Systematics of Evaluated Half-lives of Double-beta Decay

Pritychenko, B.

doi:10.1016/j.nds.2014.07.018

Cited by 14 publications

(29 citation statements)

References 43 publications

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“…(Lodders et al 2009); alpha, beta and double-beta decay half lives (T 1/2 ) are gathered from the Evaluated Nuclear Structure Data File (ENSDF 2020) and Ref. (Pritychenko 2014), respectively.…”

Section: Neutron Fluence Of S-process Nucleimentioning

confidence: 99%

Determination of Solar System R-Process Abundances using ENDF/B-VIII.0 and TENDL-2015 libraries

Pritychenko¹

2020

Preprint

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Recent multi-messenger detection of the binary neutron star merger (GW170817) energized the astrophysical community and encouraged further research for determination of nuclear physics observables. Comprehensive studies of atomic nuclei in the cosmos provide an opportunity for investigating these astrophysical phenomena and acquiring complementary information on stellar nucleosynthesis processes that can be verified using the latest nuclear data.Evaluated Nuclear Data File (ENDF) libraries contain complete collections of reaction cross sections over the energy range relevant to astrophysics, fission yields and decay data. These data collections have been used worldwide in nuclear science, industry and national security applications. There is great interest in exploring the ENDF/B-VIII.0 and TALYS Evaluated Nuclear Data Library (TENDL-2015) for nuclear astrophysics purposes and comparing findings with the Karlsruhe Astrophysical Database of Nucleosynthesis in Stars (KADoNiS).The Maxwellian-averaged cross sections (MACS) and astrophysical reaction rates have been calculated using the ENDF/B-VIII.0 and TENDL-2015 evaluated data sets. The calculated cross sections were combined with the solar system abundances and fitted using the classical model of stellar nucleosynthesis. Astrophysical rapid-and slow-neutron capture, r-and s-process, respectively, abundances were obtained from present data and compared with available values. Further analysis of MACS reveals potential evaluated libraries data deficiencies and a strong need for new measurements. The current results demonstrate a large nuclear astrophysics potential of evaluated libraries and mutually beneficial relations between nuclear industry and research efforts.

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Section: Neutron Fluence Of S-process Nucleimentioning

confidence: 99%

Determination of Solar System R-Process Abundances using ENDF/B-VIII.0 and TENDL-2015 libraries

Pritychenko¹

2020

Preprint

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“…It is less probable than a double beta decay with the emission of two electrons and two neutrinos (2νββ). The latter process has been detected in direct experiments for 11 different nuclei [1,2], whereas there are only a few indications of the 2νECEC process which have been seen in 78 Kr. They were discussed in our previous works [3,4], and a geochemical measurement for 130 Ba [5,6] with the half-lives of the order of 10 21 years.…”

Section: Introductionmentioning

confidence: 95%

Comparative study of the double- K -shell-vacancy production in single- and double-electron-capture decay

Ratkevich

Gangapshev²,

Gavrilyuk³

et al. 2017

Phys. Rev. C

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Background: A double K-electron capture is a rare nuclear-atomic process in which two K electrons are captured simultaneously from the atomic shell. A "hollow atom" is created as a result of this process. In single K shell electron-capture decays, there is a small probability that the second electron in the K-shell is excited to an unoccupied level or can (mostly) be ejected to the continuum. In either case, a double vacancy is created in the K-shell. The relaxation of the double K-shell vacancy, accompanied by the emission of two K-fluorescence photons, makes it possible to perform experimental studies of such rare processes with the large-volume proportional gas chamber. Purpose: The purpose of the present analysis is to estimate a double-K-shell vacancy creation probability per K-shell electron capture PKK of 81 Kr, as well as to measure the half-life of 78 Kr relative to 2ν2K capture. Method: Time-resolving current pulse from the large low-background proportional counter (LPC), filled with the krypton sample, was applied to detect triple coincidences of "shaked" electrons and two fluorescence photons. Results: The number of K-shell vacancies per the K-electron capture, produced as a result of the shake-off process, has been measured for the decay of 81 Kr. The probability for this decay was found to be PKK = (5.7 ± 0.8) × 10 −5 with a systematic error of (∆PKK )syst = ±0.4 × 10 −5 . For the 78 Kr(2ν2K) decay, the comparative study of single-and double-capture decays allowed us to obtain the signal-to-background ratio up to 15/1. The half-life22 y is determined from the analysis of data that have been accumulated over 782 days of live measurements in the experiment that used samples consisted of 170.6 g of 78 Kr. Conclusions: The data collected during low background measurements using the LPC were analyzed to search the rare atomic and nuclear processes. We have determined P exp KK for the EC decay of 81 Kr, which are in satisfactory agreement with Z −2 dependence of PKK predicted by Primakoff and Porter. This made possible to more accurately determine the background contribution in the energy region of our interest for the search for the 2K-capture in 78 Kr. The general procedure of data analysis allowed us to determine the half-life of 78 Kr relative to 2ν2K-transition with a greater statistical accuracy than in our previous works.

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“…2 shows the Q ββ = B(A, Z + 2) − B(A, Z) + 2∆ npe value of these isotopes. Since the first experiments on 2νββ decay [19,20], a dozen of isotopes have already been measured with half-lives T 2ν 1/2 ranging from 10 18 to 10 21 years [15,21,22,23]. The 0νββ decay mode was first considered by Furry [24] who was motivated by the seminal papers of Majorana [25] and Racah [26] which suggested that the neutrino may coincide with its own anti-particle.…”

Section: Introductionmentioning

confidence: 99%

Beyond-mean-field approaches for nuclear neutrinoless double beta decay in the standard mechanism

Yao,

Meng,

Niu

et al. 2021

Preprint

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Nuclear weak decays provide important probes to fundamental symmetries in nature. A precise description of these processes in atomic nuclei requires comprehensive knowledge on both the strong and weak interactions in the nuclear medium and on the dynamics of quantum many-body systems. In particular, an observation of the hypothetical double beta decay without emission of neutrinos (0νββ) would unambiguously demonstrate the Majorana nature of neutrinos and the existence of the lepton-number-violation process. It would also provide unique information on the ordering and absolute scale of neutrino masses. The next-generation tonne-scale experiments with sensitivity up to 10 28 years after a few years of running will probably provide a definite answer to these fundamental questions based on our current knowledge on the nuclear matrix element (NME), the precise determination of which is a challenge to nuclear theory. Beyond-mean-field approaches have been frequently adapted for the studies of nuclear structure and decay throughout nuclear chart for several decades. In this review, we summarize the status of beyond-mean-field calculations of the NMEs of 0νββ decay assuming the standard mechanism of an exchange of light Majorana neutrinos. The challenges and future prospects in the extension and application of beyond-mean-field approaches for 0νββ decay are discussed. Contents

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Systematics of Evaluated Half-lives of Double-beta Decay

Cited by 14 publications

References 43 publications

Determination of Solar System R-Process Abundances using ENDF/B-VIII.0 and TENDL-2015 libraries

Determination of Solar System R-Process Abundances using ENDF/B-VIII.0 and TENDL-2015 libraries

Comparative study of the double- K -shell-vacancy production in single- and double-electron-capture decay

Beyond-mean-field approaches for nuclear neutrinoless double beta decay in the standard mechanism

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