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One of two or more atoms which display a constant difference A - Z between their mass number A and their atomic number Z. Thus, despite differences in the total number of nuclear constituents, the numbers of neutrons in the nuclei of isotones are the same. The numbers of naturally occurring isotones provide useful evidence concerning the stability of particular neutron configurations. For example, the relatively large number (six and seven, respectively) of naturally occurring 50- and 82-neutron isotones suggests that these nuclear configurations are especially stable. On the other hand, from the fact that most atoms with odd numbers of neutrons are anisotonic, one may conclude that odd-neutron configurations are relatively unstable. See Nuclear structure

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.


(nuclear physics)
One of several nuclides having the same number of neutrons in their nuclei but differing in the number of protons.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
(2) [??]: P x P [right arrow] P is isotone on first variable and antitone on second variable.
In this section, we prove common fixed point theorems for a pair of weakly isotone increasing multivalued mappings under general weak contractive condition.
Para a regressao isotonica com pesos iguais, utilizou-se a funcao isoreg do pacote isotone, e, para a ponderada, ou seja, com pesos diferentes, utilizou-se a funcao cirpava do pacote cir (R DEVELOPMENT CORE TEAM, 2010).
Theorem 2.6: Let S,T be inverse semigroups and f,g are continuous isotone maps from S into T.
Other topics addressed include asymptotic oracle properties of SCAD-penalized least squares estimators, critical scaling of stochastic epidemic models, additive isotone regression, and Talagrand's convex hull concentration inequality.
The accurate dosing of two dispensers from Rieke Packaging Systems Englass were key to their selection by leading Swiss sports nutrition manufacturer WinForce for the dispensing of its "all natural" isotonic drink Isotone, Isotone--available in pomegranate-lime and lemon-juniper flavours--contains no additives, such as stabilisers, preservatives or sweeteners.
The fluid that was placed into the test reservoir was obtained from the original fluid by diluting the original fluid about 500 times using Isotone fluid.
2.2 Definition A set of possible worlds, seen as a function f: [2.sup.n][right arrow]2, is called positive or isotone if f preserves the order.
[psi] is called isotone if x,y [member of] [H.sub.1], x[[less than or equal to].sub.1] y implies [psi](x) [[less than or equal to].sub.2] [psi](y).
(E2) (L, [encircled dot], 1) is a commutative monoid and [encircled dot] is isotone with respect to [less than or equal to];
Another advantage of this method is that the operator in the finite element problem is diagonally isotone and off-diagonally antitone and thereby some monotone convergent algorithms can be applied (see, e.g., [13, 14]).
Fujimoto: An extension of Tarski's fixed point theorem and its application to isotone complementarity problems, Math.