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Title: Mapping quadrupole collectivity in the Cd isotopes: The breakdown of harmonic vibrational motion

Abstract

The stable Cd isotopes have long been used as paradigms for spherical vibrational motion. Extensive investigations with in-beam {gamma} spectroscopy have resulted in very-well-established level schemes, including many lifetimes or lifetime limits. A programme has been initiated to complement these studies with very-high-statistics {beta} decay using the 8{pi} spectrometer at the TRIUMF radioactive beam facility. The decays of {sup 112}In and {sup 112}Ag have been studied with an emphasis on the observation of, or the placement of stringent limits on, low-energy branches between potential multi-phonon levels. A lack of suitable 0{sup +} or 2{sup +} three-phonon candidates has been revealed. Further, the sum of the B(E2) strength from spin 0{sup +} and 2{sup +} states up to 3 MeV in excitation energy to the assigned two-phonon levels falls far short of the harmonic-vibrational expectations. This lack of strength points to the failing of collective models based on vibrational phonon structures.

Authors:
 [1]; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]; ;  [2]; ; ;  [3]
  1. Department of Physics, University of Guelph, Guelph, Ontario, N1G2W1 (Canada)
  2. Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia, B3H3C3 (Canada)
  3. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T2A3 (Canada)
Publication Date:
OSTI Identifier:
21612052
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1377; Journal Issue: 1; Conference: FINUSTAR 3 Conference on frontiers in nuclear structure, astrophysics, and reactions, Rhodes (Greece), 23-27 Aug 2010; Other Information: DOI: 10.1063/1.3628381; (c) 2011 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; BETA DECAY; BOSONS; CADMIUM ISOTOPES; COLLECTIVE MODEL; E2-TRANSITIONS; ENERGY LEVELS; EXCITATION; HARMONIC OSCILLATORS; IN-BEAM SPECTROSCOPY; INDIUM 112; LIFETIME; MEV RANGE; NUCLEAR POTENTIAL; SILVER 112; SPHERICAL CONFIGURATION; SPIN; VIBRATIONAL STATES; ANGULAR MOMENTUM; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; CONFIGURATION; DECAY; ELECTRON CAPTURE RADIOISOTOPES; ENERGY RANGE; ENERGY-LEVEL TRANSITIONS; EXCITED STATES; HOURS LIVING RADIOISOTOPES; INDIUM ISOTOPES; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTOPES; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MATHEMATICAL MODELS; MINUTES LIVING RADIOISOTOPES; MULTIPOLE TRANSITIONS; NUCLEAR DECAY; NUCLEAR MODELS; NUCLEI; ODD-ODD NUCLEI; PARTICLE PROPERTIES; POTENTIALS; RADIOISOTOPES; SILVER ISOTOPES; SPECTROSCOPY

Citation Formats

Garrett, P E, TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T2A3, Green, K L, Bangay, J, Varela, A Diaz, Sumithrarachchi, C S, Bandyopadhyay, D S, Bianco, L, Demand, G A, Finlay, P, Grinyer, G F, Leach, K G, Phillips, A A, Schumaker, M A, Svensson, C E, Wong, J, Austin, R A. E., Colosimo, S, Ball, G C, Garnsworthy, A B, and Hackman, G. Mapping quadrupole collectivity in the Cd isotopes: The breakdown of harmonic vibrational motion. United States: N. p., 2011. Web. doi:10.1063/1.3628381.
Garrett, P E, TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T2A3, Green, K L, Bangay, J, Varela, A Diaz, Sumithrarachchi, C S, Bandyopadhyay, D S, Bianco, L, Demand, G A, Finlay, P, Grinyer, G F, Leach, K G, Phillips, A A, Schumaker, M A, Svensson, C E, Wong, J, Austin, R A. E., Colosimo, S, Ball, G C, Garnsworthy, A B, & Hackman, G. Mapping quadrupole collectivity in the Cd isotopes: The breakdown of harmonic vibrational motion. United States. https://doi.org/10.1063/1.3628381
Garrett, P E, TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T2A3, Green, K L, Bangay, J, Varela, A Diaz, Sumithrarachchi, C S, Bandyopadhyay, D S, Bianco, L, Demand, G A, Finlay, P, Grinyer, G F, Leach, K G, Phillips, A A, Schumaker, M A, Svensson, C E, Wong, J, Austin, R A. E., Colosimo, S, Ball, G C, Garnsworthy, A B, and Hackman, G. 2011. "Mapping quadrupole collectivity in the Cd isotopes: The breakdown of harmonic vibrational motion". United States. https://doi.org/10.1063/1.3628381.
@article{osti_21612052,
title = {Mapping quadrupole collectivity in the Cd isotopes: The breakdown of harmonic vibrational motion},
author = {Garrett, P E and TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T2A3 and Green, K L and Bangay, J and Varela, A Diaz and Sumithrarachchi, C S and Bandyopadhyay, D S and Bianco, L and Demand, G A and Finlay, P and Grinyer, G F and Leach, K G and Phillips, A A and Schumaker, M A and Svensson, C E and Wong, J and Austin, R A. E. and Colosimo, S and Ball, G C and Garnsworthy, A B and Hackman, G},
abstractNote = {The stable Cd isotopes have long been used as paradigms for spherical vibrational motion. Extensive investigations with in-beam {gamma} spectroscopy have resulted in very-well-established level schemes, including many lifetimes or lifetime limits. A programme has been initiated to complement these studies with very-high-statistics {beta} decay using the 8{pi} spectrometer at the TRIUMF radioactive beam facility. The decays of {sup 112}In and {sup 112}Ag have been studied with an emphasis on the observation of, or the placement of stringent limits on, low-energy branches between potential multi-phonon levels. A lack of suitable 0{sup +} or 2{sup +} three-phonon candidates has been revealed. Further, the sum of the B(E2) strength from spin 0{sup +} and 2{sup +} states up to 3 MeV in excitation energy to the assigned two-phonon levels falls far short of the harmonic-vibrational expectations. This lack of strength points to the failing of collective models based on vibrational phonon structures.},
doi = {10.1063/1.3628381},
url = {https://www.osti.gov/biblio/21612052}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1377,
place = {United States},
year = {Fri Oct 28 00:00:00 EDT 2011},
month = {Fri Oct 28 00:00:00 EDT 2011}
}