Independent isomeric yield ratio of 148Pm in the thermal-neutron induced fission of 233U

Umezawa, Hirokazu

doi:10.1016/0022-1902(73)80545-7

Cited by 13 publications

(4 citation statements)

References 26 publications

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“…The good agreement between WOLFS-BERG's [19] and our 239 Pu-data may be due to the fact that he used a function given by REISDORF et al [21] for the most probable charge Zp. Our values for the independent yields of 148m Pm and 148g Pm in the thermal-neutron-induced fission of 233 U agree well with the results reported by UMEZAWA [7] andAUMANN et al [5]. For this fissioning system, however, no agreement exists between the experimental re-sults and those from model calculations [18,19].…”

Section: Discussionsupporting

confidence: 89%

“…Furthermore, measurements of independent yield isomerratios of fission products can give valuable information on the average intrinsic angular momentum of the primary fission fragments. The method was suggested by WARHA-NEK and VANDENBOSCH [8] and was later applied to the 148 Pm isomer pair formed in the fission of 233 U and 235 U [7,9]. This isomer pair is well suited for such an investigation because both isomers are fairly long-lived and have considerably different spins, i. e. 148m Prn 41.3 d (6-) and 148g Pm 5.37 d (1-).…”

Section: Introductionmentioning

confidence: 99%

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Independent Yields of ^148mPm and ^148gPm in the Thermal-Neutron-Induced Fission of ²³³U and ²³⁹Pu

Zwicky¹,

Gunten²

1980

Radiochimica Acta

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The independent yields of 148m Pm and 148g Pm were measured in the thermal-neutron-induced fission of 233 U and 235 Pu using radiochemical techniques. In the fission of 233 U these yields are (8.6 ± 1.1)X 10"' % and (3.1 ± 0.8) Χ 10" 7 %, respectively, for i4«mp m an( j ι <«gp m The corresponding values for 2 39 Pu are (4.3 + 0.3)X 10" 6 % and (1.2 ± 0.2)X 10" 6 %. Deviationsof these yields from an "universal" Gaussian charge distribution with a a = 0.56 ±0.06 are observed. The isomeric yield ratios are consistent for both fissioning nuclides and agree also with a simple model prédiction.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Independent Yields of ^148mPm and ^148gPm in the Thermal-Neutron-Induced Fission of ²³³U and ²³⁹Pu

Zwicky¹,

Gunten²

1980

Radiochimica Acta

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“…Figure 2a shows the obtained isomeric yield ratios plotted against the fragment mass number. And the published results in the thermal neutron induced fission of 233U [16,17,[55][56][57][58][59], 235U [15][16][17][58][59][60][61][62][63] and 239pu [16,17,57,59] are summarized in Fig. 2b.…”

Section: Isomeric Yiem Ratiosmentioning

confidence: 97%

“…There are some experimental facts in view of the effect of the charge distribution of the fission product. For example, in the thermal neutron-induced fission of 23sU, the isomeric yield ratios of ]48pm [56][57][58] and 148pr [ 15] were measured and the deduced angular momenta are quite different from each other. In the present work, the isomer ratios of more than two isobars were obtained for A= 116, 128, 130, and 132.…”

Section: Interpretation O F Fragment Angular Momentummentioning

confidence: 99%

Isomeric yield ratios of fission products in the system of 24 MeV proton-induced fission of238U

Tanikawa

Kudo

Sunaoshi

et al. 1993

Z. Physik A - Hadrons and Nuclei

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Abstract. Isomeric yield ratios of 30 fission products in 24 MeV proton-induced fission of 23au were measured by the use of the ion-guide isotope separator on-line. The obtained isomeric yield ratios were converted to the angular momenta of primary fission fragments based on the statistical model. The deduced angular momenta were examined from various aspects. It is found that in general the angular momentum continuously increases with the fragment mass number including the region of symmetric mass division. However, there are some exceptions. For Sn isotopes the deduced angular momenta are quite small due to the spherical shape of the nuclear shell configuration. It is also concluded from the consideration of the charge distribution that the angular momentum of fission product scatters considerably within the narrow range of mass division. The dependence of the angular momentum on the available energy of fragments at scission point indicates that the individual fragment possesses a characteristic deformation at scission and/or the deduced angular momentum is seriously affected by the particle excitation after scission.

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Isomeric yield ratio of fission product148Pr in235U(n th,f)

1984

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The independent isomeric yield ratio of 148Pr in thermal neutron induced fission of 2asU has been determined experimentally. The fission product 14~pr isomers, extracted directly by on-line mass separation technique, have high-spin (J=4) to low-spin (J= 1) isomer ratio of 0.14 + 0.04 using growth and decay analysis. Statistical model calculation of isomeric yeild ratio using constant initial r:m.s, angular momentum J~ms can not reproduce either present results or other recent measurements of isomer ratios. The Jrms derived from isomer ratio data in all thermal fissioning systems indicate a wide spread ranging from 2h to 13h. No clear correlation between Jrm~ and isomeric spins or number of neutrons of isomers is found, thus, more model refinements and experimental works should be done in order to evaluate independent isomeric yields correctly.

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Independent isomeric yield ratio of 148Pm in the thermal-neutron induced fission of 233U

Cited by 13 publications

References 26 publications

Independent Yields of ^148mPm and ^148gPm in the Thermal-Neutron-Induced Fission of ²³³U and ²³⁹Pu

Independent Yields of ^148mPm and ^148gPm in the Thermal-Neutron-Induced Fission of ²³³U and ²³⁹Pu

Isomeric yield ratios of fission products in the system of 24 MeV proton-induced fission of238U

Isomeric yield ratio of fission product148Pr in235U(n th,f)

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Independent isomeric yield ratio of 148Pm in the thermal-neutron induced fission of 233U

Cited by 13 publications

References 26 publications

Independent Yields of 148mPm and 148gPm in the Thermal-Neutron-Induced Fission of 233U and 239Pu

Independent Yields of 148mPm and 148gPm in the Thermal-Neutron-Induced Fission of 233U and 239Pu

Isomeric yield ratios of fission products in the system of 24 MeV proton-induced fission of238U

Isomeric yield ratio of fission product148Pr in235U(n th,f)

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Independent Yields of ^148mPm and ^148gPm in the Thermal-Neutron-Induced Fission of ²³³U and ²³⁹Pu

Independent Yields of ^148mPm and ^148gPm in the Thermal-Neutron-Induced Fission of ²³³U and ²³⁹Pu