An extended table of calculated (n,2n) cross sections

Pearlstein, S.

doi:10.1016/0550-306x(67)80005-3

Cited by 62 publications

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“…Although we measured only cross section for excited iso- 6 We do not include in the Table 7 mer in 117 Sn, it is possible to evaluate the value of σ g cross section for this reaction because semi-empirical formulae predict total (n, 2n) cross sections (σ g = σ tot − σ m ). The predictions of σ tot for the 118 Sn(n, 2n) 117 Sn reaction are (except that of [54]) all between 1330 and 1630 mb [26,52,53,55,58,73,74]. The mean value of total cross section is centered around (1464 ± 104) mb excluding the result of Ref.…”

Section: Sn(n 2n) 117 Sn Reactionmentioning

confidence: 99%

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched¹¹²Sn targets with reference to¹¹¹In productionviaradioisotope generator¹¹²Sn(n, 2n)¹¹¹Sn →¹¹¹In

Běták¹,

Mikołajczak²,

Staniszewska³

et al. 2005

Radiochimica Acta

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Activation cross sections / Ge detector / Neutron-induced reactions / γ -ray spectroscopy / Tin region / Neutron generatorSummary. We measured activation cross sections via γ -ray spectroscopy using high-purity germanium detectors for 16 reactions induced by (14.4 ± 0.2) MeV neutrons on isotopes of tin. The cross sections are: σ( 112 Sn(n, 2n) 111 Sn) = (1104 ± 43) mb, σ( 112 Sn(n, p) 112m In) = (33.6 ± 2.1) mb, σ( 112 Sn(n, p) 112g In) = (42.7 ± 3.1) mb, σ( 114 Sn(n, 2n) 113 Sn) = (1270 ± 115) mb, σ( 114 Sn(n, p) 114m2 In) = (20.5 ± 1.1) mb, σ( 115 Sn(n, p) 115m In) = (35.2 ± 2.6) mb, σ( 116 Sn(n, p) 116m2 In) = (11.1 ± 0.5) mb, σ( 117 Sn(n, n p) 116m2 In) = (1.35 ± 0.11) mb, σ( 117 Sn(n, p) 117m In) = (4.5 ± 0.4) mb, σ( 117 Sn(n, p) 117g In) = (12.8 ± 0.7) mb, σ( 117 Sn(n, n ) 117m Sn) = (246 ± 21) mb, σ( 118 Sn(n, 2n) 117m Sn) = (816 ± 70) mb, σ( 118 Sn(n, α) 115g Cd) = (1.26 ± 0.16) mb, σ( 120 Sn(n, α) 117m Cd) = (0.27 ± 0.04) mb, σ( 120 Sn(n, α) 117g Cd) = (0.29 ± 0.06) mb and σ( 124 Sn(n, 2n) 123m Sn) = (590 ± 26) mb.Two 112 Sn targets enriched to 62.5% and 84%, respectively, were used for these measurements in addition to the natural tin. The cross sections were compared with experimental data found in the literature, with published empirical formulae and with model calculations including also the pre-equilibrium contribution. For reactions which do not involve protons from below the closed Z = 50 shell, the agreement to the data is reasonable, it is somewhat weaker for the (n, p) reactions and still worse in the case of (n, α), where, however, the pre-equilibrium component is not described properly by the models included so far. The possibility of production of 111 Sn → 111 In generator system is considered.

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Section: Sn(n 2n) 117 Sn Reactionmentioning

confidence: 99%

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched¹¹²Sn targets with reference to¹¹¹In productionviaradioisotope generator¹¹²Sn(n, 2n)¹¹¹Sn →¹¹¹In

Běták¹,

Mikołajczak²,

Staniszewska³

et al. 2005

Radiochimica Acta

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“…The global behaviour of the (n, 2n) cross sections calculated using Pearlstein's semiempirical formula [1] and its comparison with experimental data was already discussed in References 2 and 3. In this work we investigate the region UR=6+_I MeV in detail.…”

Section: The Evaporation Calculations For (N 2n) Reactions At Ua =6_mentioning

confidence: 99%

“…The discrepancy of 10-20% between experimental data and evaporation estimates was neither observed as systematic nor considered significant. At the time, most of the evaporation results were obtained by Pearlstein's semiempirical formula [1]. It has been shown recently 1-2, 3] that Pearlstein's calculations give results which are in systematic disagreement with experimental data.…”

Section: Introductionmentioning

confidence: 95%

Investigation of (n, 2n) reactions by the evaporation process

et al. 1979

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The (n, 2n) cross sections for about 80 nuclei ranging from A = 45 to 209 were calculated using the evaporation model. The calculation was performed for incident energies E n which satisfy the condition U R = E,, + Qn, 2n = 6_ 1 MeV. For 11 nuclei in the above mass region, (n, 2n) excitation functions were calculated from threshold to 20MeV. In all calculations a single set of input parameters was consistently used. The influence of the level-density parameter and neutron cross sections on the evaporation model was tested. All calculated results were compared with experimental data. The systematic discrepancy between experimental data and evaporation calculations leads to the necessity of introducing the preequilibrium emission mechanism.

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“…The sum of the neutron-emission cross sections is given by ( 2) where a ne is the reaction or non-elastic cross section, an,p the (n, p) cross section which can be estimated from the pre-equilibrium model and aother the other cross sections including the (n, a), (n, r), (n, d), (n, pn), (n, an) etc. which cannot be calculated in the same for the (n, p) cross section.…”

Section: (N 2n) Cross Sectionmentioning

confidence: 99%

Activation Cross Sections for (n, 2n) Reaction on Neodymium, Samarium, Gadolinium and Ytterbium at 14.6 MeV

Kumabe

KOTAKE

Nagahama

1977

Journal of Nuclear Science and Technology

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Activation cross sections for the (n, 2n) reaction on Nd, Sm, Gd and Yb have been measured at 14.6 MeV by using a Ge(Li) r-ray detector. The following cross sections (mb) have been obtained: 142 Nd 1,675±160, 148 Nd 1,789±147, 150 Nd 1,720±128, 154 Sm 2,010 ±137, 1soGd 2,173±152, 1 7 6Yb 2,226±152. These (n, 2n) cross sections are compared with the theoretical calculations performed by a new model including pre-equilibrium and statistical models. A good agreement between the experimental and calculated cross sections is obtained.

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An extended table of calculated (n,2n) cross sections

Cited by 62 publications

References 0 publications

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched¹¹²Sn targets with reference to¹¹¹In productionviaradioisotope generator¹¹²Sn(n, 2n)¹¹¹Sn →¹¹¹In

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched¹¹²Sn targets with reference to¹¹¹In productionviaradioisotope generator¹¹²Sn(n, 2n)¹¹¹Sn →¹¹¹In

Investigation of (n, 2n) reactions by the evaporation process

Activation Cross Sections for (n, 2n) Reaction on Neodymium, Samarium, Gadolinium and Ytterbium at 14.6 MeV

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An extended table of calculated (n,2n) cross sections

Cited by 62 publications

References 0 publications

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched112Sn targets with reference to111In productionviaradioisotope generator112Sn(n, 2n)111Sn →111In

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched112Sn targets with reference to111In productionviaradioisotope generator112Sn(n, 2n)111Sn →111In

Investigation of (n, 2n) reactions by the evaporation process

Activation Cross Sections for (n, 2n) Reaction on Neodymium, Samarium, Gadolinium and Ytterbium at 14.6 MeV

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Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched¹¹²Sn targets with reference to¹¹¹In productionviaradioisotope generator¹¹²Sn(n, 2n)¹¹¹Sn →¹¹¹In

Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched¹¹²Sn targets with reference to¹¹¹In productionviaradioisotope generator¹¹²Sn(n, 2n)¹¹¹Sn →¹¹¹In