First observation of spontaneous fission of232U

Abstract

By using a low-sensitivity glass track detector in planar geometry we measured the decay rate of 232 U by spontaneous fission to be SF ϭ(8.6Ϯ1.8)ϫ10 Ϫ24 s Ϫ1 , corresponding to a half-life T 1/2 ϭ(8.1Ϯ1.7)ϫ10 22 s. The inconsistency and consistency of this result with previous work is discussed, and spontaneous fission half-lives are compared with cluster decay ones for the various uranium isotopes measured up to now. PACS number͑s͒: 23.70.ϩj, 27.90.ϩb 232

Role of higher-multipole deformations in exoticC14cluster radioactivity

“…The experimental data are from Refs. [1][2][3]35]. It is clearly evident that the data are best fitted for (β 2i , β 3i , β 4i ) case, i.e., when higher-multipole deformations are included.…”

“…A charged particle, heavier than 4 He but lighter than a fission fragment, is spontaneously emitted in a cluster decay mode of an atomic nucleus. There is a whole family of such disintegration modes, namely, 12,14 C, 15 N, 18,20 O, 23 F, 22,24−26 Ne, 28,30 Mg, 32,34 Si, 46 Ar, and 48,50 Ca from various parent nuclei, that are either observed or indicated as possible decay modes with upper limits given for their decay half-lives [1][2][3].…”

“…values based on binding energies from Möller et al[31]. The experimental data are taken from Refs [1][2][3]35]…”

(Coumarin‐4‐yl)methyl Esters as Highly Efficient, Ultrafast Phototriggers for Protons and Their Application to Acidifying Membrane Surfaces

“…With these proton sources ("caged protons"), the spatial and temporal pH distribution can be controlled without diffusional mixing delays. [1,2] Most of the precursors are nitrobenzyl derivatives, namely 2-nitrobenzaldehydes, [3][4][5] as well as 2-nitrobenzyl and/or 1-(2-nitrophenyl)ethyl acetates, [1] phosphates, [6][7][8] tosylates, [9,10] and sulfates. [7,11] Their application is limited by the low efficiency of the activation in the long-wavelength UV/Vis range and the generation of reactive o-nitrosocarbonyl photoproducts.Here we introduce (6,7-dimethoxycoumarin-4-yl)methyl (DMCM) diethyl phosphate (1), DMCM methanesulfonate (2), and sodium DMCM sulfate (3), as well as [7-(dimethylamino)coumarin-4-yl]methyl (DMACM) diethyl phosphate (4), DMACM methanesulfonate (5), and sodium DMACM sulfate (6) as a new class of phototriggers for protons that facilitates the study of proton-dependent biological processes (Scheme 1).…”

“…With these proton sources ("caged protons"), the spatial and temporal pH distribution can be controlled without diffusional mixing delays. [1,2] Most of the precursors are nitrobenzyl derivatives, namely 2-nitrobenzaldehydes, [3][4][5] as well as 2-nitrobenzyl and/or 1-(2-nitrophenyl)ethyl acetates, [1] phosphates, [6][7][8] tosylates, [9,10] and sulfates. [7,11] Their application is limited by the low efficiency of the activation in the long-wavelength UV/Vis range and the generation of reactive o-nitrosocarbonyl photoproducts.…”