K-hindered decay of a six-quasiparticle isomer inHf176

Abstract

The structure and decay properties of high-K isomers in 176 Hf have been studied using beam sweeping techniques and the Gammasphere multi-detector array. A new ∆K = 8 decay branch, from a K π = 22 − , six-quasiparticle, isomeric (t 1/2 = 43µs) state at 4864 keV to the 20 − state of a K π = 14 − band, has been identified. The reduced hindrance factor per degree of K forbiddenness for this decay is measured to be unusually low (f ν = 3.2), which suggests K mixing in the states 2

Ritz variational method for the high‐lying nonautoionizing doubly excited 1,3Fe states of two‐electron atoms

“…cos u 1 52sin ucos w2 1 2 u 12 (4) Here, u 12 is the angle betweenr 1 andr 2 . Using these two transformation relations (3) and (4) whereÊ 12 is the two-electron permutation operator. The trial radial wave function f r 1 ; r 2 ; r 12 ð Þcan be written as,…”

“…Electron-electron correlation plays an important role in forming these kinds of states and thus Ritz variational method with the trial wave function expanded in explicitly correlated Hylleraas type basis is proven to be the best procedure for theoretical estimation of energy levels and other structural properties of such states. Although, there exists a large number of investigations in the literature related to structural and spectral features of DESs having low total angular momentum (upto L 5 2), [10][11][12][13][14][15][16][17][18][19][20][21][22][23] but the same for other high angular momentum states are rather scanty. [14,[24][25][26][27][28][29] For a two-electron atom, the lowest lying doubly excited nonautoionizing F state (L 5 3) of even parity originates from 2p4f configuration.…”

Phenyliodine Bis(trifluoroacetate) (PIFA) as an Excellent Promoter of 2‐Deoxy‐2‐phthalimido‐1‐thioglycosides in the Presence of Triflic Acid in Glycosylation Reactions

“…[7] Recently, the alternative combinations of NIS and a Lewis acid were also exploited as the promoter of the thioglycoside activation. [8][9][10][11][12][13] Recently, the environmentally benign hypervalent iodine oxidation has witnessed profound progress in the field of organic chemistry. [14] The low toxicity, ready availability and easy handling of hypervalent iodine compounds are expected to be useful features for the activation of the sulfur atom.…”

Expedient Synthesis of the Pentasaccharide Repeating Unit of the Polysaccharide O‐Antigen of Escherichia coli O11

“…The disaccharidet hioglycoside 13 was prepared by the glycosylation of two thioglycoside derivatives (11 and 12)i nw hich compound 11 acted as glycosyl donor, allowing compound 12 to act as glycosyl acceptor by tuning their relative reactivity profile. The trisaccharide acceptor 10 was allowed to couple stereoselectively with the disaccharide thioglycoside 13 under ar ecently reported glycosylation condition [25] to give the pentasaccharide derivative 14 in fairly good yield. The 2-aminoethyl group at the reducingt erminal of the pentasaccharide 1 could be used to conjugate the glycan moiety with an appropriate protein.…”

“…Treatmento fc ompound 3 with sodiumm ethoxide [28] gave the de-O-acetylated product, which on treatment with benzaldehyde dimethyl acetal in the presence of p-toluenesulfonic acid [29] led to the formation of compound 4 in 76 %o verall yield. Iodonium-ion-mediated stereoselective 1,2-cis glycosylation of compound 4 with l-fucosyl thioglycoside donor 5 in the presence of ac ombination [25] of N-iodosuccinimide (NIS) and perchloric acid supported over SiO 2 (HClO 4 ÀSiO 2 ) [30] in am ixed solvent (CH 2 Cl 2 ÀEt 2 O; 1:2) resultedi nt he formation of the disaccharide derivative 6 in 70 %yield. The spectralanalysis of compound 6 confirmed its formation:s ignals at d = 5.05 (d, J = 3.5 Hz, H-1 B )a nd 4.28 ppm (d, J = 9.0 Hz, H-1 A )i nt he 1 HNMR and at 102.7 (C-1 A )a nd 100.3 ppm (C-1 B )i nt he 13 CNMR spectra.…”