scholarly journals Nuclear Matrix Element of β-Decay and the Ratio of Coupling Constants

1955 ◽  
Vol 13 (3) ◽  
pp. 260-264 ◽  
Author(s):  
Jun-ichi Fujita
Keyword(s):  
Matrix Element ◽  
Nuclear Matrix ◽  
Nuclear Matrix Element ◽  
Coupling Constants ◽  
Β Decay

GT± STRENGTH DISTRIBUTION IN 48Sc AND 116In MEASURED BY (p, n) AND (n, p) REACTIONS AT 300 MeV AND THEIR IMPLICATIONS FOR 2ν2β DECAY

2009 ◽  
Vol 18 (10) ◽  
pp. 2119-2123
Author(s):  
HIDE SAKAI ◽  
KENTARO YAKO ◽  
ICHOR COLLABORATION
Keyword(s):  
Matrix Element ◽  
Excitation Energy ◽  
Cross Sections ◽  
Nuclear Matrix ◽  
Differential Cross ◽  
Nuclear Matrix Element ◽  
Strength Distribution ◽  
Angular Distributions ◽  
Decomposition Technique ◽  
Gamow Teller

Angular distributions of the double differential cross sections for the 48 Ca , 116 Cd (p, n) and the 48 Ti , 116 Sn (n, p) reactions were measured at 300 MeV. A multipole decomposition technique was applied to the spectra to extract the Gamow-Teller (GT) transition strengths. In both (n, p) spectra beyond 8 MeV excitation energy extra B( GT +) strengths which are not predicted by either shell model or QRPA calculations. This extra B( GT +) strengths certainly contribute to the nuclear matrix element of the 2ν2β-decay.

Investigation of the 0− → 0+ and 0− → 2+ Beta Transitions in the Decay of 144Pr

1973 ◽  
Vol 51 (21) ◽  
pp. 2260-2269 ◽  
Author(s):  
H. E. Bosch ◽  
M. Behar ◽  
M. C. Cambiaggio ◽  
G. Garcia Bermudez ◽  
L. Szybisz
Keyword(s):  
Experimental Data ◽  
Matrix Element ◽  
Angular Correlation ◽  
Nuclear Matrix ◽  
Nuclear Matrix Element ◽  
Shape Factors ◽  
Spectrum Shape ◽  
Theoretical Function ◽  
Beta Spectra ◽  
Available Information

The first-forbidden beta transitions 0− → 0+ and 0− → 2+ from the decay of 144Pr were studied. The corresponding spectrum shape factors and end-point energies were determined by means of a simultaneous fit of the data on both beta spectra with a theoretical function. The contribution of the induced pseudotensor term has been investigated analyzing the available information on spectrum shape factors, angular correlation, and longitudinal polarization.The data corresponding to both transitions were handled simultaneously. The introduction of the induced pseudotensor term is not indispensable for the interpretation of the experimental data. Besides, the nuclear matrix element [Formula: see text] for the 0− → 0+ transition was determined.

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

Double beta decay nuclear matrix element of 48Ca

1984 ◽  
Vol 143 (4-6) ◽  
pp. 293-296 ◽  
Author(s):  
T. Tsuboi ◽  
K. Muto ◽  
H. Horie
Keyword(s):  
Matrix Element ◽  
Beta Decay ◽  
Nuclear Matrix ◽  
Nuclear Matrix Element ◽  
Double Beta Decay
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