scholarly journals Magnetic HexadecapoleγTransitions and Neutrino-Nuclear Responses in Medium-Heavy Nuclei

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Lotta Jokiniemi ◽  
Jouni Suhonen ◽  
Hiroyasu Ejiri
Keyword(s):  
Nuclear Matrix ◽  
Wave Functions ◽  
Matrix Elements ◽  
Heavy Nuclei ◽  
Magnetic Quadrupole ◽  
Order Of Magnitude ◽  
Nuclear Responses ◽  
Beta Decays ◽  
Gamow Teller ◽  
Phonon Model

Neutrino-nuclear responses in the form of squares of nuclear matrix elements, NMEs, are crucial for studies of neutrino-induced processes in nuclei. In this work we investigate magnetic hexadecapole (M4) NMEs in medium-heavy nuclei. The experimentally derived NMEs,MEXP(M4), deduced from observed M4γtransition half-lives are compared with the single-quasiparticle (QP) NMEs,MQP(M4), and the microscopic quasiparticle-phonon model (MQPM) NMEsMMQPM(M4). The experimentally derived M4 NMEs are found to be reduced by a coefficientk≈0.29with respect toMQP(M4) and byk≈0.33with respect toMMQPM(M4). The M4 NMEs are reduced a little by the quasiparticle-phonon correlations of the MQPM wave functions but mainly by other nucleonic and nonnucleonic correlations which are not explicitly included in the MQPM. The found reduction rates are of the same order of magnitude as those for magnetic quadrupoleγtransitions and Gamow-Teller (GT) and spin-dipole (SD)βtransitions. The impacts of the found reduction coefficients on the magnitudes of the NMEs involved in astroneutrino interactions and neutrinoless double beta decays are discussed.

GT strengths studied by (3He, t) reactions and nuclear matrix elements for double beta decays

1997 ◽  
Vol 394 (1-2) ◽  
pp. 23-28 ◽  
Author(s):  
Hidetoshi Akimune ◽  
Hiroyasu Ejiri ◽  
Mamoru Fujiwara ◽  
Izuru Daito ◽  
Toru Inomata ◽  
...  
Keyword(s):  
Nuclear Matrix ◽  
Matrix Elements ◽  
Beta Decays

scholarly journals Spin-dipole nuclear matrix elements for double beta decays and astro-neutrinos

2014 ◽  
Vol 729 ◽  
pp. 27-32 ◽  
Author(s):  
H. Ejiri ◽  
N. Soukouti ◽  
J. Suhonen
Keyword(s):  
Nuclear Matrix ◽  
Matrix Elements ◽  
Beta Decays

scholarly journals Experimental Approaches to Neutrino Nuclear Responses for ββ Decays and Astro-Neutrinos

2021 ◽  
Vol 9 ◽  
Author(s):  
Hiroyasu Ejiri
Keyword(s):  
Matrix Element ◽  
Charge Exchange ◽  
Nuclear Matrix ◽  
Experimental Studies ◽  
Nuclear Matrix Element ◽  
Exchange Reactions ◽  
Fundamental Properties ◽  
Experimental Approaches ◽  
Nuclear Responses ◽  
Beta Decays

Fundamental properties of neutrinos are investigated by studying double beta decays (ββ-decays), while atro-neutrino nucleo-syntheses and astro-neutrino productions are investigated by studying inverse beta decays (inverse β-decays) induced by astro-neutrinos. Neutrino nuclear responses for these ββ and β-decays are crucial for these neutrino studies in nuclei. This reports briefly perspectives on experimental studies of neutrino nuclear responses (square of nuclear matrix element) for ββ-decays and astro-neutrinos by using nuclear and leptonic (muon) charge-exchange reactions

Neutrinoless double beta decays and nuclear matrix elements of 76Ge and 82Se

1994 ◽  
Vol 242 (4-6) ◽  
pp. 495-503
Author(s):  
H.F. Wu ◽  
C.L. Song ◽  
H.Q. Song
Keyword(s):  
Nuclear Matrix ◽  
Matrix Elements ◽  
Beta Decays

The β+ Decay of 234Np and Other Isospin-Forbidden 0+→ 0+ Fermi Transitions

1984 ◽  
Vol 39 (12) ◽  
pp. 1168-1171
Author(s):  
C. T. Yap ◽  
E. L. Saw
Keyword(s):  
Nuclear Matrix ◽  
Coulomb Potential ◽  
Deformation Parameter ◽  
Theoretical Calculations ◽  
Wave Functions ◽  
Matrix Elements ◽  
Β Decay ◽  
A Value ◽  
Experimental Values ◽  
Good Agreement

Although experimental values of the Fermi nuclear matrix elements vary widely from about 1 × 10-3 to 40 × 10-3 for isospin-forbidden 0+→0+ β transitions, theoretical calculations using the Coulomb potential and Nilsson wave functions yielded values of MF in reasonably good agreement, except that of 234Np. However, our calculation of MF for this decay as a function of the deformation parameter β yielded a value of MF in good agreement with experiment for values of β between 0.1 and 0.2.

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