Experimental study of Long Range Alpha particles emitted during spontaneous fission of [sup 238,240,242,244]Pu isotopes

1998 ◽  
Author(s):  
C. Wagemans ◽  
O. Serot
Keyword(s):  
Experimental Study ◽  
Long Range ◽  
Spontaneous Fission ◽  
Alpha Particles ◽  
Pu Isotopes

Transmission mechanisms of NMR long-range J(13C,19F) scalar couplings in 1-F,4-X-cubanes: a DFT and experimental study

2006 ◽  
Vol 104 (4) ◽  
pp. 485-492 ◽  
Author(s):  
RubéN H. Contreras ◽  
Ángel L. Esteban ◽  
Ernesto DÍez ◽  
Nicholas J. Head ◽  
Ernest W. Della
Keyword(s):  
Experimental Study ◽  
Long Range ◽  
Scalar Couplings ◽  
Transmission Mechanisms

XVIII.—The Emission of Long-Range Alpha Particles in Fission

1963 ◽  
Vol 66 (3) ◽  
pp. 192-209
Author(s):  
N. Feather
Keyword(s):  
Long Range ◽  
Alpha Particle ◽  
Experimental Tests ◽  
Alpha Particles ◽  
Ternary Fission ◽  
Neutron Excess ◽  
Final Energy ◽  
Open Question

It is generally agreed that the long-range alpha particles of fission are set free before the fragment nuclei have acquired more than a small fraction of their final energy of separation, but whether the alpha particle is liberated before the instant of scission, at that instant, or from one of the fragment nuclei very shortly thereafter, has remained an open question. Each of these views has been seriously advocated. These various hypotheses are examined in relation to recently published information regarding the distribution of mass in low-eneigy ternary fission, and other considerations, and it is suggested that the hypothesis having the strongest claim to attention is that which assumes that the alpha particles originate in the heavy fragments exclusively, being liberated, very shortly after the instant of scission, with probability not much less than unity, from fragment nuclei of low yield and small neutron excess. Conclusions which would follow, if this hypothesis were accepted, are indicated, and possible experimental tests of these conclusions are suggested.

The Adoption of the Bow and Arrow: A Model Based on Experimental Performance Characteristics

2013 ◽  
Vol 78 (3) ◽  
pp. 553-569 ◽  
Author(s):  
Steve A. Tomka
Keyword(s):  
Experimental Study ◽  
Long Range ◽  
New World ◽  
Prey Species ◽  
Game Species ◽  
Experimental Performance ◽  
Hunting Strategies ◽  
Bow And Arrow ◽  
Game Hunting ◽  
Over Time

AbstractThe timing of the arrival of the bow and arrow in the New World and reasons for its adoption have long been discussed by archaeologists. It typically has been assumed that the bow and arrow provided mechanical and physical advantages over the atlatl and dart, particularly in long-range killing power. This experimental study examines the effectiveness of traditional bows and arrows to deliver lethal wounds to prey species of different sizes. The results suggest that the bow and arrow was effective in hunting prey species such as antelope and deer but ineffective in bringing down larger animals unless changes in hunting strategies were adopted. In contrast, the atlatl and dart would have excelled in large game hunting. It is proposed that the adoption of the bow and arrow and the abandonment of the atlatl and dart were conditioned by their distinct performance advantages and changes in the game species targeted over time.

Spontaneous fission of Cm244 with emission of a long-range alpha particle

1964 ◽  
Vol 16 (2) ◽  
pp. 170-171 ◽  
Author(s):  
L. Z. Malkin ◽  
I. D. Alkhazov ◽  
A. S. Krisvokhatskii ◽  
K. A. Petrzhak ◽  
L. M. Belov
Keyword(s):  
Long Range ◽  
Alpha Particle ◽  
Spontaneous Fission
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