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	Author	Ge, Z. et al; Ayet, S.
	Title	High-precision measurements of the atomic mass and electron-capture decay Q value of 95 Tc			Type	Journal Article
	Year	2024	Publication	Physics Letters B	Abbreviated Journal	Phys. Lett. B
	Volume	859	Issue		Pages	139094 - 9pp
	Keywords	Penning trap; Mass measurements; Ultra-low Q value; Electron capture
	Abstract	A direct measurement of the ground-state-to-ground-state electron-capture decay Q value of 95 Tc has been performed utilizing the double Penning trap mass spectrometer JYFLTRAP. The Q value was determined to be 1695.92(13) keV by taking advantage of the high resolving power of the phase-imaging ion-cyclotron-resonance technique to resolve the low-lying isomeric state of 95 Tc (excitation energy of 38.910(40) keV) from the ground state. The mass excess of 95 Tc was measured to be -86015.95(18) keV/c2, exhibiting a precision of about 28 times higher and in agreement with the value from the newest Atomic Mass Evaluation (AME2020). Combined with the nuclear energy-level data for the decay-daughter 95 Mo, two potential ultra-low Q-value transitions are identified for future long-term neutrino-mass determination experiments. The atomic self-consistent many-electron Dirac- Hartree-Fock-Slater method and the nuclear shell model have been used to predict the partial half-lives and energy-release distributions for the two transitions. The dominant correction terms related to those processes are considered, including the exchange and overlap corrections, and the shake-up and shake-off effects. The normalized distribution of the released energy in the electron-capture decay of 95 Tc to excited states of 95 Mo is compared to that of 163 Ho currently being used for electron-neutrino-mass determination.
	Address	[Ge, Zhuang; Eronen, Tommi; Ramalho, Marlom; Suhonen, Jouni; Nesterenko, Dmitrii; Kankainen, Anu; Beliuskina, Olga; Hukkanen, Marjut; Jaries, Arthur; Jokinen, Ari; Moore, Iain; Nikas, Stylianos; Stryjczyk, Marek; Virtanen, Ville] Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland, Email: zhuang.z.ge@jyu.fi;
	Corporate Author				Thesis
	Publisher	Elsevier	Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0370-2693	ISBN		Medium
	Area		Expedition		Conference
	Notes	WOS:001348712200001			Approved	no
	Is ISI	yes	International Collaboration	yes
	Call Number	IFIC @ pastor @			Serial	6330
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