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Title: Evidence for Rigid Triaxial Deformation in Ge 76 from a Model-Independent Analysis

Abstract

An extensive, model-independent analysis of the nature of triaxial deformation in 76Ge, a candidate for neutrinoless double-beta (0νββ) decay, was carried out following multistep Coulomb excitation. Shape parameters deduced on the basis of a rotational-invariant sum-rule analysis provided considerable insight into the underlying collectivity of the ground-state and γ bands. Both sequences were determined to be characterized by the same β and γ deformation parameter values. In addition, compelling evidence for low-spin, rigid triaxial deformation in 76Ge was obtained for the first time from the analysis of the statistical fluctuations of the quadrupole asymmetry deduced from the measured E2 matrix elements. Furthermore, these newly determined shape parameters are important input and constraints for calculations aimed at providing, with suitable accuracy, the nuclear matrix elements relevant to 0νββ.

Authors:
ORCiD logo [1];  [2];  [3];  [2];  [4];  [4];  [1];  [5];  [5];  [6];  [5];  [7];  [8];  [9];  [9];  [10];  [11];  [8];  [5];  [12] more »;  [5];  [5];  [9];  [11];  [5];  [5];  [10];  [5] « less
  1. United States Naval Academy, Annapolis, MD (United States). Dept. of Physics
  2. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Physics and Astronomy; Duke Univ., Durham, NC (United States). Triangle Univ. Nuclear Lab.
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Div.; Brookhaven National Lab. (BNL), Upton, NY (United States). National Nuclear Data Center
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Div.
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States)
  7. Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics and Applied Physics
  8. Univ. of Rochester, Rochester, NY (United States). Dept. of Physics and Astronomy
  9. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Div.
  10. Univ. of Maryland, College Park, MD (United States). Dept. of Chemistry and Biochemistry
  11. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. and Dept. of Physics and Astronomy
  12. Duke Univ., Durham, NC (United States). Triangle Univ. Nuclear Lab. and Dept. of Physics
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1575067
Alternate Identifier(s):
OSTI ID: 1560733; OSTI ID: 1578251
Report Number(s):
LLNL-JRNL-778285
Journal ID: ISSN 0031-9007; PRLTAO; 153280
Grant/Contract Number:  
AC02-06CH11357; AC52-07NA27344; AC02-05CH11231; FG02-97ER41041; FG02-97ER41033; FG02-08ER41556; FG02-94ER40848; FG02-94ER4084; PHY-15655464; PHY-1811855; PHY-1502092
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 10; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Physics - Nuclear physics and radiation physics

Citation Formats

Ayangeakaa, A. D., Janssens, R. V. F., Zhu, S., Little, D., Henderson, J., Wu, C. Y., Hartley, D. J., Albers, M., Auranen, K., Bucher, B., Carpenter, M. P., Chowdhury, P., Cline, D., Crawford, H. L., Fallon, P., Forney, A. M., Gade, A., Hayes, A. B., Kondev, F. G., Krishichayan, ., Lauritsen, T., Li, J., Macchiavelli, A. O., Rhodes, D., Seweryniak, D., Stolze, S. M., Walters, W. B., and Wu, J. Evidence for Rigid Triaxial Deformation in Ge76 from a Model-Independent Analysis. United States: N. p., 2019. Web. doi:10.1103/physrevlett.123.102501.
Ayangeakaa, A. D., Janssens, R. V. F., Zhu, S., Little, D., Henderson, J., Wu, C. Y., Hartley, D. J., Albers, M., Auranen, K., Bucher, B., Carpenter, M. P., Chowdhury, P., Cline, D., Crawford, H. L., Fallon, P., Forney, A. M., Gade, A., Hayes, A. B., Kondev, F. G., Krishichayan, ., Lauritsen, T., Li, J., Macchiavelli, A. O., Rhodes, D., Seweryniak, D., Stolze, S. M., Walters, W. B., & Wu, J. Evidence for Rigid Triaxial Deformation in Ge76 from a Model-Independent Analysis. United States. doi:10.1103/physrevlett.123.102501.
Ayangeakaa, A. D., Janssens, R. V. F., Zhu, S., Little, D., Henderson, J., Wu, C. Y., Hartley, D. J., Albers, M., Auranen, K., Bucher, B., Carpenter, M. P., Chowdhury, P., Cline, D., Crawford, H. L., Fallon, P., Forney, A. M., Gade, A., Hayes, A. B., Kondev, F. G., Krishichayan, ., Lauritsen, T., Li, J., Macchiavelli, A. O., Rhodes, D., Seweryniak, D., Stolze, S. M., Walters, W. B., and Wu, J. Fri . "Evidence for Rigid Triaxial Deformation in Ge76 from a Model-Independent Analysis". United States. doi:10.1103/physrevlett.123.102501.
@article{osti_1575067,
title = {Evidence for Rigid Triaxial Deformation in Ge76 from a Model-Independent Analysis},
author = {Ayangeakaa, A. D. and Janssens, R. V. F. and Zhu, S. and Little, D. and Henderson, J. and Wu, C. Y. and Hartley, D. J. and Albers, M. and Auranen, K. and Bucher, B. and Carpenter, M. P. and Chowdhury, P. and Cline, D. and Crawford, H. L. and Fallon, P. and Forney, A. M. and Gade, A. and Hayes, A. B. and Kondev, F. G. and Krishichayan, . and Lauritsen, T. and Li, J. and Macchiavelli, A. O. and Rhodes, D. and Seweryniak, D. and Stolze, S. M. and Walters, W. B. and Wu, J.},
abstractNote = {An extensive, model-independent analysis of the nature of triaxial deformation in 76Ge, a candidate for neutrinoless double-beta (0νββ) decay, was carried out following multistep Coulomb excitation. Shape parameters deduced on the basis of a rotational-invariant sum-rule analysis provided considerable insight into the underlying collectivity of the ground-state and γ bands. Both sequences were determined to be characterized by the same β and γ deformation parameter values. In addition, compelling evidence for low-spin, rigid triaxial deformation in 76Ge was obtained for the first time from the analysis of the statistical fluctuations of the quadrupole asymmetry deduced from the measured E2 matrix elements. Furthermore, these newly determined shape parameters are important input and constraints for calculations aimed at providing, with suitable accuracy, the nuclear matrix elements relevant to 0νββ.},
doi = {10.1103/physrevlett.123.102501},
journal = {Physical Review Letters},
number = 10,
volume = 123,
place = {United States},
year = {2019},
month = {9}
}

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