BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Nuclear processes and effective weak couplings
DTSTART;VALUE=DATE-TIME:20200224T073000Z
DTEND;VALUE=DATE-TIME:20200224T080000Z
DTSTAMP;VALUE=DATE-TIME:20260516T115219Z
UID:indico-contribution-1499@indico.tlabs.ac.za
DESCRIPTION:Speakers: Jouni Suhonen (University of Jyväskylä)\nThe axial
 -type of weak couplings seem to be renormalized in medium-heavy and heavy 
 nuclei as suggested by analyses of nuclear beta and double beta decays\, n
 uclear muon capture\, charge-exchange reactions and low-energy neutrino-nu
 cleus scattering [1]. Also some calculations suggest that also the vector-
 type of couplings could attain effective values in nuclei [2\,3]. The poss
 ible variation of the values of weak couplings as functions of the nuclear
  mass number affects the information deduced from the possible future meas
 urements of the half-lives of neutrinoless double beta ($0\\nu\\beta\\beta
 $) decays [4]\,\nnuclear muon captures\, electron and antineutrino spectra
  of medium-mass fission fragments in nuclear reactors\, etc. In particular
 \, there could be direct effects on the reactor antineutrino anomaly and t
 he Gallium anomaly [1]. \n\nStudies of the $0\\nu\\beta\\beta$ decays of n
 uclei are of paramount importance in order to learn about the basic proper
 ties of the neutrino. An appealing way to probe this decay rather directly
  is the nuclear muon capture\, since it operates in the same momentum-exch
 ange region as the $0\\nu\\beta\\beta$ decays. Recent results on the muon 
 capture rate on $^{100}$Mo [5] indicate that the muon-capture calculations
  are able to reproduce the measured capture strength function in a quite s
 atisfactory way. \n\nIn my contribution I present an overview of the probl
 em of effective weak couplings and discuss the relation of the nuclear muo
 n capture to $0\\nu\\beta\\beta$ processes.\n\n*** REFERENCES ***         
                                      \n\n[1] H. Ejiri\, J. Suhonen and K. 
 Zuber\, Neutrino-nuclear responses for astro-neutrinos\,\nsingle beta deca
 ys and double beta decays\, Phys. Rep. 797 (2019) 1-102. \n[2] J. Suhonen\
 , Value of the axial-vector coupling strength in $\\beta$ and $\\beta\\bet
 a$ decays: A review\, Front. Phys. 5 (2017) 55. \n[3] J. Suhonen and J. Ko
 stensalo\, Double $\\beta$ decay and the axial strength\, Front. Phys. 7 (
 2019) 29. \n[4] J. Suhonen\, Impact of the quenching of $g_{\\rm A}$ on th
 e sensitivity of \n$0\\nu\\beta\\beta$ experiments\, Phys. Rev. C 96 (2017
 ) 055501. \n[5] L. Jokiniemi\, J. Suhonen\, H. Ejiri and I. H. Hashim\, Pi
 nning down the strength\nfunction for ordinary muon capture on $^{100}$Mo\
 , Phys. Lett. B 794 (2019) 143-147.\n\nhttps://indico.tlabs.ac.za/event/85
 /contributions/1499/
LOCATION:Main Venue
URL:https://indico.tlabs.ac.za/event/85/contributions/1499/
END:VEVENT
END:VCALENDAR