Crossing N=28 Toward the Neutron Drip Line: First Measurement of Half-Lives at FRIB

Crawford, H.  L.; Tripathi, V.; Allmond, J.  M.; Crider, B.  P.; Grzywacz, R.; Liddick, S.  N.; Andalib, A.; Argo, E.; Benetti, C.; Bhattacharya, S.; Campbell, C.  M.; Carpenter, M.  P.; Chan, J.; Chester, A.; Christie, J.; Clark, B.  R.; Cox, I.; Doetsch, A.  A.; Dopfer, J.; Duarte, J.  G.; Fallon, P.; Frotscher, A.; Gaballah, T.; Gray, T.  J.; Harke, J.  T.; Heideman, J.; Heugen, H.; Jain, R.; King, T.  T.; Kitamura, N.; Kolos, K.; Kondev, F.  G.; Laminack, A.; Longfellow, B.; Lubna, R.  S.; Luitel, S.; Madurga, M.; Mahajan, R.; Mogannam, M.  J.; Morse, C.; Neupane, S.; Nowicki, A.; Ogunbeku, T.  H.; Ong, W. -J.; Porzio, C.; Prokop, C.  J.; Rasco, B.  C.; Ronning, E.  K.; Rubino, E.; Ruland, T.  J.; Rykaczewski, K.  P.; Schaedig, L.; Seweryniak, D.; Siegl, K.; Singh, M.; Tabor, S.  L.; Tang, T.  L.; Wheeler, T.; Winger, J.  A.; Xu, Z.

doi:10.1103/physrevlett.129.212501

Crossing N=28 Toward the Neutron Drip Line: First Measurement of Half-Lives at FRIB

Journal Article · Mon Nov 14 00:00:00 EST 2022 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.129.212501· OSTI ID:1898972

^[1]; Tripathi, V. ^[2]; ^[3]; Crider, B. P. ^[4]; ^[5]; Liddick, S. N. ^[6]; Andalib, A. ^[6]; Argo, E. ^[6]; Benetti, C. ^[2]; Bhattacharya, S. ^[2]; Campbell, C. M. ^[1]; Carpenter, M. P. ^[7]; Chan, J. ^[5]; Chester, A. ^[6]; Christie, J. ^[5]; Clark, B. R. ^[4]; Cox, I. ^[5]; Doetsch, A. A. ^[6]; Dopfer, J. ^[6]; Duarte, J. G. ^[8] more »

Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Florida State University, Tallahassee, FL (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Mississippi State University, Mississippi State, MS (United States)
University of Tennessee, Knoxville, TN (United States)
Michigan State University, East Lansing, MI (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Mississippi State University, Mississippi State, MS (United States); Michigan State University, East Lansing, MI (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Louisiana State University, Baton Rouge, LA (United States)

Here, new half-lives for exotic isotopes approaching the neutron drip-line in the vicinity of N~28 for Z=12–15 were measured at the Facility for Rare Isotope Beams (FRIB) with the FRIB decay station initiator. The first experimental results are compared to the latest quasiparticle random phase approximation and shell-model calculations. Overall, the measured half-lives are consistent with the available theoretical descriptions and suggest a well-developed region of deformation below ⁴⁸Ca in the N=28 isotones. The erosion of the Z=14 subshell closure in Si is experimentally confirmed at N=28, and a reduction in the ³⁸Mg half-life is observed as compared with its isotopic neighbors, which does not seem to be predicted well based on the decay energy and deformation trends. This highlights the need for both additional data in this very exotic region, and for more advanced theoretical efforts.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357; AC05-00OR22725; AC52-07NA27344; FG02-96ER40983; NA0003180; NA0003899; NA0003906; SC0014448; SC0020451

OSTI ID:: 1898972

Alternate ID(s):: OSTI ID: 1898152
OSTI ID: 1899907
OSTI ID: 1909643
OSTI ID: 2229604

Report Number(s):: BNL--223720-2022-JAAM; LLNL--JRNL-855261

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 129; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Crossing N=28 Toward the Neutron Drip Line: First Measurement of Half-Lives at FRIB

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