New effective interaction for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>f</mml:mi><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="italic">pg</mml:mi><mml:mrow><mml:mn>9</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>-shell nuclei

Honma, Michio; Otsuka, T.; Mizusaki, T.; Hjorth‐Jensen, M.

doi:10.1103/physrevc.80.064323

Cited by 429 publications

(535 citation statements)

References 97 publications

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“…For f p shell nuclei, we used KB3G effective interaction [29]. In the case of f 5/2 pg 9/2 model space for Ni, Cu and Zn isotopes, we performed calculations with JUN45 effective interaction [30]. While NuShellX is a set of shell model computer codes written by Bill Rae [31], NuShellX@MSU is a set of wrapper codes written by Alex Brown.…”

Section: Hamiltonian and Quenching Factormentioning

confidence: 99%

“…The single-particle energies for KB3G effective interaction are taken to be -8.6000, -6.6000, -4.6000 and -2.1000 MeV for the f 7/2 , p 3/2 , p 1/2 and f 5/2 orbits, respectively. The JUN45 effective interaction, which was recently developed by Honma [30], is a realistic interaction based on the Bonn-C potential fitting by 400 experimental binding and excitation energy data with mass numbers A = 63 -96. For the JUN45 interaction, the single-particle energies are taken to be -9.8280, -8.7087, -7.8388 and -6.2617 MeV for the p 3/2 , f 5/2 , p 1/2 and g 9/2 orbits, respectively.…”

Section: Hamiltonian and Quenching Factormentioning

confidence: 99%

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Nuclearβ⁻-decay half-lives for ${fp}$ and ${fpg}$ shell nuclei

Kumar

Srivastava

2016

J. Phys. G: Nucl. Part. Phys.

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Abstract. In the present work we calculate the allowed β − -decay half-lives of nuclei with Z = 20 − 30 and N ≤ 50 systematically under the framework of the nuclear shell model. A recent study shows that some nuclei in this region belong to the island of inversion. We perform calculation for f p shell nuclei using KB3G effective interaction. In the case of Ni, Cu, and Zn, we used JUN45 effective interaction. Theoretical results of Q values, half-lives, excitation energies, logf t values, and branching fractions are discussed and compared with the experimental data. In the Ni region, we also compared our calculated results with recent experimental data [Z. Y. Xu et al., Phys. Rev. Lett. 113, 032505, 2014]. Present results agree with the experimental data of half-lives in comparison to QRPA. Nuclear β − -decay half-lives for f p and f pg shell nuclei 2 IntroductionThe neutron density becomes very diffused and the single-particle spectrum shows the similarity of the harmonic-oscillator as we approach towards the neutron-drip line [1,2]. We can see this effect at N = 40 shell gap. Recently intruder configurations are found in the neutron rich nuclei around this shell gap [3,4,5,6,7]. Thus the nuclear structure study of these nuclei in this region is very important [8,9,10].Sorlin et al. Using RIBF facility at RIKEN, the half-lives of twenty neutron-rich nuclei with Z = 27 − 30 are reported in ref. [14]. In that work, sizable magicity was reported for both the proton number Z = 28 and the neutron number N = 50 in 78 Ni. A sudden shortening of half-lives of the nickel isotopes beyond N = 50 were observed in this work, although this effect is not found in the Cu-Ge-Ga chains. The half-lives results from LISE2000 spectrometer at GANIL for 71 Co and 73 Co are reported in ref.[15]. The half-lives of 77,78 Ni were measured for the first time by Hosmer et al. [16], at NSCL, MSU. Recently the beta decay half-lives of 38 very neutron-rich Kr to Tc isotopes are measured at RIKEN [17].Despite the progress in the experimental side, we need theoretical estimates for half-lives of neutron rich nuclei, especially those belonging to the island of inversion. These calculations are based on allowed GT-transitions. Many theoretical calculations from the quasiparticle random phase approximation (QRPA) based on the HartreeFock Bogoliubov theory [18] or other global models [19,20,21] are available in the literature. These calculations underestimate the correlation among nucleons which predict GT-strength at low-energies. Recently, shell model calculations for the β − -decays of Z = 9 − 13 nuclei are reported by Li and Ren [22]. The motivation of the present work is to study β − -decay properties of Z = 20 − 30 nuclei using the nuclear shell model. This paper is organized as follows. In section 2, we present the formulas for the calculation of β − decay half-lives. Shell model spaces, effective interactions and the quenching factors adopted in our calculations are reported in section 3. In section 4, we present theoretical results along w...

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Section: Hamiltonian and Quenching Factormentioning

confidence: 99%

Section: Hamiltonian and Quenching Factormentioning

confidence: 99%

Nuclearβ⁻-decay half-lives for ${fp}$ and ${fpg}$ shell nuclei

Kumar

Srivastava

2016

J. Phys. G: Nucl. Part. Phys.

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“…The calculated nuclear moments for the two lowest 2 + and 2 − levels, along with their energy, are summarized in Table III for jj44b and in Table IV and for quadrupole moments the effective charges e eff π = 1.5e and e eff ν = 1.1e are used for JUNE45 [21] and e eff π = 1.4e and e eff ν = 1.0e for jj44b [35]. For each level, the occupancy of the leading proton configuration is given.…”

mentioning

confidence: 99%

“…Effective shell-model interactions which include this effect have recently been developed in the fpg model space. Two of these interactions start from a 56 Ni core [21,22], while the most recent one also includes excitations of protons from the πf 7/2 orbit across Z = 28 [23]. The odd-odd Cu isotopes are an ideal testing ground for these models, as their properties are extremely sensitive to the proton-neutron interaction.…”

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confidence: 99%

Experimental determination of anIπ=2−ground state inCu72

et al. 2010

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This article reports on the ground-state spin and moments measured in 72,74 Cu using collinear laser spectroscopy at the CERN On-Line Isotope Mass Separator (ISOLDE) facility. From the measured hyperfine coefficients, the nuclear observables µ( 72 Cu) = −1.3472(10)µ N , µ( 74 Cu) = −1.068(3)µ N , Q( 72 Cu) = +8(2) efm 2 , Q( 74 Cu) = +26(3) efm 2 , I ( 72 Cu) = 2, and I ( 74 Cu) = 2 have been determined. Through a comparison of the measured magnetic moments with different models, the negative moment reveals a strong πf 5/2 ⊗ νg 9/2 component in the ground-state wave function. Consequently, a negative parity has been assigned to the ground states of 72,74 Cu. Large-scale shell-model calculations illustrate the strong sensitivity of the nuclear moments to configuration mixing and to the effective interaction employed. The neutron-rich nuclei surrounding the Z = 28 and N = 50 shell closures have received a great deal of experimental and theoretical attention in the last decade. This region presents a key proving ground for the latest shell-model interactions, since it offers an attractively simple structure of the excited states in terms of particle-particle or particle-hole couplings. A compelling question in this region is related to the rapid reduction in energy of the 5/2 − state as the νg 9/2 orbital is filled in the Cu isotopes [1,2]. Given that this state remains static at approximately 1 MeV as neutrons fill the fp shell, its abrupt change at N = 40 garnered a great deal of interest and motivated further experimental and theoretical attention [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A major step in understanding the evolution of nuclear structure in this region was the suggestion to include the monopole term from the tensor force interaction [18,19]. This work predicted a reduction in energy of the 5/2 − state and an inversion with the 3/2 − state in the mid-shell region, which was recently confirmed to occur at N = 46 in the odd-Cu isotopes [20]. Effective shell-model interactions which include this effect have recently been developed in the fpg model space. Two of these interactions start from a 56 Ni core [21,22], while the most recent one also includes excitations of protons from the πf 7/2 orbit across Z = 28 [23]. The odd-odd Cu isotopes are an ideal testing ground for these models, as their properties are extremely sensitive to the proton-neutron interaction.Recent beta-decay studies of 72 Ni [8] have tentatively assigned a spin I = 2 to the ground state (gs) of 72 Cu. Shell-model calculations, based on effective and realistic interactions, could not reproduce such gs spin [8], but placed the 2 − and 2 + states around 400 keV. A gs spin I = 2 is particularly interesting since the spins of 71,73 Cu now have been measured as I = 3/2, and their magnetic moments are compatible with a leading πp 3/2 configuration [20]. However, a [πp 3/2 ⊗ νg 3 9/2 , σ = 1] cannot couple to spin 2, so this configuration cannot be the leading term in the gs wave function of 72 Cu. Alternatively it could be...

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“…Especially for A 70 nuclei which are located in the lighter area of this mass region, low-lying excited states may be expected to be well-described by nucleons that occupy primarily the p and f shell-model orbitals. At higher excitation energies, however, these nuclei may be expected to show evidence for increasing occupation of the g 9/2 intruder orbital in the structure of the nuclear states [3].…”

Section: Introductionmentioning

confidence: 99%

Lifetime measurements of the yrast8+and9+states inAs70
Morse
¹
,
Iwasaki
²
,
Lemasson
³

et al. 2014
Phys. Rev. C
5
0
4
0
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The lifetimes of the yrast 8 + and 9 + states of 70 As have been measured via the γ-ray lineshape method following population by the 9 Be( 78 Rb, 70 As) reaction at 101.6 MeV/nucleon. The strength of the E1 8 + → 7 − transition is found to be B(E1) = 1.3(5) × 10 −5 e 2 fm 2 or 1.2(4) × 10 −5 Weisskopf units (W.u.) while the 9 + → 8 + M1 transition is found to have a strength of B(M 1) = 1.5(8) µ 2 N or 0.85(42) W.u. The implications for the structure of these states is discussed and found to be consistent with an assignment to a πg 9/2 νg 9/2 configuration.

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New effective interaction forf5pg9-shell nuclei

Cited by 429 publications

References 97 publications

Nuclearβ⁻-decay half-lives for ${fp}$ and ${fpg}$ shell nuclei

Nuclearβ⁻-decay half-lives for ${fp}$ and ${fpg}$ shell nuclei

Experimental determination of anIπ=2−ground state inCu72

Lifetime measurements of the yrast8+and9+states inAs70
Morse
¹
,
Iwasaki
²
,
Lemasson
³

et al. 2014
Phys. Rev. C
5
0
4
0
View full text Add to dashboard Cite

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New effective interaction forf5pg9-shell nuclei

Cited by 429 publications

References 97 publications

Nuclearβ−-decay half-lives for ${fp}$ and ${fpg}$ shell nuclei

Nuclearβ−-decay half-lives for ${fp}$ and ${fpg}$ shell nuclei

Experimental determination of anIπ=2−ground state inCu72

Lifetime measurements of the yrast8+and9+states inAs70Morse1, Iwasaki2, Lemasson3 et al. 2014Phys. Rev. C5040View full textAdd to dashboardCite

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Nuclearβ⁻-decay half-lives for ${fp}$ and ${fpg}$ shell nuclei

Nuclearβ⁻-decay half-lives for ${fp}$ and ${fpg}$ shell nuclei

Lifetime measurements of the yrast8+and9+states inAs70
Morse
¹
,
Iwasaki
²
,
Lemasson
³

et al. 2014
Phys. Rev. C
5
0
4
0
View full text Add to dashboard Cite