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Experimental invest...
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Hinde, D. J.Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.
(författare)
Experimental investigation of the role of shell structure in quasifission mass distributions
- Artikel/kapitelEngelska2022
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American Physical Society,2022
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LIBRIS-ID:oai:DiVA.org:mau-58399
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https://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-58399URI
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https://doi.org/10.1103/PhysRevC.106.064614DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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Background: To understand superheavy element synthesis reactions, quantifying the role of quantum shells in quasifission dynamics is important. In reactions with actinide nuclides, a wide peak in the binary quasifission mass yield is seen, centered close to the 208Pb mass. It is generally attributed to the 208Pb spherical closed shells causing a valley in the potential-energy surface, attracting flux to these mass splits. However, an early experiment studying 48Ca, 50Ti+238U reactions showed strong evidence that sequential fission plays an important role in generating the observed peak. These conflicting interpretations have not been resolved up to now.Purpose: This work aims to measure quasifission mass spectra for reactions with nuclei lighter than 208Pb, having negligible sequential fission, to search for systematic features correlated with the proton shells known to affect low-energy fission mass distributions of the same actinide elements.Methods: Systematic measurements have been made at energies near and below the capture barriers (where quasifission is most prominent) of mass-angle distributions for fission following collisions of 48Ti projectiles with even-even nuclides from 154Sm to 200Hg. Mean excitation energies above the ground-states ranged from 51 to 33 MeV, respectively.Results: With increasing compound nucleus atomic number ZCN, a rapid transition occurs from fission having characteristics of fusion-fission to fast quasifission. The heaviest reactions form 240Cf, 244Fm, and 248No. Low -energy fission of neighboring isotopes is mass asymmetric, correlated with proton number Z = 56. However, peak quasifission yields are at mass-symmetry for all reactions. There appears to be a very small (P-3%) systematic excess of yield correlated with Z = 56, however this is at the limit of sensitivity of the experiment.Conclusions: No significant (>3%) systematic features are seen in the quasifission mass spectra that can be unambiguously identified as resulting from shells. This small influence may result from attenuation of shell effects due to the excitation energy introduced, even in these near-barrier reactions giving low excitation energies typical of superheavy element synthesis reactions.
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du Rietz, R.Malmö universitet,Institutionen för materialvetenskap och tillämpad matematik (MTM),Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.(Swepub:mau)tsriri
(författare)
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Jeung, D. Y.Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.
(författare)
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Cook, K. J.Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.
(författare)
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Dasgupta, M.Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.
(författare)
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Simpson, E. C.Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.
(författare)
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Thomas, R. G.Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.;Bhabha Atom Res Ctr, Mumbai, India.
(författare)
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Evers, M.Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.;PwC Canberra, Forrest, ACT 2603, Australia.
(författare)
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Lin, C. J.Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.;China Inst Atom Energy, POB 27510, Beijing 102413, Peoples R China.
(författare)
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Luong, D. H.Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.;10 Quinn St, Deer Pk, Vic 3023, Australia.
(författare)
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Gasques, L. R.Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.;Univ Sao Paulo, Inst Fis, Rua Matao 1371, BR-05308090 Sao Paulo, SP, Brazil.
(författare)
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Rafiei, R.Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.;Reformulate Hlth, Woolahra, NSW 2025, Australia.
(författare)
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Wakhle, A.Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.;Adaptas Solut, Sydney, NSW, Australia.
(författare)
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Simenel, C.Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.;Australian Natl Univ, Res Sch Phys, Dept Theoret Phys, Canberra, ACT 2601, Australia.
(författare)
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Australian Natl Univ, Res Sch Phys, Dept Nucl Phys & Accelerator Applicat, Canberra, ACT 2601, Australia.Institutionen för materialvetenskap och tillämpad matematik (MTM)
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Physical Review C: American Physical Society106:62469-99852469-9993
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Hinde, D. J.
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du Rietz, R.
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Jeung, D. Y.
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Cook, K. J.
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Dasgupta, M.
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Simpson, E. C.
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visa fler...
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Thomas, R. G.
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Evers, M.
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Lin, C. J.
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Luong, D. H.
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Gasques, L. R.
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Rafiei, R.
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Wakhle, A.
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Simenel, C.
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