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Title: 'FISSION' OF MEDIUM WEIGHT ELEMENTS

Abstract

The fission reaction has been observed with high energy accelerator projectiles for elements as light as tantalum but has not been reported for medium weight elements. The present note presents evidence for the occurrence of reactions which are probably most properly described by the term 'fission' and which seem to occur with very small yield throughout the region where this type of reaction is only slightly exoergic or even endoergic with respect to mass balance. In the course of detailed investigation of the spallation of copper and the variation of the product yields with energy of the bombarding particle the threshold for formation of radioactive Cl{sup 38} (38-minute half-life) from elemental studied. The energetically most economical way in which Cl{sup 38} might be spallation reactions is by emission from the bombarded copper nucleus of nucleons in groups such as alpha-particles instead of single nucleons 0 The energetic requirements for the reaction Cu{sup 63}(p,pn6a)Cl{sup 38}, in which the maximum number of alpha-particles are emitted, include (1) the mass difference between the reactants and the products and (2) the excitation energy which the alpha-particles must have in order to pass over the coulombic barrier, Since the reaction is endoergic with respect tomore » atomic masses, about 50 Mev must be supplied by the impinging proton to make up the mass difference. If the alpha-particles are considered as coming out consecutively, a value of about 50 Mev can be obtained for the coulombic requirement and thus the threshold for this spallation reaction is roughly 100 Mev.« less

Authors:
;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USAEC
OSTI Identifier:
932817
Report Number(s):
UCRL-716
TRN: US200814%%767
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; ALPHA PARTICLES; COPPER; EXCITATION; FISSION; MASS BALANCE; MASS DIFFERENCE; NUCLEONS; PROJECTILES; PROTONS; SPALLATION; TANTALUM

Citation Formats

Batzel., Roger T., and Seaborg, G.T.. 'FISSION' OF MEDIUM WEIGHT ELEMENTS. United States: N. p., 1950. Web. doi:10.2172/932817.
Batzel., Roger T., & Seaborg, G.T.. 'FISSION' OF MEDIUM WEIGHT ELEMENTS. United States. doi:10.2172/932817.
Batzel., Roger T., and Seaborg, G.T.. Mon . "'FISSION' OF MEDIUM WEIGHT ELEMENTS". United States. doi:10.2172/932817. https://www.osti.gov/servlets/purl/932817.
@article{osti_932817,
title = {'FISSION' OF MEDIUM WEIGHT ELEMENTS},
author = {Batzel., Roger T. and Seaborg, G.T.},
abstractNote = {The fission reaction has been observed with high energy accelerator projectiles for elements as light as tantalum but has not been reported for medium weight elements. The present note presents evidence for the occurrence of reactions which are probably most properly described by the term 'fission' and which seem to occur with very small yield throughout the region where this type of reaction is only slightly exoergic or even endoergic with respect to mass balance. In the course of detailed investigation of the spallation of copper and the variation of the product yields with energy of the bombarding particle the threshold for formation of radioactive Cl{sup 38} (38-minute half-life) from elemental studied. The energetically most economical way in which Cl{sup 38} might be spallation reactions is by emission from the bombarded copper nucleus of nucleons in groups such as alpha-particles instead of single nucleons 0 The energetic requirements for the reaction Cu{sup 63}(p,pn6a)Cl{sup 38}, in which the maximum number of alpha-particles are emitted, include (1) the mass difference between the reactants and the products and (2) the excitation energy which the alpha-particles must have in order to pass over the coulombic barrier, Since the reaction is endoergic with respect to atomic masses, about 50 Mev must be supplied by the impinging proton to make up the mass difference. If the alpha-particles are considered as coming out consecutively, a value of about 50 Mev can be obtained for the coulombic requirement and thus the threshold for this spallation reaction is roughly 100 Mev.},
doi = {10.2172/932817},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 29 00:00:00 EDT 1950},
month = {Mon May 29 00:00:00 EDT 1950}
}

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