<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>-delayed fission of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mrow><mml:mn mathvariant="bold">192</mml:mn><mml:mo>,</mml:mo><mml:mn mathvariant="bold">194</mml:mn></mml:mrow></mml:msup></mml:math>At

Andreyev, A. N.; Antalic, S.; Ackermann, D.; Bianco, L.; Franchoo, S.; Heinz, S.; Heßberger, F. P.; Hofmann, S.; Huyse, M.; Kalaninová, Z.; Kojouharov, I.; Kindler, B.; Lommel, B.; Mann, Robert B.; Nishio, K.; Page, R. D.; Ressler, J. J.; Štreicher, B.; Šáró, Š.; Sulignano, B.; Duppen, P. Van

doi:10.1103/physrevc.87.014317

Cited by 27 publications

(29 citation statements)

References 37 publications

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“…On the other hand, both models predict large positive Q EC (At) -B f (Po) values for 192 At, thus higher probabilities are expected in this case, which was indeed confirmed in the SHIP experiments [119]. A similar effect occurs for several βDF cases in the lead region, as discussed for 178 Tl [120], 186,188 Bi [121] and 196 At.…”

Section: Mechanism Of Beta-delayed Fission Conditions To Occur Obsesupporting

confidence: 65%

Alpha Decay and Beta-Delayed Fission: Tools for Nuclear Physics Studies

Duppen

Andreyev

2018

The Euroschool on Exotic Beams - Vol. 5

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Section: Mechanism Of Beta-delayed Fission Conditions To Occur Obsesupporting

confidence: 65%

Alpha Decay and Beta-Delayed Fission: Tools for Nuclear Physics Studies

Duppen

Andreyev

2018

The Euroschool on Exotic Beams - Vol. 5

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“…The discovery that fission of 180 Hg at low excitation energies (E * < 10 MeV) results in an asymmetric fragmentmass distribution [1] has led to a flurry of theoretical and experimental studies [2][3][4][5]. There are few theoretical approaches that can routinely be applied to basically all fissioning systems and which show substantial agreement with observations.…”

Section: Introductionmentioning

confidence: 77%

Calculated fission-fragment yield systematics in the region74≤Z≤94and90≤N≤150

Möller

Randrup

2015

Phys. Rev. C

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Background: In the seminal experiment by Schmidt et al. [Nucl. Phys. A 665, 221 (2000)] in which fissionfragment charge distributions were obtained for 70 nuclides, asymmetric distributions were seen above nucleon number A ≈ 226 and symmetric below. Because asymmetric fission had often loosely been explained as a preference for the nucleus to always exploit the extra binding of fragments near 132 Sn it was assumed that all systems below A ≈ 226 would fission symmetrically because available isotopes do not have a proton-to-neutron Z/N ratio that allows division into fragments near 132 Sn. But the finding by Andreyev et al. [Phys. Rev. Lett. 105, 252502 (2010)] did not conform to this expectation because the compound system 180 Hg was shown to fission asymmetrically. It was suggested that this was a new type of asymmetric fission, because no strong shell effects occur for any possible fragment division.Purpose: We calculate a reference data base for fission-fragment mass yields for a large region of the nuclear chart comprising 987 nuclides. A particular aim is to establish whether 180 Hg is part of a contiguous region of asymmetric fission and if so its extent, or if, in contrast to the actinides there are scattered smaller groups of nuclei that fission asymmetrically in this area of the nuclear chart. Methods:We use the by now well benchmarked Brownian shape-motion method and perform random walks on the previously calculated five-dimensional potential-energy surfaces. The calculated shell corrections are damped out with energy according to a prescription developed earlier. Results:We have obtained a theoretical reference data base of fission-fragment mass yields for 987 nuclides. These results show an extended region of asymmetric fission with approximate extension 74 ≤ Z ≤ 85 and 100 ≤ N ≤ 120. The calculated yields are highly variable. We show 20 representative plots of these variable features and summarize the main aspects of our results in terms of "nuclear-chart" plots showing calculated degrees of asymmetry versus N and Z.Conclusions: Experimental data in this region are rare: only ten or so yield distributions have been measured, some with very limited statistics. We agree with several measurements with higher statistics. Regions where there might be differences between our calculated results and measurements lie near the calculated transition line between symmetric and asymmetric fission. To draw more definite conclusions about the accuracy of the present implementation of the Brownian shape-motion approach in this region experimental data, with reliable statistics, for a fair number of suitably located additional nuclides are clearly needed. Because the nuclear potential-energy structure is so different in this region compared to the actinide region additional experimental data together with fission theory studies that incorporate additional, dynamical aspects should provide much new insight.

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“…Taken together, the data for 178,180 Hg firmly establish a new region of asymmetric fission, in addition to the previously known region in actinides. This work is a part of our program to study βDF in the very neutron-deficient isotopes in the Tl-to-Fr region, see, e.g., the recent βDF investigations of 186,188 Bi and 192,194 At [16,17].…”

Section: Present Workmentioning

confidence: 99%

β-delayed fission andαdecay of178Tl

Liberati¹,

Andreyev²,

Antalic³

et al. 2013

Phys. Rev. C

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ReuseItems deposited in White Rose Research Online are protected by copyright, with all rights reserved unless indicated otherwise. They may be downloaded and/or printed for private study, or other acts as permitted by national copyright laws. The publisher or other rights holders may allow further reproduction and re-use of the full text version. This is indicated by the licence information on the White Rose Research Online record for the item. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.PHYSICAL REVIEW C 88, 044322 (2013) A detailed nuclear-decay spectroscopy study of the neutron-deficient isotope 178 Tl has been performed using the highly selective Resonance Ionization Laser Ion Source and ISOLDE mass separator (CERN), which allowed a unique isobarically pure beam of 178 Tl to be produced. The first identification of the β-delayed fission of this isotope was made and its probability P βDF ( 178 Tl) = 0.15(6)% was determined. An asymmetric fission fragment mass distribution of the daughter isotope 178 Hg (populated by the β decay of 178 Tl) was deduced based on the measured fission fragment energies. The fine-structure α-decay pattern of 178 Tl allowed the low-energy states in the daughter nucleus 174 Au to be studied.

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β-delayed fission of192,194At

Cited by 27 publications

References 37 publications

Alpha Decay and Beta-Delayed Fission: Tools for Nuclear Physics Studies

Alpha Decay and Beta-Delayed Fission: Tools for Nuclear Physics Studies

Calculated fission-fragment yield systematics in the region74≤Z≤94and90≤N≤150

β-delayed fission andαdecay of178Tl

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