An update of the B(E2) evaluation for transitions in even–even nuclei near

Pritychenko, B.; Choquette, J.; Horoi, Mihai; Karamy, Babak; Singh, Balraj

doi:10.1016/j.adt.2012.06.004

Cited by 77 publications

(129 citation statements)

References 76 publications

Supporting

Mentioning

100

Contrasting

Order By: Relevance

“…Experiment [24] (gray circles with error bars, connected by solid line) is compared to calculations with several interactions. Black squares (solid line) show results produced by the KB3G interaction, red squares (dashed line) by the full collective interaction H coll , and purple squares (dotted line) by H coll without the quadrupolequadrupole part.…”

Section: Fig 1 (Color Online) B(e2) Values For Transitions From Thementioning

confidence: 99%

Testing the importance of collective correlations in neutrinolessββdecay

et al. 2016

View full text Add to dashboard Cite

We investigate the extent to which theories of collective motion can capture the physics that determines the nuclear matrix elements governing neutrinoless double-beta decay. To that end we calculate the matrix elements for a series of isotopes in the full pf shell, omitting no spin-orbit partners. With the inclusion of isoscalar pairing, a separable collective Hamiltonian that is derived from the shell model effective interaction reproduces the full shell-model matrix elements with good accuracy. A version of the generator coordinate method that includes the isoscalar pairing amplitude as a coordinate also reproduces the shell model results well, an encouraging result for theories of collective motion, which can include more single-particle orbitals than the shell model. We briefly examine heavier nuclei relevant for experimental double-beta decay searches, in which shell-model calculations with all spin-orbit partners are not feasible; our estimates suggest that isoscalar pairing also plays a significant role in these nuclei, though one we are less able to quantify precisely.

show abstract

Section: Fig 1 (Color Online) B(e2) Values For Transitions From Thementioning

confidence: 99%

Testing the importance of collective correlations in neutrinolessββdecay

et al. 2016

View full text Add to dashboard Cite

show abstract

“…This behavior suggests a rapid development of collectivity in the heavier neutron-rich Fe isotopes where the 68 Ni region. Data were taken from [11], except for 64 Cr and 66,68 Fe values from [10] and 58,60,62 Cr values from [12]. νg 9/2 orbit plays an important role (see for example Ref.…”

Section: Introductionmentioning

confidence: 99%

β−decay of65Mn to65Fe

et al. 2013

View full text Add to dashboard Cite

The low-energy structure of 65 Fe has been studied by means of γ and fast-timing spectroscopy at the ISOLDE facility, CERN. A level scheme of 65 Fe populated following the β − decay of 65 Mn was established for the first time. It includes 41 levels and 85 transitions. The excitation energy of the β-decaying isomer in 65 Fe has been precisely determined at 393.7(2) keV. The β-delayed neutron emission branch was measured as P n = 7.9(12)%, which cannot be reconciled with the previously reported value of 21.0(5)%. Four γ rays and four excited states in 64 Fe were identified as being populated following the β-n decay. Four lifetimes and five lifetime limits in the subnanosecond range have been measured using the advanced time-delayed βγ γ (t) method. The level scheme is compared with shell-model calculations. Tentative spin and parity assignments are proposed based on the observed transition rates, the calculations, and the systematics of the region.

show abstract

“…[7] are shown together with available experimental data down to N ¼ 32 in Fig. 2, including the present results [26][27][28].…”

mentioning

confidence: 99%

“…With the effective mass q m ¼ 1:77 (the sum of the proton and neutron effective charges) and normalizing the calculated Q 0 's to A ¼ 64 to remove the A 5=3 dependence of Q, within the framework of the shell-model calculations we obtain intrinsic mass quadrupole moments of 273, 318, 313, and 300 fm 2 for 60-66 Cr, and 214, 243, Pritychenko et al [27] LNPS [7] Pritychenko et al [27] [7] Pritychenko et al [27] Warburton et al [26] Ljungvall et al [13] Rother et al [14] Present work LNPS (DZ) [7] Pritychenko et al [27] Warburton et al [26] Ljungvall et al [13] Rother et al [14] Present work LNPS (DZ) [7] …”

mentioning

confidence: 99%

Quadrupole Collectivity in Neutron-Rich Fe and Cr Isotopes

Crawford¹,

Clark²,

Fallon³

et al. 2013

Phys. Rev. Lett.

View full text Add to dashboard Cite

Intermediate-energy Coulomb excitation measurements are performed on the N ! 40 neutron-rich nuclei 66;68 Fe and 64 Cr. The reduced transition matrix elements providing a direct measure of the quadrupole collectivity BðE2; 2 þ 1 ! 0 þ 1 Þ are determined for the first time in 68 Fe 42 and 64 Cr 40 and confirm a previous recoil distance method lifetime measurement in 66 Fe 40 . The results are compared to state-ofthe-art large-scale shell-model calculations within the full fpgd neutron orbital model space using the Lenzi-Nowacki-Poves-Sieja effective interaction and confirm the results of the calculations that show these nuclei are well deformed. DOI: 10.1103/PhysRevLett.110.242701 PACS numbers: 25.70.De, 27.50.+e For many decades the nuclear shell structure originally proposed by Mayer [1] and Jensen and coworkers [2], where energy gaps are predicted at specific nucleon numbers, was a paradigm of nuclear physics, as it was consistent with the experimental findings at or near the valley of beta stability. However, with the possibility of producing more exotic nuclei, the traditional magic numbers have been observed to be weakened or to disappear while new subshell gaps have emerged. In particular, the role of the proton-neutron tensor interaction has been recognized as driving changes in the shell structure [3]. Alterations to the effective single-particle orbital gaps can lead to enhanced particle-hole excitations, which are supported by deformation and pairing effects, and may give rise to new regions of well-developed nuclear deformation.A region of recent interest is that of the neutron-rich isotopes near N ¼ 40, below the 28 Ni isotopes. In many ways structurally similar to the ''island of inversion '' nuclei near N ¼ 20 [4], the Fe and Cr isotopes in this region have been experimentally observed to exhibit increasingly collective behavior, rather than the near-magic behavior naively expected assuming a robust N ¼ 40 subshell gap. In a schematic way, the development of collectivity moving from 28 Ni to 26 Fe and 24 Cr is understood as a result of a narrowing of the N ¼ 40 subshell closure and the enhancement of quadrupole collectivity through promotion of neutron pairs across the subshell gap. With the removal of protons from the 1f 7=2 orbital, the attractive tensor and central parts of the p-n interaction between 1f 7=2 proton holes and neutrons in the 1g 9=2 and 2d 5=2 orbits pull these neutron single-particle levels down in energy. At the same time, the repulsive tensor ð1f 7=2 Þ À1 À 1f 5=2 interaction dominates over the central attractive p-n interaction and drives the neutron 1f 5=2 orbital up, effectively quenching the N ¼ 40 gap. Looking at it another way, adding 12 neutrons to 48 Ca produces a gapless 60 Ca; as protons are added in the 1f 7=2 orbit, the repulsive interaction between the 1f 7=2 protons and the 1g 9=2 and 2d 5=2 neutrons and the strongly attractive 1f 7=2 -1f 5=2 interaction opens the N ¼ 40 gap up to its value in 68 Ni. The disappearance of the N ¼ 40 gap towards 60 Ca supports ...

show abstract

An update of the B(E2) evaluation for transitions in even–even nuclei near

Cited by 77 publications

References 76 publications

Testing the importance of collective correlations in neutrinolessββdecay

Testing the importance of collective correlations in neutrinolessββdecay

β−decay of65Mn to65Fe

Quadrupole Collectivity in Neutron-Rich Fe and Cr Isotopes

Contact Info

Product

Resources

About