Experimental study of bound states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>12</mml:mn></mml:msup></mml:math>Be through low-energy<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>11</mml:mn></mml:msup></mml:math>Be<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>d</mml:mi><mml:mo>,</mml:mo><mml:mi>p</mml:mi><mml:mo>)</mml:mo></m

Johansen, Jacob; Bildstein, V.; Borge, María José García; Cubero, M.; Diriken, J.; Elseviers, J.; Fraile, L. M.; Fynbo, H. O. U.; Gaffney, L. P.; Gernhäuser, R.; Jonson, B.; Koldste, G. T.; Konki, J.; Kröll, T.; Krücken, R.; Mücher, D.; Nilsson, T.; Nowak, K.; Pakarinen, J.; Pesudo, V.; Raabe, R.; Riisager, K.; Seidlitz, M.; Tengblad, O.; Törnqvist, H.; Voulot, D.; Warr, N.; Wenander, F.; Wimmer, K.; Witte, H. De

doi:10.1103/physrevc.88.044619

Cited by 28 publications

(21 citation statements)

References 63 publications

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“…Nothing is known about possible 0 − and 2 − states, whose unnatural parity would have caused them to be very weak in the 10 Be(t,p) reaction. They were also not observed in two different investigations [12,13] of the 11 Be(d,p) reaction (in reverse kinematics), even though the 0 − spectroscopic factor is predicted [12] to be reasonably large. The possibility that the 0 − might be an isomer [14] depends on its energy relative to the neutron breakup threshold at 3.171 MeV [15].…”

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confidence: 71%

Lowest negative-parity states inBe12

Fortune

2014

Phys. Rev. C

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A very simple model is applied to the first four negative-parity states of 12 Be. Energies of the corresponding four states in 14 C are used to validate the model and to determine the doublet splitting parameters. Predictions for 12 Be are in remarkable agreement with excitation energies of the known 1 − at 2.70 MeV and the suspected (3 − ) at 4.56 MeV. Predicted excitation energies of 0 − and 2 − are 3.59 and 5.12 MeV, respectively.Introduction. In 12 Be, adding 2s 1/2 and 1d 5/2 neutrons to the first-excited state of 11 Be at 0.320 MeV [1] produces four negative-parity states, with J = 0 to 3. Of these, only the 1 − state at E x = 2.702 MeV [2] has been definitely identified. A candidate for the 3 − state is at 4.56 MeV. This state was initially suggested as 2 + [3], but it now appears likely [4,5] to be (3 − ) or a (3 − /2 + ) doublet. Millener [4] noted the excellent agreement between the 1.86 MeV energy difference between the 1 − and the probable (3 − ) in 12 Be and the 1/2 + -5/2 + splitting of 1.78 MeV in 11 Be. Comparison of heavy-ion-induced reactions leading to 12 Be [6,7] and 14 C [8] (where the 3 − is known) significantly strengthens the 3 − suggestion for the 4.56-MeV state. The suggestion [9] that the (3 − ) state might instead be 0 + has been addressed recently [10,11]. Nothing is known about possible 0 − and 2 − states, whose unnatural parity would have caused them to be very weak in the 10 Be(t,p) reaction. They were also not observed in two different investigations [12,13] of the 11 Be(d,p) reaction (in reverse kinematics), even though the 0 − spectroscopic factor is predicted [12] to be reasonably large. The possibility that the 0 − might be an isomer [14] depends on its energy relative to the neutron breakup threshold at 3.171 MeV [15].Various calculations have predicted the energy of the 0 − state. 16] produced a 0 − excitation energy of about 2.5 to 2.8 MeV. They had adjusted their potential to reproduce the ground state (g.s.) energy. They then found that they missed the energies of the second 0 + and first 2 + states by 0.84 and 0.92 MeV, respectively, which they fixed by adjusting a three-body force. They found they needed no three-body force for the 1 − state and hence used none for 0 − . Kanada-En'yo and Horiuchi [17] had predicted the 0 − to be very unbound, with E x ß 8-9 MeV, but they had the first 1 − above 5 MeV, and it is known at 2.7 MeV. Blanchon et al.[18] obtained an excitation energy of 2.91 MeV. Garrido et al. [9] have it at about 3.19 MeV. Kanungo et al.[12] calculated a 0 − energy at 5.59-5.91, but their energy of the 1 − state was 3.38-3.71 MeV. These predictions are summarized in Table I. A no-core shell-model calculation [19] considered only the first few states of 12 Be and thus provided no prediction for 0 − . Descouvement and Baye [20] calculated only natural-parity states and therefore had no 0 − prediction.In 14 C, four states with J π = 0 − to 3 − are known [21] and can be thought of as s and d neutrons coupled to the 1/2 − ground state (g.s.) of 13 C. Our aim h...

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confidence: 71%

Lowest negative-parity states inBe12

Fortune

2014

Phys. Rev. C

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“…To extract the SFs, theoretical calculations were performed by using the code FRESCO [36], which incorporates approaches such as the distorted wave Born approximation (DWBA) or the finite-range adiabatic distorted wave approximation (FR-ADWA). Due to the uncertainties in DWBA calculation associated with the applied optical potentials (OPs) [2,26,37], we adopt the FR-ADWA method, which uses nucleonic potentials, includes explicitly the deuteron breakup process and can provide consistent results for (d, p) transfer reactions [2]. In the present work the p + n potential is given by the Reid soft-core interaction [38].…”

Section: Resultsmentioning

confidence: 99%

“…This experiment was later on questioned for the possible contamination of the (CD 2 ) n target and the large uncertainties in extracting SFs from the undistinguishable 0 + 2 and 2 + states [22]. Another one-neutron transfer experiment at 2.8A MeV was then performed with a clear separation of all low-lying excited states by incorporating the γ-ray detection [26]. The extracted SFs (set III) are 0.15 +0.03 −0.05 and 0.40 +0.…”

Section: Introductionmentioning

confidence: 99%

A new measurement of the intruder configuration in 12Be

Chen

Lou

et al. 2018

Physics Letters B

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A new 11 Be(d, p) 12 Be transfer reaction experiment was carried out in inverse kinematics at 26.9A MeV, with special efforts devoted to the determination of the deuteron target thickness and of the required optical potentials from the present elastic scattering data. In addition a direct measurement of the cross section for the 0 + 2 state was realized by applying an isomer-tagging technique. The s-wave spectroscopic factors of 0.20 +0.03 −0.04 and 0.41 +0.11 −0.11 were extracted for the 0 + 1 and 0 + 2 states, respectively, in 12 Be. Using the ratio of these spectroscopic factors, together with the previously reported results for the p-wave components, the single-particle component intensities in the bound 0 + states of 12 Be were deduced, allowing a direct comparison with the theoretical predictions. It is evidenced that the ground-state configuration of 12 Be is dominated by the d-wave intruder, exhibiting a dramatic evolution of the intruding mechanism from 11 Be to 12 Be, with a persistence of the N = 8 magic number broken.

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“…The detection efficiency for the γ lines from the 152 Eu source, corrected for emission probabilities using [18], is then scaled, using the 302-and 356-keV points from 133 Ba and placing the 344-keV point from 152 Eu on a straight line between these. The absolute γ efficiency above 600 keV was then found by fitting the 152 Eu points to a relative efficiency curve determined in a slightly different detector configuration [19] (that used four different γ sources:…”

Section: The Experimentsmentioning

confidence: 99%

Multiparticle emission in the decay ofAr31

et al. 2014

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A multihit capacity setup was used to study the decay of the dripline nucleus 31 Ar, produced at the ISOLDE facility at CERN. A spectroscopic analysis of the β-delayed three-proton decay of 31 Ar is presented for the first time together with a quantitative analysis of the β-delayed 2pγ decay. A new method for determination of the spin of low-lying levels in the βp daughter 30 S using proton-proton angular correlations is presented and used to determine that the spin of the 5.2-MeV level is most likely 3 + with 4 + also possible. The half-life of 31 Ar is found to be 15.1 (3) ms. An improved analysis of the Fermi β strength including the β3p-decay mode gives a total measured branching ratio of 3.60(44)%, which is lower than the theoretical value found to be 4.24(43)%. Finally, a previously unidentified γ transition from the isobaric analog state in the decay of 33 Ar has been found.

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Experimental study of bound states in12Be through low-energy11Be(d,p)

Cited by 28 publications

References 63 publications

Lowest negative-parity states inBe12

Lowest negative-parity states inBe12

A new measurement of the intruder configuration in 12Be

Multiparticle emission in the decay ofAr31

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