AUTHOR=Ejiri Hiroyasu 

TITLE=Experimental Approaches to Neutrino Nuclear Responses for ββ Decays and Astro-Neutrinos

JOURNAL=Frontiers in Physics

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2021.650421

DOI=10.3389/fphy.2021.650421

ISSN=2296-424X

ABSTRACT=<p>Fundamental properties of neutrinos are investigated by studying double beta decays (<inline-formula id="inf1"><mml:math id="minf1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>β</mml:mi><mml:mi>β</mml:mi></mml:mrow></mml:math></inline-formula>-decays), while atro-neutrino nucleo-syntheses and astro-neutrino productions are investigated by studying inverse beta decays (inverse <italic>β</italic>-decays) induced by astro-neutrinos. Neutrino nuclear responses for these <inline-formula id="inf2"><mml:math id="minf2" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>β</mml:mi><mml:mi>β</mml:mi></mml:mrow></mml:math></inline-formula> and <italic>β</italic>-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 <inline-formula id="inf340"><mml:math id="minf340" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>β</mml:mi><mml:mi>β</mml:mi></mml:mrow></mml:math></inline-formula>-decays and astro-neutrinos by using nuclear and leptonic (muon) charge-exchange reactions</p>