Penning-trap-assisted study of excitations in 
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 populated in 
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 decay of 
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Czerwiński, M.; Sieja, K.; Rza̧ca‐Urban, T.; Urban, W.; Płochocki, A.; Kurpeta, J.; Wiśniewski, Jarosław A.; Penttilä, H.; Jokinen, A.; Rinta‐Antila, S.; Cañete, L.; Eronen, T.; Hakala, J.; Kankainen, A.; Kolhinen, V. S.; Koponen, J.; Moore, I. D.; Pohjalainen, I.; Reinikainen, Juuso; Simutkin, Vasily; Voss, A.; Murray, I.; Nobs, C.R.

doi:10.1103/physrevc.95.024321

Cited by 7 publications

(16 citation statements)

References 26 publications

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“…In addition to s.p. excitations involving π f 5 5/2 , π p 1 3/2 , and π p 1 1/2 structures, the shell model predicts a number of excitations with moderate collectivity, which also fit well the experimental scheme.…”

Section: Discussionsupporting

confidence: 71%

“…Full diagonalizations in the model space were achieved. Similar calculations were performed in our previous works on N = 52 and N = 53 isotones [2][3][4][5]38].…”

Section: B Shell-model Calculationssupporting

confidence: 59%

“…Evolution of nuclear collectivity in nuclei remains one of the most important aspects of nuclear structure studies. This work is a continuation of our previous studies in the "northeast" region of 78 Ni [1][2][3][4][5][6]. Of particular interest is the understanding of how collectivity evolves above the N = 50 closed shell.…”

Section: Introductionmentioning

confidence: 60%

“…Furthermore, this collectivity coupled to a s.p. orbital with spin j, occupied by a few nucleons, may result in the socalled anomalous coupling, producing a multiplet of closelying states with spins j, j − 1, j − 2 [30], as observed in N = 53 even-odd isotones in this region [2][3][4][5]. Such states, also called "dressed" [31,32] can be interpreted as seniority coupling [33] or, more generally though less specific, as being due to the so-called Jahn-Teller effect [34], which removes the degeneracy of an orbital populated by several particles due to coupling to a collective excitation.…”

Section: A Proposed Interpretation Of Levelsmentioning

confidence: 92%

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Excited states in Br87 populated in β decay of Se87

et al. 2019

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Excited levels in 87 Br, populated in β decay of 87 Se, have been studied by means of γ-ray spectroscopy using an array of broad energy Ge detectors. 87 Se nuclei were produced by irradiating a natural Th target with 25-MeV protons. Fission products were extracted from the target chamber using the IGISOL technique, then separated on a dipole magnet and Penning trap (JYFLTRAP) setup. The scheme of excited levels of 87 Br has been significantly extended. 114 new transitions and 51 new levels were established. β feedings and log(f t) values of levels were determined. The upper limit for β feeding to the ground state of 87 Br was determined to be 23(5)%. Ground state spin and parity 5/2 − was confirmed, as suggested by previous studies. We also confirm the low-energy excited state at 6.02 keV. The ground state and two lowest excited states in 87 Br were interpreted as the (π f 5/2) 3 j, j−1, j−2 triplet produced by the so-called anomalous coupling. The 333.61-and 699.26-keV levels were interpreted as π p 3/2 and π p 1/2 single-particle excitations. The 9/2 + level reported previously as corresponding to the π g 9/2 single-particle excitation is proposed to be an isomer with half-life 20 ns. Large-scale shell-model calculations performed in this work are in good agreement with experimental results.

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Section: Discussionsupporting

confidence: 71%

“…Full diagonalizations in the model space were achieved. Similar calculations were performed in our previous works on N = 52 and N = 53 isotones [2][3][4][5]38].…”

Section: B Shell-model Calculationssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 60%

Section: A Proposed Interpretation Of Levelsmentioning

confidence: 92%

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Excited states in Br87 populated in β decay of Se87

et al. 2019

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“…Since the last LASER meeting held in May 2016 in Poznan, several trap-assisted spectroscopy studies employing JYFLTRAP have been published. A beta detector and an array of broad-energy range germanium detectors have been used to study the beta decays of 88 Se [64] and 117 Rh [65]. The TASISpec silicon detector array together with a cluster and clover detectors were employed to study beta decay of 127 Cd [66].…”

Section: Other Activities At Jyfltrapmentioning

confidence: 99%

Recent experiments at the JYFLTRAP Penning trap

et al. 2020

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The JYFLTRAP double Penning trap mass spectrometer at the Ion Guide Isotope Separator On-Line (IGISOL) facility offers excellent possibilities for high-precision mass measurements of radioactive ions. Around 400 atomic masses, including around 50 isomeric states, have been measured since JYFLTRAP became operational. JYFLTRAP has also been used as a high-resolution mass separator for decay spectroscopy experiments as well as an ion counter for fission yield studies. In this contribution, an overview of recent activities at the JYFLTRAP Penning trap is given, with a focus on nuclei discussed in the PLATAN2019 meeting.

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Medium-spin states of the neutron-rich nucleus Br87

et al. 2021

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Medium-spin excited states of the neutron-rich nucleus 87 Br were observed and studied for the first time. They were populated in fission of 235 U induced by the cold-neutron beam of the PF1B facility of the Institut Laue-Langevin, Grenoble. The measurement of γ radiation following fission was performed using the EXILL array of Ge detectors. The observed level scheme was compared with results of large valence space shell model calculations. The medium-spin level scheme consists of three bandlike structures, which can be understood as bands built on the π f 5/2 , π (p 3/2 + f 5/2 ), and π g 9/2 configurations. The behavior of the observed π g 9/2 band at high spins shows a considerable deviation from the shell model predictions. This deviation in this band is probably the result of an increased collectivity, which can be understood assuming that the π g 9/2 highj proton polarizes the core.

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Penning-trap-assisted study of excitations in Br88 populated in β decay of Se88

Cited by 7 publications

References 26 publications

Excited states in Br87 populated in β decay of Se87

Excited states in Br87 populated in β decay of Se87

Recent experiments at the JYFLTRAP Penning trap

Medium-spin states of the neutron-rich nucleus Br87

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