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.
Urban, W., et al. "New, low-energy excitations in <sup>107</sup>Mo and <sup>109</sup>Mo." Physical Review C, vol. 102, no. 2, Aug. 2020. https://doi.org/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. (2020). New, low-energy excitations in <sup>107</sup>Mo and <sup>109</sup>Mo. Physical Review C, 102(2). https://doi.org/10.1103/physrevc.102.024318
Urban, W., Rzaca-Urban, T., Wisniewski, J., et al., "New, low-energy excitations in <sup>107</sup>Mo and <sup>109</sup>Mo," Physical Review C 102, no. 2 (2020), https://doi.org/10.1103/physrevc.102.024318
@article{osti_1661665,
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.},
title = {New, low-energy excitations in <sup>107</sup>Mo and <sup>109</sup>Mo},
annote = {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},
url = {https://www.osti.gov/biblio/1661665},
journal = {Physical Review C},
issn = {ISSN 2469-9985},
number = {2},
volume = {102},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2020},
month = {08}}
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 589, Issue 2https://doi.org/10.1016/j.nima.2008.02.051