progress for prototype fabrication. The engineering design of the ISOL target/ion source front-end system is also in progress, anda prototype will be used for an off-line test facility in front of the pre-separator. The technicaldesigns of other basic elements at the ISOL facility, such as the RF-cooler, the high-resolution massseparator, and the A/q separator, have been finished, and the results, along with the future plans,are introduced.
Technical design of an IH-type buncher for KoBRA at RAON
Hoeltermann H.,Ratzinger U.,Schweizer W.,Strehl D.,Schwarz M.,Haehnel H.,Tshoo Kyoungho,Ham C.,Kwak D.,Shin T. S.,Yoon D. 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.8
To satisfy the beam requirement of the KoBRA experiment (0.5 nsec in 1σ), rebunching is required in the energy range up to 15 A MeV and for particles with an A/q range from 1 to 7. In cooperation with IBS and Hanmac Corporation, BEVATECH proposed a five-gap IH-buncher cavity which has excellent bunching properties from 5 to 15 MeV/u. Main challenges in this project are the wide energy range and CW operation at RF power levels up to 20 kW. The cavity will offer an effective voltage amplitude of up to 1 MV. To provide the required cooling channels and cooling efficiency, the stems and drifttubes of this cavity will be 3D printed. This paper will discuss the technical design approach and give a status on the development of the buncher cavity.
Commissioning preparation of RAON rare isotope accelerator facility
정연세,Hong Seung-Woo,장현만,Ki Tae-Kyung,Kim Hyoung-Jin,Kim Young Jin,권면,Lee Jinho,Tshoo Kyoungho,Shin Taeksu 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.6
RAON (Rare isotope Accelerator complex for ON-line experiments), started by the Rare Isotope Science Project (RISP) in Dec 2011, is the fagship rare isotope accelerator facility in Korea to promote the fundamental science of rare isotopes and the application. The construction of facility buildings and installation of the low-energy superconducting linac (SCL3) including injector system, ISOL (Isotope Separation On-Line) for the rare isotope production, a recoil spectrometer KoBRA, and MR-TOF for the mass measurement system were fnished in 2021. Expecting the completion of the frst phase of the RAON construction project in 2022, the beam commissioning experiments of low-energy superconducting linac (SCL3) and the ISOL system are underway. The status and overview of the RAON accelerator facility are reported in this paper.
Rb and Cs ionization efficiency measurements for the RISP surface ionization source
Park, S.J.,Hong, S.G.,Ishiyama, H.,Hwang, W.,Jeong, J.W.,Lee, J.-H.,Seo, C.S.,Kang, B.-H.,Tshoo, K.,Woo, H.J.,Joung, M.J.,Kim, J.Y.,Jeong, S.C. Elsevier 2017 Nuclear instruments & methods in physics research. Vol.410 No.-
<P><B>Abstract</B></P> <P>We report on the experimental results of the ionization efficiency of Rb and Cs using a surface ionization source prototype at Rare Isotope Science Project (RISP) of Institute for Basic Science (IBS). A hot-cavity surface ionization source has been studied in an off-line test bench equipped with a mass separator and a beam diagnostic system which allow accurate ionization efficiency measurements. Ionization efficiencies of 76% and 77% have been measured for Rb and Cs, respectively, from the Ta prototype of the RISP surface ionization source.</P>