Beta decay of the new isotope<sup>101</sup>Sn

Janas, Z.; Keller, H.; Kirchner, R.; Klepper, O.; Piechaczek, A.; Roeckl, E.; Schmid, K.W.; Huyse, M.; Schwarzenberg, J. von; Szerypo, J.; Duppen, P. Van; Vermeeren, L.; Albus, F.; Kluge, H.‐J.; Passler, G.; Scheerer, F.; Trautmann, Ν.; Fedoseyev, V. N.; Mishin, V. I.; Grzwacz, R; Płochocki, A.; Rykaczewski, K. P.; Ż̷ylicz, J.

doi:10.1088/0031-8949/1995/t56/044

Cited by 20 publications

(6 citation statements)

References 19 publications

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“…Beyond silver, our combination of techniques can be used to study other elements in the N = Z region near 100 Sn. Cross-section calculations, validated by experiments at the GSI Helmholtzzentrum für Schwerionenforschung 7 , 21 , 46 – 50 , together with high laser ionization efficiencies 51 , 52 and our primary beam intensities suggest 93 Pd, 97 Cd, 100 In, and 101 Sn are within reach, as highlighted in Fig. 3 .…”

Section: Discussionsupporting

confidence: 69%

“…Secondly, we implemented a hot-cavity catcher laser ion source 20 , 21 for fast, high-efficiency stopping, and extraction of these reaction products 22 , 23 . The produced silver nuclei, which recoil out of the target, implant into a hot graphite catcher from where they promptly diffuse out into the catcher cavity as atoms, before effusing into a transfer tube.…”

Section: Resultsmentioning

confidence: 99%

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

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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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Section: Discussionsupporting

confidence: 69%

Section: Resultsmentioning

confidence: 99%

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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“…The fluorination source was used to investigate the isotopes Ba and, in particular, to determine the i Ba source strength by P-counting as well as the ratio of the delayed-proton rates following the P decays of Ba and Ba. The latter ratio, together with the delayed-proton emission probability measured for ii4Ba [16], was used to determine the Ba source strength with the hightemperature cavity, where the strong Cs contamination prevents a direct measurement.…”

mentioning

confidence: 99%

“…This was [20]). for i Ba, will be given in [16]. From the measured intensity of the BaF+ beam and its total separation efficiency of 11+s% (for the determination, see [15]), we were able to deduce the Ni( Ni, 2n) Ba cross section.…”

mentioning

confidence: 99%

“…This 10 limit includes the uncertainties of (i) one event (+ss& ') per 50-keV interval for an n-energy range of the AE-anticoincidence spectrum between 1 and 4 MeV, (ii) the number of P-delayed protons observed simultaneously in the AE Etelescope (-+6%), and (iii) the measured [16] delayed-proton emission probability of i~4Ba and its decay daughters (+30%). The corresponding lower limit on the partial half-life for o. decay is 1.2 x 10 s. Table I summarizes the results of our measurements.…”

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Identification of the new isotopeBa114and search for its α and cluster radioactivity

et al. 1995

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Using the on-line mass separator at the Gesellschaft fur Schwerionenforschung Unilac we produced Ba through the Ni( Ni, 2n) Ba reaction and measured its production cross section to be 0.20+o 09 pb. The new isotope Ba represents the heaviest N = Z+ 2 nucleus known to date. With KE-E telescopes we measured the total (P-decay) half-life to be Tp = 0.43+o~s s and the partial o.-decay half-life to be T ) 1.2 x 10 s (1 Mev( E' ( 4 MeV) for Ba. With track detectors we found a half-life for spontaneous C emission T& & 1.1 x 10 s based on three carbon events. PACS number(s): 23.70. +j, 23.60.+e, 25.70.Jj, 27.60. +jCluster radioactivity is now a well established, although rare, decay mode of heavy nuclei. Intense experimental research in the last decade has led to the detection of 20 cases of spontaneous emission of clusters ranging from C to Si from trans-lead nuclei, with branching ratios relative to o, decay &om 10 down to 10 and partial half-lives from 10~u p to 10 s [1]. The general features of this new radioactive decay mode have been established; above all, its strong dependence on the barrier penetration factor and consequently on the Q value, which must be large in order to compensate for the small preformation factors typical of such complew clusters [2]. For this reason, all heavy residual nuclei resulting &om cluster emission have been found so far to differ &om the doubly magic Pb by three nucleons at most. Analogously, a new island of cluster radioactivity having residual nuclei close to doubly magic Sn has been predicted by Greiner et al. and Poenaru et al. [3,4]. They found the most favorable case to be C emission from Ba and calculated the decay rate using various mass predictions [5] for the then unknown Ba nucleus. The results of their predictions strongly depend on the adopted Q value: a 2-MeV spread in the Q values results in a factor 10 spread in the partial half-lives. More recently others [6 -10] have taken up the challenge of calculating the decay rate for C emission from~~Ba; their results for the same choice of Q value span more than eight orders of magnitude. This situation is in complete contrast with what is found in the translead region of cluster radioactivity, where Q values are generally known and all models predict half-lives for the same decay mode that typically agree within an order of magnitude [11]. It is clear that the possible island of cluster radioactivity in the trans-tin region would be interesting to ex-plore. Apart &om the possibility of discriminating among different theoretical approaches, the mere detection and measurement of the partial C decay rate of 4Ba could shed light on the behavior of cluster radioactivity in this region of the Chart of the Nuclides far below Pb, possibly providing information on the interplay with o. decay and on the role of the nearly double shell closure in a nucleus such as Sn far from the stability line. The first searches for

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