First lifetime investigations of 
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 iodine isotopes: The quest for collectivity

Häfner, G.; Lozeva, R.; Naïdja, H.; Lebois, M.; Jovančević, N.; Thisse, D.; Étasse, D.; Canavan, R.; Rudigier, M.; Wilson, J. N.; Adamska, Edyta; Adsley, P.; Algora, A.; Babo, M.; Belvedere, K.; Benito, J.; Blazhev, A.; Boso, A.; Bottoni, S.; Bunce, M.; Chakma, R.; Cieplicka-Oryńczak, N.; Collins, S.M.; Cortés, M. L.; Davies, P.; Delafosse, C.; Fallot, M.; Fraile, L. M.; Gerst, R.-B.; Gjestvang, D.; Guadilla, V.; Hauschild, K.; Henrich, C.; Homm, I.; Ibrahim, F.; Iskra, Ł. W.; Jazwari, S.; Korgul, A.; Koseoglou, P.; Kroll, Thilo; Kurtukian‐Nieto, T.; Le-meur, L.; Leoni, S.; Ljungvall, J.; Лопез-Мартенс, А.; Lebois, M.; Miernik, K.; Nemer, J.; Oberstedt, S.; Paulsen, W.; Piersa-Siłkowska, M.; Popovitch, Y.; Porzio, C.; Qi, Liqiang; Ralet, D.; Regan, P. H.; Tello, D. Reygadas; Rezynkina, K.; Sánchez-Tembleque, V.; Schmitt, C.; Söderström, P.-A.; Sürder, C.; Tocabens, G.; Vedia, V.; Verney, D.; Warr, N.; Wasilewska, B.; Wiederhold, J.; Yavahchova, M. S.; Zeiser, F.; Ziliani, S.

doi:10.1103/physrevc.104.014316

Cited by 2 publications

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“…In recent years, lifetime measurements of a number of excited states in 134,135,136,138 Te, 135,137,139 I and 138,140,142 Xe [90][91][92][93][94], performed by fast-timing techniques with mixed arrays (i.e., EXILL [29] and nu-Ball [31] coupled to LaBr 3 detectors), provided additional information on B(E2) values, to be confronted with shell model calculations based on different interactions (see Fig. 12).…”

Section: The 132 Sn Doubly Magic Shell Closurementioning

confidence: 99%

“…12). The data allow to test predictions for the two-and three-valence protons isotopic chains with N = 82, 84 and 86 [90,91], also Fig. 11 Comparisons between experimental energies (triangles) and shell-model predictions (circles) for corresponding low-lying proton-neutron multiplets in 134 Sb (b) and 210 Bi (c), 136 Sb (f) and 212 Bi (g), and 136 I (l) and 212 At (m).…”

Section: The 132 Sn Doubly Magic Shell Closurementioning

confidence: 99%

“…12 and Refs. [90,91,143,144,168]). The challenge in this kind of studies is the efficiency for channel selection via γ rays.…”

Section: Fast Timingmentioning

confidence: 99%

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Gamma-ray spectroscopy of fission fragments with state-of-the-art techniques

2022

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The paper reviews recent developments in $$\gamma $$ γ -ray spectroscopy of the neutron-rich fragments produced in nuclear fission. This subject has been an intensive area of study spanning more than five decades. Here we highlight key results and describe the evolution of the associated experimental techniques since the last review papers in 1995 (I. Ahmad and W.R. Phillips, Rep. Prog. Phys. 58(11), 1415 (1995); J. H. Hamilton et al., Prog. Part. Nucl. Phys. 35, 635(1995)). Research themes in nuclear structure will be explored along with the fission reaction mechanism and the links to nuclear astrophysics and applications.

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Section: The 132 Sn Doubly Magic Shell Closurementioning

confidence: 99%

Section: The 132 Sn Doubly Magic Shell Closurementioning

confidence: 99%

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Gamma-ray spectroscopy of fission fragments with state-of-the-art techniques

2022

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New β -decay spectroscopy of the Te137 nucleus

Lozeva

Naïdja

et al. 2022

Phys. Rev. C

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Background: Nuclear structure of the neutron-rich isotopes beyond 132 Sn is investigated. Purpose:The level scheme of 137 I is obtained after decay of 137 Te. Transitions in 136 I are detected after delayed neutron emission of 137 Te. The half life of 137 Te is measured.Methods: -delayed -ray spectroscopy is employed for neutron-rich 137 Sb and 137 Te isotopes, produced at the ILL after neutron-induced fission to populate excited states in 137 I. Results:The new decay level scheme of 137 I is established. The half lives of 137 Sb and 137 Te are determined as 0.57(26) s and 2.46(5) s, respectively. The -delayed neutron emission probability P limiting value of 137 Te is deduced to be 2.17(66)%. Conclusions:The experimental results are an important input to the theoretical description of nuclei in the region, being well interpreted within LSSM calculations and provide essential information on the firstforbidden transitions beyond > 82 and > 50. I. INTRODUCTION AND MOTIVATION Closeto the double shell closures in the nuclear chart with one of the good examples being the 132 50 Sn 82 doubly-magic nucleus, the nuclear shell model stays a major structural framework to understand such magic nuclei and their neighbours. By investigating the nuclear configuration of states around the 132 Sn core, the extension of the magic core may be traced and the polarization effect of valence particles on the 132 Sn core may be studied in detail [1]. Valuable information on the nucleon-nucleon effective interaction and single-particle excitation energies may also be obtained. Furthermore, with increasing the neutron excess for these nuclei, a variety of new phenomena are predicted as the existence of neutron skin, vanishing of standard magic numbers or opening of new sub-shell gaps [2-5]. These phenomena challenge recent competitive studies and boost the quest for new data to more and more neutron-rich species. In our previous review on 136 Te which has two valence protons and two valence neutrons outside the doubly-magic 132 Sn core, deviations of the observed transition rates from the ones predicted by the shell-model calculation are found [6]. It is of great interest to investigate the Iodine isotopic chain, where in our review in [7] of 136 Te decay, the excited levels of 136 I were established and compared to the shell model. In the present work new excited states also are identified in three valence protons systems beyond the magic number = 50. One of them, the 137 I nucleus, which has two valence neutrons outside the closed neutron shell = 82 is of particular interest since also its low-spin excitations have not been explored in detail, while being very important for the nuclear structure in the region. Intermediate-spin states are addressed in our review on 135−139 I nuclei [8]. The excess of valences particles could polarize the 132 Sn 56 core and could lead to collective behaviour in 137 I, a quantity 57 of information on the shell evolution of nuclei is expected at 58 such extreme proton-neutron ratios. However, these I n...

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First lifetime investigations of N>82 iodine isotopes: The quest for collectivity

Cited by 2 publications

References 59 publications

Gamma-ray spectroscopy of fission fragments with state-of-the-art techniques

Gamma-ray spectroscopy of fission fragments with state-of-the-art techniques

New β -decay spectroscopy of the Te137 nucleus

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