Two-neutrino double-beta decay in coupled QRPA with neutron-proton pairing

Cheoun, Myung-Ki; Bobyk, A.; Faessler, Amand; Šimkovic, F.; Teneva, G.

doi:10.1016/0375-9474(93)90508-u

Cited by 61 publications

(31 citation statements)

References 16 publications

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“…Both reactions are increased by about 15% maximally by the Coulomb distortion. For pairing interactions, g nn = 1.105, g pp = 1.057, and g np = 1.5368 are used to reproduce the empirical pairing gaps nn = 1.768, pp = 1.776, and δ np = 0.684 MeV for 40 Ar, respectively [15]. Figure 4 shows the results for the NC reaction 40 Ar(ν e ,ν e ) 40 Ar * for SN neutrinos.…”

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confidence: 99%

Reactions onAr40involving solar neutrinos and neutrinos from core-collapsing supernovae

Cheoun

Kajino

2011

Phys. Rev. C

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We calculated neutrino reactions on 40 Ar for detecting core-collapsing supernovae (SNe) neutrinos. The nucleus was originally exploited to identify the solar neutrino emitted from 8 B produced in pp chains on the Sun. With the higher energy neutrinos emitted from the core-collapsing SNe, contributions from higher multipole transitions, as well as from the Gamow-Teller and Fermi transitions, are shown to be important ingredients for understanding reactions induced by the SN neutrino. Moreover, higher excited states beyond a few states known in experiment diminish significantly the expected large difference between the cross sections of ν e andν e reactions on 40 Ar, which difference is anticipated because of the large Q value in theν e reaction. The reduction is shown to lead to a difference between them of only a factor of 2.Neutrino reactions on 40 Ar are of astrophysical importance because the reactions are used to detect the solar neutrino emitted from 8 B in the Sun through the liquid argon time projection chamber (LArTPC) in ICARUS (Imaging of Cosmic and Rare Underground Signals) [1]. Since the maximum energy of the solar neutrino is thought to be about 17 MeV in the standard solar model, the neutrino reactions are sensitive to discrete energy states of 40 Ar. The Q value for the 40 Ar(ν e ,e − ) 40 K * reaction is 1.50 MeV, while it is 7.48 MeV for the 40 Ar(ν e ,e + ) 40 Cl * reaction. Moreover, in 40 Cl * only two excited states for the Gamow-Teller (GT) transition are known with no excited isobaric analog states. Therefore, the 40 Ar(ν e ,e + ) 40 Cl * reaction might be kinematically disfavored in the solar neutrino. In this respect, 40 Ar was claimed to effectively distinguish the ν e andν e emitted from the Sun.Recently, Ref.[2] revised previous work [3] by focusing on the possible detection of neutrino oscillation of supernova (SN) neutrinos. The SN neutrinos may give valuable information about neutrino properties, such as the ν mixing angle θ 13 and the mass hierarchy, because they traverse regions of dense matter in the exploding star where matter-enhanced oscillations take place.One possible way to extract such information is to investigate the abundances of light nuclei, 7 Li and 11 B, which are abundantly produced through the ν process, that is, ν-induced reactions on related nuclei in core-collapsing SNe [4,5]. Since the ν-induced reaction might be sensitive to the ν properties as well as ν flavors, their abundances could be sensitive to the ν parameters.Another way is to directly detect the ν signals coming from core-collapsing SN explosions on the Earth through the LArTPC detector [6]. This ICARUS-like detector is also planned to detect the neutrino beam at CERN [7].Since neutrino energies from SN explosions are expected to be higher than those stemming from the solar neutrino [4,5], one needs to consider the contributions from higher multipole * Corresponding author: cheoun@ssu.ac.kr transitions. Random phase approximation (RPA) calculations [2,3,8] showed that contributions from higher mult...

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confidence: 99%

Reactions onAr40involving solar neutrinos and neutrinos from core-collapsing supernovae

Cheoun

Kajino

2011

Phys. Rev. C

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“…Recently, the QRPA theory has been extended so as the proton -neutron pairing to be taken into account by using a HFB ground state. Such a QRPA teatment of the nuclear double beta decay process, for example, indicates that the effect of proton -neutron pairing is significant [22,23].…”

Section: B Quasi-particle Rpa Calculationmentioning

confidence: 99%

Nuclear structure dependence of the coherent (μ-,e-) conversion matrix elements

Kosmas¹,

Faessler²,

Šimkovic³

et al. 2020

hnps

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Coherent rates for the neutrinoless muon to electron conversion. (μ-, e-) in the presence of nuclei, are studied throughout the periodic table. The relevant ground state to ground state transition matrix elements are obtained in the context of the quasi-particle RPA. The results are discussed in view of the existing experimental data extracted at TRIUMF and PSI for 48Ti and 208Pb nuclei and compared with: (i) the single particle shell model results calculated with a determinantal ground state wave function and (ii) the results deduced in a local density approximation.

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“…The experimental half-life values of the rsGe and s2Se OvPP decay are separately T~&"2 (exp) 1.93 x 1024 yr [13] for rsGe +rs Se + 2e 1.8 x 10 yr [24] for s2Se ms2 Kr+ 2e (14) The upper limits on the light neutrino mass mg", thẽ izing peremptory g of the right-handed current, and the relation between mg"and g can be obtained by 6tting the above half-lives. For the heavy neutrino, we only consider a single heavy mass eigenstate contribution to the left-handed neutrino Beld.…”

Section: Effects Of Src and Ncpmentioning

confidence: 99%

“…Theoretically, much efFort has been made by many physicists to calculate the nuclear matrix elements for the double-beta decay, which are based on the quasiparticle random-phase approximation (QRPA) [14,15] and shell model [2,3, 16 -18] approaches. We have calculated the nuclear matrix elements of the Ovpl3 decay in 4sCa, 7 Ge, and s2Se by using the shell model wave functions in a model space approximation [17,18].…”

Section: Introductionmentioning

confidence: 99%

Effect of nucleon correlation in the 0νββ decay ofGe76andSe
Wu
¹

1994
Phys. Rev. C
2
0
1
0
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Two-neutrino double-beta decay in coupled QRPA with neutron-proton pairing

Cited by 61 publications

References 16 publications

Reactions onAr40involving solar neutrinos and neutrinos from core-collapsing supernovae

Reactions onAr40involving solar neutrinos and neutrinos from core-collapsing supernovae

Nuclear structure dependence of the coherent (μ-,e-) conversion matrix elements

Effect of nucleon correlation in the 0νββ decay ofGe76andSe
Wu
¹

1994
Phys. Rev. C
2
0
1
0
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Two-neutrino double-beta decay in coupled QRPA with neutron-proton pairing

Cited by 61 publications

References 16 publications

Reactions onAr40involving solar neutrinos and neutrinos from core-collapsing supernovae

Reactions onAr40involving solar neutrinos and neutrinos from core-collapsing supernovae

Nuclear structure dependence of the coherent (μ-,e-) conversion matrix elements

Effect of nucleon correlation in the 0νββ decay ofGe76andSeWu1 1994Phys. Rev. C2010View full textAdd to dashboardCite

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Effect of nucleon correlation in the 0νββ decay ofGe76andSe
Wu
¹

1994
Phys. Rev. C
2
0
1
0
View full text Add to dashboard Cite