Mass distribution in the quasi-mono-energetic neutron-induced fission of 238U

Naik, H.; Mulik, V. K.; Prajapati, P. M.; Shivasankar, B.S.; Suryanarayana, S. V.; Jagadeesan, K. C.; Thakare, S. V.; Sharma, Sanjeev; Goswami, A.

doi:10.1016/j.nuclphysa.2013.05.017

Cited by 23 publications

(13 citation statements)

References 59 publications

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“…Generally, the agreement between the experimental data and the mode calculations mentioned above is good for 238 U but worse for 232 Th at intermediate energies [3,6,7]. It can be obviously seen from the experimental data [3,6,7,13,14] that the pre-neutron-emission mass distributions for reaction 232 Th(n, f) gradually change from double-humped to triple-humped shape with increasing the incident energies. In this work, we attempt to describe quantitatively both the double-humped and triple-humped pre-neutron-emission mass distributions for reaction 232 Th(n, f) up to 60 MeV with an empirical fission potential.…”

Section: Introductionmentioning

confidence: 72%

Pre-neutron-emission Mass Distributions for Reaction ²³² Th( n, f ) up to 60 MeV

Xiao-Jun

Pan

et al. 2014

Commun. Theor. Phys.

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The pre-neutron-emission mass distributions for reaction 232 Th(n, f) up to 60 MeV are systematically studied with an empirical fission potential model. The energy dependences of the peaks and valleys of the preneutron-emission mass distributions are described by the exponential expressions based on the newly measured data. The energy dependence of evaporation neutrons before scission, which plays a crucial role for the reasonable description of the mass distribution, is also considered. Both the double-humped and triple-humped shape of the measured preneutron-emission mass distributions for reaction 232 Th(n, f) are reasonably well reproduced at incident energies up to 60 MeV. The mass distributions at unmeasured energies and the critical energies at which the humped pre-neutron-emission mass distributions are transformed into each other are also predicted.

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Section: Introductionmentioning

confidence: 72%

Pre-neutron-emission Mass Distributions for Reaction ²³² Th( n, f ) up to 60 MeV

Xiao-Jun

Pan

et al. 2014

Commun. Theor. Phys.

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“…From the A L , A H and compound nucleus mass (A C = 239), the experimental average numbers of neutrons ( υ expt ) were calculated according to the following relation: The obtained v expt values from the present work and literature data in the 238 U(n, f ) reaction [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] at different excitation energies are listed in Table 6. The υ expt values in the 238 U(n, f ) reaction from Table 6 and literature data in the 238 U(γ, f ) reaction are plotted in Fig.…”

Section: Nuclidementioning

confidence: 99%

“…5-11.3 MeV [24][25][26] and around 14 MeV [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][27][28][29][30][31][32][33]. Some data in the reactor neutron [6,7] and 3.72-10.09 MeV quasi-mono-energetic neutron [35] induced fission of 238 U are also determined by using off-line gamma ray spectrometric technique, where the nuclear structure was clearly shown. However, no fission product yields are available in literature for the 238 U(n, f ) reaction within the neutron energies of 11.3 to 14 MeV.…”

Section: Introductionmentioning

confidence: 99%

Measurement of fission product yields in the quasi-mono-energetic neutron-induced fission of 238U

et al. 2015

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The cumulative yields of various fission products in the 6. 35, 8.53, 9.35 and 12.52 MeV quasi-monoenergetic neutron induced fission of 238 U have been determined by using the off-line γ -ray spectrometric technique. The mass chain yields were obtained from the fission product yields by using charge distribution correction. From the mass yield data, the peak-to-valley (P/V) ratio, the average value of light mass ( A L ), heavy mass ( A H ) and thus the average number of neutrons ( υ expt ) were obtained in the 238 U(n, f ) reaction for the above mentioned four neutron energies. The present and literature data in the 238 U(n, f ) and 238 U (γ, f ) reactions at various energies were compared to arrive at the following conclusions. (i) The yields of fission products for A = 133-134, A = 138-140, and A = 143-144 and their complementary products in the 238 U(n, f ) and 238 U(γ, f ) reactions are higher than other fission products, which has been explained from the point of even-odd effect and standard I and standard II asymmetric mode of fission. (ii) The yields of symmetric products increase and thus the peak-to-valley (P/V) ratios decrease with excitation energy, whereas the ν expt values increase with excitation energy. (iii) The variation of A L , A H and υ expt values with excitation energy behave differently in between 238 U(n, f ) and 238 U(γ, f ) reactions, which may be due to the different types of reaction mechanism for the neutron and photon with 238 U. = 6. 35, 8.53, 9.35 and 12.52 MeV; measured fission product yields, mass yield distributions, off-line γ -ray spectrometric technique, peak-to-valley (P/V) ratio, average number of neutrons ( υ expt ), average light mass ( A L ), average heavy mass ( A H )

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“…[21,22,[45][46][47][48] for photofission of 238 U, and in Refs. [24,49] and [25,[50][51][52][53][54][55] for fission of, respectively, 235 U and 238 U, induced by monoenergetic neutrons.…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

“…In Ref. [19] the contributions of the fission modes are estimated from the mass-energy spectra of the fragments of fission induced by a References [22,48,55] give yields of the A = 134 mass chain for two γ -ray energies of 134 Te. We used the weighted average value of these.…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

Mass yield distributions and fission modes in photofission ofU238below 20 MeV

et al. 2015

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Photon activation technique is used to obtain photofission mass distributions of 238 U after irradiation in a bremsstrahlung beam with end-point energies 19.5, 29.1, 48.3, and 67.7 MeV. The weights of the symmetric (SL) and asymmetric (STI and STII) modes in the mass distributions of photofission of 238 U and neutron-induced fission of 235,238 U at the average excitation energies of up to 20 MeV are calculated on the basis of the obtained results and other available data. The weight of the SL mode increases by about an order of magnitude as the average excitation energy increases from 8.5 to 17 MeV, while the weight of the STI mode decreases by two times, and the weight of the STII mode slightly increases. It is shown that the peak-to-valley ratios in photofission of 238 U and neutron-induced fission of 235 U are very close across almost the whole studied energy range. A similar conclusion is made concerning the behavior of asymmetric and symmetric fission modes in photofission of 238 U and neutron-induced fission of 235 U and 238 U.

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Mass distribution in the quasi-mono-energetic neutron-induced fission of 238U

Cited by 23 publications

References 59 publications

Pre-neutron-emission Mass Distributions for Reaction ²³² Th( n, f ) up to 60 MeV

Pre-neutron-emission Mass Distributions for Reaction ²³² Th( n, f ) up to 60 MeV

Measurement of fission product yields in the quasi-mono-energetic neutron-induced fission of 238U

Mass yield distributions and fission modes in photofission ofU238below 20 MeV

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Mass distribution in the quasi-mono-energetic neutron-induced fission of 238U

Cited by 23 publications

References 59 publications

Pre-neutron-emission Mass Distributions for Reaction 232 Th( n, f ) up to 60 MeV

Pre-neutron-emission Mass Distributions for Reaction 232 Th( n, f ) up to 60 MeV

Measurement of fission product yields in the quasi-mono-energetic neutron-induced fission of 238U

Mass yield distributions and fission modes in photofission ofU238below 20 MeV

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Pre-neutron-emission Mass Distributions for Reaction ²³² Th( n, f ) up to 60 MeV

Pre-neutron-emission Mass Distributions for Reaction ²³² Th( n, f ) up to 60 MeV