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Title: Simple Interpretation of Proton-Neutron Interactions in Rare Earth Nuclei

Abstract

Empirical values of the average interactions of the last two protons and last two neutrons, {delta}Vpn, which can be obtained from double differences of binding energies, provide significant information about nuclear structure. Studies of {delta}Vpn showed striking behavior across major shell gaps and the relation of proton-neutron (p-n) interaction strengths to the increasing collectivity and onset of deformation in nuclei. Here we focus on the strong regularity at the {delta}Vpn values in A{approx}150-180 mass region. Experimentally, for each nucleus, the valence p-n interaction strengths increase systematically against the neutron number and it decreases for the observed last neutron number. These experimental results give almost nearly perfect parallel trajectories. A microscopic interpretation with a zero range {delta}-interaction in a Nilsson basis gives reasonable agreement for Er-W but more significant discrepancies appear for Gd and Dy.

Authors:
 [1];  [1];  [2];  [2];  [2]
  1. Department of Physics, Istanbul University, Vezneciler, 34459 Istanbul (Turkey)
  2. Wright Nuclear Structure Laboratory, Yale University, New Haven, CT 06520 (United States)
Publication Date:
OSTI Identifier:
21057097
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 899; Journal Issue: 1; Conference: 6. international conference of the Balkan Physical Union, Istanbul (Turkey), 22-26 Aug 2006; Other Information: DOI: 10.1063/1.2733064; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BINDING ENERGY; DEFORMED NUCLEI; DYSPROSIUM; ERBIUM; GADOLINIUM; NEUTRONS; NUCLEAR DEFORMATION; NUCLEAR STRUCTURE; PROTON-NEUTRON INTERACTIONS; PROTONS; RARE EARTH NUCLEI; SHELL MODELS; TUNGSTEN; VALENCE

Citation Formats

Oktem, Y, Cakirli, R B, Wright Nuclear Structure Laboratory, Yale University, New Haven, CT 06520, Casten, R F, Institut fuer Kernphysik, Universitaet zu Koeln, Koeln, Casperson, R J, Brenner, D S, and Department of Chemistry, Clark University, Worcester, MA 01610. Simple Interpretation of Proton-Neutron Interactions in Rare Earth Nuclei. United States: N. p., 2007. Web. doi:10.1063/1.2733064.
Oktem, Y, Cakirli, R B, Wright Nuclear Structure Laboratory, Yale University, New Haven, CT 06520, Casten, R F, Institut fuer Kernphysik, Universitaet zu Koeln, Koeln, Casperson, R J, Brenner, D S, & Department of Chemistry, Clark University, Worcester, MA 01610. Simple Interpretation of Proton-Neutron Interactions in Rare Earth Nuclei. United States. https://doi.org/10.1063/1.2733064
Oktem, Y, Cakirli, R B, Wright Nuclear Structure Laboratory, Yale University, New Haven, CT 06520, Casten, R F, Institut fuer Kernphysik, Universitaet zu Koeln, Koeln, Casperson, R J, Brenner, D S, and Department of Chemistry, Clark University, Worcester, MA 01610. 2007. "Simple Interpretation of Proton-Neutron Interactions in Rare Earth Nuclei". United States. https://doi.org/10.1063/1.2733064.
@article{osti_21057097,
title = {Simple Interpretation of Proton-Neutron Interactions in Rare Earth Nuclei},
author = {Oktem, Y and Cakirli, R B and Wright Nuclear Structure Laboratory, Yale University, New Haven, CT 06520 and Casten, R F and Institut fuer Kernphysik, Universitaet zu Koeln, Koeln and Casperson, R J and Brenner, D S and Department of Chemistry, Clark University, Worcester, MA 01610},
abstractNote = {Empirical values of the average interactions of the last two protons and last two neutrons, {delta}Vpn, which can be obtained from double differences of binding energies, provide significant information about nuclear structure. Studies of {delta}Vpn showed striking behavior across major shell gaps and the relation of proton-neutron (p-n) interaction strengths to the increasing collectivity and onset of deformation in nuclei. Here we focus on the strong regularity at the {delta}Vpn values in A{approx}150-180 mass region. Experimentally, for each nucleus, the valence p-n interaction strengths increase systematically against the neutron number and it decreases for the observed last neutron number. These experimental results give almost nearly perfect parallel trajectories. A microscopic interpretation with a zero range {delta}-interaction in a Nilsson basis gives reasonable agreement for Er-W but more significant discrepancies appear for Gd and Dy.},
doi = {10.1063/1.2733064},
url = {https://www.osti.gov/biblio/21057097}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 899,
place = {United States},
year = {Mon Apr 23 00:00:00 EDT 2007},
month = {Mon Apr 23 00:00:00 EDT 2007}
}