<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-decay studies of neutron-rich Tl, Pb, and Bi isotopes

Morales, A. I.; Benzoni, G.; Gottardo, A.; Valiente-Dobón, J. J.; Blasi, N.; Bracco, A.; Camera, F.; Crespi, F. C. L.; Corsi, A.; Leoni, S.; Million, B.; Nicolini, R.; Wieland, O.; Gadea, A.; Lunardi, S.; Górska, M.; Regan, P. H.; Podolyák, Zs.; Pfützner, M.; Piétri, S.; Boutachkov, P.; Weick, H.; Grȩbosz, J.; Bruce, A. M.; Núñez, J. Alcántara; Algora, A.; Al‐Dahan, N.; Ayyad, Y.; Alkhomashi, N.; Allegro, P.R.P.; Bazzacco, D.; Benlliure, J.; Bowry, M.; Bunce, M.; Casarejos, E.; Cortés, M. L.; Bacelar, A. M. Denis; Deo, A. Y.; Angelis, G. de; Domingo‐Pardo, C.; Doncel, M.; Dombrádi, Zs.; Engert, T.; Eppinger, K.; Farrelly, G. F.; Farinon, F.; Farnea, E.; Geißel, H.; Gerl, J.; Goel, N.; Gregor, E.; Habermann, T.; Hoischen, R.; Janik, R.; Klupp, S.; Kojouharov, I.; Kurz, N.; Mandal, S.; Menegazzo, R.; Mengoni, D.; Napoli, D. R.; Naqvi, F.; Nociforo, C.; Procházka, A.; Prokopowicz, W.; Recchia, F.; Ribas, Roberto Vicençotto; Reed, M. W.; Rudolph, Dirk; Şahin, E.; Schaffner, H.; Sharma, A.; Sitár, B.; Siwal, Davinder; Steiger, Katja; Strmeň, P.; Swan, T.; Szarka, I.; Ur, C. A.; Walker, P. M.; Wollersheim, H. J.

doi:10.1103/physrevc.89.014324

Cited by 36 publications

(27 citation statements)

References 41 publications

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“…In the present Letter, we report on the half-lives of [200][201][202] 204 Pt is the lightest N ¼ 126 isotone for which β-decay data are presently available. These results are combined together with other 19 half-lives measured during the "stopped beam" campaign of the rare isotope investigations at GSI (RISING) collaboration [25][26][27][28][29][30] to provide the first systematic comparison with theoretical predictions across the N ¼ 126 shell closure. The location of the nuclei in the Segrè chart is shown in Fig.…”

Section: Infn-laboratori Nazionali DI Legnaro I-35020 Legnaro Italymentioning

confidence: 99%

Half-Life Systematics across theN=126Shell Closure: Role of First-Forbidden Transitions in theβDecay of Heavy Neutron-Rich Nuclei

et al. 2014

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This Letter reports on a systematic study of β-decay half-lives of neutron-rich nuclei around doubly magic 208 Pb. The lifetimes of the 126-neutron shell isotone 204 Pt and the neighboring [200][201][202] Ir, 203 Pt, 204 Au are presented together with other 19 half-lives measured during the "stopped beam" campaign of the rare isotope investigations at GSI collaboration. The results constrain the main nuclear theories used in calculations of r-process nucleosynthesis. Predictions based on a statistical macroscopic description of the first-forbidden β strength reveal significant deviations for most of the nuclei with N < 126. In contrast, theories including a fully microscopic treatment of allowed and first-forbidden transitions reproduce more satisfactorily the trend in the measured half-lives for the nuclei in this region, where the r-process pathway passes through during β decay back to stability. DOI: 10.1103/PhysRevLett.113.022702 PACS numbers: 25.70.Mn, 23.40.-s, 26.30.Hj, 27.80.+w In very hot, neutron-rich stellar environments, the r process of nucleosynthesis is ignited in a series of rapid neutron captures on seed nuclei of the Fe group, thus creating very exotic neutron-rich nuclei that β decay back to stability around the neutron shell closures with N ¼ 50, 82, and 126. In these "waiting-point" regions, matter is accumulated at masses A ∼ 80, 130, and 195, thus creating the so-called first, second, and third r-abundance peaks. These basic features of the r process were established more than half a century ago [1]. However, how the heavy nuclei from Ni to U are synthesized is one of the major unanswered questions of modern physics because of the large uncertainties in the path, time scale, and astrophysical conditions for the rapid neutron capture process to develop [2]. Observational constraints such as the elemental abundances in metal-poor stars or in solar system material help to determine astronomical sites where it might occur [3,4]. Concurrently, β-decay properties of very exotic nuclei near the path, such as β half-lives, are critical in determining the observed abundances [5]. Since many of the r-process progenitors cannot be accessed with present radioactive ion beam facilities, estimates of r-process nucleosynthesis generally rely upon predictions of stateof-the-art nuclear models, based on the properties of nuclei far from stability [6][7][8][9][10][11]. But at extreme values of isospin, theoretical predictions may be biased by microscopic structural effects that modify the shape of the β-strength function, such as nuclear shell quenching or deformation [12,13]. Until now, such theories have only been tested with information on β decay around the first two waiting points

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Section: Infn-laboratori Nazionali DI Legnaro I-35020 Legnaro Italymentioning

confidence: 99%

Half-Life Systematics across theN=126Shell Closure: Role of First-Forbidden Transitions in theβDecay of Heavy Neutron-Rich Nuclei

et al. 2014

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“…In the present experiment, due to the presence of the active stopper with its casing, the absolute efficiency of the array was ∼13% at 662 keV. The time correlation between the γ rays and the ions detected with the active stopper allowed one to perform at the same time isomer spectroscopy and β-delayed γ -ray spectroscopy [14,15]. Figure 2 shows the γ -ray spectrum following the detected isomeric decay of 217 Bi.…”

Section: Methodsmentioning

confidence: 66%

“…Nearby isotopes were also effectively populated for the first time, up to mass number 219 for the bismuth nuclei and to mass 210 for the mercury isotopes [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Isomeric decay spectroscopy of theBi217isotope

Gottardo¹,

Lunardi²,

Gadea³

et al. 2014

Phys. Rev. C

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The structure of the neutron-rich bismuth isotope 217 Bi has been studied for the first time. The fragmentation of a primary 238 U beam at the FRS-RISING setup at GSI was exploited to perform γ -decay spectroscopy, since μs isomeric states were expected in this nucleus. Gamma rays following the decay of a t 1/2 = 3 μs isomer were observed, allowing one to establish the low-lying structure of 217 Bi. The level energies and the reduced electric quadrupole transition probability B(E2) from the isomeric state are compared to large-scale shell-model calculations.

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“…Their yields vary from < 1 to > 10 8 atoms per second, depending on the reaction cross section, the diffusion and effusion properties of the target, and the half-life of each isotope [46]. In the region of A ≥ 220, the yields are 10 7 ions per second [46], while the predicted yields of the isobaric polonium atoms are < 10 3 . In order to demonstrate the suitability of the LIST in the region of the nuclear chart with A ∼ 220, the suppression of 218 Fr has been studied.…”

Section: A Suppression Of Surface-ionized Ionsmentioning

confidence: 99%

“…This region is inaccessible by fusion-evaporation reactions with beams of stable nuclei, while the cross section for fragmentation and spallation of heavier nuclei is distributed over a wide range of isotopes, leaving those of interest hidden by more abundant contaminants. A great effort has nonetheless been invested in recent years to study nuclei far beyond the nuclear magic number N ¼ 126, due to their importance for the shell evolution away from nuclear stability, for astronuclear processes, and for the search for physics beyond the standard model in octupole-deformed atomic nuclei [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

In-Source Laser Spectroscopy with the Laser Ion Source and Trap: First Direct Study of the Ground-State Properties ofPo217,219

Fink¹,

Cocolios²,

Andreyev³

et al. 2015

Phys. Rev. X

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A Laser Ion Source and Trap (LIST) for a thick-target, isotope-separation on-line facility has been implemented at CERN ISOLDE for the production of pure, laser-ionized, radioactive ion beams. It offers two modes of operation, either as an ion guide, which performs similarly to the standard ISOLDE resonance ionization laser ion source (RILIS), or as a more selective ion source, where surface-ionized ions from the hot ion-source cavity are repelled by an electrode, while laser ionization is done within a radiofrequency quadrupole ion guide. The first physics application of the LIST enables the suppression of francium contamination in ion beams of neutron-rich polonium isotopes at ISOLDE by more than 1000 with a reduction in laser-ionization efficiency of only 20. Resonance ionization spectroscopy is performed directly inside the LIST device, allowing the study of the hyperfine structure and isotope shift of 217 Po for the first time. Nuclear decay spectroscopy of 219 Po is performed for the first time, revealing its half-life, α-to-β-decay branching ratio, and α-particle energy. This experiment demonstrates the applicability of the LIST at radioactive ion-beam facilities for the production and study of pure beams of exotic isotopes.

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β-decay studies of neutron-rich Tl, Pb, and Bi isotopes

Cited by 36 publications

References 41 publications

Half-Life Systematics across theN=126Shell Closure: Role of First-Forbidden Transitions in theβDecay of Heavy Neutron-Rich Nuclei

Half-Life Systematics across theN=126Shell Closure: Role of First-Forbidden Transitions in theβDecay of Heavy Neutron-Rich Nuclei

Isomeric decay spectroscopy of theBi217isotope

In-Source Laser Spectroscopy with the Laser Ion Source and Trap: First Direct Study of the Ground-State Properties ofPo217,219

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