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Title: α decay of high- K isomers in Ds 270 and Hs 266 in a superfluid tunneling model

Abstract

Here, we use the superfluid tunneling model (STM) to calculate the half-lives of ground-state α decays of even-even superheavy nuclei (SHN) with Z ≥ 100 . The experimental data are reproduced to accuracies comparable to other contemporary models of α decay of SHN. We apply the STM to the case of the α decaying high-K isomers identified in the decay chains of 270Ds . By accounting for the α -decay Q values, Qα, the angular momentum difference between initial and final states, L, and a reduction in the pairing gap, Δ, we are able to reproduce the observed α decay of the isomers, including the unusual competition between L ≈ 10 and L ≈ 0 α branches seen for the K isomer in 270Ds ( Z = 110 ).

Authors:
 [1];  [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
  2. Lund Univ. (Sweden). Dept. of Physics
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); Knut and Alice Wallenberg Foundation (KAW)
OSTI Identifier:
1430686
Alternate Identifier(s):
OSTI ID: 1422641
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Clark, R. M., and Rudolph, D. α decay of high- K isomers in Ds270 and Hs266 in a superfluid tunneling model. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.97.024333.
Clark, R. M., & Rudolph, D. α decay of high- K isomers in Ds270 and Hs266 in a superfluid tunneling model. United States. doi:10.1103/PhysRevC.97.024333.
Clark, R. M., and Rudolph, D. Thu . "α decay of high- K isomers in Ds270 and Hs266 in a superfluid tunneling model". United States. doi:10.1103/PhysRevC.97.024333. https://www.osti.gov/servlets/purl/1430686.
@article{osti_1430686,
title = {α decay of high- K isomers in Ds270 and Hs266 in a superfluid tunneling model},
author = {Clark, R. M. and Rudolph, D.},
abstractNote = {Here, we use the superfluid tunneling model (STM) to calculate the half-lives of ground-state α decays of even-even superheavy nuclei (SHN) with Z ≥ 100 . The experimental data are reproduced to accuracies comparable to other contemporary models of α decay of SHN. We apply the STM to the case of the α decaying high-K isomers identified in the decay chains of 270Ds . By accounting for the α -decay Q values, Qα, the angular momentum difference between initial and final states, L, and a reduction in the pairing gap, Δ, we are able to reproduce the observed α decay of the isomers, including the unusual competition between L ≈ 10 and L ≈ 0 α branches seen for the K isomer in 270Ds ( Z = 110 ).},
doi = {10.1103/PhysRevC.97.024333},
journal = {Physical Review C},
number = 2,
volume = 97,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
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Figures / Tables:

Table 1 Table 1: Comparison between the decimal logarithms of the experimental and calculated ground-state-to-ground-state $α$-decay half-lives (in seconds) for all known even-even cases with $Z$≥100. The first column gives the nucleus of interest. The second column gives the Q value for the $α$ decay, ϱα (in MeV, with uncertainties typically lessmore » than 0.1% of the absolute value), either calculated using the AME2016 atomic mass evaluation tables of [26] or taken from [11]. The third column has the decimal logarithm of the experimental half-life taken from the evaluated nuclear data files [25] or from [11]. Generally, the experimental uncertainties in the half-lives are small enough to be ignored for the purposes of plots in Figures 1 and 2. The fourth, fifth, and sixth columns are the decimal logarithms of the $α$-decay half-lives calculated using the Superfluid Tunneling Model (T1/2,STM), the Viola-Seaborg formula [7] using the parameters in [8] (T1/2,VS), and the Royer formula [9] (T1/2,Royer), respectively.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.