Determination of the sign and magnitude of the nuclear quadrupole interaction by $beta$$-$$gamma$ directional correlations

Journal Article · Mon Dec 01 04:00:00 EST 1975 · Phys. Rev., C, v. 12, no. 6, pp. 2022-2032

OSTI ID:4105022

Raghavan, R S; Raghavan, P; Kaufmann, E N

Experiments are reported which demonstrate that the sign and magnitude of the quadrupole interaction of excited nuclear states can be reliably determined by means of time-differential $beta$$-$$gamma$ directional correlations with radioactive sources embedded in noncubic single crystals. The 828 keV level of $sup 115$In and the 247 keV level of $sup 111$Cd, fed by an allowed and a unique first-forbidden $beta$ decay, respectively, have been investigated by this method. The coupling constants e$sup 2$qQ of these levels in Cd metal at 298 degree K are: -146(5) MHz for $sup 115$In and +125(4) MHz for $sup 111$Cd. The positive coupling constant for $sup 111$Cd in Cd coupled with a positive quadrupole moment Q of this level implies a positive electric field gradient in Cd confirming recent theoretical predictions. The negative e$sup 2$qQ for the $sup 115$In level in Cd metal correspondingly indicates a negative Q for this level in conformity with its description as a member of a K = 1/2 rotational band. The paper includes a discussion of the major concepts underlying the various methods available now for determination of the sign of e$sup 2$qQ. Also, a detailed account of theoretical formulas necessary to evaluate allowed and forbidden $beta$$-$$gamma$ perturbed angular correlations and a brief discussion of the significance of the technique for further studies of nuclear quadrupole effects in materials are given. (AIP)

• Research Organization: Bell Laboratories, Murray Hill, New Jersey 07974
• NSA Number: NSA-33-019054
• OSTI ID: 4105022
• Journal Information: Phys. Rev., C, v. 12, no. 6, pp. 2022-2032, Journal Name: Phys. Rev., C, v. 12, no. 6, pp. 2022-2032; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

642704*
BETA- MINUS DECAY-- CADMIUM 111-- SILVER 111
BETA-MINUS DECAY-- CADMIUM 115-- INDIUM 115
CADMIUM
COUPLING CONSTANTS
N68731 --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
90 <= A <= 149--Energy Levels & Transitions
N68741 --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
90 <= A <= 149--Moments & Spin
N68742* --Physics (Nuclear
Theoretical)--Nuclear Properties & Reactions
90 <= A <= 149--Moments & Spin
PERTURBED ANGULAR CORRELATION CADMIUM 111-- INDIUM 115-- QUADRUPOLE MOMENTS