Establishing the ground-state spin of 71Kr

Waniganeththi, S.; Hoff, D. E. M.; Rogers, A. M.; Lister, C. J.; Bender, P. C.; Brandenburg, K.; Childers, K.; Clark, J. A.; Dombos, A. C.; Doucet, E. R.; Jin, S.; Lewis, R.; Liddick, S. N.; Meisel, Z.; Morse, C.; Schatz, H.; Schmidt, K.; Soltesz, D.; Subedi, S. K.

doi:10.1103/physrevc.106.044317

Establishing the ground-state spin of ⁷¹Kr

Journal Article · Mon Oct 17 00:00:00 EDT 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.106.044317· OSTI ID:1896879

^[1]; ^[2]; ^[1]; ^[1]; Bender, P. C. ^[1]; Brandenburg, K. ^[3]; Childers, K. ^[4]; Clark, J. A. ^[5]; Dombos, A. C. ^[4]; Doucet, E. R. ^[1]; Jin, S. ^[4]; Lewis, R. ^[4]; Liddick, S. N. ^[4]; ^[3]; Morse, C. ^[6]; Schatz, H. ^[4]; ^[4]; Soltesz, D. ^[3]; Subedi, S. K. ^[3]

Univ. of Massachusetts, Lowell, MA (United States)
Univ. of Massachusetts, Lowell, MA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Ohio Univ., Athens, OH (United States)
Michigan State Univ., East Lansing, MI (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Massachusetts, Lowell, MA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Nuclei in the vicinity of the N=Z line provide many sensitive probes of isospin symmetry. One example concerns the character and sequence of low-lying states of the T=1/2 mirror pair ⁷¹Kr and ⁷¹Br which has been under debate for several decades. In this paper we report a new measurement of the absolute β-branching to ground and excited states which, taken with our precise lifetime of T_1/2=94.9(4) ms , gives a superallowed ground state–to–ground state log (ft) value of 3.64(4). This is only consistent with both ⁷¹Br and ⁷¹Kr having the same spin and parity, J^π=5/2^–, as expected from mirror symmetry. The β-delayed proton emission to the first-excited state in ⁷⁰Se was observed for the first time which also strongly supports this assignment.

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)

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

Grant/Contract Number:: AC02-06CH11357; AC52-07NA27344; FG02-88ER40387; FG02-94ER40848; NA0000979; NA0002132; NA0003180; NA0003221; NA0003909; SC0012704; SC0019042

OSTI ID:: 1896879

Report Number(s):: BNL-223638-2022-JAAM

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 4 Vol. 106; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Establishing the ground-state spin of ⁷¹Kr