Nuclear Data Sheets for A=193

Basunia, M. S.

doi:10.1016/j.nds.2017.08.001

Cited by 20 publications

(3 citation statements)

References 292 publications

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“…This implies that isotopes with the lowest Q value are desirable [12]. 187 Re has been considered for its low Q value of 2.492 (30) stat (15) syst keV [13,14] and because it can be used as a bolometric detector [12,15]. MARE (Microcalorimeter Arrays for a Rhenium Experiment) is the corresponding long-term project carrying the expectations for the future direct neutrino mass measurements [12,15].…”

Section: Introductionmentioning

confidence: 99%

Direct measurement of the mass difference of As72−Ge72 rules out As
Zhuang
¹
,
Eronen
²
,
Roubin
³

et al. 2021
Phys. Rev. C
16
0
6
0
1
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Section: Introductionmentioning

confidence: 99%

Direct measurement of the mass difference of As72−Ge72 rules out As
Zhuang
¹
,
Eronen
²
,
Roubin
³

et al. 2021
Phys. Rev. C
16
0
6
0
1
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“…Comparison of half-lives measured in the current work to those reported previously inRefs. [26,42]. The solid line indicates exact agreement between the two.…”

mentioning

confidence: 77%

Measurement of fusion-evaporation cross sections for reactions of Ca44 with Gd154,156,
Werke
¹
,
Salas
²
,
Glennon
³

et al. 2022
Phys. Rev. C
2
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Background: Previously reported fusion-evaporation cross sections of residues in 45 Sc-induced reactions with lanthanide targets are much smaller than 48 Ca-induced reactions on the same targets. 44 Ca is one proton removed from 45 Sc and could be used to produce nuclei with a relative neutron content between those produced in the 45 Sc-and 48 Ca-induced reactions. Purpose:Several experiments worldwide have attempted to discover elements beyond the currently heaviest known element, oganesson (Z = 118). Due to a lack of appropriate targets, these efforts focused on projectiles other than 48 Ca, which has been widely used for a number of successful element discovery experiments. The present study continues our previous work to understand the influence of various projectiles on the compound nucleus in fusion-evaporation reactions, and addresses the influence of target neutron number on fusion-evaporation cross sections. Methods:In experiments performed at the Cyclotron Institute at Texas A&M University, a beam of 44 Ca 6+ with an energy of ≈5 MeV/u was delivered by the K500 superconducting cyclotron to the Momentum Achromat Recoil Spectrometer (MARS). The 44 Ca projectiles bombarded various isotopically-enriched Gd targets in the MARS target chamber to create evaporation residues, which were spatially separated from unreacted projectiles by MARS and identified via their characteristic -decay energies. Excitation functions for the reactions of 44 Ca with 154,156,157,160 Gd were measured at several projectile energies each. Results:The maximum 4n cross sections in the 44 Ca + 154,156,157,160 Gd reactions were 0.038 ± 0.008, 0.83 ± 0.08, 3.8 ± 0.2, and 3.0 ± 0.5 mb, respectively. Production cross sections for the more neutron-rich targets were surprisingly constant even given the substantial changes in the difference in neutron binding energy and fission barrier of the compound nuclei. Conclusions:Collective enhancements to level density caused a reduction in compound nucleus survivability for all targets. While this effect was required to obtain good agreement between theoretical calculations and experimental data, it was not sufficient to explain the cross sections for the reaction with the most neutron-deficient target studied ( 154 Gd). Instead, it appears that the difference in the fission barrier and neutron binding energy is the dominant factor affecting the survival of the compound nucleus in this case.

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“…The tritium experiment is based on the transition 3 H(1/2 + ) → 3 He(1/2 + ) which is of the allowed type (a Fermi and/or Gamow-Teller transition) with a value of 18.59201 (7) keV [15]. The rhenium experiment relies on the transition 187 Re(5/2 + ) → 187 Os(1/2 − ) which is of the first-forbidden unique type with the lowest known ground-state-to-ground-state (gs-to-gs) -decay value of 2.492 (30) stat (15) sys keV [16,17] (with statistical and systematic uncertainties indicated). Owing to the smaller decay value and the forbidden nature of the − transition, the half-life of the rhenium transition is some 9 orders of magnitude longer than that of tritium.…”

Section: Introductionmentioning

confidence: 99%

High-precision electron-capture $Q$ value measurement of $^{111}$In for electron-neutrino mass determination

Ge,

Eronen,

deRoubin

et al. 2022

Preprint

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A precise determination of the ground state 111 In (9∕2 + ) electron capture to ground state of 111 Cd (1∕2 + ) value has been performed utilizing the double Penning trap mass spectrometer, JYFLTRAP. A value of 857.63(17) keV was obtained, which is nearly a factor of 20 more precise than the value extracted from the Atomic Mass Evaluation 2020 (AME2020). The high-precision electron-capture value measurement along with the nuclear energy level data of 866.60(6) keV, 864.8(3) keV, 855.6(10) keV, and 853.94(7) keV for 111 Cd was used to determine whether the four states are energetically allowed for a potential ultra-low -value decay or electron-capture decay. Our results confirm that the excited states of 866.60(6) keV with spin-parity ( ) of 3/2 + and 864.8(3) keV with = 3/2 + are ruled out due to their deduced electron-capture value being smaller than 0 keV at the level of around 20 and 50 , respectively. Electron-capture decays to the excited states at 853.94( 7) keV ( = 7/2 + ) and 855.6( 10) keV ( = 3/2 + ), are energetically allowed with values of 3.69(19) keV and 2.0(10) keV, respectively. The allowed decay transition 111 In (9/2 + ) → 111 Cd (7/2 + ), with a value of 3.69( 19) keV, is a potential a new candidate for neutrino-mass measurements by future EC experiments featuring new powerful detection technologies. The results show that the indium level 2 1∕2 for this decay branch leads to a significant increase in the number of EC events in the energy region sensitive to the electron neutrino mass.

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Nuclear Data Sheets for A=193

Cited by 20 publications

References 292 publications

Direct measurement of the mass difference of As72−Ge72 rules out As
Zhuang
¹
,
Eronen
²
,
Roubin
³

et al. 2021
Phys. Rev. C
16
0
6
0
1
View full text Add to dashboard Cite

Direct measurement of the mass difference of As72−Ge72 rules out As
Zhuang
¹
,
Eronen
²
,
Roubin
³

et al. 2021
Phys. Rev. C
16
0
6
0
1
View full text Add to dashboard Cite

Measurement of fusion-evaporation cross sections for reactions of Ca44 with Gd154,156,
Werke
¹
,
Salas
²
,
Glennon
³

et al. 2022
Phys. Rev. C
2
0
0
0
View full text Add to dashboard Cite

High-precision electron-capture $Q$ value measurement of $^{111}$In for electron-neutrino mass determination

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Nuclear Data Sheets for A=193

Cited by 20 publications

References 292 publications

Direct measurement of the mass difference of As72−Ge72 rules out AsZhuang1, Eronen2, Roubin3 et al. 2021Phys. Rev. C160601View full textAdd to dashboardCite

Direct measurement of the mass difference of As72−Ge72 rules out AsZhuang1, Eronen2, Roubin3 et al. 2021Phys. Rev. C160601View full textAdd to dashboardCite

Measurement of fusion-evaporation cross sections for reactions of Ca44 with Gd154,156,Werke1, Salas2, Glennon3 et al. 2022Phys. Rev. C2000View full textAdd to dashboardCite

High-precision electron-capture $Q$ value measurement of $^{111}$In for electron-neutrino mass determination

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About

Direct measurement of the mass difference of As72−Ge72 rules out As
Zhuang
¹
,
Eronen
²
,
Roubin
³

et al. 2021
Phys. Rev. C
16
0
6
0
1
View full text Add to dashboard Cite

Direct measurement of the mass difference of As72−Ge72 rules out As
Zhuang
¹
,
Eronen
²
,
Roubin
³

et al. 2021
Phys. Rev. C
16
0
6
0
1
View full text Add to dashboard Cite

Measurement of fusion-evaporation cross sections for reactions of Ca44 with Gd154,156,
Werke
¹
,
Salas
²
,
Glennon
³

et al. 2022
Phys. Rev. C
2
0
0
0
View full text Add to dashboard Cite