Isomer studies in the vicinity of the doubly-magic nucleus 100Sn: Observation of a new low-lying isomeric state in 97Ag

Hornung, C.; Amanbayev, Daler; Dedes, I.; Kripko-Koncz, Gabriella; Miskun, Ivan; Shimizu, Noritaka; Andrés, Samuel Ayet San; Bergmann, J.; Dickel, T.; Dudek, J.; Ebert, Jens; Geißel, H.; Górska, M.; Grawe, H.; Greiner, Florian; Haettner, E.; Otsuka, Takaharu; Plaß, W. R.; Purushothaman, S.; Rink, Ann-Kathrin; Scheidenberger, C.; Weick, H.; Bagchi, S.; Blazhev, A.; Charviakova, Olga; Curien, D.; Finlay, A.; Kaur, Satbir; Lippert, W.; Otto, Jan-Hendrik; Patyk, Z.; Piétri, S.; Tanaka, Y. K.; Tsunoda, Y.; Winfield, J. S.

doi:10.1016/j.physletb.2020.135200

Cited by 29 publications

(15 citation statements)

References 66 publications

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“…For the mass measurement of such nuclei, which are mostly very short-lived (10s of ms) and with low production cross sections, an optimal device is the multiple-reflection timeof-flight mass spectrometer (MR-TOF-MS) [24], which is sensitive even to nuclei that are produced at rates as low as a few events per hour or day [25,26]. The MR-TOF-MS has a unique combination of performance parameters: fast (cycle times of a few ms), accurate (relative mass-measurement uncertainty down to the 10 −8 level), sensitive (only a few detected ions per nucleus are required for accurate mass determination), nonscanning (simultaneous measurement of many different nuclei), and can be used to spatially resolve isobars and even isomers [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Mass measurements of As, Se, and Br nuclei, and their implication on the proton-neutron interaction strength toward the N=Z line

Mardor¹,

Andrés²,

Dickel³

et al. 2021

Phys. Rev. C

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Section: Introductionmentioning

confidence: 99%

Mass measurements of As, Se, and Br nuclei, and their implication on the proton-neutron interaction strength toward the N=Z line

Mardor¹,

Andrés²,

Dickel³

et al. 2021

Phys. Rev. C

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“…The high mass resolving power offered by the PI-ICR method enables simultaneous measurement of the hyperfine structure of multiple long-lived, ( t 1/2 > 100 ms), nuclear states with mass differences as low as ~10 keV, in an essentially background-free manner. However, even though long-lived low-spin isomers have been observed in nearby silver isotopes 3 , 25 , 26 , the cross-section for producing these states with our reaction is orders of magnitude smaller than for the higher-spin states. Thus, an isomeric state was only observed for the high-yield case of 99 Ag ( E ex = 506.2 keV, I = (1/2 − )) within the time constraints of the measurement.…”

Section: Resultsmentioning

confidence: 69%

Evidence of a sudden increase in the nuclear size of proton-rich silver-96

Reponen

Groote

et al. 2021

Nat Commun

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Understanding the evolution of the nuclear charge radius is one of the long-standing challenges for nuclear theory. Recently, density functional theory calculations utilizing Fayans functionals have successfully reproduced the charge radii of a variety of exotic isotopes. However, difficulties in the isotope production have hindered testing these models in the immediate region of the nuclear chart below the heaviest self-conjugate doubly-magic nucleus 100Sn, where the near-equal number of protons (Z) and neutrons (N) lead to enhanced neutron-proton pairing. Here, we present an optical excursion into this region by crossing the N = 50 magic neutron number in the silver isotopic chain with the measurement of the charge radius of 96Ag (N = 49). The results provide a challenge for nuclear theory: calculations are unable to reproduce the pronounced discontinuity in the charge radii as one moves below N = 50. The technical advancements in this work open the N = Z region below 100Sn for further optical studies, which will lead to more comprehensive input for nuclear theory development.

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“…Thus the excitation energy of the 1/2 − isomer reflects the energy gap between the π2p 1/2 and π1g 9/2 orbitals. Recent studies of these isomer excitation energies for neutron-deficient indium [50,51] have demonstrated the sensitivity of this gap to neutron occupation numbers. The JYFLTRAP measurements of 129 In and 131 In isomers [43] clarified the trend of the 1/2 − excitation energy up to the N = 82 shell closure.…”

Section: Inmentioning

confidence: 99%

Mass measurements of neutron-rich indium isotopes for r -process studies

Izzo¹,

Bergmann²,

Dietrich³

et al. 2021

Phys. Rev. C

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A new series of neutron-rich indium mass measurements are reported from the TITAN multiplereflection time-of-flight mass spectrometer (MR-TOF-MS). These mass measurements cover 125−134 In (N = 76 − 85) and include ground states as well as isomeric states. The masses of nuclei in this region are known to be of great importance for accurately modeling r-process nucleosynthesis, and the significance of the reported neutron-rich indium masses is discussed in this context. Results are compared with earlier experimental data where available as well as theoretical mass models. The measurements reported here include the first mass measurements of 133,134 In, as well as the first direct mass measurement of 132 In. The masses of 125−131 In ground states and several isomers were previously measured to higher precision by Penning trap mass spectrometry, which also resolved some low-lying isomers that could not be resolved in this work. The earlier Penning trap measurements serve as excellent cross-checks for the MR-TOF-MS measurements, and in some cases the MR-TOF-MS measurements improve the literature uncertainties of higher-lying isomer masses and excitation energies. A new isomeric state for 128 In, recently reported for the first time by the JYFLTRAP group, is also confirmed by the TITAN MR-TOF-MS, with a measured excitation energy of 1813(17) keV.

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Isomer studies in the vicinity of the doubly-magic nucleus 100Sn: Observation of a new low-lying isomeric state in 97Ag

Cited by 29 publications

References 66 publications

Mass measurements of As, Se, and Br nuclei, and their implication on the proton-neutron interaction strength toward the N=Z line

Mass measurements of As, Se, and Br nuclei, and their implication on the proton-neutron interaction strength toward the N=Z line

Evidence of a sudden increase in the nuclear size of proton-rich silver-96

Mass measurements of neutron-rich indium isotopes for r -process studies

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