Systematics of absolute transition probabilities of K-Forbidden gamma-ray transitions

Löbner, K. E. G.

doi:10.1016/0370-2693(68)90614-x

Cited by 164 publications

(110 citation statements)

References 6 publications

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“…As discussed in Ref. [23], we attribute this to K hindrance [44], the well-known mechanism by which nuclear half-lives are prolonged in axially well-deformed nuclei. In this particular case of a 124-keV…”

Section: B 82 41 Nb 41mentioning

confidence: 66%

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Isomeric states in neutron-deficientA~80–90nuclei populated in the fragmentation ofAg107
Garnsworthy¹,
Regan²,
Piétri³
et al. 2009
Phys. Rev. C
31
1
6
1
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The relativistic projectile fragmentation of a 750 MeV per nucleon beam of 107 Ag was used to populate isomeric states in neutron-deficient nuclei around A = 80-90. Reaction products were separated and unambiguously identified using the GSI FRagment Separator (FRS) and its ancillary detectors. At the final focal plane, the fragments were slowed from relativistic energies by means of an aluminium degrader and implanted in a passive stopper in the center of the high-efficiency, high-granularity Stopped Rare Isotope Spectroscopic INvestigation at GSI (RISING) germanium array. This allowed the identification of excited states in the N = Z nuclei 86 43 Tc and, for the first time, 82 41 Nb. Isomeric states have also been identified for the first time in 87,88 Tc, and a previously unreported isomer was observed in 84 Nb. Experimental results are presented along with a discussion on the structure of these nuclei based on interpretations provided by several theoretical models.

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Section: B 82 41 Nb 41mentioning

confidence: 66%

“…87 43 Tc 44 Two γ rays, likely to form a deformed band built on a proton g 9/2 state, have been observed in this nucleus previously [51] but no linking transitions to the ground state were identified. The nuclei were produced in fusion-evaporation reactions and studied using prompt spectroscopy.…”

Section: 43 Tc 43mentioning

confidence: 90%

Isomeric states in neutron-deficientA~80–90nuclei populated in the fragmentation ofAg107
Garnsworthy¹,
Regan²,
Piétri³
et al. 2009
Phys. Rev. C
31
1
6
1
View full text Add to dashboard Cite

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“…In particular, detailed spectroscopy of these bands in the region where they cross and interact allows the extraction of a matrix element for the interaction, and, as discussed in Section IV, this has important implications for testing the role of Coriolis mixing in the decay of high-K states to the g and s bands. transitions were of M2 character, unprecedentedly low hindrance factors would be implied (e.g., F≤1 for the 397 keV transition depopulating band 5, compared to 10 6 -10 10 for a typical M2 transition with ν=6 [2]). The negative parity tentatively assigned to band 3 (and consequently, to its signature partner, band 4) is based on systematics.…”

Section: K=0 and Intermediate-k Statesmentioning

confidence: 99%

High-Kisomers inW176and mechanisms ofKviolation

et al. 1996

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An isomer, with t 1/2 =35 ± 10 ns and J, K π = 14, 14 + , has been observed in the nucleus 176 W using the reaction 150 Nd( 30 Si,4n) at a beam energy of 133 MeV. The isomer exhibits an unusual pattern of decay in which the majority of the flux proceeds directly to states with =0, bypassing available levels of intermediate K. This severe breakdown of normal K-selection rules in 176 W is compared with recent observations of K-violation in neighboring nuclei, within the framework of proposed theoretical approaches. The available data on these K-violating decays seem to have a consistent explanation in models of K-mixing which include large-amplitude fluctuations of the nuclear shape.

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“…In Refs. [37,38], it was found that f ν ≈ 100 for a range of ν and l, so that for each additional unit of K, transitions are hindered by an additional factor of about 100. This situation is well illustrated [39] by the decay of high-K isomers in 178 Hf, which is arguably located at the center of the K-isomer region [2].…”

Section: K-forbidden Transitionsmentioning

confidence: 99%

High-Kstates in the odd-odd nuclideRe180

et al. 2005

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The structure of the deformed, doubly odd nuclide 180 Re has been studied by γ -ray and conversion-electron spectroscopy using the 174 Yb( 11 B,5n) reaction with a pulsed 71 MeV beam of 11 B ions. Several of the previously known intrinsic states have been given revised spin and parity assignments. Rotational bands are observed with K π = (4 + ), (5 − ), (7 + ), 8 + , 9 − , 13 + , 14 − , 15 − , 16 + , 21 − , and (22 + ). Among these, a four-quasiparticle t band is identified, which is already energetically favored at its bandhead compared to the corresponding two-quasiparticle band; and two six-quasiparticle bands are identified and associated with a τ = 13 µs isomer. The observed structures, including g factors and alignments, are interpreted with the aid of Nilsson-plus-BCS calculations and configuration-constrained potential energy surface calculations. Reduced-hindrance values are obtained for K-forbidden transitions, illustrating the important role of the K quantum number for near-yrast isomers.

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Systematics of absolute transition probabilities of K-Forbidden gamma-ray transitions

Cited by 164 publications

References 6 publications

Isomeric states in neutron-deficientA~80–90nuclei populated in the fragmentation ofAg107
Garnsworthy¹,
Regan²,
Piétri³
et al. 2009
Phys. Rev. C
31
1
6
1
View full text Add to dashboard Cite

Isomeric states in neutron-deficientA~80–90nuclei populated in the fragmentation ofAg107
Garnsworthy¹,
Regan²,
Piétri³
et al. 2009
Phys. Rev. C
31
1
6
1
View full text Add to dashboard Cite

High-Kisomers inW176and mechanisms ofKviolation

High-Kstates in the odd-odd nuclideRe180

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Systematics of absolute transition probabilities of K-Forbidden gamma-ray transitions

Cited by 164 publications

References 6 publications

Isomeric states in neutron-deficientA~80–90nuclei populated in the fragmentation ofAg107Garnsworthy1, Regan2, Piétri3 et al. 2009Phys. Rev. C31161View full textAdd to dashboardCite

Isomeric states in neutron-deficientA~80–90nuclei populated in the fragmentation ofAg107Garnsworthy1, Regan2, Piétri3 et al. 2009Phys. Rev. C31161View full textAdd to dashboardCite

High-Kisomers inW176and mechanisms ofKviolation

High-Kstates in the odd-odd nuclideRe180

Contact Info

Product

Resources

About

Isomeric states in neutron-deficientA~80–90nuclei populated in the fragmentation ofAg107
Garnsworthy¹,
Regan²,
Piétri³
et al. 2009
Phys. Rev. C
31
1
6
1
View full text Add to dashboard Cite

Isomeric states in neutron-deficientA~80–90nuclei populated in the fragmentation ofAg107
Garnsworthy¹,
Regan²,
Piétri³
et al. 2009
Phys. Rev. C
31
1
6
1
View full text Add to dashboard Cite