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35Cl(n, X) Cross Section Measurement
35Cl(n, X) Cross Section Measurement
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151024
- ISBN
- 9798384451709
- DDC
- 539.76
- 서명/저자
- 35Cl(n, X) Cross Section Measurement
- 발행사항
- [Sl] : University of California, Berkeley, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 94 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Bernstein, Lee.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Berkeley, 2024.
- 초록/해제
- 요약Neutron induced reactions on Chlorine, especially 35Cl, have wide relevance across the nuclear science spectrum. The 35Cl(n, p0) 35S channel is particularly vital to the design of Molten Chloride Fast Reactors (MCFR) as it impacts core reactivity through neutron loss in the Chlorine based carrier salt. However, until 2019, very little experimental data existed for the relevant energy range. Secondary γ-ray production data for the 35Cl(n, p) 35S reaction are also needed for national security applications, including active neutron interrogation, yet there is currently no useful experimental data available. Gamma-ray data is also used in space exploration for detecting the isotopic makeup of extraterrestrial environments as well as in oil-well logging. To address these nuclear data needs, measurements of the 35Cl(n,x) reaction cross sections were conducted at Lawrence Berkeley National Laboratory's (LBNL) 88-inch cyclotron.The nuclear data evaluation process that produces the cross sections used for applications assumes a fixed total (n,x) cross section. The result is that an increase in one channel causes a corresponding decrease in one or more other evaluated channel(s). To address this aspect of nuclear data evaluation we performed a multi-component experiment whose goal was to measure all energetically possible reaction channels instead of using the more common single channel approach. The experiment consisted of three independent parts. First, the energy differential 35Cl(n, p0) 35S cross section was obtained using a CLYC detector as an active target. Second, energy-differential γ-ray production data for 35Cl(n, pγ) 35S and 35Cl(n, n'γ) 35Cl were obtained using the GENESIS array. This data was compared against (elsewhere produced) CoH3 theoretical calculations to inform model predictions as to the relative strength of available reaction channels. Finally, energy-integral 35Cl(n,p) and 35Cl(n,α) cross sections from activation were compared against CoH3. These allow verification of the inelastic channel strength obtained from the γ-ray data as well as determining the total 35Cl(n,α) channel strength which was not available from the other methods.Our results identify a ∼50% reduction in the magnitude of the 35Cl(n, p0) 35S cross section compared to the ENDF/B-VIII.0 evaluation. This result is consistent with a 2020 measurement by Kuvin et. al. Comparison of the γ-ray production data to CoH3 model calculations suggest that the elastic and/or inelastic channels must increase to compensate for the reduction observed in the (n, p0) channel.
- 일반주제명
- Nuclear engineering
- 일반주제명
- Nuclear physics
- 일반주제명
- Energy
- 일반주제명
- Inorganic chemistry
- 일반주제명
- Nuclear chemistry
- 일반주제명
- Computational physics
- 키워드
- Gamma-ray data
- 키워드
- Chlorine
- 기타저자
- University of California, Berkeley Nuclear Engineering
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151024
■006m o d
■007cr#unu||||||||
■020 ▼a9798384451709
■035 ▼a(MiAaPQ)AAI30996749
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a539.76
■1001 ▼aNagel, Tyler Scott.
■24510▼a35Cl(n, X) Cross Section Measurement
■260 ▼a[Sl]▼bUniversity of California, Berkeley▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a94 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Bernstein, Lee.
■5021 ▼aThesis (Ph.D.)--University of California, Berkeley, 2024.
■520 ▼aNeutron induced reactions on Chlorine, especially 35Cl, have wide relevance across the nuclear science spectrum. The 35Cl(n, p0) 35S channel is particularly vital to the design of Molten Chloride Fast Reactors (MCFR) as it impacts core reactivity through neutron loss in the Chlorine based carrier salt. However, until 2019, very little experimental data existed for the relevant energy range. Secondary γ-ray production data for the 35Cl(n, p) 35S reaction are also needed for national security applications, including active neutron interrogation, yet there is currently no useful experimental data available. Gamma-ray data is also used in space exploration for detecting the isotopic makeup of extraterrestrial environments as well as in oil-well logging. To address these nuclear data needs, measurements of the 35Cl(n,x) reaction cross sections were conducted at Lawrence Berkeley National Laboratory's (LBNL) 88-inch cyclotron.The nuclear data evaluation process that produces the cross sections used for applications assumes a fixed total (n,x) cross section. The result is that an increase in one channel causes a corresponding decrease in one or more other evaluated channel(s). To address this aspect of nuclear data evaluation we performed a multi-component experiment whose goal was to measure all energetically possible reaction channels instead of using the more common single channel approach. The experiment consisted of three independent parts. First, the energy differential 35Cl(n, p0) 35S cross section was obtained using a CLYC detector as an active target. Second, energy-differential γ-ray production data for 35Cl(n, pγ) 35S and 35Cl(n, n'γ) 35Cl were obtained using the GENESIS array. This data was compared against (elsewhere produced) CoH3 theoretical calculations to inform model predictions as to the relative strength of available reaction channels. Finally, energy-integral 35Cl(n,p) and 35Cl(n,α) cross sections from activation were compared against CoH3. These allow verification of the inelastic channel strength obtained from the γ-ray data as well as determining the total 35Cl(n,α) channel strength which was not available from the other methods.Our results identify a ∼50% reduction in the magnitude of the 35Cl(n, p0) 35S cross section compared to the ENDF/B-VIII.0 evaluation. This result is consistent with a 2020 measurement by Kuvin et. al. Comparison of the γ-ray production data to CoH3 model calculations suggest that the elastic and/or inelastic channels must increase to compensate for the reduction observed in the (n, p0) channel.
■590 ▼aSchool code: 0028.
■650 4▼aNuclear engineering
■650 4▼aNuclear physics
■650 4▼aEnergy
■650 4▼aInorganic chemistry
■650 4▼aNuclear chemistry
■650 4▼aComputational physics
■653 ▼aMolten Chloride Fast Reactors
■653 ▼aGamma-ray data
■653 ▼aNeutron induced reactions
■653 ▼aChlorine
■653 ▼aInelastic channels
■690 ▼a0552
■690 ▼a0488
■690 ▼a0756
■690 ▼a0216
■690 ▼a0738
■690 ▼a0791
■71020▼aUniversity of California, Berkeley▼bNuclear Engineering.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0028
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160466▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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