Dependence of fragment angular momentum on entrance channel in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">U</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>236</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>fission

Datta, T.; Sahakundu, S. M.; Dange, S. P.; Chakravarty, Ν.; Guin, R.; Prakash, Satya

doi:10.1103/physrevc.28.1206

Cited by 11 publications

(16 citation statements)

References 12 publications

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“…[15] where the isomer ratios of fission fragments at high excitation energies were studied, and in Ref. [43] where the dependence of fragment angular momentum on the entrance channel in 236 U fission was investigated. Surprisingly, the isomeric yield ratio of 97 Y seems rather insensitive to the fissioning system and excitation energy, as the result by Denschlag et al [74] is very close to our fractional yield.…”

Section: Discussion On the Isomeric Yield Ratiosmentioning

confidence: 99%

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First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments

et al. 2018

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Publisher's PDF Rakopoulos, V.; Lantz, M.; Solders, A.; Al-Adili, A.; Mattera, A.; Canete, Laetitia; Eronen, Tommi; Gorelov, Dmitry; Jokinen, Ari; Kankainen, Anu; Kolhinen, Veli; Moore, Iain; Nesterenko, Dmitrii; Penttilä, Heikki; Pohjalainen, Ilkka; Rinta-Antila, Sami; Simutkin, V.; Vilén, Markus; Voss, Annika; Pomp, S.Rakopoulos, V., Lantz, M., Solders, A., Al-Adili, A., Mattera, A., Canete, L., . . . Pomp, S. (2018). First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments. Physical Review C, 98 (2) We report the first experimental determination of independent isomeric yield ratios using direct ion counting with a Penning trap, which offered such a high resolution in mass that isomeric states could be separated. The measurements were performed at the Ion Guide Isotope Separator On-Line (IGISOL) facility at the University of Jyväskylä. The isomer production ratios of 81 Moreover, based on the isomeric yield ratios, the root-mean-square angular momenta (J rms ) of the fission fragments after scission were estimated using the TALYS code. The experimentally determined isomeric yield ratios, and consequently the deduced J rms , for 130 Sn are significantly lower compared to 128 Sn for both fissioning systems. This can be attributed to the more spherical shape of the fragments that contribute to the formation of 130 Sn, due to their proximity to the N = 82 shell closure. The values of J rms for 129 Sb are higher than 128 Sn for both reactions, despite the same neutron number of both nuclides (N = 78), indicating the odd-Z effect where fission fragments with odd-Z number tend to bear larger angular momentum than even-Z fragments. The isomer production ratio for the isotopes of Sn is more enhanced in the nat U(p, f ) reaction than in 232 Th(p, f ). The opposite is observed for 96 Y and 97 Y. These discrepancies might be associated to different scission shapes of the fragments for the two fission reactions, indicating the impact that the different fission modes can have on the isomeric yield ratios.

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Section: Discussion On the Isomeric Yield Ratiosmentioning

confidence: 99%

“…The results have been used to investigate collective rotational degrees of freedom [15,[40][41][42][43][44]. However, there are several challenges in these techniques, such as insufficient mass resolving power (MRP) in the separator, difficulties to study refractory elements, and inadequate knowledge of decay schemes.…”

Section: Introductionmentioning

confidence: 99%

First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments

et al. 2018

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“…The areas of the photopeaks of interest were corrected for a linear Compton background. From the observed composite activities of the fission product isomers for both 13 ~Te and 133Te as a function of time, the independent isomeric yield ratios (R) were deduced using standard decay-growth equations and least-square analysis [7] after correcting for the precursor contributions. The ratio R is defined as Ym/(Ym+ Yg) where Ym and Yg are the fractional independent yields of the mand g-states respectively of a fission product.…”

Section: Methodsmentioning

confidence: 99%

“…The fission products were collected using the recoilcatcher technique on aluminium catcher foils (thickness 25 gn). Tellurium (Te) was separated radiochemically [7] from the dissolved catcher foils at the end of the irradiations. Standard aliquots of the Te-samples were counted at fixed sample-detector geometry on a 45 cc.…”

Section: Methodsmentioning

confidence: 99%

“…In view of this, in the present work angular momental (Jrms) were deduced for the fragments corresponding to the fission products 131Te and 133Te in 40 MeV e-particle induced fission of 232Th and 238U from the radiochemically determined independent isomeric yield ratios and statistical model based analysis [7]. These data were compared with the Jrms for the same fragments in the same fissioning nuclei e.g., 236U and 242Pu at lower energies reported earlier from this laboratory [73.…”

Section: Introductionmentioning

confidence: 96%

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Influence of collective rotational degrees of freedom in medium energy fission

Datta

Dange

Sahakundu

et al. 1988

Z. Physik A - Atomic Nuclei

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In the present work rms angular momenta have been deduced for the fission fragments corresponding to 131Tem'g and 133Tem'g in 232Th(~zr f) and 238U(e40MeV, f) systems from the radiochemically determined independent isomeric yield ratios and statistical model based analysis. For 131Te and 133Te the rms angular momenta deduced are 5.9-t-1.0 and 7.9___ 1.2 ta respectively in z3aTh(e4oMev, f) and 7.2+_0.6 and 8.0+0.8 ra respectively in z3SU(~ 4oraev,j~-c~ Comparison of the present data with the literature data for these fragments in the same compound nuclei 236U* and 24Zpu* at lower excitation energies shows increase in the fragment angular momentum with increasing excitation energy and angular momenta of the fissioning nuclei. Fragment angular momentum deduced theoretically for asymmetric and deformed fragments on the basis of thermal equilibration of the collective rotational degrees e.g., rigid rotation, wriggling, tilting, bending and twisting modes considering the effect of multichance fission, are in good agreement with the experimental observations.

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Influence of fission fragment nuclear structure on scission configuration in252Cf (S.F.)

Datta

Dange

Das

et al. 1986

Z. Physik A - Atomic Nuclei

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With the aim of investigating the influence of fragment nuclear structure e.g. shell closure configuration and odd-even nature on the scission configuration, fragment angular momenta have been deduced from the radiochemically determined independent isomeric yield ratios of the fission products ltlPd, 131Te, 133Te, 134I and 13SCs in 252Cf spontaneous fission. The fragments' angular momenta deduced are 8.8_+1.5, 5.8 _+ 1.0, 6.1 _+ 1.1, 11.5 _+ 1.1 and 9.8 __ 1.2h respectively. The angular momenta data from this work and literature have been analysed to arrive at fragments' deformations at the scission bringing out the influence of the spherical 82n and deformed 66n and 88n shells. The fragment angular momenta were also seen to be inversely correlated to their elemental yields exhibiting odd-even fluctuations. This has been explained in terms of equilibration of the collective degrees of freedom in low energy fission.

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Dependence of fragment angular momentum on entrance channel inU236fission

Cited by 11 publications

References 12 publications

First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments

First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments

Influence of collective rotational degrees of freedom in medium energy fission

Influence of fission fragment nuclear structure on scission configuration in252Cf (S.F.)

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