Coulomb excitation of 174Hf K-isomer. γ-ray spectroscopy with high-spin isomer beam

Morikawa, T.; Gono, Y.; Morita, Kosuke; Kishida, T.; Murakami, Takeshi; Ideguchi, E.; Kumagai, H.; Liu, G.H.; Ferragut, A.; Yoshida, Akihiro; Zhang, Y.H.; Oshima, M.; Sugawara, M.; Kusakari, H.; Ogawa, Masahiro; Nakajima, Mitsuo; Tsuchida, Hideo; Mitarai, S.; Odahara, A.; Kidera, M.; Shibata, Masataka; Kim, J.C.; Chae, Soryong; Hatsukawa, Y.; Ishihara, M.

doi:10.1016/0370-2693(95)00345-l

Cited by 17 publications

(9 citation statements)

References 8 publications

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“…This may be interpreted as being due to the Z = 16 shell closure, analogously to the N = 16 magic number. The behavior of B(E2) and E(2 + )-disagreement of the former and agreement of the latter with the shell model prediction by the USDB [81] effective interaction (dotted lines)-is similar to the case of the analog nucleus 28 Ne. Therefore, the appearance of the N (Z ) = 16 magic number in 28 Ne( 28 S) could be related to its transitional character, discussed in Sect.…”

Section: Appearance Of the New Magic Numbersupporting

confidence: 51%

“…Another way is to decelerate the beam to a lower energy. Nuclear spectroscopy experiments by multistep Coulomb excitation [28] and fusion reaction [29] are such cases. Deceleration was achieved by using a thick production target together with a thick degrader in the intermediate focus of RIPS.…”

Section: Attempts At Low-energy Reactionsmentioning

confidence: 99%

“…The B(E2 : 0 + → 2 + ) value for 28 Ne, a neighboring even-even nucleus of 30 Ne, was obtained by a Coulomb excitation study [74]. As shown in Fig.…”

Section: Nuclei Around the Island Of Inversion Following The 32mentioning

confidence: 99%

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Research with fast radioactive isotope beams at RIKEN

Motobayashi

Sakuraï

2012

Progress of Theoretical and Experimental Physics

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The RIKEN RI Beam Factory (RIBF) provides intense radioactive isotope (RI) beams with energies around 200 MeV/nucleon in a wide range of unstable nuclei. Part of the facility started routine operation in 1987 and, in 1990, RI beams from this part became available, with energies of a few tens of MeV/nucleon and the world's highest intensities at the time for many light exotic nuclei. To exploit the research opportunities available with such fast RI beams, various experimental devices have been constructed and several new methods have been developed. A number of modern aspects of nuclear structure, such as the neutron halo and the disappearance/appearance of magic numbers, have been investigated. Several attempts to approach astrophysical nuclear processes involving short-lived nuclei have been made. The present RIBF facility was completed in 2006. It far exceeds other existing facilities in the world in its RI beam production capability. A variety of research programs have been started, and several groundbreaking results have already been obtained.

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Section: Appearance Of the New Magic Numbersupporting

confidence: 51%

Section: Attempts At Low-energy Reactionsmentioning

confidence: 99%

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Research with fast radioactive isotope beams at RIKEN

Motobayashi

Sakuraï

2012

Progress of Theoretical and Experimental Physics

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“…This relation (SEF) is able to calculate the rotational and vibrational energies of the even-even nuclei. In even-even nuclei, a single octupole band with levels characterized by = 0 + 1 − 2 + 3 − 4 + , ... formed from the two bands, the GSB with = 0 + , 2+4 + , ..., and the negative-parity band (NPB) with = 1 − , 3 − , 5 − ... [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. This is an example of the odd-even staggering or Δ = 1 staggering, the latter term is due to the fact that each energy level with angular momentum is displaced relatively to its neighbors with angular momenta = ±1 [22].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Energy Levels and Electromagnetic Transitions for Yb–Pt Nuclei with N=108 Using IBM, IVBM, and BMM

Al-Jubbori

2017

Ukr. J. Phys.

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The interacting boson and vector boson models, as well as the Bohr-Mottelson one, are employed to describe the energy levels and electromagnetic transitions of the 178 Yb-186 Pt (= 108) nuclei. For the purpose of determining the evolution of the ground state, both ((+ 2)/) and EGOS ratios have been calculated as functions of the spin. Based on the interacting vector boson model and Bohr-Mottelson model, the negative-parity and GSB bands have been calculated, while the interacting boson model is only employed to calculate GSB, , and. The interacting boson model is also used to calculate the reduced transition probabilities (2). The obtained findings show a very well agreement with experimentally obtained results elsewhere. We also used the intrinsic coherent state to obtain the potential energy surfaces. These results indicate that these nuclei have a rotational property SU(3), while 186 Pt has property O(6).

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“…The possibility of using isomeric beams to perform in-beam reactions has long been considered as a potentially powerful method (see e.g. [14]) and there have been some pioneering experiments to perform, for example, Coulomb excitation [15] or fusion [16] reactions with radioactive beams in high-spin isomeric states. In this work, the high-spin study of 52 Co was performed using a new in-flight approach -namely a knockout reaction on an isomeric beam -a method that has the capability of creating nuclei further from stability, and at higher spins, than the isomer itself.…”

mentioning

confidence: 99%

Isospin Symmetry at High Spin Studied via Nucleon Knockout from Isomeric States

et al. 2016

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One-neutron knockout reactions have been performed on a beam of radioactive 53 Co in a high-spin isomeric state. The analysis is shown to yield highly-selective population of high-spin states in an exotic nucleus with a significant cross section, and hence represents a technique that is applicable to the planned new generation of fragmentation-based radioactive beam facilities. Additionally, the relative cross sections among the excited states can be predicted to a high level of accuracy when reliable shell-model input is available. The work has resulted in a new level scheme, up to the 11 + band-termination state, of the proton-rich nucleus 52 Co (Z = 27, N = 25). This has in turn enabled a study of mirror energy differences in the A = 52 odd-odd mirror nuclei, interpreted in terms of isospin-non-conserving (INC) forces in nuclei. The analysis demonstrates the importance of using a full set of J-dependent INC terms to explain the experimental observations.Isospin symmetry arises from the near identical nature of the strong nuclear interaction regardless of which nucleons are involved (e.g. [1]). Under this assumption, and in the absence of electromagnetic effects, the proton and neutron can be considered as two states of the same particle, the nucleon. Heisenberg [2] assigned an isospin quantum number, t = 1 2 for a nucleon, with projection t z = − 1 2 (+ 1 2 ) for the proton(neutron), respectively. For nuclei, therefore, we expect to find isobaric analogue states (IAS), of a given isospin T , in a set of nuclei with T z (= (N − Z)/2) = −T → +T which. In the absence of isospin-breaking terms (such as the electromagnetic interaction), these IAS would be identical and degenerate. In reality, any isospin-breaking interactions will lift this degeneracy, and hence the differences in behaviour between IAS yields direct information on these interactions. Given that the Coulomb interaction is well understood, this has the potential to shed light on how isospin-breaking effects of nuclear origin manifest in nuclei, which is the long-term goal of this study. Mirror energy differences (MED), defined as M ED α = E * α,T,Tz=−1 − E * α,T,Tz=+1 , where α denotes a state label and E * is excitation energy), can yield important information on two-body interactions of the form V pp − V nn that must be used in conjunction with the Coulomb interaction to provide a good theoretical description -see for example [3][4][5][6][7]. These studies have raised fundamental questions about the influence of isovector interactions in nuclear structure. In this Letter, we present a new high-spin study of the odd-odd nucleus 52 Co (Z = 27), the proton-rich member of the T = 1 mirror pair 52 Co/ 52 Mn, using a novel technique to access high-spin states in this exotic system.

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Coulomb excitation of 174Hf K-isomer. γ-ray spectroscopy with high-spin isomer beam

Cited by 17 publications

References 8 publications

Research with fast radioactive isotope beams at RIKEN

Research with fast radioactive isotope beams at RIKEN

Investigation of Energy Levels and Electromagnetic Transitions for Yb–Pt Nuclei with N=108 Using IBM, IVBM, and BMM

Isospin Symmetry at High Spin Studied via Nucleon Knockout from Isomeric States

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