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SUMMARY:l-forbidden M1 transitions in N = 50 isotones
DTSTART;VALUE=DATE-TIME:20251119T170000Z
DTEND;VALUE=DATE-TIME:20251119T171500Z
DTSTAMP;VALUE=DATE-TIME:20260420T202025Z
UID:indico-contribution-29015@indico.ific.uv.es
DESCRIPTION:Speakers: Gabriel García De Lorenzo (Universidad Complutense 
 de Madrid)\nRegions near closed shells in areas of the nuclear chart far f
 rom stability are very interesting from the point of view of nuclear struc
 ture\, since a  shell model description based on single-particle states ca
 n be challenged by collective effects. One of the most interesting regions
  is the one around the doubly-magic $^{78}$Ni nucleus\, with $Z=28$ and $N
 =50$ [1]\,\n\nThe systematics of transitions from the first-excited to gro
 und states of the odd-$A$ $N=50$ isotones [2\,3] is very enlightening\, si
 nce M1 transitions are expected to be $l$ forbidden\, resulting in long ha
 lf-lives with small transition probabilities [4\,5\,6\,7]. A more complete
  understanding of these $l$ forbidden M1 transition could be achieved by e
 xtending the systematics. To this end\, two complementary experiments were
  performed at the ISOLDE (CERN) facility and ILL reactor in Grenoble\, Fra
 nce.\n\nThe nuclei of interest were populated in  $\\beta$ decay and inves
 tigated by fast-timing techniques. The first experiment was aimed at the s
 tudy the half-life of the first excited state of the $^{83}$As via a $\\be
 ta$-decay experiment of $^{83}$Ga at the ISOLDE Decay Station. \nIn the se
 cond experiment\, the half-lives of the first excited states in $^{85}$Br 
 and $^{87}$Rb [8] were investigated at ILL\, where the parent nuclei\, $^{
 85}$Se and $^{87}$Kr\, were transported and mass-separated by the LOHENGRI
 N is a recoil mass spectrometer.\n\nThe presentation will address the anal
 ysis of both experiments\, discussing the methodologies used and the preli
 minary results obtained. Additionally\, conclusions regarding the systemat
 ics of the $l$-forbidden M1 transitions in $N=50$ isotones will be drawn\,
  highlighting the implications for nuclear structure.\n\nReferences:\n[1] 
 R. Taniuchi et al. “$^{78}$Ni revealed as a doubly magic stronghold agai
 nst nuclear deformation”. En: Nature 569.7754 (2019)\, págs. 53-58. doi
 : https://doi.org/10.48550/\narXiv.1912.05978.\n[2] V. Paziy. “Ultra fas
 t timing study of exotic nuclei around Ni: the β decay chain of $^{81}$Zn
 ”. Tesis doct. Universidad Complutense de Madrid\, 2016.\n[3] P.D. Bond 
 y G.J. Kumbartzki. “Coulomb excitation of $^{85}$Rb and $^{87}$Rb”. En
 :\nNuclear Physics A 205.2 (1973)\, págs. 239-248. issn: 0375-9474. doi: 
 https://doi.\norg/10.1016/0375-9474(73)90207-8.\n[4] R. G. Sachs y M. Ross
 . “Evidence for Non-Additivity of Nucleon Moments”. En:\nPhys. Rev. 84
  (2 oct. de 1951)\, págs. 379-380. doi: 10.1103/PhysRev.84.379.2.\n[5] I.
 M. Govil y C.S. Khurana. “Systematics of l-forbidden M1 transitions”. 
 En:\nNuclear Physics 60.4 (1964)\, págs. 666-671. issn: 0029-5582. doi: h
 ttps://doi.org/\n10.1016/0029-5582(64)90102-6.\n[6] A. B. Volkov. “A Mod
 ified Shell Model of Odd-Even Nuclei”. En: Phys. Rev. 94 (6\njun. de 195
 4)\, págs. 1664-1670. doi: 10.1103/PhysRev.94.1664.\n[7] R. G. Sachs y M.
  Ross. “Evidence for Non-Additivity of Nucleon Moments”. En:\nPhys. Re
 v. 84 (2 oct. de 1951)\, págs. 379-380. doi: 10.1103/PhysRev.84.379.2.\n[
 8] T.D. Johnson y W.D. Kulp. “Nuclear Data Sheets for A = 87”. En: Nuc
 lear Data Sheets\n129 (2015)\, págs. 1-190. issn: 0090-3752. doi: https:/
 /doi.org/10.1016/j.nds.\n2015.09.001.\n\nhttps://indico.ific.uv.es/event/8
 035/contributions/29015/
LOCATION:
URL:https://indico.ific.uv.es/event/8035/contributions/29015/
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