Discovery of the new isotope 251Lr and the α-decay fine structure in 253L

Huang, T.; Seweryniak, D.; Back, B.; Bender, P.; Carpenter, M.; Chowdhury, P.; Clark, R. M.; Copp, P.; He, X.-T.; Herzberg, R.; Hoff, D. E. M.; Jayatissa, H.; Khoo, T. L.; Kondev, F. G.; Morgan, G.; Morse, C.; Korichi, A.; Lauritsen, T.; Muller-Gatermann, C.; Potterveld, D.; Reviol, W.; Rogers, A.; Saha, S.; Savard, G.; Sharma, K.; Stolze, S.; Waniganeththi, S.; Wilson, G.; Wu, J.; Xu, Y.; Zhu, S.

doi:10.1103/physrevc.106.l061301

Title: Discovery of the new isotope ²⁵¹Lr and the α-decay fine structure in ²⁵³L

Journal Article · Thu Dec 01 00:00:00 EST 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.106.l061301· OSTI ID:1906168

Huang, T. ^[1]; Seweryniak, D. ^[2]; Back, B. ^[2]; Bender, P. ^[3]; Carpenter, M. ^[2]; Chowdhury, P. ^[3]; Clark, R. M. ^[4]; Copp, P. ^[2]; He, X.-T. ^[5]; Herzberg, R. ^[6]; Hoff, D. E. M. ^[3]; Jayatissa, H. ^[2]; Khoo, T. L. ^[2]; Kondev, F. G. ^[2]; Morgan, G. ^[7]; Morse, C. ^[4]; Korichi, A. ^[8]; Lauritsen, T. ^[2]; Muller-Gatermann, C. ^[2]; Potterveld, D. ^[2] more »

Chinese Academy of Sciences, Lanzhou (China). Inst. of Modern Physics; Argonne National Laboratory (ANL), Argonne, IL (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Univ. of Massachusetts, Lowell, MA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Nanjing Univ. of Aeronautics and Astronautics (China). College of Materials Science and Tecnology
Univ. of Liverpool (United Kingdom)
Louisiana State Univ., Baton Rouge, LA (United States)
Centre National de la Recherche Scientifique (CNRS), Orsay (France). IN2P3. IJCLab
Nanjing Univ. of Aeronautics and Astronautics, Nanjing (China). College of Materials Science and Technology
Brookhaven National Lab. (BNL), Upton, NY (United States)

The products of the ^{203, 205}Tl (⁵⁰Ti, 2n) fusion-evaporation reactions were studied using the recently commissioned Argonne Gas-Filled Analyzer at Argonne National Laboratory. Two α-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 α 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_α 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 α decay of ²⁵³Lr was studied in more detail and a new α 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, 255}Lr Q_α 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, 255}Lr 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 ϵ₆ was included in the calculations.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0012704; AC02-06CH11357; AC02-05CH11231

OSTI ID:: 1906168

Report Number(s):: BNL-223792-2022-JAAM

Journal Information:: Physical Review. C, Vol. 106, Issue 6; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Discovery of the new isotope ²⁵¹Lr and the α-decay fine structure in ²⁵³L