New calculation method of neutron kerma coefficients for carbon and oxygen below 30 MeV

Sun, Xiaojun; Qu, Wenjing; Duan, Junfeng; Zhang, Jingshang

doi:10.1103/physrevc.78.054610

Cited by 15 publications

(12 citation statements)

References 35 publications

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“…On the one hand, it may be interpreted that the Negele's nuclear density [52] adopted to calculate the nucleon MOP [1,13,14,15] is not suitable for light nuclei. On the other hand, light nucleus, such as 16 O, has its unique structure characteristics and reaction mechanism [53,54], which may also lead to the discrepancy between the MOP results and measured values.…”

Section: Calculated Results and Analysismentioning

confidence: 99%

Microscopic study of the $^{7}$Li-nucleus potential

Chen,

Guo,

Sun

et al. 2020

Preprint

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The optical potential without any free parameters for 7 Li-nucleus interaction system is studied in a microscopic approach. It is obtained by folding the microscopic optical potentials of the constituent nucleons of 7 Li over their density distributions. We employ an isospin-dependent nucleon microscopic optical potential, which is based on the Skyrme nucleon-nucleon effective interaction and derived by using the Green's function method, to be the nucleon optical potential. Harmonic oscillator shell model is used to describe the internal wave function of 7 Li and get the nucleon density distribution. The 7 Li microscopic optical potential is used to predict the reaction cross sections and elastic scattering angular distributions for target range from 27 Al to 208 Pb and energy range below 450 MeV. Generally the results can reproduce the measured data reasonably well. In addition, the microscopic optical potential is comparable to a global phenomenological optical potential in fitting the presently existing measured data generally.

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Section: Calculated Results and Analysismentioning

confidence: 99%

Microscopic study of the $^{7}$Li-nucleus potential

Chen,

Guo,

Sun

et al. 2020

Preprint

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“…where m 0 is the mass of the neutron, M 1 is the mass of the residual nucleus, M 0 is the mass of the compound nucleus, E n is the kinetic energy of the incident neutron, σ el is the elastic cross section and f m 1 1 is the first Legendre coefficient of elastic angular distribution [32]. This first Legendre coefficient represents the cosine of the mean angle between the recoil and the direction of the incident neutron.…”

Section: Declaration Of Competing Interestmentioning

confidence: 99%

On the Eptihermal Neutron Energy Limit for Accelerator-Based Boron Neutron Capture Therapy (AB-BNCT): Study and Impact of New Energy Limits

Hervé¹,

Sauzet²,

Santos³

2021

Preprint

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Background and purpose: Accelerator-Based Boron Neutron Capture Therapy is a radiotherapy based on compact accelerator neutron sources requiring an epithermal neutron field for tumour irradiations. Neutrons of 10 keV are considered as the maximum optimised energy to treat deep-seated tumours. We investigated, by means of Monte Carlo simulations, the epithermal range from 10 eV to 10 keV in order to optimise the maximum epithermal neutron energy as a function of the tumour depth.Methods: A Snyder head phantom was simulated and mono-energetic neutrons with 4 different incident energies were used: 10 eV, 100 eV, 1 keV and 10 keV. 10 B capture rates and absorbed dose composition on every tissue were calculated to describe and compare the effects of lowering the maximum epithermal energy. The Therapeutic Gain (TG) was estimated considering the whole brain volume.Results: For tumours seated at 4 cm depth, 10 eV, 100 eV and 1 keV neutrons provided respectively 54 %, 36 % and 18 % increase on the TG compared to 10 keV neutrons. Neutrons with energies between 10 eV and 1 keV provided higher TG than 10 keV neutrons for tumours seated up to 6.4 cm depth inside the head. The size of the tumour does not change these results.Conclusions: Using lower epithermal energy neutrons for AB-BNCT tumour irradiation could improve treatment efficacy, delivering more therapeutic dose while reducing the dose in healthy tissues. This could lead to new Beam Shape Assembly designs in order to optimise the BNCT irradiation.

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“…(p, γ) 10 B, Q = +6.586MeV, E th = 0.000MeV (p, n) 9 B, Q = −1.850MeV, E th = 2.067MeV (p, p) 9 Be, Q = 0.000MeV, E th = 0.000MeV (p, α) 6 Li, Q = +2.127MeV, E th = 0.000MeV (p, 3 He) 7 Li, Q = −11.202MeV, E th = 12.455MeV (p, d) 8 Be, Q = +0.559MeV, E th = 0.000MeV (p, 5 He) 5…”

Section: A Analysis Of the Reaction Channelsmentioning

confidence: 99%

Statistical theory of light-nucleus reactions and application to theBe9(p,xn)reaction

Sun

Zhang

2016

Phys. Rev. C

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A statistical theory of light nucleus reaction (STLN) is proposed to describe both neutron and light charged particle induced nuclear reactions with 1p-shell light nuclei involved. The dynamic of STLN is described by the unified Hauser-Feshbach and exciton model, of which the angular momentum and parity conservations are considered in equilibrium and pre-equilibrium processes.The Coulomb barriers of the incident and outgoing charged particles, which seriously influence the open reaction channels, could be reasonably considered in the incident channel and the different outgoing channels. In kinematics, the recoiling effects in various emission processes are taken strictly into account. Taking 9 Be(p, xn) reaction as an example, we calculate the double-differential cross sections of outgoing neutrons and charged particles using PUNF code in the frame of STLN.The calculated results agree very well with the existing experimental neutron double-differential cross sections at E p = 18 MeV, and indicate that PUNF code is a powerful tool to set up file-6 in the reaction data library for the light charged particle induced nuclear reactions with 1p-shell light nuclei involved.

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New calculation method of neutron kerma coefficients for carbon and oxygen below 30 MeV

Cited by 15 publications

References 35 publications

Microscopic study of the $^{7}$Li-nucleus potential

Microscopic study of the $^{7}$Li-nucleus potential

On the Eptihermal Neutron Energy Limit for Accelerator-Based Boron Neutron Capture Therapy (AB-BNCT): Study and Impact of New Energy Limits

Statistical theory of light-nucleus reactions and application to theBe9(p,xn)reaction

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