Nuclear structure studies of high-spin states in 79Rb and 79Kr

Panqueva, J.; Hellmeister, H.P.; Lühmann, L.; Bergmeister, F.J.; Lieb, K. P.; Otsuka, T.

doi:10.1016/0375-9474(82)90527-9

Cited by 55 publications

(25 citation statements)

References 22 publications

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“…for N<42, the 1 qp bands continue to be yrast and have nearly constant moments of inertia as seen in 81y and 79Rb [3,6]. At smaller deformation, i.e.…”

Section: Introductionmentioning

confidence: 81%

“…We thus find a slight, systematic increase of /~z for increasing proton number. Extensive model calculations for the g9/2 band in the Rb iostopes [5][6][7][8] Fig. 9.…”

Section: R =-B (E 2 R +J--+ R --2 +J)/b (E 2 R ~ R --2)mentioning

confidence: 99%

“…This prominent structure emerges because at large prolate deformation the unpaired proton can occupy Nilsson orbits with low projection numbers f2 onto the axis of largest elongation. Such onequasiparticle bands have been found in sly [3] and 85y [4] as well as in the odd rubidium isotopes 77'79'81'83Rb [5][6][7][8]. In the Br and Rb isotopes bands of this type have given clear evidence for triaxial deformation [2, %7].…”

Section: Introductionmentioning

confidence: 97%

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Structure of high spin states in83Y

Lister

Varley

Fieber

et al. 1988

Z. Physik A - Atomic Nuclei

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We report on the first in-beam study of high spin levels in 83y which were established up to 9.0 MeV excitation energy and probable spin of 41/2 + resp. 27/2-by means of the reaction 58Ni(28Si, 3p). Ten lifetimes and six lifetime limits in the 10 -lz-10-9s range were determined in two recoil distance Doppler shift experiments. The positive parity yrast states form a g9/2 Coriolis decoupled band with partial alignment, near-rigid rotor moment of inertia and deformation//2 =0.29. The negative parity yrast band has very similar collective properties; it shows a pronounced band crossing at rotational frequency hco~0.40 MeV which we associate with twoquasiparticle g9/2 proton alignment. At 2.56 MeV excitation, a second AI=I band starting with 17/2-was found. On the basis of the similarity to 85y and the very weak E2 decay of this state, we suggest that this band has (3qp) configuration with an aligned g9/2 neutron pair. The lifetimes of the lowest 2 + and 4 + state in S~Zr populated in the reaction SSNi (2sSi, 2p) were determined to be z(2)= 17.8(11) ps resp. z(4)= 3.5(4) ps.

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“…for N<42, the 1 qp bands continue to be yrast and have nearly constant moments of inertia as seen in 81y and 79Rb [3,6]. At smaller deformation, i.e.…”

Section: Introductionmentioning

confidence: 81%

“…We thus find a slight, systematic increase of /~z for increasing proton number. Extensive model calculations for the g9/2 band in the Rb iostopes [5][6][7][8] Fig. 9.…”

Section: R =-B (E 2 R +J--+ R --2 +J)/b (E 2 R ~ R --2)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Structure of high spin states in83Y

Lister

Varley

Fieber

et al. 1988

Z. Physik A - Atomic Nuclei

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“…(5) while Fu~ r is obtained from eq. (5) by interchanging the indices lr and v. Other, more complex forms, could be used, if needed.…”

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confidence: 99%

“…The corresponding computer program was originally written by Otsuka and Yoshida [4], and applied to the study of 79Rb and 79Kr in ref. [5]. The calculations presented in this article are based on an improved version of this program obtained by one of us (R.B.…”

mentioning

confidence: 99%

A calculation of low-lying collective states in odd-even nuclei

et al. 1984

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We present results of a calculation of properties of low-lying collective quadrupole states in odd-even nuclei within the framework of the proton-neutron interacting boson-fermion model.The importance of proton-neutron degrees of freedom in low-lying collective states of nuclei has been emphasized in recent years by the interacting boson model [ 1 ]. In addition to introducing specific proton -neutron effects, such as the occurrence ofK P = 1 + bands in deformed nuclei [2], this model has the advantage that, being closely related to the microscopic shell model, it allows one to make extrapolations and predictions for properties of nuclei hitherto unknown. The next logical step in the direction of a detailed understanding of nuclear properties is that of performing similar proton-neutron calculations for odd-even nuclei. Because of the large number of low-lying states, these calculations present a major challenge. Previous calculations of odd-even nuclei within the framework of the interacting boson model have been done with the version of the model in which no distinction is made between proton and neutron degrees of freedom [3]. In this letter, we present the results of the first systematic calculations performed using the protonneutron interacting boson-fermion model. The corresponding computer program was originally written by Otsuka and Yoshida [4], and applied to the study of 79Rb and 79Kr in ref. [5]. The calculations presented in this article are based on an improved version of this program obtained by one of us (R.B.), together with B. Visscher [6]. The improvement consists of a prediagonalization and truncation of the boson spectrum before coupling the odd fermion.In the interacting boson-fermion model, spectra of odd-even nuclei are calculated by coupling the collective degrees of freedom, described by bosons, to the single-particle degrees of freedom (fermions). The hamiltonian is written aswhere H (B) is the proton-neutron interacting boson hamiltonian [ 1 ], H (F) is the hamiltonian describing the single-particles degrees of freedom, and V(BF) is their interaction. The structure of the boson-fermion interaction is, in general, rather complex since the bosons are composite rather than fundamental particles and thus one needs to take into account the effects of the Pauli principle. A purely phenomenological treatment of this interaction is not possible, since it contains a large number of parameters. One must therefore rely on a microscopic derivation. Several of these have been given [7][8][9][10]. In the calculations pre-141

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Nuclear Rotation in the N≅Z≅36 Region

Lieb

1986

Weak and Electromagnetic Interactions in Nuclei

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Nuclear structure studies of high-spin states in 79Rb and 79Kr

Cited by 55 publications

References 22 publications

Structure of high spin states in83Y

Structure of high spin states in83Y

A calculation of low-lying collective states in odd-even nuclei

Nuclear Rotation in the N≅Z≅36 Region

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