Triaxiality in selenium-76
Abstract
Background: Selenium and germanium nuclei are associated with both triaxiality and shape coexistence. The relative influence of these deformation effects on the low-lying nuclear structure remains the subject of much discussion with additional attention drawn to 76Se and 76Ge due to the potential for the observation of neutrinoless double- β decay. Purpose: Experimental observables related to the deformation of 76Se are lacking in precision. The purpose of the present paper is to provide electric quadrupole matrix elements with improved precision in order to determine the deformation of low-lying states in a model-independent manner. Methods: Sub-barrier Coulomb excitation was employed at the reaccelerated beam facility of the National Superconducting Cyclotron Laboratory using the JANUS setup. Using this method nineteen E2 matrix elements were extracted. Results: Extracted matrix elements agree within uncertainties with those in the literature but with improved precision. Through both a comparison with geometric models and a model-independent evaluation of E2 matrix elements using rotational invariants, the ground state of 76Se is best described as having a significant triaxial component, but is not maximally triaxially deformed. Conclusions: Selenium-76 exhibits a significant degree of triaxiality in its ground state. Finally, a detailed comparison with configuration-interaction calculations indicates that this canmore »
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., Dept. of Physics and Astronomy
- Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics and Applied Physics
- Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
- OSTI Identifier:
- 1513106
- Alternate Identifier(s):
- OSTI ID: 1512336
- Report Number(s):
- LLNL-JRNL-764282
Journal ID: ISSN 2469-9985; PRVCAN; 954240
- Grant/Contract Number:
- AC52-07NA27344; FG02-08ER41556; NA0003180
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review C
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 5; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
Henderson, J., Wu, C. Y., Ash, J., Brown, B. A., Bender, P. C., Elder, R., Elman, B., Gade, A., Grinder, M., Iwasaki, H., Longfellow, B., Mijatović, T., Rhodes, D., Spieker, M., and Weisshaar, D. Triaxiality in selenium-76. United States: N. p., 2019.
Web. doi:10.1103/PhysRevC.99.054313.
Henderson, J., Wu, C. Y., Ash, J., Brown, B. A., Bender, P. C., Elder, R., Elman, B., Gade, A., Grinder, M., Iwasaki, H., Longfellow, B., Mijatović, T., Rhodes, D., Spieker, M., & Weisshaar, D. Triaxiality in selenium-76. United States. https://doi.org/10.1103/PhysRevC.99.054313
Henderson, J., Wu, C. Y., Ash, J., Brown, B. A., Bender, P. C., Elder, R., Elman, B., Gade, A., Grinder, M., Iwasaki, H., Longfellow, B., Mijatović, T., Rhodes, D., Spieker, M., and Weisshaar, D. Mon .
"Triaxiality in selenium-76". United States. https://doi.org/10.1103/PhysRevC.99.054313. https://www.osti.gov/servlets/purl/1513106.
@article{osti_1513106,
title = {Triaxiality in selenium-76},
author = {Henderson, J. and Wu, C. Y. and Ash, J. and Brown, B. A. and Bender, P. C. and Elder, R. and Elman, B. and Gade, A. and Grinder, M. and Iwasaki, H. and Longfellow, B. and Mijatović, T. and Rhodes, D. and Spieker, M. and Weisshaar, D.},
abstractNote = {Background: Selenium and germanium nuclei are associated with both triaxiality and shape coexistence. The relative influence of these deformation effects on the low-lying nuclear structure remains the subject of much discussion with additional attention drawn to 76Se and 76Ge due to the potential for the observation of neutrinoless double- β decay. Purpose: Experimental observables related to the deformation of 76Se are lacking in precision. The purpose of the present paper is to provide electric quadrupole matrix elements with improved precision in order to determine the deformation of low-lying states in a model-independent manner. Methods: Sub-barrier Coulomb excitation was employed at the reaccelerated beam facility of the National Superconducting Cyclotron Laboratory using the JANUS setup. Using this method nineteen E2 matrix elements were extracted. Results: Extracted matrix elements agree within uncertainties with those in the literature but with improved precision. Through both a comparison with geometric models and a model-independent evaluation of E2 matrix elements using rotational invariants, the ground state of 76Se is best described as having a significant triaxial component, but is not maximally triaxially deformed. Conclusions: Selenium-76 exhibits a significant degree of triaxiality in its ground state. Finally, a detailed comparison with configuration-interaction calculations indicates that this can be well reproduced theoretically.},
doi = {10.1103/PhysRevC.99.054313},
journal = {Physical Review C},
number = 5,
volume = 99,
place = {United States},
year = {Mon May 13 00:00:00 EDT 2019},
month = {Mon May 13 00:00:00 EDT 2019}
}
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