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Evidence for the Role of Proton Shell Closure in Quasifission Reactions from X-Ray Fluorescence of Mass-Identified Fragments

Morjean, M; Hinde, David; Simenel, C; Jeung, D Y; Airiau, M; Cook, K J; Dasgupta, M; Drouart, A; Jacquet, D; Kalkal, S; Palshetkar, C S; Prasad, E; Rafferty, D; Simpson, E C; Tassan-Got, L; Vo-Phuoc, K; Williams, E

Description

The atomic numbers and the masses of fragments formed in quasifission reactions are simultaneously measured at scission in ^{48}Ti+^{238}U reactions at a laboratory energy of 286 MeV. The atomic numbers are determined from measured characteristic fluorescence x rays, whereas the masses are obtained from the emission angles and times of flight of the two emerging fragments. For the first time, thanks to this full identification of the quasifission fragments on a broad angular range, the...[Show more]

dc.contributor.authorMorjean, M
dc.contributor.authorHinde, David
dc.contributor.authorSimenel, C
dc.contributor.authorJeung, D Y
dc.contributor.authorAiriau, M
dc.contributor.authorCook, K J
dc.contributor.authorDasgupta, M
dc.contributor.authorDrouart, A
dc.contributor.authorJacquet, D
dc.contributor.authorKalkal, S
dc.contributor.authorPalshetkar, C S
dc.contributor.authorPrasad, E
dc.contributor.authorRafferty, D
dc.contributor.authorSimpson, E C
dc.contributor.authorTassan-Got, L
dc.contributor.authorVo-Phuoc, K
dc.contributor.authorWilliams, E
dc.date.accessioned2018-11-05T04:31:03Z
dc.date.available2018-11-05T04:31:03Z
dc.identifier.issn0031-9007
dc.identifier.urihttp://hdl.handle.net/1885/148851
dc.description.abstractThe atomic numbers and the masses of fragments formed in quasifission reactions are simultaneously measured at scission in ^{48}Ti+^{238}U reactions at a laboratory energy of 286 MeV. The atomic numbers are determined from measured characteristic fluorescence x rays, whereas the masses are obtained from the emission angles and times of flight of the two emerging fragments. For the first time, thanks to this full identification of the quasifission fragments on a broad angular range, the important role of the proton shell closure at Z=82 is evidenced by the associated maximum production yield, a maximum predicted by time-dependent Hartree-Fock calculations. This new experimental approach gives now access to precise studies of the time dependence of the N/Z (neutron over proton ratios of the fragments) evolution in quasifission reactions.
dc.description.sponsorshipThe authors acknowledge support from the Australian Research Council through Discovery Grants No. FL110100098, No. FT120100760, No. DP130101569, No. DE140100784, No. DP160 101254, and No. DP170102318. Support for accelerator operations through the NCRIS program is acknowledged. Two of us (C. S. and M. A.) acknowledge support from the Scientific Mobility Program of the Embassy of France in Australia. This research was undertaken with the assistance of resources from the National Computational Infrastructure (NCI), which is supported by the Australian Government.
dc.format.mimetypeapplication/pdf
dc.publisherAmerican Physical Society
dc.rights© 2017 American Physical Society. http://www.sherpa.ac.uk/romeo/issn/0031-9007/..."author can archive publisher's version/PDF" from SHERPA/RoMEO site (as at 5/11/18)
dc.sourcePhysical review letters
dc.titleEvidence for the Role of Proton Shell Closure in Quasifission Reactions from X-Ray Fluorescence of Mass-Identified Fragments
dc.typeJournal article
local.identifier.citationvolume119
dc.date.issued2017-12-01
local.publisher.urlhttps://www.aps.org/
local.type.statusPublished Version
local.contributor.affiliationHinde, D., Research School of Physics & Engineering, The Australian National University
dc.relationhttp://purl.org/au-research/grants/arc/FL110100098
dc.relationhttp://purl.org/au-research/grants/arc/FT120100760
dc.relationhttp://purl.org/au-research/grants/arc/DP130101569
dc.relationhttp://purl.org/au-research/grants/arc/DE140100784
dc.relationhttp://purl.org/au-research/grants/arc/DP160101254
dc.relationhttp://purl.org/au-research/grants/arc/DP170102318
local.identifier.essn1079-7114
local.bibliographicCitation.issue22
local.bibliographicCitation.startpage222502
local.identifier.doi10.1103/PhysRevLett.119.222502
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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