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SUMMARY:Probing the rapid onset of deformation below 68Ni through the beta
  decay of 67Mn
DTSTART;VALUE=DATE-TIME:20240527T162000Z
DTEND;VALUE=DATE-TIME:20240527T164000Z
DTSTAMP;VALUE=DATE-TIME:20260718T003455Z
UID:indico-contribution-23113@indico.ific.uv.es
DESCRIPTION:Speakers: Victoria Vedia (TRIUMF)\nOne of the best-known diver
 gences from the independent-particle shell model description is the existe
 nce of islands of inversion [1]. The IoI of the region N=40 draws particul
 ar attention since the neutron number 40 was postulated as a non-tradition
 al “magic” number and N = 40 represents the boundary between the negat
 ive-parity pf shell and the positive-parity g shell. In stable nuclei\, th
 e\nneutron g$_{9/2}$ orbital is close enough to the pf shell to reduce thi
 s shell gap resulting in a more stable subshell closure at N = 50. Measure
 ments of B(E2) values and E(2$^{+}$) in the neutron-rich region show incre
 ased collectivity through the N = 40 shell gap\, with the clear exception 
 of $^{68}$Ni [2\,3].\nDeformation and shape coexistence have been identifi
 ed in the area\, LNPS calculations predict triple shape coexistence for $^
 {67}$Co (N=40)\, with three rotational bands [4]. And\, recent experiments
  on $^{67}$Fe (N=41) propose a spin-parity of 5/2$^{+}$ or 1/2$^{−}$ for
  its ground state [5] which indicates a significant deformation. In additi
 on\, shape coexistence is also expected for $^{67}$Fe. Despite the high in
 terest in the region\, very limited information is available\, to this end
 \, an experiment was performed at the TRIUMF-ISAC facility utilizing the G
 RIFFIN spectrometer [6]\, where the β and βn decay of $^{67}$Mn populate
 d the $^{67\,66}$Fe\, $^{67\,66}$Co and $^{67\,66}$Ni isotopes.\nThis data
  set contains orders of magnitude more statistics than previous studies al
 lowing us to build for the first time a complete level scheme of $^{67}$Fe
  and $^{67}$Ni\, and to improve upon the known β- decay level schemes of 
 $^{67}$Co\, by expanding the number of transitions and levels\, as well as
  by improving the precision of branching ratios and ground-state half-life
  measurement. In addition\, measurements of level lifetimes down to the pi
 cosecond range will allow us to investigate the band structure in these nu
 clei. For the 67Fe isotope\, a good level of statistics will make it possi
 ble to measure the energy of the identified isomeric state and improve the
  lifetime measurement.\nThese results can provide further insight into the
  structure of the states by comparison to simple models and large-scale sh
 ell model calculations to confirm or refute the shape coexistence picture 
 predicted by LNPS calculations and the shrinking of the N=40 gap just one 
 proton below $^{68}$Ni.\nPreliminary results from the analysis will be pre
 sented and discussed.\nReferences\n[1] B. A. Brown. Physics\, 3:104 (2010)
 .\n[2] S. Naimi et al.\,Phys. Rev. C 86 (2012)\, p. 014325\n[3] M. Hannawa
 ld et al.\, Phys. Rev. Lett. 82 (1999)\, pp. 1391–1394.\n[4] F. Recchia 
 et al.\,Phys. Rev. C\, 85:064305 (2012)\n[5] M. Sawicka et al.\, The Europ
 ean Physical Journal A - Hadrons and Nuclei\, 16(1):51–54\, 2003\n[6] Ga
 rnsworthy et al.\, Nucl. Inst. Meths. A 918\, 9 (2019)\n\nhttps://indico.i
 fic.uv.es/event/7332/contributions/23113/
LOCATION:ADEIT - Valencia
URL:https://indico.ific.uv.es/event/7332/contributions/23113/
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