Prompt Gamma Rays Accompanying the Spontaneous Fission ofCf252

Abstract

699 event were of high energy. A subsequent investigation employing apparatus primarily designed to measure electron velocity spectra is contemplated. Such spectra are of interest because according to the Weizel-Beeck theory of ionization by ions, a quasi molecule is formed during an ionizing collision, and it seems likely that the 1 M. Deutsch and J. Rotblat, Atomic Energy Commission Report .

Multiplicity and correlated energy of gamma rays emitted in the spontaneous fission of Californium-252

“…As another point of comparison, Smiuh et al [2] estimated that there were 5.0 gammas per fission between 0.5 and 2.3 MeV. We can estimate from Table I We turn now to the work of Ramamurthy et al, [12] In the present work, this has been found to be a serious source of bias if not properly adjusted.…”

“…For example, the threshold for the first entry (Smith) [2] was inferred approximately from the remark that a small photopeak was detected near 60 keV. The threshold for the second entry was inferred from the left-hand-most point in Figure 6 of Refer¬ ence 3.…”

“…There are five available measurements of n, the average number of 252 gammas emitted in the spontaneous fission of Cf [2][3][4][5][6] and only one reference dealing with the characteristics of the emission probability distribution. [12] The measurements of n are summarized in Table 1 in¬ sofar as they can be determined from the references.…”

“…[2][3][4][5][6] The number ranges from approximately 7 to 10. The literature on this point is reviewed in detail in a separate section.…”

Tailoring the Neutron Spectrum from a 14-MeV Neutron Generator to Approximate a Spontaneous-Fission Spectrum

“…Isotopic sources also produce photons: 252 Cf produces ~10 Ȗ/n [7] and AmBe produces ~0.6 Ȗ/n from fission [8]. An AmBe source also produces many lower energy photons from the natural decay of Am; these photons are not associated with neutron production.…”