Pinning down the strength function for ordinary muon capture on 100Mo

Muon-capture strength functions in intermediate nuclei of 0νββ decays

“…Even though the pnQRPA often fails to predict the properties of individual states accurately, it can reproduce the gross features of a distribution of nuclear states quite reasonably. It has been shown that the pnQRPA reproduces the locations of the isovector spin-dipole giant resonances reliably [31], and in our earlier OMC study it was shown that it also reproduces the location of the newly discovered OMC giant resonance correctly in the case of 100 Mo [29,30].…”

“…Here we study the possible existence and structure of these resonances. In our earlier study [29] we computed the strength function for the OMC on 100 Mo and compared it with the available data [30]. In this study we extend those calculations by computing the strength functions for the OMCs on 76 Se, 82 Kr, 96 Mo, 100 Ru, 116 Sn, 128 Xe, 130 Xe, and 136 Ba, leading to states in 0νββ intermediate nuclei 76 As, 82 Br, 96 Nb, 100 Tc, 116 In, 128 I, 130 I, and 136 Cs.…”

“…However, it was noticed in Ref. [29] that decreasing the value of g A or increasing the value of g P decreases the total capture rate. In terms of multipoles FIG.…”

Neutrino-nuclear responses and the effective value of weak axial coupling

“…The OMC strength function contains giant resonances, quite like the (p,n) type of transitions contain Gamow-Teller giant resonance and isovector spinmultipole resonances [30,31]. The work [29] uses the powerful OMC formalism of [32] and this is the first time such resonances are being studied both theoretically and experimentally, inspired by the first observation of the OMC giant resonance in 100 Nb at around 12 MeV [33]. Comparison of the computed and measured OMC strength functions in 100 Nb is presented in Fig.…”

“…Incentives of the OMC studies are related to the 0νββ decays and the associated in-medium renormalization of the weak axial (g A ) and induced pseudoscalar (g P ) couplings [11,22,23,24,25,26,27,28], and to neutrino-nucleus interactions in general, as discussed in the recent review [3]. Recently, a pioneering theoretical and experimental study of the OMC on 100 Mo, populating states in 100 Nb in a wide excitation region, up to some 50 MeV, was conducted [29]. The rate of OMC to individual final states forms a strength function quite like in the case of (n,p) chargeexchange reactions for 1 + final states (the Gamow-Teller strength function).…”