Application of the Calculable R-matrix to Study the 12, 13C(p,γ)13, 14N Reaction
Nguyen Hoang Phuc, Nguyen Tri Toan Phuc, Do Cong Cuong
Few-Body Systems (2026) 67:15
Abstract
We apply the calculable R-matrix method to determine the cross sections of the 12, 13C(p, γ)13, 14N reactions using both local Woods-Saxon (WS) and nonlocal Perey-Buck (PB) potentials. Benchmark calculations are first performed for the 12C(p, γ)13N reaction, and the results show good agreement with the standard codes FRESCO and RADCAP, as well as with recent calculations in other works. Furthermore, the method is applied to investigate the 13C(p, γ)14N reaction. Analysis of the astrophysical S-factors for both reactions indicates no significant difference between the local and nonlocal potential calculations, with discrepancies limited to approximately 7%–8%. The successful application of the calculable R-matrix method to these (p, γ) processes provides a framework for future studies involving nonlocal potentials derived from microscopic models.
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Phuong Truc Huynh, Trinh Pham Ngoc Tran, Binh Thanh Dinh, Linh Thi Truc Nguyen, Loan Thi Hong Truong, Anh Tuan Tran, Dung Manh Ho, Dong Van Nguyen
Journal of Radioanalytical and Nuclear Chemistry (2020) 324:663–671
Abstract:
The aim of this study was to nd trace elements that increase risk of breast cancer based on the deviation of the concentra- tion of trace elements in the ngernail collected from the women with breast cancer and the normal women. The study was conducted with 10 elements (As, Au, Br, Co, Cr, Fe, Sb, Sc, Se, and Zn) using k0-INAA and statistical analysis method. Signi cant di erences (P < 0.05) were found for Cr, Fe, Sc and Zn between the case and the control groups. A signi cant correlation between Fe and Zn has found for the normal women, but this disappears in the women with breast cancer. On the contrary, a signi cant correlation between As and Cr has found in the case group, but no such correlation has noticed for the control group. The elements Cr, Fe, and Zn may be associated to the risk of breast cancer.
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Analysis of the soil to food crops transfer factor and risk assessment of multi-elements at the suburban area of Ho Chi Minh city, Vietnam using instrumental neutron activation analysis (INAA)
Bui Ngoc Thien, Vu Ngoc Ba, Mai Thanh Man, Truong Thi Hong Loan
Journal of Environmental Management 291 (2021) 112637
Abstract:
The contamination of heavy metals in agricultural ecosystem is one of the most important problems in devel- oping countries as Vietnam. In this study, we investigated the multi-element concentrations in soil, vegetables, soil-to-plant transfer factors and target hazard quotient (THQ) due to the consumption of heavy metals in Ho Chi Minh City, Vietnam. In general, the element concentrations in soil and plants were similar to different studies in the world and in the range of allowable values provided by WHO and the Ministry of Health of Vietnam. The transfer factors indicated the in uence of element characteristics and plant genotypes on the accumulation and translocation of elements from soil to plants. It is found that I. batatas, B. alba, A, tricolor, O. basilicum, and B. juncea could be potential candidates for phytoremediation in soil contaminated of heavy metals. The results of individual and total THQ were below unity for Cr, Mn, Fe, Co, Zn, As, and Sb. The total THQ is in the range from 0.11 for R. sativus to 0.84 for B. alba with the average value of 0.43, in which Mn and As are the major con- tributions to the total THQ with the average values of 75% and 18%, respectively. The safety assessment based on national regulations and THQ indicated that the consumption of investigated vegetables poses no risk to the consumers.
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Analysis of the 16C(d,p)17C reaction from microscopic 17C wave functions
Le Hoang Chien and P. Descouvemont
Physical Review C (2023) 108, 044605
Abstract:
| We present a semimicroscopic study of the 16C(d,p)17C transfer reaction. The 17C overlap integrals and spectroscopic factors are obtained from a microscopic cluster model, involving many 16C+n configurations. This microscopic model provides a fair description of the 17C bound-state energies. The 16C+d scattering wave functions are defined in the continuum discretized coupled channel (CDCC) method, where the deuteron breakup is simulated by pseudostates. The transfer cross sections are in good agreement with recent data. We confirm the 16C(2+)+n structure of the ground state, and show that deuteron breakup effects have a significant influence on the cross sections. We study the 17C(p,d)16C reverse reaction and suggest that the cross section to the 2+ state should be large. A measurement of the ground-state cross section would provide a strong test of the microscopic wave functions. |
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An improved semi-empirical procedure for Compton scattering technique applied to measure pipeline thickness
Vo Hoang Nguyen, Nguyen Huu Bao, Huynh Dinh Chuong, Nguyen Duy Thong, Tran Thien Thanh & Chau Van Tao
Journal of Radioanalytical and Nuclear Chemistry (2021)
Abstract:
This study aims to formulate semi-empirical processing applied to analyze simulated and experimental scattering spectra on pipeline samples for estimating the intensity of the single scattering component for the Compton scattering technique. Firstly, a procedure has been developed based on probability density functions of each scattering component, which are obtained by GEANT4. Secondly, sixteen targets are simulated with MCNP6 to validate the proposed procedure. It is shown that the relative deviation for all samples is under 3%. Thirdly, the nine calculated thickness of pipeline samples is determined with a maximum relative deviation lower than 5% in comparing to calibration thickness.
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An Assessment of External Dose From Natural Radioactivity in Building Materials by Using Simulation Monte Carlo
Le Quang Vuong, Tran Thi Bao Ngoc, Le Thi Ai Van, Tran Thien Thanh, Chau Van Tao
IEEE TRANSACTIONS ON NUCLEAR SCIENCE, VOL. 72, NO. 4, APRIL 2025
Abstract:
Aside from the natural background ionizing radiation that humans are constantly exposed to, there is a significant risk of elevated radiation levels from building materials with enhanced radioactivity. Given the time individuals spend indoors, this study is crucial in assessing the external radiation dose from commonly used construction materials. A room model with dimensions of
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