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 decays of the heaviest 
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 nuclei and proton instability of 
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Park, J.; Krücken, R.; Lubos, D.; Gernhäuser, R.; Lewitowicz, M.; Nishimura, S.; Ahn, D. S.; Baba, H.; Blank, Β.; Blazhev, A.; Boutachkov, P.; Browne, F.; Čeliković, I.; Doornenbal, P.; Fang, Y.; Fukuda, N.; Giovinazzo, J.; Goel, N.; Górska, M.; Grawe, H.; Ilieva, S.; Inabe, N.; Isobe, T.; Jungclaus, A.; Kameda, D.; Kim, G. D.; Kim, Y.-K.; Kojouharov, I.; Kubo, T.; Kurz, N.; Lorusso, G.; Moschner, K.; Murai, D.; Nishizuka, I.; Patel, Z.; Rajabali, Mustafa; Rice, S.; Sakuraï, H.; Schaffner, H.; Shimizu, Y.; Sinclair, L.; Söderström, P.-A.; Steiger, Katja; Sumikama, T.; Suzuki, Hiroshi; Takeda, Hiroyuki; Wang, Z.; Watanabe, H.; Wu, J.; Xu, Z. Y.

doi:10.1103/physrevc.97.051301

Cited by 14 publications

(5 citation statements)

References 56 publications

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“…Approximately 2500 100 Sn nuclei were produced, increasing the available world data by a factor of ∼10. The same holds for the even more exotic nuclei along the N ¼ Z − 1 line as well as the newly identified N ¼ Z − 2 nuclei 96 In, 94 Cd, 92 Ag, and 90 Pd [13,14].…”

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confidence: 63%

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Improved Value for the Gamow-Teller Strength of the Sn100 Beta Decay

Lubos¹,

Park²,

Faestermann³

et al. 2019

Phys. Rev. Lett.

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A record number of 100 Sn nuclei was detected and new isotopic species toward the proton dripline were discovered at the RIKEN Nishina Center. Decay spectroscopy was performed with the high-efficiency detector arrays WAS3ABi and EURICA. Both the half-life and the β-decay end point energy of 100 Sn were measured more precisely than the literature values. The value and the uncertainty of the resulting strength for the pure 0 þ → 1 þ Gamow-Teller decay was improved to B GT ¼ 4.4 þ0.9 −0.7 . A discrimination between different model calculations was possible for the first time, and the level scheme of 100 In is investigated further.Sn and its neighboring nuclei comprise a unique testing ground for modern large scale shell model (LSSM) calculations with realistic nuclear interactions. 100 Sn is the heaviest doubly magic N ¼ Z nucleus that is particle stable and decays via a pure and very fast Gamow-Teller (GT) β decay. The 100 Sn region is located in the nuclear chart close to the end of the astrophysical rapid proton capture process path. Thus, it is of particular interest concerning fundamental challenges in both nuclear physics and astrophysics [1].According to the extreme single particle model (ESPM) [2], 100 Sn decays via a pure GT transition of a proton (π) from the completely filled π0g 9=2 orbital into a neutron (ν) in the empty spin-orbit partner, the ν0g 7=2 orbital of 100 In. The ESPM GT strength is predicted to be B GT ¼ 17.78 [1]. However, the experimental values obtained up to now are smaller: 9.1 þ3.0 −2.6 [3] and 5.8 þ5.5 −3.2 [4,5]. These experiments [3,5,6] revealed the smallest log(ft) value-even smaller than the values of nuclei which decay by a Superallowed Fermi decay-throughout the nuclear chart. However, the PHYSICAL REVIEW LETTERS 122, 222502 (2019) 0031-9007=19=122 (22)=222502(6) 222502-1

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supporting

confidence: 63%

“…Because of the missing detectors the efficiency was, with 4.6% at 1 MeV, about half of the optimum value. Nevertheless, isomeric spectroscopy, β-delayed γ spectroscopy, and also γ-γ coincidence measurements were possible [14].…”

mentioning

confidence: 99%

Improved Value for the Gamow-Teller Strength of the Sn100 Beta Decay

Lubos¹,

Park²,

Faestermann³

et al. 2019

Phys. Rev. Lett.

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“…The most significant discrepancy in Q EC was found in 98 In, but it is still within 2σ of several models. Concerning the masses of the lightest Z = 49 isotopes, 97 In has already been suggested to be more bound compared to the lighter odd-Z, N = Z − 1 nuclei 89 Rh and 93 Ag [65]. More precise mass measurements of indium isotopes within the 100 Sn core (N 50) will answer whether they are more bound than predicted.…”

Section: Q β Results For Q Ec and E Xmentioning

confidence: 92%

New and comprehensive β - and βp -decay spectroscopy results in the vicinity of Sn100

Park¹,

Krücken²,

Lubos³

et al. 2019

Phys. Rev. C

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A decay spectroscopy experiment on proton-rich nuclei in the vicinity of the doubly magic 100 Sn was carried out at RIKEN Nishina Center. More than 20 nuclei with 43 Z 50 and N 51, produced by fragmentation reactions were investigated via analyses of β-decay, β p-decay, and subsequent γ-ray data. Owing to higher statistics, the precision on the half-lives of many of the ground states and isomers was improved. β-decay endpoint energies of 11 states in 8 nuclei were measured for the first time, and the corresponding Q EC and excitation energies were generally consistent with various mass models. Many β-delayed proton emission branching ratios were measured either for the first time or with higher precision compared to literature values, and some of them differed by more than 2σ. Many of the large discrepancies were associated with nuclei with long-lived isomeric states, highlighting large systematic uncertainties involved in these measurements. Twenty-five new γ rays were observed, and ten new states are proposed with unambiguous excitation energies, spins, and parities. Most of the energies of the excited states were consistent within 300 keV or 20%, whichever was greater, compared to shell model predictions in the proton/neutron (p 1/2 , g 9/2) model space assuming a 76 Sr core. A signature of a new (1/2 −) isomer in 97 Cd with T 1/2 = 0.73(7) s was found, in good agreement with shell model predictions.

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“…Nuclei in the immediate vicinity of 100 Sn offer important insight for understanding the single-neutron and proton states in this region and constitute an excellent proxy for the study of 100 Sn itself. However, experiments have so far only been feasible with in-beam gamma-ray spectroscopy at fragmentation facilities 4,5,[7][8][9][10] . By direct determination of the nuclear binding energy, high-precision atomic-mass measurements provide a crucial model-independent probe of the structural evolution of exotic nuclei.…”

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confidence: 99%

Mass measurements of 99–101In challenge ab initio nuclear theory of the nuclide 100Sn

et al. 2021

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The tin isotope 100Sn is of singular interest for nuclear structure due to its closed-shell proton and neutron configurations. It is also the heaviest nucleus comprising protons and neutrons in equal numbers—a feature that enhances the contribution of the short-range proton–neutron pairing interaction and strongly influences its decay via the weak interaction. Decay studies in the region of 100Sn have attempted to prove its doubly magic character1 but few have studied it from an ab initio theoretical perspective2,3, and none of these has addressed the odd-proton neighbours, which are inherently more difficult to describe but crucial for a complete test of nuclear forces. Here we present direct mass measurements of the exotic odd-proton nuclide 100In, the beta-decay daughter of 100Sn, and of 99In, with one proton less than 100Sn. We use advanced mass spectrometry techniques to measure 99In, which is produced at a rate of only a few ions per second, and to resolve the ground and isomeric states in 101In. The experimental results are compared with ab initio many-body calculations. The 100-fold improvement in precision of the 100In mass value highlights a discrepancy in the atomic-mass values of 100Sn deduced from recent beta-decay results4,5.

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β decays of the heaviest N=Z−1 nuclei and proton instability of In97

Cited by 14 publications

References 56 publications

Improved Value for the Gamow-Teller Strength of the Sn100 Beta Decay

Improved Value for the Gamow-Teller Strength of the Sn100 Beta Decay

New and comprehensive β - and βp -decay spectroscopy results in the vicinity of Sn100

Mass measurements of 99–101In challenge ab initio nuclear theory of the nuclide 100Sn

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