0000000000412049
AUTHOR
S. Lakshmi
Fission Barrier of Superheavy Nuclei and Persistence of Shell Effects at High Spin: Cases ofNo254andTh220
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.
Exploring the stability of super heavy elements: First Measurement of the Fission Barrier of $^{254} $No
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.
N-[3-Methyl-1-phenyl-1-(1H-tetrazol-1-yl)butan-2-yl]acetamide
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.
Stability and synthesis of superheavy elements: Fighting the battle against fission – example of $^{254}$No
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.
CCDC 1427830: Experimental Crystal Structure Determination
Related Article: K. Chandralekha, D. Gavaskar, A.R. Sureshbabu, S. Lakshmi|2015|Acta Crystallogr.,Sect.E:Cryst.Commun.|71|o814|doi:10.1107/S2056989015018034
CCDC 1454097: Experimental Crystal Structure Determination
Related Article: K. Chandralekha, D. Gavaskar, A.R. Sureshbabu, S. Lakshmi|2016|Acta Crystallogr.,Sect.E:Cryst.Commun.|72|387|doi:10.1107/S2056989016002875
CCDC 1516411: Experimental Crystal Structure Determination
Related Article: S. Geetha, M.K. Yuva Priya, K. Chandralekha, S. Thennarasu, S. Lakshmi|2016|IUCrData|1|x161810|doi:10.1107/S2414314616018101
CCDC 1017369: Experimental Crystal Structure Determination
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
CCDC 1546766: Experimental Crystal Structure Determination
Related Article: K. Chandralekha, D. Gavaskar, A.R. Sureshbabu, S. Lakshmi|2017|IUCrData|2|x170639|doi:10.1107/S2414314617006393