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RISS 인기검색어
- 검색키워드
- 저자 : Mitsutaka Kanazawa (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Systematic Investigation on Momentum Distributions of Projectile-like Fragments at E/A = 290 MeV
Sadao Momota,Mitsutaka Kanazawa,Atsushi Kitagawa,Shinji Sato 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A systematic investigation on the longitudinal and transverse momentum (P_L and P_T distributions of projectile-like fragments (PLFs) produced at intermediate energies has been performed experimentally. The momentum distributions of PLFs in a broad range of mass and charge, produced from 290 MeV/u Ar- and Kr-beams with various targets (C, Al, Nb, Tb and Au), were observed. The analysis of P_L distributions with an asymmetric Gaussian function provides the deceleration effect and the width of the distributions with good precision. A definite systematics is found in both the deceleration effect and the width. The broader width obtained at the low-momentum side indicates the contribution of multi-step processes at this energy. The target and energy dependencies of the induced momentum width are also shown. The analysis of P_T distributions with an off-centered Gaussian function provides not only the width, but also the orbital-deflection effect. In principle, the width is independent on the target, and is consistently reproduced based on the previously proposed formulation. In contrast, the deflection effect shows a strong target dependence. In the case of one-nucleon removed fragments, the main part of the deflection effect can be understood by the Coulomb repulsion. The systematics of the momentum distributions, shown in the present studies, is important for evaluating the production cross sections of PLFs. Especially, the P_T distribution is crucial to deduce production cross sections from the production rates of PLFs, which are observed at the forward angle within the limited angular acceptance.
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Status of a Carbon-Ion Therapy Facility and Development for Advanced Treatment
Atsushi Kitagawa,Takashi Fujita,Akifumi Fukumura,Takuji Furukawa,Taku Inaniwa,Yoshiyuki Iwata,Tatsuaki Kanai,Mitsutaka Kanazawa,Nobuyuki Kanematsu,Yuki Kase,Masataka Komori,Koji Noda,Yumiko Ohno,Shinj 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
Over 3000 cancer patients have already been treated with 140- to 400-MeV/n carbon beams produced by the heavy ion medical accelerator in Chiba (HIMAC) at the National Institute of Radiological Sciences (NIRS) since 1994. These clinical results have clearly verified the advantages of carbon ions. Based on our experience at HIMAC, a hospital-specific facility optimized for carbon-ion therapy has been designed. The prototype developments of an electron cyclotron resonance (ECR) ion source, a radio frequency quadruple (RFQ) linac, an inter digital H (IH) linac, an acceleration system of synchrotron, a beam-delivery system and other key-technology parts have been successfully finished. Thus, in co-operation with NIRS, Gunma University has been constructing a carbon-therapy facility since April, 2006. If the present clinical results are to be improved, it is necessary to create a more accurate dose distribution on tumors without an undesired dose being deposited in normal tissue. Beam-scanning methods with respiration-gated irradiation are especially important to treat a cancer tumor located in the trunk of a patient. Over 3000 cancer patients have already been treated with 140- to 400-MeV/n carbon beams produced by the heavy ion medical accelerator in Chiba (HIMAC) at the National Institute of Radiological Sciences (NIRS) since 1994. These clinical results have clearly verified the advantages of carbon ions. Based on our experience at HIMAC, a hospital-specific facility optimized for carbon-ion therapy has been designed. The prototype developments of an electron cyclotron resonance (ECR) ion source, a radio frequency quadruple (RFQ) linac, an inter digital H (IH) linac, an acceleration system of synchrotron, a beam-delivery system and other key-technology parts have been successfully finished. Thus, in co-operation with NIRS, Gunma University has been constructing a carbon-therapy facility since April, 2006. If the present clinical results are to be improved, it is necessary to create a more accurate dose distribution on tumors without an undesired dose being deposited in normal tissue. Beam-scanning methods with respiration-gated irradiation are especially important to treat a cancer tumor located in the trunk of a patient.
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