Abstract
Since magnesium has three isotopes, it might be expected, during disintegration bombardment by
α
-particles, to have the following six reactions : (1
a
) Mg
24
12
+ He
4
2
→ Si
27
14
+
n
1
0
↓ Al
27
13
+
e
0
1
(1
b
) Mg
24
12
+ He
4
2
→ Al
27
13
+ H
1
1
(2
a
) Mg
25
12
+ He
4
2
→ Al
28
13
+ H
1
1
↓ Si
28
14
+
e
0
-1
(2
b
) Mg
25
12
+ He
4
2
→ Si
28
14
+
n
1
0
(3
a
) Mg
26
12
+ He
4
2
→ Al
29
13
+ H
1
1
↓ Si
29
14
+
e
0
-1
(3
b
) Mg
26
12
+ He
4
2
→ Si
29
14
+
n
1
0
In order to obtain information on the structure of these three nuclei of magnesium, especially the nature of the potential barrier, it becomes important to find experimentally the “resonance” levels associated with these reactions. By observing directly the protons emitted from magnesium, Duncanson and Miller (1934) found two levels above an
α
-particle energy of 5.2 × 10
6
e-volts. Since the direct proton (Klarmann 1934) yield is much larger than the total electron yield from Mg
25
and Mg
26
(2
a
) and (3
a
), these two levels seem mainly due to Mg
24
according to (1
b
). On the other hand, Fahlenbrach (1935), investigating the electron emission from magnesium, also found two levels which agree well as to positions with those mentioned above. Recently Ellis and Henderson (1936
a
) have pointed out that all the three magnesium isotopes appear to have similar resonance levels. These previous results will be referred to later. However, many of these points have not been definitely settled, and there is great divergence about the yields. It is, therefore, important to study, if possible, the separate reactions of the individual isotopes.
Reference6 articles.
1. Proc. Roy;Soc. A,1934
2. Proc. Roy;Ilis;Soc. A,1936
3. F a h le n b ra c h 1935
4. K la rm a n n H . 1934
5. Z.Phys. 96 505. Z.Phys. 87 411.
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