Ta181(p, n)W181 and Au197(p, n)Hg197 excitation functions between 4 and 13 MeV

Hansen, L. F.; Jopson, R. C.; Mark, Hans; Swift, C. D.

doi:10.1016/0029-5582(62)90062-7

Cited by 47 publications

(10 citation statements)

References 10 publications

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“…At low energies, a t 8 Mev and 12 Mev, the cross section for the (p,n) reaction reported here, 60 and 98 millibarns respectively, are comparable t o the values given by Hansen et al (34) for the same reaction, 52 and 90 millibarns a t the corresponding energies. At the highest bolnbarding energy, 84 Mev, the cross-section values for (p,4n), (p,5n), and (9,672) reactions are 64, 98, and 73 millibarns as compared t o the values for these reactions a t 340 Mev by Nervik and Seaborg (j), which are 65, 30, and 65 millibarns.…”

Section: Fig 3 Excitation Function For the Ta181(p3n)w179 Reactionsupporting

confidence: 85%

“…The (~~2 % ) reaction leading to stable W180 has calculated (34) cross-section values of 6 and 400 millibarns a t 8 Mev and 12 Mev respectively. Thus the total reaction cross-section values of 66 millibarns a t 8 Mev and 500 millibarns a t 12 RiIev compare well with the values computed with the optical model using a surface absorption potential (34). T h e proton capture cross sections a t these energies, calculated by Shapiro (32) with R = 1.5X10-13A113, correspond to 60 and 470 millibarns, which also agree with the above total reaction cross-section values, again pointing out that the (p,n) interaction proceeds via the compound nucleus a t these low energies and direct interaction interference is negligible.…”

Section: Fig 3 Excitation Function For the Ta181(p3n)w179 Reactionsupporting

confidence: 69%

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Nuclear Reactions Induced in Tantalum by Protons of Energy Up to 84 Mev

Rao¹,

Yaffe²

1963

Can. J. Chem.

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Kuclear reactions induced in tantalum by protons of energy up to 84 Mev have been studied and excitation functions obtained for products formed by (p,xn), (p,pxn), (p12pxn), and (p,3pxn) reactions. Radiation characteristics of the products were redetermined. Previously unreported ?-rays with energies 90 to 1050 kev have been found for \VI76, and 113 kev for WIi7. A new half-life of 2.7f 0.1 hr for WI76 is reported. The cross sections for the (p,xn) reactions were compared with the values predicted by Jackson's schematic model and found to be in reasonable agreement. More complex reactions are discussed in the light of current nuclear theories.

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Section: Fig 3 Excitation Function For the Ta181(p3n)w179 Reactionsupporting

confidence: 85%

Section: Fig 3 Excitation Function For the Ta181(p3n)w179 Reactionsupporting

confidence: 69%

Nuclear Reactions Induced in Tantalum by Protons of Energy Up to 84 Mev

Rao¹,

Yaffe²

1963

Can. J. Chem.

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“…As mentioned above, this ratio was measured earlier by several groups [17][18][19][20][21], and the results above 10 MeV are conflicting. A detailed analysis shows that in some cases the true coincidence corrections were omitted in the evaluation of the experimental data and that the authors used a small distance between the detector and the sample.…”

Section: B Isomeric Cross-section Ratiosmentioning

confidence: 89%

“…Based on the isomeric cross-section ratio, the spin-cutoff parameter (σ ) was determined, and the ratio of the effective moment of inertia eff to the rigid-body moment of inertia rig (η = eff / rig ) was found to be about 0.1, which is in disagreement with its usual value of 0.5. Some later measurements [18,19,21] gave higher isomeric cross-section ratios for the 197 Au(p, n) 197 Hg m,g process. For the other nuclear processes studied in this work, no cross-section data were found in the literature.…”

Section: Introductionmentioning

confidence: 97%

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Cross sections for the formation ofHg195m,g,
Sudár
¹
,
Qaim
²

2006
Phys. Rev. C

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Excitation functions were measured for the reactions nat Pt( 3 He, xn) 195 Hg m,g , nat Pt( 3 He, xn) 197 Hg m,g , nat Pt( 3 He, x) 196 Au m,g , and nat Pt(α, xn) 197 Hg m,g over the energy range of 18-35 MeV for 3 He particles and 17-26 MeV for α particles. The reactions 197 Au(p, n) 197 Hg m,g were also investigated over the proton energy range of 6-20 MeV. The three projectiles were produced at the Jülich variable-energy compact cyclotron (CV 28). Use was made of the activation technique in combination with conventional high-resolution as well as low-energy HPGe-detector γ -ray spectroscopy. For most of the reactions, the present measurements provide the first consistent sets of data. From the available experimental data, isomeric cross-section ratios were determined for the above-mentioned reactions. Nuclear model calculations using the code STAPRE, which employs the Hauser-Feshbach (statistical model) and exciton model (precompound effects) formalisms, were undertaken to describe the formation of both the isomeric and the ground states of the products. The calculations were compared with the results of the EMPIRE-II code. The excitation functions of the ( 3 He, xn) and (α, xn) processes are described well by the theory. In the case of ( 3 He, pxn) reactions, however, considerable deviations were observed between the experiment and the theory, presumably due to strong contributions from direct interactions. A description of the isomeric cross-section ratio by the model was possible only with a very low value of η, i.e., the eff / rig ratio. A mass dependence of η is proposed.

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