Conservation of Isospin in Neutron-rich Fission Fragments

Choudhury, D.; Maheshwari, Bhoomika

doi:10.1016/j.nds.2014.07.024

Cited by 9 publications

(8 citation statements)

References 12 publications

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“…This reinforces the claim made by Yadrovsky that a nucleus remembers isospin of the initial states leading to fission. This also provides further support to our claim of isospin conservation in fission as presented in [4,5].…”

Section: Discussionsupporting

confidence: 85%

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Does Compound Nucleus remember its Isospin- An Evidence from the Fission Widths

Garg¹

2018

EPJ Web Conf.

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We present an evidence of isospin effects in nuclear fission by comparing the fission widths for reactions involving different isospin states of the same compound nucleus (CN). Yadrovsky [1] suggested this possibility in 1975. Yadrovsky obtained the fission widths for two reaction data sets, namely 206 Pb(α,f) and 209 Bi(p,f), both leading to same CN, and concluded that "a nucleus remembers the isospin value of the nuclear states leading to fission". We obtain the fission decay widths for both the T 0 + 1 2 and T 0 − 1 2 states of CN by using two appropriate reaction data sets. We then compare the fission widths for the two isospin states of CN. More specifically, we have chosen the combination of 206 Pb(α,f) and 209 Bi(p,f) same as presented in Yadrovsky's paper [1] in this study. A significant difference between the ratios of fission decay widths to total decay widths for different isospin values suggests that isospin plays an important role in fission.

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Section: Discussionsupporting

confidence: 85%

“…The extra neutrons dilute the isospin impurity and isospin again becomes a nearly good quantum number in neutron-rich nuclei. We have used this concept of isospin conservation in reproducing the yields of neutron-rich fragments [4,5].…”

Section: Introductionmentioning

confidence: 99%

Does Compound Nucleus remember its Isospin- An Evidence from the Fission Widths

Garg¹

2018

EPJ Web Conf.

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“…Hence, the neutron rich nuclei produced through spontaneous fissions, heavy-ion induced fusion-fission and other induced-fission reactions should provide the necessary ground for testing the purity of isospin. Jain et al [40] proposed the aforesaid idea, and developed the necessary formalism based on Kelson's arguments [41], for assigning the specific isospin to neutron-rich fragment nuclei produced in a fission process. Subsequent calculations for the relative yields of the fission fragments were carried out based on the assigned isospin and related algebra.…”

Section: The Raw Yield Distributions Of the Complementary Fission Fra...mentioning

confidence: 99%

Measurement of relative isotopic yield distribution of even-even fission fragments from $^{235}$U($n_{th}$,$f$) following $γ$ ray spectroscopy

Dey,

Biswas,

Chakraborty

et al. 2021

Preprint

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A detailed investigation on the relative isotopic distributions has been carried out for the first time in case of even-even correlated fission fragments for the 235 U(n th ,f ) fission reaction. Highstatistics data were obtained in a prompt γ ray spectroscopy measurement during the EXILL campaign at ILL, Grenoble, France. The extensive off-line analysis of the coincidence data have been carried out using four different coincidence methods. Combining the results from 2-dimensional γ − γ and 3-dimensional γ − γ − γ coincidence analysis, a comprehensive picture of the relative isotopic yield distributions of the even-even neutron-rich fission fragments has emerged. The experimentally observed results have been substantiated by the theoretical calculations based on a novel approach of isospin conservation, and a reasonable agreement has been obtained. The calculations following the semi-empirical GEF model have also been carried out. The results from the GEF model calculations are found to be in fair agreement with the experimental results.

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“…Lane and Soper [2] also showed in a theoretical calculation that isospin indeed remains quite good in heavy mass neutron rich systems. In this paper, we present isospin based calculations [3,4] for the fission fragment distributions obtained from heavy-ion fusion fission reactions. We discuss in detail the procedure adopted to assign the isospin values and the role of neutron multiplicity data in obtaining the total fission fragment distributions.…”

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confidence: 99%

Isospin Conservation in Neutron Rich Systems of Heavy Nuclei

Garg

2018

EPJ Web Conf.

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It is generally believed that isospin would diminish in its importance as we go towards heavy mass region due to isospin mixing caused by the growing Coulomb forces. However, it was realized quite early that isospin could become an important and useful quantum number for all nuclei including heavy nuclei due to neutron richness of the systems [1]. Lane and Soper [2] also showed in a theoretical calculation that isospin indeed remains quite good in heavy mass neutron rich systems. In this paper, we present isospin based calculations [3,4] for the fission fragment distributions obtained from heavy-ion fusion fission reactions. We discuss in detail the procedure adopted to assign the isospin values and the role of neutron multiplicity data in obtaining the total fission fragment distributions. We show that the observed fragment distributions can be reproduced rather reasonably well by the calculations based on the idea of conservation of isospin. This is a direct experimental evidence of the validity of isospin in heavy nuclei, which arises largely due to the neutron-rich nature of heavy nuclei and their fragments. This result may eventually become useful for the theories of nuclear fission and also in other practical applications.

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Conservation of Isospin in Neutron-rich Fission Fragments

Cited by 9 publications

References 12 publications

Does Compound Nucleus remember its Isospin- An Evidence from the Fission Widths

Does Compound Nucleus remember its Isospin- An Evidence from the Fission Widths

Measurement of relative isotopic yield distribution of even-even fission fragments from $^{235}$U($n_{th}$,$f$) following $γ$ ray spectroscopy

Isospin Conservation in Neutron Rich Systems of Heavy Nuclei

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