FACULTY OF PHYSICS & ENGINEERING PHYSICS

DEPARTMENT OF NUCLEAR PHYSICS - NUCLEAR ENGINEERING - MEDICAL PHYSICS

Investigation of the ground-state spin inversion in the neutron-rich 47,49 Cl isotopes

B. D. Linh, N.T.T.Phuc et al.
Phys. Rev. C 104, 044331

Abstract:

A first γ-ray study of 47,49Cl spectroscopy was performed at the Radioactive Isotope Beam Factory with 50Ar projectiles at 217 MeV/nucleon, impinging on the liquid hydrogen target of the MINOS device. Prompt deexcitation γ rays were measured with the NaI(Tl) array DALI2+. Through the one-proton knockout reaction 50Ar(p,2p), a spin assignment could be determined for the low-lying states of 49Cl from the momentum distribution obtained with the SAMURAI spectrometer. A spin-parity Jπ=3/2+ is deduced for the ground state of 49Cl, similar to the recently studied N=32 isotope 51K. The evolution of the energy difference E(1/21+)E(3/21+) is compared to state-of-the-art theoretical predictions.

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Investigation of the effects of chemotherapy on trace element contents in the nails in patients with colorectal cancer

Phuong Truc Huynh, Binh Thanh Dinh, Linh Thi Truc Nguyen, Loan Thi Hong Truong, Hanh Van Nguyen, Dung Manh Ho, Dong Van Nguyen, Anh Tuan Tran

Journal of Radioanalytical and Nuclear Chemistry (2021) 328:1173–1180

Abstract:

The aim of this study was to evaluate the effects of cancer treatment with chemotherapy for the trace elements in nails of patients with colorectal cancer. The contents of trace elements in the nails of 102 patients with colorectal cancer (including treated and untreated) and 60 healthy subjects were analyzed using k0-standardization method of neutron activation analysis. All participants aged between 32 and 76. Result of this study showed that the contents of nine trace elements (As, Br, Co, Cr, Hg, Fe, Sc, Se, and Zn) in the nails were measured. Furthermore, this study showed that there was significant difference in the contents of the elements Fe, Se, and Zn in both colon and rectal cancer patient groups between untreated and treated subjects with chemotherapy. We conclude that the contents of Fe, Se, and Zn in the nail samples may be used to evaluate of the colorectal cancer risk, and they may be affected by chemotherapy.

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Investigation of prompt 𝛾-ray neutron activation spectrometer at the Dalat research reactor using Geant4 simulation

Chau Thanh Tai, Tran Thien Thanh, Pham Ngoc Son, Chau Van Tao

Radiation Physics and Chemistry 208 (2023) 110884

Abstract:

The prompt 𝛾-ray activation analysis (PGAA) detector, which has been developed at the Dalat nuclear research reactor, is investigated in this study. The Geant4 model is proposed for the PGAA detector to evaluate the Compton scattering background suppression. Based on this model, the detector efficiency in the energy range from 0.1 MeV to 11 MeV was determined using the thermal neutron capture of chlorine, titanium, nitrogen, and reference sources. The detector efficiencies in the unsuppressed and suppressed modes and the difference of efficiencies in both modes were calculated. Additionally, the suppression of additional peaks of the PGAA detector was also estimated in this work. Finally, the polynomial function for the detector efficiency and the ratio of additional peaks to corresponding full-energy peaks were determined. This work makes an essential contribution to the analysis of prompt 𝛾-ray spectrum acquired from the PGAA detector at the Dalat nuclear research reactor.

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Influences of Soil and Plant Types on The Mitigation Rateof Radium‑226 in The Cultivated Soils

Van Thang Nguyen, Nguyen Phong Thu Huynh,  Cong Hao Le

Water Air Soil Pollut (2024) 235:95

Abstract

The effects of fertilizers, irrigation water, and air dust pollution on the long-term accumulation of radionuclides in surface soils have been investigated worldwide. In addition, many factors cause the removal of radionuclides from the soil. The removal rate is difficult to estimate because it is controlled by several parameters such as agricultural practices and soil properties. In this study, the mitigation rate of Ra-226 in the topsoil of agricultural soils in 20 fields in Vietnam was measured. The rate was considered two main processes that rejected radionuclides from the topsoil. Moreover, the soil-to-plant transfer factors (TF) and solid/liquid partition coefficients (Kd) for these soils have been reported. It was found that the obtained values of TF and Kd were wide and depended on the plant and soil types. The new experimental method gives the leaching rate of Ra-226 matching that based on the models, except for the rice paddy soil. For twenty considered soils, the mitigation rates of Ra-226 were from 0.1 to 0.58 Bq kg−2 y−1. The trend of Ra-226 mitigation correlated with the uptake ability of the plant (TF) and the Ra-226 concentration in pore water (Kd).

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Truong Thi Hong Loan, Vu Ngoc Ba, Dang Thi Thuy Dan, Vuong Minh Tri, Huynh Thi Yen Hong, Truong Huu Ngan Thy, Nguyen Thi Truc Linh, Le Cong Hao & Huynh Truc Phuong 

Journal of Radioanalytical and Nuclear Chemistry 327, 609-616(2021)

Abstract:

In this work, the impacts of TENORM (Technologically Enhanced Naturally Occurring Radioactive Materials) from fertilizers on soil and vegetables were estimated. We investigated both the activity concentration of the natural radionuclides and the annual effective dose rate due to the ingestion of vegetables in the crops using fertilizers at the agricultural zone of Hoc Mon, Ho Chi Minh City, Vietnam. The results show that there have not yet been signs of radioactive residues from using conventional fertilizers in agricultural land after a crop at the surveyed area and time. The radiological impact of surveyed vegetables was negligible to the public health.

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Nguyen Le Anh , Nguyen Hoang Phuc , Dao T. Khoa , Le Hoang Chien , Nguyen Tri Toan Phuc

Nuclear Physics A 1006 (2021) 122078

Abstract:

The proton radiative capture 12,13C(p, γ ) reactions at astrophysical energies, key processes in the CNO cycle, are revisited in the potential model with the proton-nucleus potential for both the scattering and bound states obtained in the folding model, using a realistic density dependent nucleon-nucleon interaction. For the consistency, this same folding model is also used to calculate the optical potential of the elastic p+12,13C scattering at energies around the Coulomb barrier. The folded p+12,13C optical potentials are shown to account well for both the elastic p+12,13C scattering and astrophysical S factors of the radiative capture 12,13C(p, γ ) reactions.

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