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Spherical Model of a Ferromagnet

Spherical Model of a Ferromagnet 70t 6otI 050.- 40 ~~~~~~~~~~ ~~6.95 h MO (P5,9 e X 1 I 10 10.25d Nb9 (p, pn) 1 PROTON ENERGY (Mev) FIG. 2. Relative yields of Mo93 and Nb92 from Nb93+20-Mev protons. irradiated Nb showed the same 290-, 690-, and 1465-kev gammas from Mo as well as the 905-kev ray from 10.2-day Nb92 formed by a (p, pn) reaction. The 7-hr Mo may be formed by either a (p, y), a (p, n), or a (p, 2n) reaction. The first of these alternatives seemed unlikely in view of the 3.7±0.2 Mev reaction threshold observed by Blaser et al.3 However, the possibility of a (p, 2n) reaction remained to be considered. Accordingly, an excitation curve was determined using a stacked foil technique in which one-mil Nb foils were bombarded for 90 minutes with a ca 10 ,ua beam of 20.1-Mev protons. The decay of the beta-activity produced in the Nb foils was resolvable into two periods only-the 6.95-hr Mo and the 10.2-day Nb92. The yield of 6.95-hr Mo when plotted against the incident proton energy (Fig. 2) is seen to reach a maximum at about 11.5 Mev, after which it diminishes with increasing energy. The curve for the http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

Spherical Model of a Ferromagnet

Lewis, H. W; Wannier, G. H
Physical Review , Volume 88 (3) – Nov 1, 1952
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Publisher
American Physical Society (APS)
Copyright
Copyright © 1952 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.88.682.2
Publisher site
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Abstract

70t 6otI 050.- 40 ~~~~~~~~~~ ~~6.95 h MO (P5,9 e X 1 I 10 10.25d Nb9 (p, pn) 1 PROTON ENERGY (Mev) FIG. 2. Relative yields of Mo93 and Nb92 from Nb93+20-Mev protons. irradiated Nb showed the same 290-, 690-, and 1465-kev gammas from Mo as well as the 905-kev ray from 10.2-day Nb92 formed by a (p, pn) reaction. The 7-hr Mo may be formed by either a (p, y), a (p, n), or a (p, 2n) reaction. The first of these alternatives seemed unlikely in view of the 3.7±0.2 Mev reaction threshold observed by Blaser et al.3 However, the possibility of a (p, 2n) reaction remained to be considered. Accordingly, an excitation curve was determined using a stacked foil technique in which one-mil Nb foils were bombarded for 90 minutes with a ca 10 ,ua beam of 20.1-Mev protons. The decay of the beta-activity produced in the Nb foils was resolvable into two periods only-the 6.95-hr Mo and the 10.2-day Nb92. The yield of 6.95-hr Mo when plotted against the incident proton energy (Fig. 2) is seen to reach a maximum at about 11.5 Mev, after which it diminishes with increasing energy. The curve for the

Journal

Physical Review – American Physical Society (APS)

Published: Nov 1, 1952

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