Atlas of Nuclear Isomers

Jain, Ashok; Maheshwari, Bhoomika; Garg, Swati; Patial, Monika; Singh, Balraj

doi:10.1016/j.nds.2015.08.001

Cited by 83 publications

(61 citation statements)

References 1,185 publications

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“…We thus conclude that our result confirms the 119m2 Sb isomeric state designation of Refs. [13,14], in contradiction to the adapted assignment [29,30].…”

Section: Insights From 119m2 Sb Mass Measurementmentioning

confidence: 98%

“…This was because of clear methodical problems due to correlations and/or multiple γ rays present in the spectra at almost the same energy, as well as the existence of another isomeric state at 2553.6±0.3 keV. The adopted values for 119m2 Sb in the Atlas of Nuclear Isomers [29] and ENSDF [30] are an excitation energy of 2841.7±0.4 + x keV, where x is to be determined, and spin and parity of 27/2 + . The adopted assignment for the 2841.7 keV level is I π = 21/2 + [30].…”

Section: Insights From 119m2 Sb Mass Measurementmentioning

confidence: 99%

“…According to the Atlas of Nuclear Isomers [29], there are at least 20 more isomeric states that could be investigated with our method at the FRS-IC at GSI (ranging from Co to Ra isotopes, with half-lives in the abovementioned region and resolvable excitation energies), whose excitation energy and quantum numbers are still ambiguous. Specific examples include 178 Ta with two such isomeric levels at 1467.82+x keV (15 − , 58 ms) and 2902.2+x keV (21 − , 290 ms), and 188 Bi and 199 Rn for whom also the branching ratio between α and β + decays is yet unmeasured.…”

Section: Half-lives and Decay Branching Ratio Measurementsmentioning

confidence: 99%

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A novel method for the measurement of half-lives and decay branching ratios of exotic nuclei

et al. 2019

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A novel method for simultaneous measurement of masses, Q-values, isomer excitation energies, half-lives and decay branching ratios of exotic nuclei has been demonstrated. The method includes first use of a stopping cell as an ion trap, combining containment of precursors and decay-recoils for variable durations in a cryogenic stopping cell (CSC), and afterwards the identification and counting of them by a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). Feasibility has been established by recording the decay and growth of 216 Po and 212 Pb (alpha decay) and of 119m2 Sb (t 1/2 = 850 ± 90 ms) and 119g Sb (isomer transition), obtaining half-lives and branching ratios consistent with literature values. Hardly any non-nuclear-decay losses have been observed in the CSC for up to ∼10 seconds, which exhibits its extraordinary cleanliness. For 119 Sb, this is the first direct measurement of the ground and second isomeric state masses, resolving the discrepancies in previous excitation energy data. These results pave the way for the measurement of branching ratios of exotic nuclei with multiple decay channels.

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“…We thus conclude that our result confirms the 119m2 Sb isomeric state designation of Refs. [13,14], in contradiction to the adapted assignment [29,30].…”

Section: Insights From 119m2 Sb Mass Measurementmentioning

confidence: 98%

Section: Insights From 119m2 Sb Mass Measurementmentioning

confidence: 99%

Section: Half-lives and Decay Branching Ratio Measurementsmentioning

confidence: 99%

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A novel method for the measurement of half-lives and decay branching ratios of exotic nuclei

et al. 2019

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“…The long lifetimes result from a combination of nuclear structure effects, such as spin and shape, inhibiting their decay. The main point is not whether the lifetimes are arbitrarily long or short, but rather that these unusually long lifetimes imply state of a different structure and an intrinsic state [17][18][19][20][21]. The obtained knowledge can be used for nuclear structure and astrophysics studies, especially since the r-process is believed to be terminated by the fission of very neutron-rich heavy nuclei [22].…”

Section: Introductionmentioning

confidence: 99%

First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments

et al. 2018

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Publisher's PDF Rakopoulos, V.; Lantz, M.; Solders, A.; Al-Adili, A.; Mattera, A.; Canete, Laetitia; Eronen, Tommi; Gorelov, Dmitry; Jokinen, Ari; Kankainen, Anu; Kolhinen, Veli; Moore, Iain; Nesterenko, Dmitrii; Penttilä, Heikki; Pohjalainen, Ilkka; Rinta-Antila, Sami; Simutkin, V.; Vilén, Markus; Voss, Annika; Pomp, S.Rakopoulos, V., Lantz, M., Solders, A., Al-Adili, A., Mattera, A., Canete, L., . . . Pomp, S. (2018). First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments. Physical Review C, 98 (2) We report the first experimental determination of independent isomeric yield ratios using direct ion counting with a Penning trap, which offered such a high resolution in mass that isomeric states could be separated. The measurements were performed at the Ion Guide Isotope Separator On-Line (IGISOL) facility at the University of Jyväskylä. The isomer production ratios of 81 Moreover, based on the isomeric yield ratios, the root-mean-square angular momenta (J rms ) of the fission fragments after scission were estimated using the TALYS code. The experimentally determined isomeric yield ratios, and consequently the deduced J rms , for 130 Sn are significantly lower compared to 128 Sn for both fissioning systems. This can be attributed to the more spherical shape of the fragments that contribute to the formation of 130 Sn, due to their proximity to the N = 82 shell closure. The values of J rms for 129 Sb are higher than 128 Sn for both reactions, despite the same neutron number of both nuclides (N = 78), indicating the odd-Z effect where fission fragments with odd-Z number tend to bear larger angular momentum than even-Z fragments. The isomer production ratio for the isotopes of Sn is more enhanced in the nat U(p, f ) reaction than in 232 Th(p, f ). The opposite is observed for 96 Y and 97 Y. These discrepancies might be associated to different scission shapes of the fragments for the two fission reactions, indicating the impact that the different fission modes can have on the isomeric yield ratios.

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“…The resonance production as well as the quantum state of the resulting nucleon after pion emission is expected to depend on the projectile as well as its energy. The existence of a large number of metastable states [38,39] allows the extension of the present work to other regions of the nuclidic chart. Experiments focusing on nuclei with the same atomic mass as the projectile are the most promising as these allow the direct investigation of the process, without the interference caused by additional neutron or proton emission.…”

mentioning

confidence: 97%

Role of the Δ Resonance in the Population of a Four-Nucleon State in the Fe56→
Podolyák¹,
Shand²,
Lalović³
et al. 2016
Phys. Rev. Lett.
6
0
4
0
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The 54 Fe nucleus was populated from a 56 Fe beam impinging on a Be target with an energy of E/A=500 M eV. The internal decay via γ-ray emission of the 10 + metastable state was observed. As the structure of this isomeric state has to involve at least four unpaired nucleons, it cannot be populated in a simple two-neutron removal reaction from the 56 Fe ground state. The isomeric state was produced in the low-momentum/energy tail of the parallel momentum/energy distribution of 54 Fe, suggesting that it was populated via the decay of the ∆ 0 resonance into a proton. This process allows the population of four-nucleon states, such as the observed isomer. Therefore, it is concluded that the observation of this 10 + metastable state in 54 Fe is a consequence of the quark structure of the nucleons.

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Atlas of Nuclear Isomers

Cited by 83 publications

References 1,185 publications

A novel method for the measurement of half-lives and decay branching ratios of exotic nuclei

A novel method for the measurement of half-lives and decay branching ratios of exotic nuclei

First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments

Role of the Δ Resonance in the Population of a Four-Nucleon State in the Fe56→
Podolyák¹,
Shand²,
Lalović³
et al. 2016
Phys. Rev. Lett.
6
0
4
0
View full text Add to dashboard Cite

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Atlas of Nuclear Isomers

Cited by 83 publications

References 1,185 publications

A novel method for the measurement of half-lives and decay branching ratios of exotic nuclei

A novel method for the measurement of half-lives and decay branching ratios of exotic nuclei

First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments

Role of the Δ Resonance in the Population of a Four-Nucleon State in the Fe56→Podolyák1, Shand2, Lalović3 et al. 2016Phys. Rev. Lett.6040View full textAdd to dashboardCite

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Role of the Δ Resonance in the Population of a Four-Nucleon State in the Fe56→
Podolyák¹,
Shand²,
Lalović³
et al. 2016
Phys. Rev. Lett.
6
0
4
0
View full text Add to dashboard Cite