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Statistical emission at high excitation energies
ANNALS OF PHYSICS190, 445446 (1989)
Abstracts
Double
of Papers to Appear
in Future
Issues
Gamow-Teller Strength in Nuclei. N. AUERBACH. Physics Department, University of Tel Aviv, 69978 Ramat Aviv, Tel Aviv, Israel; AND L. ZAMICK AND D. C. ZHENG. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855.
The Gamow-Teller transition strength from (N, Z) to (N - 2, Z + 2) nuclei is studied using extended space shell-model calculations. The notion of a giant double Gamow-Teller state is introduced. The application of these ideas to double beta-decay and pion double charge exchange is introduced. A good signature in light-medium mass nuclei of the double Gamow-Teller mechanism in pion double charge exchange from the J = 0 ground state of an eveneven nucleus is the strong excitation of both J = 0 + and J= 2 + states in the final nucleus.
Stafistical
Emission
at High
Excitation
Energies.
WILLIAM A. FRIEDMAN. Physics Department, University
of Wisconsin, Madison, Wisconsin 53706. Two methods for calculating inclusive yields for processes consisting of chains of sequential emissions are discussed. Both are based on partial widths (emission rates) and related branching ratios. One of these, involving detailed simulations of the decay chains, is reformulated to facilitate approximations which are required at high energy where full simulations become impractical. An approximation is discussed and illustrated. The second method, based on time-integration of a specific decay rate, is shown to be closely related to the reformulated simulation method.
Symmetries and Supersymmetries in Nuclear Physics. F. IACHELLO. Center for Theoretical Physics, Sloane Laboratory, and A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511.
The Role of Dynamic
The role played by dynamic symmetries and supersymmetries in nuclear physics is discussed. Experimental examples are shown. The implications to other fields of physics are briefly reviewed.
N-Body
Bound State Relativistic Wave Equations. H. SAZDJIAN.Division de Physique Thtorique, Institut de Physique Nucleaire, Universitb Paris XI, F-91406, Orsay Cedex, France.
The manifestly covariant formalism with constraints is used for the construction of relativistic wave equations to describe the dynamics of N interacting spin 0 and/or spin 4 particles. The total and relative time evolutions of the system are completely determined by means of kinematic-type wave equations. The internal dynamics of the system is 3N-‘-dimensional, in addition to the contribution of the spin degrees of freedom. It is governed by a single dynamical wave equation that determines the eigenvalue of the total mass squared of the system. The interaction is introduced in a closed form by means of twobody potentials. Many-body potentials can also be incorporated.
445 0003-4916189 $7.50 Copyright 0 1989 by Academic Press, Inc. All rights of reproduction in any form reserved.
Abstracts
Double
of Papers to Appear
in Future
Issues
Gamow-Teller Strength in Nuclei. N. AUERBACH. Physics Department, University of Tel Aviv, 69978 Ramat Aviv, Tel Aviv, Israel; AND L. ZAMICK AND D. C. ZHENG. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855.
The Gamow-Teller transition strength from (N, Z) to (N - 2, Z + 2) nuclei is studied using extended space shell-model calculations. The notion of a giant double Gamow-Teller state is introduced. The application of these ideas to double beta-decay and pion double charge exchange is introduced. A good signature in light-medium mass nuclei of the double Gamow-Teller mechanism in pion double charge exchange from the J = 0 ground state of an eveneven nucleus is the strong excitation of both J = 0 + and J= 2 + states in the final nucleus.
Stafistical
Emission
at High
Excitation
Energies.
WILLIAM A. FRIEDMAN. Physics Department, University
of Wisconsin, Madison, Wisconsin 53706. Two methods for calculating inclusive yields for processes consisting of chains of sequential emissions are discussed. Both are based on partial widths (emission rates) and related branching ratios. One of these, involving detailed simulations of the decay chains, is reformulated to facilitate approximations which are required at high energy where full simulations become impractical. An approximation is discussed and illustrated. The second method, based on time-integration of a specific decay rate, is shown to be closely related to the reformulated simulation method.
Symmetries and Supersymmetries in Nuclear Physics. F. IACHELLO. Center for Theoretical Physics, Sloane Laboratory, and A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511.
The Role of Dynamic
The role played by dynamic symmetries and supersymmetries in nuclear physics is discussed. Experimental examples are shown. The implications to other fields of physics are briefly reviewed.
N-Body
Bound State Relativistic Wave Equations. H. SAZDJIAN.Division de Physique Thtorique, Institut de Physique Nucleaire, Universitb Paris XI, F-91406, Orsay Cedex, France.
The manifestly covariant formalism with constraints is used for the construction of relativistic wave equations to describe the dynamics of N interacting spin 0 and/or spin 4 particles. The total and relative time evolutions of the system are completely determined by means of kinematic-type wave equations. The internal dynamics of the system is 3N-‘-dimensional, in addition to the contribution of the spin degrees of freedom. It is governed by a single dynamical wave equation that determines the eigenvalue of the total mass squared of the system. The interaction is introduced in a closed form by means of twobody potentials. Many-body potentials can also be incorporated.
445 0003-4916189 $7.50 Copyright 0 1989 by Academic Press, Inc. All rights of reproduction in any form reserved.