The isobaric multiplet mass equation for revisited

Lam, Y. H.; Blank, Β.; Смирнова, Н. А.; Bueb, J. B.; Antony, M. S.

doi:10.1016/j.adt.2012.11.002

Cited by 55 publications

(52 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Measurements of neutron-deficient 58 Ni projectile fragments yielded new masses for 41 Ti, 43 V, 45 Cr, 47 Mn, 49 Fe, 51 Co, 53 Ni, and 55 Cu T z = −3/2 nuclei [30,35,36]. These new masses enabled us 5 ■■■ 010019-5 JPS Conf.…”

Section: The Mass Of 53 Ni and The Test Of The Isobaric Multiplet Masmentioning

confidence: 99%

See 1 more Smart Citation

Precision Mass Measurements of Short-Lived Nuclides at the Heavy-Ion Storage Ring in Lanzhou

Zhang

Litvinov

2015

Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014)

View full text Add to dashboard Cite

Recent commissioning of the Cooler Storage Ring at the Heavy Ion Research Facility in Lanzhou enabled us to conduct high-precision mass measurements at the Institute of Modern Physics in Lanzhou (IMP). In the past few years, mass measurements were performed using the CSRe-based isochronous mass spectrometry employing the fragmentation of the energetic beams of 58 Ni, 78 Kr, 86 Kr, and 112 Sn projectiles. Masses of short-lived nuclides of on both sides of the stability valley were addressed. Relative mass precision of down to 10 −6 − 10 −7 is routinely achieved. The mass values were used as an input for dedicated nuclear structure and astrophysics studies, providing for instance new insights into the rp-process of nucleosynthesis in X-ray bursts. In this contribution, we briefly review the so far conducted experiments and the main achieved results, as well as outline the plans for future experiments.

show abstract

Section: The Mass Of 53 Ni and The Test Of The Isobaric Multiplet Masmentioning

confidence: 99%

“…Prior to our measurements, there have been extensive tests in the sd-shell nuclei (see Ref. [51] and references therein). However, no significant deviations were found except for slight disagreements at A =8, 9, 32, and 33.…”

Section: The Mass Of 53 Ni and The Test Of The Isobaric Multiplet Masmentioning

confidence: 99%

Precision Mass Measurements of Short-Lived Nuclides at the Heavy-Ion Storage Ring in Lanzhou

Zhang

Litvinov

2015

Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014)

View full text Add to dashboard Cite

show abstract

“…A 1977 experimental measurement of the 36 Ar( 3 He, 8 Li) 31 Cl Q-value resulted in a mass excess value of ∆ = −7070 ± 50 keV [20]. Subsequent evalutions of the IMME [6][7][8]21] 31 Si [27][28][29]), the 50-keV uncertainty in the 31 Cl mass excess has hindered attempts to test the IMME stringently in the lowest quartet. A recent Penning trap mass measurement of 31 Cl finally obtained a value for the ground state mass excess 15 times more precise than previous estimates [30], leading to an IMME breakdown in the lowest quartet; the IMME fit required an unusually large cubic term, with d = −3.5(11) keV.…”

Section: Introductionmentioning

confidence: 99%

“…As discussed in Refs. [6] and [7], in situations where the fit of the quadratic form is very poor, a cubic or quartic form with extra terms dT 3 z or eT 4 z may be required. Typically, these terms have been determined empirically to be either very small, 1 keV, or consistent with zero.…”

Section: Introductionmentioning

confidence: 99%

Isobaric multiplet mass equation in theA=31,T=3/2quartets

Bennett¹,

Wrede²,

Brown³

et al. 2016

Phys. Rev. C

View full text Add to dashboard Cite

Background: The observed mass excesses of analog nuclear states with the same mass number A and isospin T can be used to test the isobaric multiplet mass equation (IMME), which has, in most cases, been validated to a high degree of precision. A recent measurement (Kankainen et al., Phys. Rev. C 93 041304(R) (2016)) of the ground-state mass of 31 Cl led to a substantial breakdown of the IMME for the lowest A = 31, T = 3/2 quartet. The second-lowest A = 31, T = 3/2 quartet is not complete, due to uncertainties associated with the identity of the 31 S member state.Purpose: To populate the two lowest T = 3/2 states in 31 S and use the data to investigate the influence of isospin mixing on tests of the IMME in the two lowest A = 31, T = 3/2 quartets.Methods: Using a fast 31 Cl beam implanted into a plastic scintillator and a high-purity Ge γ-ray detection array, γ rays from the 31 Cl(βγ) 31 S sequence were measured. Shell-model calculations using USDB and the recently-developed USDE interactions were performed for comparison.Results: Isospin mixing between the 31 S isobaric analog state (IAS) at 6279.0(6) keV and a nearby state at 6390.2(7) keV was observed. The second T = 3/2 state in 31 S was observed at Ex = 7050.0(8) keV. Calculations using both USDB and USDE predict a triplet of isospin-mixed states, including the lowest T = 3/2 state in 31 P, mirroring the observed mixing in 31 S, and two isospin-mixed triplets including the second-lowest T = 3/2 states in both 31 S and 31 P.Conclusions: Isospin mixing in 31 S does not by itself explain the IMME breakdown in the lowest quartet, but it likely points to similar isospin mixing in the mirror nucleus 31 P, which would result in a perturbation of the 31 P IAS energy. USDB and USDE calculations both predict candidate 31 P states responsible for the mixing in the energy region slightly above Ex = 6400 keV. The second quartet has been completed thanks to the identification of the second 31 S T = 3/2 state, and the IMME is validated in this quartet.

show abstract

“…This quadratic form of IMME turns out to work remarkably well for almost all isobaric multiplets where data exist [15][16][17]. Hence it becomes a powerful tool to predict unknown masses, particularly those of very neutron-deficient nuclei important for the astrophysical rp-process [18].…”

mentioning

confidence: 99%

Generalized isobaric multiplet mass equation and its application to the Nolen-Schiffer anomaly

Zhang

Zuo

et al. 2018

Phys. Rev. C

View full text Add to dashboard Cite

The Wigner Isobaric Multiplet Mass Equation (IMME) is the most fundamental prediction in nuclear physics with the concept of isospin. However, it was deduced based on the Wigner-Eckart theorem with the assumption that all charge-violating interactions can be written as tensors of rank two. In the present work, the chargesymmetry breaking (CSB) and charge-independent breaking (CIB) components of the nucleon-nucleon force, which contribute to the effective interaction in nuclear medium, are established in the framework of Brueckner theory with AV18 and AV14 bare interactions. Because such charge-violating components can no longer be expressed as an irreducible tensor due to density dependence, its matrix element cannot be analytically reduced by the Wigner-Eckart theorem. With an alternative approach, we derive a generalized IMME (GIMME) that modifies the coefficients of the original IMME. As the first application of GIMME, we study the long-standing question for the origin of the Nolen-Schiffer anomaly found in the Coulomb displacement energy of mirror nuclei. We find that the naturally-emerged CSB term in GIMME is largely responsible for explaining the Nolen-Schiffer anomaly. Introduction. The similarity of proton and neutron masses and approximate symmetry of nucleon-nucleon interactions under the exchange of the two kinds of nucleons lead to the concept of isospin [1,2]. At the isospin-symmetry limit, the charge-symmetry requires that the free proton-proton interaction v pp excluding the Coulomb force is equal to the neutronneutron v nn , while the charge-independence requires that the neutron-proton interaction v np = (v nn + v pp )/2 [3]. However, the nucleon-nucleon scattering data suggested that v nn is slightly more attractive than v pp , and v np is stronger than (v nn + v pp )/2 [4,5]. In real nuclear systems where manybody effects are important [6], isospin symmetry breaking has long been an active research theme connected to different subfields, for examples, in understanding the precise values of the Cabbibo-Kobayashi-Maskawa (CKM) mixing matrix elements between the u and d quarks [7,8], the changes in nuclear structure near the N = Z line due to charge-violating nuclear force [9][10][11][12], and the influence in nova nucleosynthesis [13].

show abstract

The isobaric multiplet mass equation for revisited

Cited by 55 publications

References 17 publications

Precision Mass Measurements of Short-Lived Nuclides at the Heavy-Ion Storage Ring in Lanzhou

Precision Mass Measurements of Short-Lived Nuclides at the Heavy-Ion Storage Ring in Lanzhou

Isobaric multiplet mass equation in theA=31,T=3/2quartets

Generalized isobaric multiplet mass equation and its application to the Nolen-Schiffer anomaly

Contact Info

Product

Resources

About