0000000001308130

AUTHOR

S. Lakshmi

showing 9 related works from this author

Fission Barrier of Superheavy Nuclei and Persistence of Shell Effects at High Spin: Cases ofNo254andTh220

2014

We report on the first measurement of the fission barrier height in a heavy shell-stabilized nucleus. The fission barrier height of No-254 is measured to be B-f = 6.0 +/- 0.5 MeV at spin 15 (h) over bar and, by extrapolation, B-f = 6.6 +/- 0.9 MeV at spin 0 (h) over bar. This information is deduced from the measured distribution of entry points in the excitation energy versus spin plane. The same measurement is performed for Th-220 and only a lower limit of the fission barrier height can be determined: B-f (I) > 8 MeV. Comparisons with theoretical fission barriers test theories that predict properties of superheavy elements.

PhysicsCluster decayFissionNuclear TheoryExtrapolationShell (structure)General Physics and Astronomy7. Clean energyNuclear physicsmedicine.anatomical_structuremedicineAtomic physicsNuclear ExperimentSpin (physics)NucleusExcitationBar (unit)Physical Review Letters
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Exploring the stability of super heavy elements: First Measurement of the Fission Barrier of $^{254} $No

2013

The gamma-ray multiplicity and total energy emitted by the heavy nucleus 254No have been measured at 2 different beam energies. From these measurements, the initial distributions of spin I and excitation energy E * of 254No were constructed. The distributions display a saturation in excitation energy, which allows a direct determination of the fission barrier. 254No is the heaviest shell-stabilized nucleus with a measured fission barrier. © Owned by the authors, published by EDP Sciences, 2014.

Physicsta114Fissionheavy elementsPhysicsQC1-999Nuclear Theoryfission barrierTransactinide elementstability[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]7. Clean energyNuclear physicsmedicine.anatomical_structuremedicineNuclear structureMultiplicity (chemistry)Total energyAtomic physicsNuclear ExperimentSaturation (magnetic)NucleusExcitationComputingMilieux_MISCELLANEOUS
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N-[3-Methyl-1-phenyl-1-(1H-tetrazol-1-yl)butan-2-yl]acetamide

2016

In the molecule of the title compound, C14H19N5O, the dihedral angle formed between the tetrazole and phenyl rings is 68.39 (4)°. In the crystal, molecules are linked by N—H...N, C—H...N and C—H...O hydrogen bonds to form two-dimensional networks extending parallel to thebcplane.

tetrazolecrystal structureacetamidebiologyChemistryHydrogen bondPlane (geometry)StereochemistryGeneral MedicineCrystal structureDihedral angle010402 general chemistry010403 inorganic & nuclear chemistrybiology.organism_classification01 natural sciences0104 chemical sciencesCrystalchemistry.chemical_compoundCrystallographyhydrogen bondslcsh:QD901-999TetraTetrazolelcsh:CrystallographyAcetamideIUCrData
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Stability and synthesis of superheavy elements: Fighting the battle against fission – example of $^{254}$No

2016

International audience; Superheavy nuclei exist solely due to quantum shell effects,which create a pocket in the potential-energy surface of the nucleus, thusproviding a barrier against spontaneous fission. Determining the height ofthe fission barrier and its angular-momentum dependence is important toquantify the role that microscopic shell corrections play in enhancing andextending the limits of nuclear stability. In this talk, the first measurement ofa fission barrier in the very heavy nucleus 254No will be presented.

FissionQC1-999Nuclear TheoryShell (structure)nuclear stabilitySuperheavy Elements[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciencesStability (probability)Nuclear physics0103 physical sciencesmedicinePhysics::Atomic and Molecular Clusters010306 general physicsNuclear ExperimentQuantumSpontaneous fissionPhysicsnobeliumta114010308 nuclear & particles physicsPhysicsfission barriersuperheavy elementsmedicine.anatomical_structureAtomic physicsNucleus
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CCDC 1427830: Experimental Crystal Structure Determination

2015

Related Article: K. Chandralekha, D. Gavaskar, A.R. Sureshbabu, S. Lakshmi|2015|Acta Crystallogr.,Sect.E:Cryst.Commun.|71|o814|doi:10.1107/S2056989015018034

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parameters5''-(4-chlorobenzylidene)-4'-(4-chlorophenyl)-1'-methyl-2H4''H-trispiro[acenaphthylene-12'-pyrrolidine-3'3''-cyclohexane-1''2'''-[13]dioxolane]-24''-dioneExperimental 3D Coordinates
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CCDC 1454097: Experimental Crystal Structure Determination

2016

Related Article: K. Chandralekha, D. Gavaskar, A.R. Sureshbabu, S. Lakshmi|2016|Acta Crystallogr.,Sect.E:Cryst.Commun.|72|387|doi:10.1107/S2056989016002875

Space GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates5''-benzylidene-1'-methyl-4'-phenyl-2H4''H-trispiro[acenaphthylene-12'-pyrrolidine-3'3''-cyclohexane-1''2'''-[13]dioxolane]-24''-dione
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CCDC 1516411: Experimental Crystal Structure Determination

2016

Related Article: S. Geetha, M.K. Yuva Priya, K. Chandralekha, S. Thennarasu, S. Lakshmi|2016|IUCrData|1|x161810|doi:10.1107/S2414314616018101

Space GroupCrystallographyN-(3-methyl-1-phenyl-1-(1H-tetrazol-1-yl)butan-2-yl)acetamideCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1017369: Experimental Crystal Structure Determination

2014

Related Article: K. Chandralekha, D. Gavaskar, A.R. Sureshbabu, S. Lakshmi|2014|Acta Crystallogr.,Sect.E:Struct.Rep.Online|70|124|doi:10.1107/S1600536814017644

Space GroupCrystallography(2'-Ferrocenyl-1'2'5'6'7'7a'-hexahydrospiro[indeno[12-b]quinoxaline-113'-pyrrolizin]-1'-yl)(4-methylphenyl)methanoneCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1546766: Experimental Crystal Structure Determination

2017

Related Article: K. Chandralekha, D. Gavaskar, A.R. Sureshbabu, S. Lakshmi|2017|IUCrData|2|x170639|doi:10.1107/S2414314617006393

Space GroupCrystallography5'-benzylidene-1''-methyl-4''-phenyl-4'H-trispiro[13-dioxolane-21'-cyclohexane-3'3''-pyrrolidine-2''3'''-indole]-2'''4'(1'''H)-dioneCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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