Search for Weak Side Branches in the Electromagnetic Decay Paths of the 6526-keV 10+ Isomer in 54Fe

Böhm, Paul; Hrabar, Yuliia; Rudolph, Dirk; Golubev, Pavel; Sarmiento Pico, Luis Gerardo; Albers, Helena M.; Anderson, John T.; Bentley, Michael A.; Carpenter, Michael P.; Chiara, Christopher J.; Copp, Patrick A.; Forsberg, Ulrika; Huang, Tianheng; Jayatissa, Heshani; Lauritsen, Torben; Müller-Gatermann, Claus; Pereira-Lopez, Xesus; Reviol, Walter; Seweryniak, Darek; Stolze, Sanna; Uthayakumaar, Sivahami; Wilson, Gemma L.; Wu, Jin

doi:10.3390/atoms11090116

Title: Search for Weak Side Branches in the Electromagnetic Decay Paths of the 6526-keV 10⁺ Isomer in ⁵⁴Fe

Journal Article · Thu Aug 24 00:00:00 EDT 2023 · Atoms

DOI:https://doi.org/10.3390/atoms11090116· OSTI ID:2205646

Böhm, Paul ^[1];

^[1];

^[1]; Golubev, Pavel ^[1];

^[1];

^[2]; Anderson, John T. ^[3];

^[4]; Carpenter, Michael P. ^[3];

^[5]; Copp, Patrick A. ^[6]; Forsberg, Ulrika ^[7]; Huang, Tianheng ^[3];

^[6];

^[3];

^[8]; Reviol, Walter ^[3]; Seweryniak, Darek ^[3]; Stolze, Sanna ^[3] more »

Lund Univ. (Sweden)
GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Univ. of York (United Kingdom)
Army Research Lab., Adelphi, MD (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Lund Univ. (Sweden); Studsvik AB (Sweden)
Univ. of York (United Kingdom); Institute for Basic Science, Seoul (Korea, Republic of)
Univ. of York (United Kingdom); Michigan State Univ., East Lansing, MI (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States); Louisiana State Univ., Baton Rouge, LA (United States); United Kingdom Atomic Energy Authority (UKAEA), Abingdon (United Kingdom)
Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

High-spin nuclear isomers in $N≈Z$ nuclei between doubly magic ⁴⁰Ca and ⁵⁶Ni provide an excellent testing ground for the nuclear shell model and questions related to isospin symmetry breaking in the vicinity of the proton drip line. The purpose of the present study is to investigate the possibility of weak electromagnetic decay branches along the decay paths of the 6526-keV 10⁺ isomer in ⁵⁴Fe. The isomer was strongly populated by means of the fusion-evaporation reaction ²⁴Mg(³⁶Ar,$$α$$2$$p$$)^54$$m$$Fe. The Gammasphere array was used to detect $$γ$$-ray cascades emitted from the isomeric state. By means of $γγγ$ coincidences, weak non-yrast decay branches can be discriminated, with the isomer’s half-life confirmed at $$T$$_1/2 = 363 (4) ns. The yrast $${6}_{1}^{+}$$ → $${2}_{1}^{+}$$ $E4$ cross-over transition was interrogated. The observations are compared with shell-model calculations.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

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

OSTI ID:: 2205646

Report Number(s):: BNL-224946-2023-JAAM

Journal Information:: Atoms, Vol. 11, Issue 9; ISSN 2218-2004

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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electromagnetic transitions
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Title: Search for Weak Side Branches in the Electromagnetic Decay Paths of the 6526-keV 10⁺ Isomer in ⁵⁴Fe