Discovery of the New Isotope {sup 251}Lr: the Impact of the Hexacontetrapole Deformation on Single-Proton Orbital Energies Near the Z = 100 Deformed Shell Gap

Huang, T.; Seweryniak, D.; Back, B. B.; Bender, P.; Carpenter, M. P.; Chowdhury, P.; Clark, R. M.; Copp, P. A.; Herzberg, R. D.; Jayatissa, H.; Khoo, T. L.; Kondev, F. G.; Lauritsen, T.; Müller-Gatermann, C.; Potterveld, D.; Reviol, W.; Savard, G.; Wilson, G. L.; Stolze, S.; Wu, J.

doi:10.1103/PhysRevC.106.L061301

Title: Discovery of the New Isotope {sup 251}Lr: the Impact of the Hexacontetrapole Deformation on Single-Proton Orbital Energies Near the Z = 100 Deformed Shell Gap

Journal Article · Thu Dec 01 00:00:00 EST 2022 · Physical Review C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.106.L061301· OSTI ID:1909022

Huang, T.; Seweryniak, D.; Back, B. B.; Bender, P.; Carpenter, M. P.; Chowdhury, P.; Clark, R. M.; Copp, P. A.; Herzberg, R. D.; Jayatissa, H.; Khoo, T. L.; Kondev, F. G.; Lauritsen, T.; Müller-Gatermann, C.; Potterveld, D.; Reviol, W.; Savard, G.; Wilson, G. L.; Stolze, S.; Wu, J.

The products of the 203,205Tl(50Ti, 2n) fusion-evaporation reactions were studied using the recently commissioned Argonne Gas-Filled Analyzer at Argonne National Laboratory. Two alpha-decay activities with energies of 9210(19) and 9246(19) keV and half-lives of 42+42-14 and 24.4+7.0 -4.5 ms were observed which were followed by the known alpha decays of 247Md and 243Es. They are interpreted as originating from the 1/2-[521] and 7/2-[514] single-proton Nilsson states in the hitherto unknown isotope 251Lr. From the measured Q alpha values the 1/2- level was placed 117(27) keV above the 7/2- level in 251Lr in contrast to 255Lr where the 1/2- level is the lowest. Also, the alpha decay of 253Lr was studied in more detail and a new alpha line at 8660(20) keV was found and a new half-life value of 2.46(32) s for an isomeric state in 253Lr was measured. The 251,253,255Lr Q alpha values were compared with predictions of various mass models. The relative energies of the 1/2-[521] and 7/2-[514] single-proton Nilsson states in 251,253,255Lr isotopes were compared with results of the cranking shell model with pairing treated using the particle-number-conserving method. The level separation and, in particular, the level order change between 251Lr and 255Lr was reproduced only when the hexacontetrapole deformation epsilon 6 was included in the calculations.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science - Office of Nuclear Physics

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1909022

Journal Information:: Physical Review C, Nuclear Physics, Vol. 106, Issue 6

Country of Publication:: United States

Language:: English

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