Lifetime measurements of nuclei formed in neutron emission

Kordyukevich, V.O.; Melikov, Yu.V.; Platonov, S. Yu.; Tulinov, A.F.; Fotina, O. V.; Yuminov, O. A.

doi:10.1016/0375-9474(89)90407-7

Cited by 7 publications

(2 citation statements)

References 9 publications

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“…For the other fraction of fission events, connected with the PS, the lifetime of the excited states in the second potential well will play an essential role. It was determined [11][12][13][14] that this lifetime is larger than 10 −19 s. Therefore, the fragment angular distribution is a weighted sum of the contributions determined by the first and the second saddle points, for nuclei with a double-humped fission barrier:…”

Section: Fragment Angular Distribution For Nuclei With Double-humped ...mentioning

confidence: 99%

“…The existence of the second deep minimum between the humps and the corresponding class of the quasi-stationary states can strongly influence the time characteristics of the excited nucleus decay. So, in the research of [11][12][13][14] the effect of the additional time delay in the fission of actinide nuclei was discovered and investigated. This time delay was connected with the lifetime of excited states in the second potential well, and this effect is observable only when population of the second well states (PS) has a high probability of taking place.…”

Section: Introductionmentioning

confidence: 99%

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Fragment angular distribution as a probe of fission dynamics in nuclei with two classes of excited states

Eremenko

Mellado

Platonov

et al. 1996

J. Phys. G: Nucl. Part. Phys.

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The fragment angular distribution from the multichance fission of excited nuclei with a double humped fission barrier is considered. It is shown that the fragment angular distribution is determined by contributions related to both the saddle points. The relative weights of these contributions are calculated in the framework of the diffusion model. The possibility of determining the nuclear dissipation is discussed. A comparison of the experimental data with the calculations leads to a value of the reduced dissipation coefficient β = (0.2 − 0.5) × 10 21 s −1 for the Pu isotopes produced in the 238 U + α reaction at E α = 37 and 43 MeV.

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Section: Fragment Angular Distribution For Nuclei With Double-humped ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%