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Title: Valence proton-neutron interactions throughout the mass surface

Abstract

Empirical average proton-neutron interaction energies, {delta}V{sub pn}, between the last nucleons can be isolated using double differences of masses. We have examined the systematic behavior of {delta}V{sub pn} throughout the mass surface using the 2003 mass table that includes many new and improved experimental masses. The results are especially revealing for self-conjugate nuclei and in regions of strong shell closures in heavy nuclei. In the former the large p-n interaction strength can be interpreted as a consequence of the T=0 interaction between protons and neutrons in spatially similar orbitals. In the latter, the bifurcated systematic can be understood in terms of the evolution of proton and neutron orbital overlaps in regions surrounding a shell closure. In regions between shells, anomalies are sometimes encountered that are not fully understood. They might reflect structural effects or could arise from one or more erroneously measured masses. A scheme based on fractional shell filling is presented that may serve as a signature of shell structure in exotic nuclei. A link between empirical p-n interactions and growth rates of collectivity is pointed out. Finally, our analysis is used to identify candidates for future mass measurements and their needed levels of accuracy, many of which willmore » require new exotic beam facilities.« less

Authors:
 [1];  [2];  [3];  [4];  [3]
  1. Clark University, Worcester, Massachusetts 01610 (United States)
  2. (United States)
  3. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520 (United States)
  4. (Turkey)
Publication Date:
OSTI Identifier:
20771338
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.73.034315; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; HEAVY NUCLEI; MASS; NEUTRONS; NUCLEAR STRUCTURE; PROTON-NEUTRON INTERACTIONS; PROTONS; SHELL MODELS; VALENCE

Citation Formats

Brenner, D.S., Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, Cakirli, R.B., Department of Physics, University of Istanbul, Istanbul, and Casten, R.F. Valence proton-neutron interactions throughout the mass surface. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.034315.
Brenner, D.S., Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, Cakirli, R.B., Department of Physics, University of Istanbul, Istanbul, & Casten, R.F. Valence proton-neutron interactions throughout the mass surface. United States. doi:10.1103/PhysRevC.73.034315.
Brenner, D.S., Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, Cakirli, R.B., Department of Physics, University of Istanbul, Istanbul, and Casten, R.F. Wed . "Valence proton-neutron interactions throughout the mass surface". United States. doi:10.1103/PhysRevC.73.034315.
@article{osti_20771338,
title = {Valence proton-neutron interactions throughout the mass surface},
author = {Brenner, D.S. and Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520 and Cakirli, R.B. and Department of Physics, University of Istanbul, Istanbul and Casten, R.F.},
abstractNote = {Empirical average proton-neutron interaction energies, {delta}V{sub pn}, between the last nucleons can be isolated using double differences of masses. We have examined the systematic behavior of {delta}V{sub pn} throughout the mass surface using the 2003 mass table that includes many new and improved experimental masses. The results are especially revealing for self-conjugate nuclei and in regions of strong shell closures in heavy nuclei. In the former the large p-n interaction strength can be interpreted as a consequence of the T=0 interaction between protons and neutrons in spatially similar orbitals. In the latter, the bifurcated systematic can be understood in terms of the evolution of proton and neutron orbital overlaps in regions surrounding a shell closure. In regions between shells, anomalies are sometimes encountered that are not fully understood. They might reflect structural effects or could arise from one or more erroneously measured masses. A scheme based on fractional shell filling is presented that may serve as a signature of shell structure in exotic nuclei. A link between empirical p-n interactions and growth rates of collectivity is pointed out. Finally, our analysis is used to identify candidates for future mass measurements and their needed levels of accuracy, many of which will require new exotic beam facilities.},
doi = {10.1103/PhysRevC.73.034315},
journal = {Physical Review. C, Nuclear Physics},
number = 3,
volume = 73,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}