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Title: First limit on neutrinoless quadruple β decay of Nd 150 to the 0 1 + state of Gd 150

Abstract

Observation of lepton number violation via detection of neutrinoless double β decay requires that the neutrino be a Majorana particle. If the neutrino is a Dirac particle, a potential lepton-number violating process is neutrinoless quadruple β decay. Only a few nuclei can undergo neutrinoless quadruple β decay; one of these nuclei is 150Nd. This study yields the first half-life limit of the neutrinoless quadruple β decay to the excited $0$ $$^{+}_{1}$$ state of 150Gd. Here, we searched for neutrinoless quadruple β decay events to excited final states of 150Gd by detecting the deexcitation γ rays of the daughter nucleus in coincidence. These γ rays have energies of 569.031 and 638.050 keV, and are emitted in coincidence through a $0$ $$^{+}_{1}$$ → $2$ $$^{+}_{1}$$ → $0$ $$^{+}_{gs}$$ transition. The enriched Nd 2O 3 sample consisted of 40.33 ± 0.02 g 150Nd and was observed for 642.8 days at the Kimballton Underground Research Facility. A half-life limit for the decay to the $0$ $$^{+}_{1}$$ state of 150Gd was found to be T 1/2 > 1.76 × 10 20 years (90% CL). We report the first search for this decay to excited final states. Though the predicted half-life of this decay is many orders of magnitudes larger, constraining this value experimentally is vital to check for potential enhancements to the decay rate.

Authors:
 [1];  [2]
  1. Tennessee Technological Univ., Cookeville, TN (United States)
  2. Duke Univ., Durham, NC (United States); Triangle Univ. Nuclear Lab., Durham, NC (United States)
Publication Date:
Research Org.:
Duke Univ., Durham, NC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1610380
Alternate Identifier(s):
OSTI ID: 1481449
Grant/Contract Number:  
FG02-97ER41033
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 98; Journal Issue: 5; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; physics; double beta decay; neutrinoless double beta decay

Citation Formats

Kidd, M. F., and Tornow, W. First limit on neutrinoless quadruple β decay of Nd150 to the 01+ state of Gd150. United States: N. p., 2018. Web. doi:10.1103/physrevc.98.055501.
Kidd, M. F., & Tornow, W. First limit on neutrinoless quadruple β decay of Nd150 to the 01+ state of Gd150. United States. doi:10.1103/physrevc.98.055501.
Kidd, M. F., and Tornow, W. Fri . "First limit on neutrinoless quadruple β decay of Nd150 to the 01+ state of Gd150". United States. doi:10.1103/physrevc.98.055501. https://www.osti.gov/servlets/purl/1610380.
@article{osti_1610380,
title = {First limit on neutrinoless quadruple β decay of Nd150 to the 01+ state of Gd150},
author = {Kidd, M. F. and Tornow, W.},
abstractNote = {Observation of lepton number violation via detection of neutrinoless double β decay requires that the neutrino be a Majorana particle. If the neutrino is a Dirac particle, a potential lepton-number violating process is neutrinoless quadruple β decay. Only a few nuclei can undergo neutrinoless quadruple β decay; one of these nuclei is 150Nd. This study yields the first half-life limit of the neutrinoless quadruple β decay to the excited $0$ $^{+}_{1}$ state of 150Gd. Here, we searched for neutrinoless quadruple β decay events to excited final states of 150Gd by detecting the deexcitation γ rays of the daughter nucleus in coincidence. These γ rays have energies of 569.031 and 638.050 keV, and are emitted in coincidence through a $0$ $^{+}_{1}$ → $2$ $^{+}_{1}$ → $0$ $^{+}_{gs}$ transition. The enriched Nd2O3 sample consisted of 40.33 ± 0.02 g 150Nd and was observed for 642.8 days at the Kimballton Underground Research Facility. A half-life limit for the decay to the $0$ $^{+}_{1}$ state of 150Gd was found to be T1/2 > 1.76 × 1020 years (90% CL). We report the first search for this decay to excited final states. Though the predicted half-life of this decay is many orders of magnitudes larger, constraining this value experimentally is vital to check for potential enhancements to the decay rate.},
doi = {10.1103/physrevc.98.055501},
journal = {Physical Review C},
issn = {2469-9985},
number = 5,
volume = 98,
place = {United States},
year = {2018},
month = {11}
}

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