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Title: New, low-energy excitations in 107Mo and 109Mo

Abstract

New ground-state level with spin-parity 1/2 + is established in 109Mo, 69.8 keV below the previously reported 5/2(+) ground state in this nucleus, based on precise spectroscopy measurements of gamma radiation following spontaneous fission of 248Cm performed using the Eurogam2 array of anti-Compton spectrometers. Analogous measurement of gamma radiation following spontaneous fission of 252Cf, performed using the Gammasphere array, confirms the new 1/2 + ground state of 107Mo, proposed recently and establishes the isomeric character of the 5/2 + first excited state in 107Mo. Two beta-decaying isomers are suggested in 111Mo nucleus based on regular energy systematics, supporting previous predictions. Low-energy excitations in Mo isotopes are interpreted and compared to calculations reported in the literature. The results suggest shape transition from prolate to oblate deformation at N >= 67.

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [1];  [2];  [3];  [3]
  1. Univ. of Warsaw (Poland)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Univ. of Manchester (United Kingdom)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1661665
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 102; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
Electromagnetic transitions; Energy levels & level densities; Nuclear structure & decays; 90 ≤ A ≤ 149

Citation Formats

Urban, W., Rzaca-Urban, T., Wisniewski, J., Kurpeta, J, Plochocki, A., Greene, J. P., Smith, A. G., and Simpson, G. S. New, low-energy excitations in 107Mo and 109Mo. United States: N. p., 2020. Web. doi:10.1103/physrevc.102.024318.
Urban, W., Rzaca-Urban, T., Wisniewski, J., Kurpeta, J, Plochocki, A., Greene, J. P., Smith, A. G., & Simpson, G. S. New, low-energy excitations in 107Mo and 109Mo. United States. doi:10.1103/physrevc.102.024318.
Urban, W., Rzaca-Urban, T., Wisniewski, J., Kurpeta, J, Plochocki, A., Greene, J. P., Smith, A. G., and Simpson, G. S. Fri . "New, low-energy excitations in 107Mo and 109Mo". United States. doi:10.1103/physrevc.102.024318.
@article{osti_1661665,
title = {New, low-energy excitations in 107Mo and 109Mo},
author = {Urban, W. and Rzaca-Urban, T. and Wisniewski, J. and Kurpeta, J and Plochocki, A. and Greene, J. P. and Smith, A. G. and Simpson, G. S.},
abstractNote = {New ground-state level with spin-parity 1/2+ is established in 109Mo, 69.8 keV below the previously reported 5/2(+) ground state in this nucleus, based on precise spectroscopy measurements of gamma radiation following spontaneous fission of 248Cm performed using the Eurogam2 array of anti-Compton spectrometers. Analogous measurement of gamma radiation following spontaneous fission of 252Cf, performed using the Gammasphere array, confirms the new 1/2+ ground state of 107Mo, proposed recently and establishes the isomeric character of the 5/2+ first excited state in 107Mo. Two beta-decaying isomers are suggested in 111Mo nucleus based on regular energy systematics, supporting previous predictions. Low-energy excitations in Mo isotopes are interpreted and compared to calculations reported in the literature. The results suggest shape transition from prolate to oblate deformation at N >= 67.},
doi = {10.1103/physrevc.102.024318},
journal = {Physical Review C},
issn = {2469-9985},
number = 2,
volume = 102,
place = {United States},
year = {2020},
month = {8}
}

Journal Article:
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Works referenced in this record:

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