Absolute partial decay-branch measurements in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>13</mml:mn></mml:msup></mml:math>C

Wheldon, C.; Ashwood, N. I.; Barr, M.; Curtis, N.; Freer, M.; Kokalova, Tzany; Malcolm, J. D.; Ziman, V.; Wirth, H.‐F.; Hertenberger, R.; Lutter, R.

doi:10.1103/physrevc.86.044328

Cited by 19 publications

(14 citation statements)

References 29 publications

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“…In the present work, the band is extended up to J π = (8 − ). Wheldon et al [9] also reported levels at 710.2(15) keV and 953.3 (20) keV, but they were not placed in the K π = 4 − band, as proposed here. The previously known K π = (6 + ) state [8,14] is also confirmed in the present work, and the 217.6-keV γ ray is interpreted as the first in-band cascade transition.…”

Section: Eγsupporting

confidence: 43%

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In-beam γ -ray spectroscopy studies of medium-spin states in the odd-odd nucleus Re186

Matters¹,

Kondev²,

Aoi³

et al. 2017

Phys. Rev. C

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Excited states in 186 Re with spins up to J = 12 were investigated in two separate experiments using 186 W(d,2n) reactions at beam energies of 12.5 MeV and 14.5 MeV. Two-and threefold γ-ray coincidence data were collected using the CAESAR and CAGRA spectrometers, respectively, each composed of Compton-suppressed HPGe detectors. Analysis of the data revealed rotational bands built on several two-quasiparticle intrinsic states, including a long-lived K π = (8 +) isomer. Configuration assignments were supported by an analysis of in-band properties, such as |gK − gR| values. The excitation energies of the observed intrinsic states were compared with results from multiquasiparticle blocking calculations, based on the Lipkin-Nogami pairing approach, that included contributions from the residual proton-neutron interactions.

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Section: Eγsupporting

confidence: 43%

“…[7]. Wheldon et al [9], using the (p,d) reaction and a highresolution magnetic spectrograph, observed a number of two-quasiparticle excited states in 186 Re. However, because of a lack of angular distribution data, the spin, parity, and configuration assignments were based on model calculations rather than on experimental data.…”

Section: Introductionmentioning

confidence: 99%

In-beam γ -ray spectroscopy studies of medium-spin states in the odd-odd nucleus Re186

Matters¹,

Kondev²,

Aoi³

et al. 2017

Phys. Rev. C

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“…Among the carbon isotopes, 13 C is of particular importance as the system composed of three α particles (bosons) plus a valence nucleon (fermion). The Hoyle analog state in 13 C, the BEC of three α particles with a neutron as an impurity, and the possible formation of the linear-chain structure assisted by a valence neutron have been main interests for this nucleus [29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Shape of C13 studied by the real-time evolution method

2021

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Background: Recently, Bijker et al. [Phys. Rev. Lett. 122, 162501 (2019)] explained the rotation-vibration spectrum of 13 C by assuming a triangular nuclear shape with D 3h symmetry. Purpose: The purpose of this work is to test the shape and symmetry of 13 C based on a microscopic nuclear model without assumption of nuclear shape. Method: We have applied the real-time evolution method to 13 C. By using the equation-of-motion of clusters, the model describes the 3α + n system without any assumption of symmetry. Results: REM described the low-lying states more accurately than the previous cluster model studies. The analysis of the wave functions showed that the ground band has approximate triangular symmetry, while the excited bands deviate from it. Conclusion: This work confirmed that the ground band has the intrinsic structure with the triangular arrangement of three α particles.

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“…In addition to the experimental C0 matrix elements, the IS monopole transition rates of 13 C for the lowest three excited 1/2 − states have been reported with the inelastic α scattering on the target of 13 C by Kawabata et al [37], and their experimental values are comparable to the single particle one [8]. In the light of the fact that the monopole strengths are one of the good physical quantities to explore cluster states in light nuclei as mentioned above, those experimental results suggest that the low-lying excited 1/2 − states have an aspect of α-clustering in 13 C. Candidates for the molecular states with K π = 3/2 ± [69][70][71] and linear-chain configurations of three α clusters in 13 C [69, [72][73][74] have been proposed in highly excited energy region above the 3α + n threshold. However, the cluster structures of the low-lying states including the 1/2 ± ones up to around the 3α + n threshold have not been studied well, although some preliminary results have been reported [38,69,75].…”

Section: Introductionmentioning

confidence: 78%

Alpha Cluster Structures and Isoscalar Monopole Excitations in Light Nuclei

Yamada¹

2014

J. Phys.: Conf. Ser.

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The structure of 1/2 ± states in 13 C up to around the 3α + n threshold (E x = 12.3 MeV) is investigated with a full four-body 3α + n orthogonality condition model (OCM) calculation, where the 3α OCM, the model space of which is the subspace of the 3α + n model, describes well the structure of the low-lying states of 12 C including the 2 + 2 , 0 + 3 , and 0 + 4 states, which have been recently observed above the Hoyle state (0 + 2 ). A full spectrum up to the 1/2 − 5 (1/2 + 3 ) state is reproduced consistently with the lowest five 1/2 − (three 1/2 + ) states of experimental spectrum. It is shown that the 1/2 − 2 and 1/2 − 3 states are characterized by the dominant cluster configurations of 9 Be(3/2 − ,1/2 − )+α, while the ground state 1/2 − 1 has a shell-model-like structure. The observed monopole transition strengths to the 1/2 − 2,3 states are consistently reproduced for the first time.These results indicate that the excited 1/2 − states have cluster structures. They are compared to those by the previous work with the shell model. On the other hand, the 1/2 + 1 state is found to have a loosely bound neutron structure in which the extra neutron moves around 12 C(g.s) core with 1S orbit, reflecting the fact that this state appears by 1.9 MeV just below the 12 C(g.s)+n threshold, while the 1/2 + 2 and 1/2 + 3 states are characterized by 9 Be+α structures. We found that the 1/2 + 5 state located above the 3α + n threshold is the Hoyle analogue state in 13 C, the wave function of which is described by product states of constituent clusters, (0S) 3 α (S) n , with the probability of 52 %. PACS numbers: 21.10.Dr, 21.10.Gv, 21.60.Gx, 03.75.Hh Cluster as well as mean field pictures are important to understand the structure of light nuclei [1-4]. A lot of cluster states are known to exist in light nuclei [3] as well as neutron rich nuclei [5, 6] and hypernuclei [7]. The typical cluster state is the Hoyle state, the second 0 + state (0 + 2 ) at E x = 7.65 MeV in 12 C. This state is located just above the 3α disintegrated threshold, and is characterized by the large monopole transition rate sharing about 16 % of the energy-weighted sum rule [8]. The microscopic and semi-microscopic cluster models in 1970's [9-11] demonstrated that the Hoyle state has a loosely coupled 3α cluster structure. In 2000's, however, it was found that the Hoyle state has a remarkable aspect of the α-particle condensate structure, described as a dominant product state of α particles, all occupying an identical 0S orbit with 70 % probability [12-19]. This has aroused a great interest in nuclear cluster physics, and brought significant developments in experimental studies, in particular, for the excited states of the Hoyle states. Recent experimental efforts [20-25] eventually confirmed the second 2 + state (2 + 2 ) of 12 C, which had been predicted at a few MeV above the Hoyle state by the microscopic cluster models in 1970's. A new observation of the 4 + state at 13.3 MeV was reported in Ref. [26]. In addition, two broad 0 + states, 0 + 3 and 0 + 4 ...

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Absolute partial decay-branch measurements in13C

Cited by 19 publications

References 29 publications

In-beam γ -ray spectroscopy studies of medium-spin states in the odd-odd nucleus Re186

In-beam γ -ray spectroscopy studies of medium-spin states in the odd-odd nucleus Re186

Shape of C13 studied by the real-time evolution method

Alpha Cluster Structures and Isoscalar Monopole Excitations in Light Nuclei

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