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Danu, L. S.; Biswas, D. C.; Saxena, A.; Shrivastava, A.; Chatterjee, A.; Nayak, B. K.; Thomas, R. G.; Choudhury, R. K.; Palit, R.; Mazumdar, I.; Datta, Pradip; Chattopadhyay, S.; Pal, Subrata; Bhattacharya, Subhashish; Muralithar, S.; Golda, K. S.; Bhowmik, R. K.; Das, J. J.; Singh, R. P.; Madhavan, N.; Gerl, J.; Patra, S. K.; Satpathy, L.

doi:10.1103/physrevc.81.014311

Cited by 25 publications

(17 citation statements)

References 25 publications

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“…In this paper, we show that the conservation of isospin explains in a strikingly precise manner the observed relative yields of pairs of fission fragments of each of the (Z 1 , Z 2 ) partitions measured in two recent heavy ion induced fusion-fission experiments [7,8] as well as the thermal neutron induced fission [9]. The work shows the validity of isospin conservation in the neutron-rich heavy nuclei [10,11] and also confirms the theoretical predictions of Lane and Soper.…”

Section: Introductionmentioning

confidence: 76%

Conservation of Isospin in Neutron-rich Fission Fragments

Choudhury

Maheshwari

2014

Nuclear Data Sheets

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On the occasion of the 75 th anniversary of the fission phenomenon, we present a surprisingly simple result which highlights the important role of isospin and its conservation in neutron rich fission fragments. We have analysed the fission fragment mass distribution from two recent heavyion reactions 238 U( 18 O,f) and 208 Pb( 18 O,f) as well as a thermal neutron fission reaction 245 Cm(n th ,f). We find that the conservation of the total isospin explains the overall trend in the observed relative yields of fragment masses in each fission pair partition. The isospin values involved are very large making the effect dramatic. The findings open the way for more precise calculations of fission fragment distributions in heavy nuclei and may have far reaching consequences for the drip line nuclei, HI fusion reactions, and calculation of decay heat in the fission phenomenon.I.

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Section: Introductionmentioning

confidence: 76%

Conservation of Isospin in Neutron-rich Fission Fragments

Choudhury

Maheshwari

2014

Nuclear Data Sheets

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“…This agreement is not so good for Zr-Sn and Kr-Xe partitions. One reason for this deviation could be the presence of closed shell configuration at A = 124 (Z = 50) and A = 136 (N = 82) and their complementary fragments at A = 84 and A = 92 [9]. Another possibility is the presence of isomers at some of the points.…”

Section: Resultsmentioning

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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“…We, now, compare the partition-wise relative yields of fission fragments emitted in 238 U ( 18 O, f) from our calculations with the experimental data from Danu et al [17] in Fig. 6.…”

Section: U ( 18 O F )mentioning

confidence: 89%

“…A very brief account of our calculations and initial results for 208 Pb ( 18 O, f) have recently been presented in references [1,14]. In the present work, we present a detailed analysis of fission fragment mass distribution from three measurements [15,16,17]. The measurements of Bogachev et al [15], Banerjee et al [16] and Danu et al [17] are the first of its kind where both Z and A are precisely identified, although only for even-even fission fragments.…”

Section: Introductionmentioning

confidence: 91%

“…In the present work, we present a detailed analysis of fission fragment mass distribution from three measurements [15,16,17]. The measurements of Bogachev et al [15], Banerjee et al [16] and Danu et al [17] are the first of its kind where both Z and A are precisely identified, although only for even-even fission fragments. The fission fragment mass distributions were obtained for the compound nucleus 226 Th and 256 Fm formed in the reaction 18 O+ 208 Pb and 18 O+ 238 U respectively, employing the large detector arrays EUROBALL IV [18] and INGA [19] by using fission fragment gamma ray spectroscopy.…”

Section: Introductionmentioning

confidence: 95%

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Role of isospin and its conservation in neutron-rich fission fragments

Garg¹,

Maheshwari²

2018

Phys. Scr.

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Following upon our earlier paper [1] containing some initial results, we present detailed discussion and complete results in this paper, which provide the first direct evidence for the validity of isospin as a nearly good quantum number in neutron-rich systems. The evidence comes from the reproduction of the general features of the partition-wise relative yields of neutron-rich fission fragments produced in two heavy-ion induced fusion fission reactions, namely 208 Pb ( 18 O, f) and 238 U ( 18 O, f), by using the concept of isospin conservation. To fix the isospin values and use the isospin algebra, we invoke what we term as Kelson's conjectures. We present a consistent scheme for isospin assignments based on these considerations. Our calculated results confirm that isospin behaves as an approximately good quantum number in neutron-rich systems, in this case, the fission fragments.

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Fine structure dips in the fission fragment mass distribution for theU238(O18

Cited by 25 publications

References 25 publications

Conservation of Isospin in Neutron-rich Fission Fragments

Conservation of Isospin in Neutron-rich Fission Fragments

Isospin Conservation in Neutron Rich Systems of Heavy Nuclei

Role of isospin and its conservation in neutron-rich fission fragments

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