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171.
Andreoiu C Døssing T Fahlander C Ragnarsson I Rudolph D Aberg S Austin RA Carpenter MP Clark RM Janssens RV Khoo TL Kondev FG Lauritsen T Rodinger T Sarantites DG Seweryniak D Steinhardt T Svensson CE Thelen O Waddington JC 《Physical review letters》2003,91(23):232502
The decay-out process of the yrast superdeformed band in 59Cu has been investigated. The firm determination of spin, parity, excitation energy, and configuration of the states involved in this process constitutes a unique situation for a detailed understanding of the decay-out mechanism. A theoretical model is introduced that includes a residual interaction and tunneling matrix element between bands, calculated in the configuration-dependent cranked Nilsson-Strutinsky model. This interaction causes the decay to occur via a small number of observed doorway states. 相似文献
172.
Radiative corrections arising from Lorentz violation in the fermion sector induce a nonzero amplitude for vacuum photon splitting. At one loop, the on-shell amplitude acquires both CPT-even and CPT-odd contributions forbidden in conventional electrodynamics. 相似文献
173.
Popper AN Smith ME Cott PA Hanna BW MacGillivray AO Austin ME Mann DA 《The Journal of the Acoustical Society of America》2005,117(6):3958-3971
Seismic airguns produce considerable amounts of acoustic energy that have the potential to affect marine life. This study investigates the effects of exposure to a 730 in.3 airgun array on hearing of three fish species in the Mackenzie River Delta, the northern pike (Esox lucius), broad whitefish (Coregonus nasus), and lake chub (Couesius plumbeus). Fish were placed in cages in the 1.9 m of water and exposed to five or 20 airgun shots, while controls were placed in the same cage but without airgun exposure. Hearing in both exposed and control fish were then tested using the auditory brainstem response (ABR). Threshold shifts were found for exposed fish as compared to controls in the northern pike and lake chub, with recovery within 24 hours of exposure, while there was no threshold shift in the broad whitefish. It is concluded that these three species are not likely to be substantially impacted by exposure to an airgun array used in a river seismic survey. Care must be taken, however, in extrapolation to other species and to fishes exposed to airguns in deeper water or where the animals are exposed to a larger number of airgun shots over a longer period of time. 相似文献
174.
Reisner W Morton KJ Riehn R Wang YM Yu Z Rosen M Sturm JC Chou SY Frey E Austin RH 《Physical review letters》2005,94(19):196101
The successful design of nanofluidic devices for the manipulation of biopolymers requires an understanding of how the predictions of soft condensed matter physics scale with device dimensions. Here we present measurements of DNA extended in nanochannels and show that below a critical width roughly twice the persistence length there is a crossover in the polymer physics. 相似文献
175.
(Trialkylsilyl)vinylketenes react with lithium ynolates to produce highly substituted phenols in a new benzannulation strategy that proceeds via the 6pi electrocyclization of an intermediate 3-(oxido)dienylketene. [reaction: see text] 相似文献
176.
Svensson CE Macchiavelli AO Juodagalvis A Poves A Ragnarsson I Aberg S Appelbe DE Austin RA Baktash C Ball GC Carpenter MP Caurier E Clark RM Cromaz M Deleplanque MA Diamond RM Fallon P Furlotti M Galindo-Uribarri A Janssens RV Lane GJ Lee IY Lipoglavsek M Nowacki F Paul SD Radford DC 《Physical review letters》2000,85(13):2693-2696
A superdeformed rotational band has been identified in 36Ar, linked to known low-spin states, and observed to its high-spin termination at Ipi = 16(+). Cranked Nilsson-Strutinsky and spherical shell model calculations assign the band to a configuration in which four pf-shell orbitals are occupied, leading to a low-spin deformation beta(2) approximately 0.45. Two major shells are active for both protons and neutrons, yet the valence space remains small enough to be confronted with the shell model. This band thus provides an ideal case to study the microscopic structure of collective rotational motion. 相似文献
177.
178.
A microscopic approach to Fröhlich's theory of Bose condensation in biological systems is discussed. The conclusions from this microscopic analysis offer further support for Fröhlich's hypothesis. 相似文献
179.
180.
Joe Dan Austin 《School science and mathematics》1979,79(2):115-121