Photo-neutron reaction cross-sections for natZr in the bremsstrahlung end-point energies of 12-16 and 45-70 MeV

Naik, H.; Lee, M.W.; Cho, M.-H.; Goswami, A.; John, R.; Kim, K.; Gey, Y.; Massarczyk, R.; Zaman, Muhammad; Junghans, A. R.; Yang, Sung-Chul; Kim, G.N.; Wagner, A.; Schwengner, R.; Shin, Seung Gu

doi:10.1140/epja/i2014-14083-0

Cited by 17 publications

(4 citation statements)

References 28 publications

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“…Variation of the photon energy could cause the formation of other radionuclides as impurities from the isotopes of zirconium and thus the shielding would have to be designed accordingly. The reaction crosssections of nat Zr at different bremsstrahlung end-point energieshas been studied by Naik et al [45]. From their work, the presence of 89 Zr and 95 Zr from the 90 Zr(c, n) and 96 Zr(c, n) reactions are expected in the bremsstrahlung endpoint energies of 15 and 10 MeV.…”

Section: Resultsmentioning

confidence: 99%

Preparation of 99Mo from the 100Mo(γ, n) reaction and chemical separation of 99mTc

Gopalakrishna¹,

Naik

Suryanarayana

et al. 2015

J Radioanal Nucl Chem

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The radionuclide 99 Mo has been prepared by 100 Mo(c, n) reaction using two types of natural molybdenum compound (molybdenum trioxide and zirconium molybdate gel) with the bremsstrahlung end-point energies of 10 and 15 MeV. After the equilibrium, 99m Tc was separated as NaTcO 4 from the irradiated samples using two different chemical procedures to examine the chemical yield. The separated Na[ 99m Tc]TcO 4 from the ZrMo gel has the 99Mo breakthrough of \10 -4 %, radiochemical purity[99 % as well as chemical impurities of Al, Mo and Zr \ 10 ppm. The estimation of 99 Mo and 99m Tc was done by using off-line c-ray spectrometric technique. The chemical yield of the separated 99m Tc from the dissolved molybdenum trioxide is 70.7-75.2 %, whereas in the undissolved zirconium molybdate gel, it is 19.1-43 %. The second method is preferable because it is user friendly in hospital radiopharmacy throughout the shelf-life.Keywords Medical isotope 99 Mo-9m Tc Á 100 Mo(c,n) reaction Á Molybdenum trioxide Á Zirconium molybdate gel Á Off-line c-ray spectrometric technique Á Chemical yield

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Section: Resultsmentioning

confidence: 99%

Preparation of 99Mo from the 100Mo(γ, n) reaction and chemical separation of 99mTc

Gopalakrishna¹,

Naik

Suryanarayana

et al. 2015

J Radioanal Nucl Chem

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“…These data for the reverse reaction were measured with high precision using monochromatic photons from Laser-Compton scattering. Later average cross sections (Crasta et al 2014;Naik et al 2014) from bremsstrahlung are in rough agreement with the monochromatic photon data; because of their larger uncertainties, the bremsstrahlung data were not included in the present χ 2 -based adjustment of the TALYS parameters.…”

Section: Theoretical Excitation Functionmentioning

confidence: 97%

The ⁹⁵Zr(n, γ)⁹⁶Zr Cross Section from the Surrogate Ratio Method and Its Effect on s-process Nucleosynthesis

Yan

Wang

et al. 2017

ApJ

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The 95 Zr(n,γ) 96 Zr reaction cross section is crucial in the modelling of s-process nucleosynthesis in asymptotic giant branch stars because it controls the operation of the branching point at the unstable 95 Zr and the subsequent production of 96 Zr. We have carried out the measurement of the 94 Zr( 18 O, 16 O) and 90 Zr( 18 O, 16 O) reactions and obtained the γ-decay probability ratio of 96 Zr* and 92 Zr* to determine the 95 Zr(n,γ) 96 Zr reaction cross sections with the surrogate ratio method. Our deduced maxwellian-averaged cross section of 66±16 mb at 30 keV is close to the value recommended by Bao et al. (2000), but 30% and more than a factor of two larger than the values proposed by Toukan & Käppeler (1990) and Lugaro et al. (2014), respectively, and routinely used in s-process models. We tested the new rate in stellar models with masses between 2 and 6 M ⊙ and metallicities 0.014 and 0.03. The largest changes -up 80% variations in 96 Zr -are seen in models of mass 3-4 M ⊙ , where the 22 Ne neutron source is mildly activated. The new rate can still provide a match to data from meteoritic stardust silicon carbide grains, provided the maximum mass of the parent stars is below 4 M ⊙ , for a metallicity of 0.03.

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“…The integrated photon flux from the threshold to the electron beam energy was measured using the photo-peak activity of a 355.68 keV (Iγ =87%) γline of 196g Au produced from the 197 Au(γ, n) 196g Au monitor reaction. The observed number of counts ( ) for the 355.68 keV γ-line of 196g Au was calculated by summing the counts under the full energy peak and subtracting the linear Compton back-ground, which is related to the integrated photon flux as follows [24]:…”

Section: A Determination Of Photon Fluxmentioning

confidence: 99%

“…is the known average cross section of the 197 Au(γ,n) 196g Au monitor reaction taken from Ref. [24], which is 103.3±12.1 mb and 102.4±9.5 mb for the bremsstrahlung end-point energies of 50 and 60 MeV, respectively. Nuclear data, such as the half-lives, γ-ray abundances, reaction Q-values, and threshold energies of the products, are given in Table 1 [21,22].…”

Section: A Determination Of Photon Fluxmentioning

confidence: 99%

Measurements of ^natCd(γ, x) reaction cross sections and isomer ratio of ^115m,gCd with the bremsstrahlung end-point energies of 50 and 60 MeV *

et al. 2021

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The flux-weighted average cross sections of natCd(γ, xn)115g,m,111m,109,107,105,104Cd and natCd(γ, x)113g,112,111g,110mAg reactions were measured at the bremsstrahlung end-point energies of 50 and 60 MeV. The activation and off-line γ-ray spectrometric technique was carried out using the 100 MeV electron linear accelerator at the Pohang Accelerator Laboratory, Korea. The natCd(γ, xn) reaction cross sections as a function of photon energy were theoretically calculated using the TALYS-1.95 and the EMPIRE-3.2 Malta codes. Then, the flux-weighted average cross sections were obtained from the theoretical values of mono-energetic photons. These values were compared with the flux-weighted values from the present study and were found to be in general agreement. The measured experimental reaction cross-sections and integral yields were described for cadmium and silver isotopes in the natCd(γ, xn)115g,m,111m,109,107,105,104Cd and natCd(γ, x)113g,112,111g,110mAg reactions. The isomeric yield ratio (IR) of 115g,mCd in the natCd(γ, xn) reaction was determined for the two bremsstrahlung end-point energies. The measured isomeric yield ratios of 115g,mCd in the natCd(γ, xn) reaction were also compared with the theoretical values of the nuclear model codes and previously published literature data of the 116Cd(γ, n) and 116Cd(n, 2n) reactions. It was found that the IR value increases with increasing projectile energy, which demonstrates the characteristic of excitation energy. However, the higher IR value of 115g,mCd in the 116Cd(n, 2n) reaction compared to that in the 116Cd(γ, n) reaction indicates the role of compound nuclear spin alongside excitation energy.

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Photo-neutron reaction cross-sections for natZr in the bremsstrahlung end-point energies of 12-16 and 45-70 MeV

Cited by 17 publications

References 28 publications

Preparation of 99Mo from the 100Mo(γ, n) reaction and chemical separation of 99mTc

Preparation of 99Mo from the 100Mo(γ, n) reaction and chemical separation of 99mTc

The ⁹⁵Zr(n, γ)⁹⁶Zr Cross Section from the Surrogate Ratio Method and Its Effect on s-process Nucleosynthesis

Measurements of ^natCd(γ, x) reaction cross sections and isomer ratio of ^115m,gCd with the bremsstrahlung end-point energies of 50 and 60 MeV *

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Photo-neutron reaction cross-sections for natZr in the bremsstrahlung end-point energies of 12-16 and 45-70 MeV

Cited by 17 publications

References 28 publications

Preparation of 99Mo from the 100Mo(γ, n) reaction and chemical separation of 99mTc

Preparation of 99Mo from the 100Mo(γ, n) reaction and chemical separation of 99mTc

The 95Zr(n, γ)96Zr Cross Section from the Surrogate Ratio Method and Its Effect on s-process Nucleosynthesis

Measurements of natCd(γ, x) reaction cross sections and isomer ratio of 115m,gCd with the bremsstrahlung end-point energies of 50 and 60 MeV *

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The ⁹⁵Zr(n, γ)⁹⁶Zr Cross Section from the Surrogate Ratio Method and Its Effect on s-process Nucleosynthesis

Measurements of ^natCd(γ, x) reaction cross sections and isomer ratio of ^115m,gCd with the bremsstrahlung end-point energies of 50 and 60 MeV *