dorsal/arxiv
View SchemaPrecise Mass Measurement of the $^{149}$La-$^{149}$Ce-$^{149}$Pr isobaric chain
| Authors | B. Liu, M. Brodeur, J. A. Clark, D. Ray, G. Savard, A. A. Valverde, D. P. Burdette, A. M. Houff, A. Mitra, G. E. Morgan, R. Orford, W. S. Porter, C. Quick, F. Rivero, K. S. Sharma, L. Varriano |
|---|---|
| Categories | |
| ArXiv ID | 2601.09959vv1 |
| URL | https://arxiv.org/abs/2601.09959 |
| License | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
Abstract
Penning trap mass measurements of $^{149}$La, $^{149}$Ce, and $^{149}$Pr were performed with the Canadian Penning Trap (CPT) at the CARIBU facility of Argonne National Laboratory using the phase-imaging ion-cyclotron-resonance technique. The resulting mass excess of $^{149}$La differs by 221 keV from a recent JYFLTRAP measurement, resulting in a significant change in the profile of the two-neutron separation energy for that isotopic chain. The mass excesses of $^{149}$Ce and $^{149}$Pr are determined with an eight-fold improvement in precision compared to previous time-of-flight ion-cyclotron-resonance measurements; the $^{149}$Ce value is consistent with AME2020, while the $^{149}$Pr mass excess is lower by 17.5 keV. The mass excesses of $^{149}$La and $^{149}$Pr reported in this work have been confirmed recently by a measurement with a multi-reflection time-of-flight mass spectrometer coupled to a $\beta$-time of flight detector at RIKEN, providing further validation of the present results.
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"abstract": "Penning trap mass measurements of $^{149}$La, $^{149}$Ce, and $^{149}$Pr were performed with the Canadian Penning Trap (CPT) at the CARIBU facility of Argonne National Laboratory using the phase-imaging ion-cyclotron-resonance technique. The resulting mass excess of $^{149}$La differs by 221 keV from a recent JYFLTRAP measurement, resulting in a significant change in the profile of the two-neutron separation energy for that isotopic chain. The mass excesses of $^{149}$Ce and $^{149}$Pr are determined with an eight-fold improvement in precision compared to previous time-of-flight ion-cyclotron-resonance measurements; the $^{149}$Ce value is consistent with AME2020, while the $^{149}$Pr mass excess is lower by 17.5 keV. The mass excesses of $^{149}$La and $^{149}$Pr reported in this work have been confirmed recently by a measurement with a multi-reflection time-of-flight mass spectrometer coupled to a $\\beta$-time of flight detector at RIKEN, providing further validation of the present results.",
"arxiv_id": "2601.09959",
"authors": [
"B. Liu",
"M. Brodeur",
"J. A. Clark",
"D. Ray",
"G. Savard",
"A. A. Valverde",
"D. P. Burdette",
"A. M. Houff",
"A. Mitra",
"G. E. Morgan",
"R. Orford",
"W. S. Porter",
"C. Quick",
"F. Rivero",
"K. S. Sharma",
"L. Varriano"
],
"categories": [
"nucl-ex"
],
"license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
"title": "Precise Mass Measurement of the $^{149}$La-$^{149}$Ce-$^{149}$Pr isobaric chain",
"url": "https://arxiv.org/abs/2601.09959",
"version": "v1"
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