Establishing the ground-state spin of $^{71}\mathrm{Kr}$

Establishing the ground-state spin of ${}^{71}{Kr}$

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

Phys. Rev. C 106, 044317 – Published 17 October 2022

Abstract

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 ${}^{71}{Kr}$ and ${}^{71}{Br}$ 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 $\log (f t$ ) value of 3.64(4). This is only consistent with both ${}^{71}{Br}$ and ${}^{71}{Kr}$ 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 ${}^{70}{Se}$ was observed for the first time which also strongly supports this assignment.

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Received 13 February 2022
Revised 31 May 2022
Accepted 27 September 2022

DOI:https://doi.org/10.1103/PhysRevC.106.044317

Physics Subject Headings (PhySH)

Beta decay Coulomb energies & analogue states Electroweak interactions in nuclear physics Lifetimes & widths Nuclear spin & parity Proton emission

59 ≤ A ≤ 89

Spectrometers & spectroscopic techniques

Nuclear PhysicsAccelerators & Beams

Authors & Affiliations

S. Waniganeththi ^1,*, D. E. M. Hoff ^1,2, A. M. Rogers ^1,†, C. J. Lister ¹, P. C. Bender¹, K. Brandenburg³, K. Childers^4,5, J. A. Clark⁶, A. C. Dombos^4,7,8, E. R. Doucet¹, S. Jin^4,7,8, R. Lewis^4,5, S. N. Liddick^4,5, Z. Meisel ³, C. Morse^1,9, H. Schatz^4,7,8, K. Schmidt ^4,8,‡, D. Soltesz³, and S. K. Subedi³

¹Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA
²Lawrence Livermore National Laboratory, Livermore, California 94550, USA
³Institute of Nuclear and Particle Physics, Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
⁴National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
⁵Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
⁶Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁷Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
⁸JINA-CEE, Michigan State University, East Lansing, Michigan 48824, USA
⁹National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York 11973, USA

^*Sanjanee_Waniganeththi@student.uml.edu
^†Andrew_Rogers@uml.edu
^‡Present address: Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany 01328.

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Vol. 106, Iss. 4 — October 2022

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Physical Review C

covering nuclear physics

Establishing the ground-state spin of ${}^{71}{Kr}$

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

Phys. Rev. C 106, 044317 – Published 17 October 2022

Abstract

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Physical Review C

covering nuclear physics

Establishing the ground-state spin of Kr71

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

Phys. Rev. C 106, 044317 – Published 17 October 2022

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Establishing the ground-state spin of ${}^{71}{Kr}$