First spectroscopy of 66Se and 65As: Investigating shape coexistence beyond the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mi>Z</mml:mi></mml:math> line

Obertelli, A.; Baugher, T.; Bazin, D.; Boissinot, S.; Delaroche, J.-P.; Dijon, A.; Flavigny, F.; Gade, A.; Girod, M.; Glasmacher, T.; Grinyer, G. F.; Körten, W.; Ljungvall, J.; McDaniel, S.; Ratkiewicz, A.; Sulignano, B.; Isacker, P. Van; Weißhaar, D.

doi:10.1016/j.physletb.2011.06.032

Cited by 23 publications

(12 citation statements)

References 37 publications

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“…The calculation shown in Fig. 2(b) reproduces the TED data [19,21] remarkably well. We thus conclude that the INC interaction enhances the MED and TED significantly, and is responsible for the isospin symmetry breaking in the upper f p shell.…”

supporting

confidence: 62%

“…Unfortunately, for mirror and triplet nuclei with A > 66, there are no experimental data on MED and TED available due to experimental difficulties with the T = 1, T z = −1 nuclei. Very recently, new observation of low-lying levels in 66 Se has been reported [19,20], which, with the data of 66 As [21] and 66 Ge [22], gives the experimental A = 66 MED and TED up to J = 6. This is by now the heaviest triplet nuclei having the TED data.…”

mentioning

confidence: 81%

“…To summarize, the recent experimental results [19,20] motivated us to carry out a detailed shell-model analysis for MED and TED in the upper f p shell region, aiming at a better understanding of isospin-symmetry breaking in nuclear effective interactions. We have systematically investigated MED and TED for the T = 1, T z = 0, ±1 nuclei with A = 66 − 78 by performing large-scale shell-model calculations.…”

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confidence: 99%

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Isospin nonconserving interaction in theT=1analogue states of the mass-70 region

et al. 2014

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Mirror energy differences (MED) and triplet energy differences (TED) in the T = 1 analogue states are important probes of isospin-symmetry breaking. Inspired by the recent spectroscopic data of 66 Se, we investigate these quantities for A = 66 − 78 nuclei with large-scale shell-model calculations. For the first time, we find clear evidences suggesting that the isospin nonconserving (INC) nuclear force has a significant effect for the upper f p shell region. Detailed analysis shows that in addition to the INC force, the electromagnetic spin-orbit interaction plays an important role for the large, negative MED in A = 66 and 70 and the multipole Coulomb term contributes to the negative TED in all the T = 1 triplet nuclei. The INC force and its strength needed to reproduce the experimental data are compared with those from the G-matrix calculation using the modern charge-dependent nucleon-nucleon forces.PACS numbers: 21.10. Sf, 21.30.Fe, 21.60.Cs, 27.50.+e The impact of the Wigner's elegant concept, the isospin symmetry [1], is maximal near the N = Z line where nuclei have equal numbers of neutrons and protons. Breaking of this symmetry is generally attributed to the Coulomb and isospinnonconserving (INC) nuclear forces. To study the isospinsymmetry breaking, information for nuclei with N < Z is of particular interest but these nuclei are not easy to access experimentally. By comparison of nuclear masses [2] and detailed spectroscopic information [3] for nuclei having same isospin, T , one can study the isospin-related phenomena to explore the origin of the symmetry breaking.Measurable quantities have been suggested to probe the isospin-symmetry breaking. Mirror energy differences (MED), which are the differences between excitation energies of the T = 1 isobaric analogue states (IAS), are regarded as measures of the charge-symmetry breaking. On the other hand, triplet energy differences (TED) among the triplet T = 1 nuclei are used to indicate the charge-independence breaking. MED were extensively studied for the f 7/2 -shell nuclei up to high spins (see Ref.[4] for review). TED were discussed for the A = 46 [5,6], A = 50 [7], and A = 54 [8, 9] triplet nuclei. These studies have suggested that the INC nuclear interaction in the f 7/2 shell plays an important role in the explanation for the observed MED and TED [4,10]. In the upper sd shell, however, studies showed [11] that important contributions to the symmetry breaking come from the multipole Coulomb term and the electromagnetic spin-orbit interaction, but not from the INC nuclear interaction. Little has been explored for the upper f p-shell above the N = Z = 28 shell closure, and our knowledge on the isospin-symmetry breaking in the mass-70 region is presently very limited.Recent advances in experiment have made it possible to collect very exotic spectroscopic data. In the past few years, experimental information on mirror nuclei of the upper f p-shell above the doubly-magic nucleus 56 Ni became available. The MED in the A ∼ 60 mass region were discussed [12,...

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supporting

confidence: 62%

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confidence: 81%

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confidence: 99%

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Isospin nonconserving interaction in theT=1analogue states of the mass-70 region

et al. 2014

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“…However, only has a single level been observed at E x = 187(3) keV [24] for 65 As; whereas one level has been confirmed at E x = 929 keV, and two other levels were tentatively assigned at 2064 keV (4 + ) and 3520 keV (6 + ) for 66 Se [24,25]. We obtained other levels up to Gamow energy window, spectroscopic factors and γ widths with the large-scale shell model using NuShellX@MSU [26].…”

Section: The Formalismmentioning

confidence: 97%

New thermonuclear reaction rates of⁶⁴Ge(p,γ)⁶⁵As and⁶⁵As(p,γ)⁶⁶Se for type-I x-ray bursts

Lam

Parikh

et al. 2016

EPJ Web of Conferences

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Abstract. We present a new set of 64 Ge(p, γ) 65 As and 65 As(p, γ) 66 Se reaction rates based on recently evaluated proton separation energies S p ( 65 As) and S p ( 66 Se), and nuclear structure data from large-scale shell model calculations. Our new 64Ge(p,g) rate differs from those available in REACLIB by up to two orders of magnitude at temperatures encountered within type I X-ray bursts. We used one-zone post-processing type-I x-ray burst model to test our new rates, and present the astrophysical impact of these rates.

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“…Such difference does not change our conclusion in this contribution. In fact, there are not many available experimental level schemes for 65 As [41] and 66 Se [41,42], we had supplemented those missing but important experimental data with theoretical ones, e.g. energy levels, spectroscopic factors, and gamma widths using large-scale shell model calculations, without truncation, with the aid from the shell-model code NuShellX@MSU [43].…”

Section: Pos(inpc2016)144mentioning

confidence: 99%

New Reaction Rates Of 64Ge(p,γ)65As(p,γ)66Se And The Impact On Type I X-ray Bursts

Lam

Schatz

et al. 2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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The nucleosynthesis occurring in type-I X-ray bursts (XRBs) and the respective energy released in these thermonuclear explosions are sensitive to nuclear masses and reaction rates around the 64 Ge waiting point. Based on the recently measured masses of 64 Ge and 65 As, the deduced proton separation energies S p ( 65 As) and S p ( 66 Se), and nuclear structure information from large-scale shell model calculations, we have obtained new reaction rates of 64 Ge(p, γ) 65 As and 65 As(p, γ) 66 Se with reliable uncertainties. Our new thermonuclear reaction rate of 64 Ge(p, γ) 65 As differs from those available in REACLIB by up to two orders of magnitude at temperature range associated with type-I X-ray bursts. We evaluated the impact of these new rates, particularly the energy generation and the burst light curve, with self-consistent one-zone model [Schatz et al. Phys. Rev. Lett. 86 (2001) 3471]. Also, we identified the nuclear physics uncertainties determining the role of the 64 Ge to be a waiting point in XRBs, and strongly affecting XRB model predictions of the synthesis of 64 Zn and the synthesis of nuclei A ≥ 64.

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First spectroscopy of 66Se and 65As: Investigating shape coexistence beyond the N=Z line

Cited by 23 publications

References 37 publications

Isospin nonconserving interaction in theT=1analogue states of the mass-70 region

Isospin nonconserving interaction in theT=1analogue states of the mass-70 region

New thermonuclear reaction rates of⁶⁴Ge(p,γ)⁶⁵As and⁶⁵As(p,γ)⁶⁶Se for type-I x-ray bursts

New Reaction Rates Of 64Ge(p,γ)65As(p,γ)66Se And The Impact On Type I X-ray Bursts

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First spectroscopy of 66Se and 65As: Investigating shape coexistence beyond the N=Z line

Cited by 23 publications

References 37 publications

Isospin nonconserving interaction in theT=1analogue states of the mass-70 region

Isospin nonconserving interaction in theT=1analogue states of the mass-70 region

New thermonuclear reaction rates of64Ge(p,γ)65As and65As(p,γ)66Se for type-I x-ray bursts

New Reaction Rates Of 64Ge(p,γ)65As(p,γ)66Se And The Impact On Type I X-ray Bursts

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New thermonuclear reaction rates of⁶⁴Ge(p,γ)⁶⁵As and⁶⁵As(p,γ)⁶⁶Se for type-I x-ray bursts