Observation of new microsecond isomers among fission products from in-flight fission of 345 MeV/nucleon<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>238</mml:mn></mml:msup></mml:math>U

Kameda, D.; Kubo, T.; Ohnishi, T.; Kusaka, K.; Yoshida, Akihiro; Yoshida, Kôichi; Ohtake, M.; Fukuda, N.; Takeda, Hiroyuki; Inabe, N.; Yanagisawa, Y.; Gono, Y.; Watanabe, H.; Otsu, H.; Baba, H.; Ichihara, T.; Yamaguchi, Yoshitaka; Takechi, M.; Nishimura, S.; Ueno, H.; Yoshimi, A.; Sakuraï, H.; Motobayashi, T.; Nakao, T.; Mizoi, Y.; Matsushita, M.; Ieki, K.; Kobayashi, N.; Tanaka, K.; Kawada, Y.; Tanaka, Naoki; Deguchi, S.; Satou, Y.; Kondo, Y.; Nakamura, Takashi; Yoshinaga, K.; Ishii, Chikako; Yoshii, H.; Miyashita, Y.; Uematsu, N.; Shiraki, Y.; Sumikama, T.; Chiba, J.; Ideguchi, E.; Saito, A.; Yamaguchi, Takayuki; Hachiuma, I.; Suzuki, Toshio; Moriguchi, T.; Ozawa, A.; Ohtsubo, T.; Famiano, M.; Geißel, H.; Nettleton, A. S.; Tarasov, O.; Bazin, D.; Sherrill, B. M.; Manikonda, S.; Nolen, J.A.

doi:10.1103/physrevc.86.054319

Cited by 158 publications

(85 citation statements)

References 97 publications

(246 reference statements)

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“…This assignment is in agreement with the conclusions of a recent theoretical study of odd-A Rb isotopes [34]. The isomeric E1 transition that has since been identified in 97 Rb probably originates from a negative parity Nilsson configuration [14,15].…”

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confidence: 80%

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Rb973760: The Cornerstone of the Region of Deformation aroundA

et al. 2015

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Excited states of the neutron-rich nuclei97;99 Rb were populated for the first time using the multistep Coulomb excitation of radioactive beams. Comparisons of the results with particle-rotor model calculations provide clear identification for the ground-state rotational band of 97 Rb as being built on the πg 9=2 ½431 3=2 þ Nilsson-model configuration. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N ¼ 60 and rotational bands above. The present study defines the limits of the deformed region around A ∼ 100 and indicates that the deformation of 97 Rb is essentially the same as that observed well inside the deformed region. It further highlights the power of the Coulomb-excitation technique for obtaining spectroscopic information far from stability. The 99 Rb case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams. DOI: 10.1103/PhysRevLett.115.172501 PACS numbers: 27.60.+j, 23.20.Lv, 25.70.De, 29.38.-c The spherical symmetry of atomic nuclei is well established for the cases where both the proton (Z) and neutron (N) numbers are near magic numbers. Most atomic nuclei, however, have nonspherical shapes. The best-known and well-studied region of prolate-deformed nuclei is the "rare-earth region," centered between 50 < Z < 82 and 82 < N < 126. A less known region of deformed nuclei, which is predicted to show even larger deformations [1], is centered around mass 100 (A ∼ 100) between the 28 < Z < 50 and 50 < N < 82 major shells. These nuclei are neutron rich, and well away from the valley of stability, so they are challenging to study experimentally.The A ∼ 100 prolate-deformed Sr-Zr region (Z ¼ 38; 40) has attracted considerable attention since its prediction [2] and experimental observation [3]. Spectroscopic studies of these neutron-rich nuclei were undertaken at on-line mass separators and by γ-ray spectroscopy in spontaneous fission [4][5][6]. A key feature is the sudden onset of deformation when progressing from neutron number N ¼ 58 to N ¼ 60. However, the abrupt change of the deformation quickly washes out when moving away from Z ¼ 38 [4].Nuclei at the border of this deformed region, in which the addition or the removal of a single nucleon results in a large shape change, hold the key to its understanding. Tracking

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“…An excited rotational band was observed in 96 Rb 59 [13] providing evidence for shape coexistence in that nucleus. During the data analysis of the present work an isomeric E1 transition in 97 Rb was reported [14,15].…”

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confidence: 99%

Rb973760: The Cornerstone of the Region of Deformation aroundA

et al. 2015

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“…[2] Skalski et al pointed to strong shape variations due to the predicted coexistence of prolate and oblate potential minima and a γ softness expected in Mo-Pd nuclei. Many examples of these phenomena have been observed experimentally in the 100 < A < 120 region, especially effects related to γ softness and triaxiality in neutron-rich Mo-Pd isotopes [4][5][6][7][8][9][10][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

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confidence: 98%

Excited levels in the multishaped Pd117 nucleus studied via β decay of Rh117

et al. 2018

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Monoisotopic samples of exotic, neutron-rich 117 Rh nuclei, produced in the proton-induced fission of 238 U and separated using the IGISOL mass separator coupled to the JYFLTRAP Penning trap, were used to perform β and γ coincidence spectroscopy of 117 Pd. The spin parity of the ground state of 117 Pd was determined to be 1/2 + and the 19.1 ms isomer at 203.2 keV was assigned a spin-parity 7/2 − . The 117 Rh β − -decay scheme was considerably extended, and various sequences of the levels were interpreted as resulting from the prolate, oblate, and triaxial nuclear shapes. Some of the β − decays were considered as the allowed Gamow-Teller transitions. The experimental distribution of Gamow-Teller strength is discussed.

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“…The configuration, the K value, and the energy are predicted in [10]. A recent paper reported the γ ray spectrum from the 108 Zr isomer from a different data set [11]. Additional information was obtained about new γ rays, their intensities, and coincidence relationships, and a new decay scheme was proposed.…”

Section: Isomeric State In 108 Zrmentioning

confidence: 99%

Decay Spectroscopy of Neutron-rich Nuclei in the Vicinity of <sup><span class="cmr-7">110</span></sup>Zr at RIBF

Sumikama¹

2013

Acta Phys. Pol. B

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The decay spectroscopy of 106,108 Zr has been performed as a first decay spectroscopy experiment at the RIKEN Radioactive Isotope Beam Factory (RIBF). The γ rays emitted from 106 Zr and 108 Zr were measured in the β decay of 106 Y and in the decay of the 108 Zr isomer, respectively. The deformation evolution of the Zr isotopes and the isomerism of 108 Zr are discussed. The EUROBALL-RIKEN Cluster Array (EURICA) spectrometer used for the decay spectroscopy with high statistics at RIBF is introduced.

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Observation of new microsecond isomers among fission products from in-flight fission of 345 MeV/nucleon238U

Cited by 158 publications

References 97 publications

Rb973760: The Cornerstone of the Region of Deformation aroundA

Rb973760: The Cornerstone of the Region of Deformation aroundA

Excited levels in the multishaped Pd117 nucleus studied via β decay of Rh117

Decay Spectroscopy of Neutron-rich Nuclei in the Vicinity of <sup><span class="cmr-7">110</span></sup>Zr at RIBF

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