Some excitation functions of alphas and deuterons on bismuth

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Material Information

Title:
Some excitation functions of alphas and deuterons on bismuth
Series Title:
United States. Atomic Energy Commission. MDDC ;
Physical Description:
2 p. : ill. ; 27 cm.
Language:
English
Creator:
Kelley, E. L
Segré, E
University of California
U.S. Atomic Energy Commission
Publisher:
Technical Information Division, Oak Ridge Directed Operations
Place of Publication:
Oak Ridge, Tenn
Publication Date:

Subjects

Subjects / Keywords:
Bismuth   ( lcsh )
Nuclear excitation   ( lcsh )
Alpha rays   ( lcsh )
Deuterons   ( lcsh )
Genre:
federal government publication   ( marcgt )
technical report   ( marcgt )
non-fiction   ( marcgt )

Notes

Restriction:
"Date Declassified: July 15, 1947"
Statement of Responsibility:
by E.L. Kelley and E. Segré
General Note:
Manhattan District Declassified Code
General Note:
"Date of Manuscript: June 18, 1947"

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 005023697
oclc - 277774027
System ID:
AA00009292:00001


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MDDC 1145







UNITED STATES ATOMIC ENERGY COMMISSION








SOME EXCITATION FUNCTIONS OF ALPHAS AND DEUTERONS ON BISMUTH




by

E. L. Kelly and E. Segre






University of California


This document consists of 2 page.
Date of Manuscript: June 18, 1947
Date Declassified: July 15, 1947



This document Is ior official use.
Its issuance does not constitute authority
for declassification of classified copies
ui Liae mu m us bi m~i arl uniLtiL and Lille
and by the same authorss.





Technical Information Division, Oak Ridge Directed Operations

Oak Ridge, Tennessee


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SOME EXCITATION FUNCTIONS OF ALPHAS AND DEUTERONS ON BISMI3TH


By B. L. Kelly and E. SegrA


As a part of a systematic investigation of excitation functions, the absolute cross sections for the
reactions (o,2n), (a,3n), (d,p), (d,n), and (d,3n) on bismuth will be presented. See graphs. The tech-
nique used is the usual one of bqmbardig stacked foils, with some improvement of the definition of
energy and measurement of current. Thi improvements consisted of a collimating slit system that
produced a beam of 2 per cent straggling or less, and a means of continuously recording the beam
current during bombardment of the stack of foils. The (a,3n) reaction on Bi leading to the formation
of At"' has been identified. At"n has a half-life of 8.3 hr, decaying by K-capture to Poo, accompa-
nied by emission of 1.0-Mev gamma rays. Branching decay of At"o by alpha emission is less than 1
per cent, if it exists.
The integrated mass stopping power of Bi, Cu, Ag, Ta, TI, and U have been redetermined with
respect to Al, using 36-Mev alphas. The tabulated results are listed in Table 1.
The unexpected rise of the (d,n) cross section above 13 Mev is taken to indicate the presence of
the (d,2n) reaction. An attempt will be made to disentangle the (d,2n) cross section and identify the
resulting product.

Table 1.

Integrated mass stopping
Substance Energy range power relative to aluminum

Cu 36-28 0.801
Cu 27-15 0.781

Ag 36-28 0.671
-Ag 27-15 0.650
Ta 36-28 0.548
Ta 27-15 0.516
B 36-6 0.488
Th 36-28 0.505
Th ? 7- n477
U 36-28 0.487
U 27-15 0.472


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ENERGY OF BOMBARDING ALPHAS IN Mev


Figure 1


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ENERGY OF BOMBARDING DEUTERONS IN Mov


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