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The K-shell X-ray fluorescence cross sections are determined experimentally for 10 elements such as Pb, Hg, Ir, W, Lu, Tm,
Dy, Tb, Gd and Nd at excitation energy of 661.6 keV associated with γ-rays of 137Cs radioisotope. The technique employed involves the measurement of total intensity of fluorescent K X-rays that follow the
photoeffect absorption of a known flux of γ-rays using a well type Nal(Tl) detector. The obtained results are compared with the available theoretical values and other
measured values. 相似文献
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Barrette J Bellwied R Braun-Munzinger P Cleland WE David G Duek E Fatyga M Fox D Gavron A Greene SV Hall J Hemmick TK Heifetz R Herman M Herrmann N Hogue RW Ingold G Jayananda K Kraus D Lissauer D Llope WJ Legault A Ludlam T Majka R Makowiecki D Mark SK Mitchell JT Muthuswamy M O'Brien E Olsen L Polychronakos V Rawool-Sullivan M Rotondo F Sandweiss J Shivakumar B Simon J Sonnadara U Sullivan JP Stachel J Sunier J Takai H Throwe T Van Hecke H Waters L Woody C Wolf K Wolfe D 《Physical review letters》1990,64(11):1219-1222
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In vitro produced bovine embryos were frozen by pellet freezing or vitrification method. In the pellet freezing method, the embryos were cooled on the dry ice and then frozen as pellets. At warming, the pellets were immersed directly into 0.5 M sucrose. The survival rates of blastocysts frozen by the pellet freezing method were higher (P<0.01) in 40% ethylene glycol (EG) than those in the lower concentrations (20 and 30% EG). Higher survival rates of blastocysts frozen by the pellet freezing method were obtained but the development rates did not differ, as compared with those by the vitrification method. There were no significant differences between the pellet freezing and vitrification method in the frequencies of post-thaw survival of hatched blastocysts. These results demonstrate that the pellet freezing method using dry ice can be used successfully for the cryopreservation of blastocysts. 相似文献
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J. Barrette R. Bellwied P. Braun-Munzinger W. E. Cleland T. M. Cormier G. David J. Dee G. E. Diebold O. Dietzsch J. V. Germani S. Gilbert S. V. Greene J. R. Hall T. K. Hemmick N. Herrmann B. Hong K. Jayananda D. Kraus B. Shiva Kumar R. Lacasse D. Lissauer W. J. Llope T. W. Ludlam S. McCorkle R. Majka S. K. Mark J. T. Mitchell M. Muthuswamy E. O'Brien C. Pruneau M. N. Rao F. Rotondo J. Sandweiss N. C. daSilva U. Sonnadara J. Stachel H. Takai E. M. Takagui T. G. Throwe C. Winter G. Wang D. Wolfe C. L. Woody N. Xu Y. Zhang Z. Zhang C. Zou 《Zeitschrift fur Physik C Particles and Fields》1993,59(2):211-214
We have measured distributions in transverse momentum and rapidity of protons from interactions of 14.6 GeV/nucleon28Si projectiles with targets of Al and Pb. The transverse momentum spectra exhibit a thermal shape with a rapidity dependent temperature parameter. For very central or violent collisions the proton rapidity distributions exhibit the large rapidity shifts and (for Si+Al) a peak at midrapidity as required for full stopping. 相似文献
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Barrette J Bellwied R Braun-Munzinger P Cleland WE Cormier T Dadusc G David G Dee J Diebold GE Dietzsch O Duek E Fatyga M Fox D Greene SV Germani JV Hall JR Hemmick TK Herrmann N Hogue RW Hong B Jayananda K Kraus D Kumar BS Lacasse R Lissauer D Llope WJ Ludlam TW Majka R Makowiecki D Mark SK Mitchell JT Muthuswamy M O'Brien E Pruneau C Rotondo FS Sandweiss J da Silva NC Simon-Gillo J Slaughter J Sonnadara U Stachel J Takai H Takagui EM Throwe TG Waters L Winter C Wolf K Wolfe D Woody CL Xu N 《Physical review letters》1993,70(12):1763-1766
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Barrette J Bellwied R Bennett S Braun-Munzinger P Cleland WE Clemen M Cole J Cormier TM David G Dee J Dietzsch O Drigert M Gilbert S Hall JR Hemmick TK Herrmann N Hong B Jiang CL Kwon Y Lacasse R Lukaszew A Li Q Ludlam TW McCorkle S Mark SK Matheus R O'Brien E Panitkin S Piazza T Pruneau C Rao MN Rosati M daSilva NC Sedykh S Sonnadara U Stachel J Takai H Takagui EM Voloshin S Wang G Wessels JP Woody CL Xu N Zhang Y Zhang Z Zou C 《Physical review letters》1994,73(19):2532-2535
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Barrette J Bellwied R Bennett S Braun-Munzinger P Cleland WE Cormier TM David G Dee J Diebold GE Dietzsch O Fox D Germani JV Gilbert S Greene SV Hall JR Hemmick TK Herrmann N Hong B Jayananda K Kraus D Kumar BS Lacasse R Li Q Lissauer D Llope WJ Ludlam TW McCorkle S Majka R Mark SK Matheus R Mitchell JT Muthuswamy M O'Brien E Panitkin S Pruneau C Rao MN Rosati M Rotondo F daSilva NC Simon-Gillo J Sonnadara U Stachel J Sullivan J Takai H Takagui EM Throwe TG Winter C Wang G Wolf KL Wolfe D 《Physical review letters》1993,70(20):2996-2999
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