Final results of the measurement to search for rare decays of naturally occurring osmium isotopes with ultra-low background gamma-ray spectrometry
P. Belli, R. Bernabei, F. Cappella, V. Caracciolo, R. Cerulli, F. A. Danevich, V. Yu. Denisov, A. Incicchitti, D. V. Kasperovych, V. V. Kobychev, G. P. Kovtun, … 展开作者
P. Belli, R. Bernabei, F. Cappella, V. Caracciolo, R. Cerulli, F. A. Danevich, V. Yu. Denisov, A. Incicchitti, D. V. Kasperovych, V. V. Kobychev, G. P. Kovtun, M. Laubenstein, D. V. Poda, O. G. Polischuk, A. P. Shcherban, D. A. Solopikhin, S. Tessalina, V. I. Tretyak
A long-term measurement was conducted to search for $α$, double-$α$ and double-$β$ decays with $γ$ quanta emission in naturally occurring osmium isotopes. This study took advantage of two ultra-low background HPGe detectors and one ultra-low background BEGe detector at the Gran Sasso National Laboratory (LNGS) of the INFN. Over almost 5 years of data were taken using high-purity osmium samples of approximately 173 g. The half-life limits set for a decays of $^{184}$Os to the first $2^+$ 103.6 keV excited level of $^{180}$W ($T_{1/2} > 9.3 \times 10^{15}$ yr) and of $^{186}$Os to the first $2^+$ 100.1 keV of $^{182}$W ($T_{1/2} > 4.8 \times 10^{17}$ yr) exceed substantially the present theoretical predictions that are at level of $T_{1/2} \sim (0.6 - 3) \times 10^{15}$ yr for $^{184}$Os and $T_{1/2} \sim (0.3 - 2) \times 10^{17}$ yr for $^{186}$Os. New half-life limits on the 2EC and EC$β^+$ decay of $^{184}$Os to the ground and excited levels of $^{184}$W were set at level of $T_{1/2} > 10^{16} - 10^{17}$ yr; a lower limit on the $2β^-$ decay of $^{192}$Os to the $2^+$ 316.5 keV excited level of $^{192}$Pt was estimated as $T_{1/2} > 6.1 \times 10^{20}$ yr. The half-life limits for $2α$ decay of $^{189}$Os and $^{192}$Os were set for the first time at level of $T_{1/2} > 10^{20}$ yr.
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Pacific Northwest National Laboratory（太平洋西北国家实验室）；University of Alabama（阿拉巴马大学）；SUBATECH, Nantes Universite, IMT Atlantique, CNRS-IN2P3（苏巴特克，南特大学，IMT大西洋学院，法国国家科学研究中心-法国国家粒子物理研究所）；University of Massachusetts（马萨诸塞大学）；Stanford University（斯坦福大学）；SLAC National Accelerator Laboratory（斯坦福直线加速器中心）；Drexel University（德雷塞尔大学）；National Research Center ``Kurchatov Institute''（库尔恰托夫国家研究中心）；Lawrence Livermore National Laboratory（劳伦斯利弗莫尔国家实验室）；University of Kentucky（肯塔基大学）；Brookhaven National Laboratory（布鲁克海文国家实验室）；Rensselaer Polytechnic Institute（伦斯勒理工学院）；McGill University（麦吉尔大学）；SNOLAB（斯诺实验室）；Laurentian University（劳伦森大学）；Institute of Microelectronics, Chinese Academy of Sciences（中国科学院微电子研究所）；University of North Carolina Wilmington（北卡罗来纳大学威尔明顿分校）；Yale University（耶鲁大学）；Carleton University（卡尔顿大学）；University of Windsor（温莎大学）；Colorado State University（科罗拉多州立大学）；Skyline College（天际学院）；University of South Dakota（南达科他大学）；Colorado School of Mines（科罗拉多矿业学院）；IBS Center for Underground Physics（韩国基础科学研究院地下物理中心）；Montclair State University（蒙克莱尔州立大学）；University of Hawaii at Manoa（夏威夷大学马诺阿分校）
