Transition strengths and deformation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Kr</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>77</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Johnson, Tanya; Holcomb, J. W.; Womble, P. C.; Cottle, P. D.; Tabor, S. L.; Durham, F. E.; Buccino, S.G.; Matsuzaki, Masayuki

doi:10.1103/physrevc.42.2418

Cited by 20 publications

(16 citation statements)

References 32 publications

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“…The same trends appear in the neighboring isotopes Kr [19] and srKr [4], although the a = -2 bands are not known in the second crossing region.…”

Section: -supporting

confidence: 65%

“…A strong alternation was seen [2) in the B(M1) values for the yrast positive-parity band in~9 Kr for the low-spin states whose energies exhibit large signature splitting. However, above the 1qp -3qp band crossing in the region of vanishing signature split- Kr [4], Kr, and Kr [19,21,22]. Harris parameters Js -- 11 positive-parity states in Zr [14 -17], Sr [3,11], Kr, and Kr [19,21,22].…”

Section: -mentioning

confidence: 99%

“…However, above the 1qp -3qp band crossing in the region of vanishing signature split- Kr [4], Kr, and Kr [19,21,22]. Harris parameters Js -- 11 positive-parity states in Zr [14 -17], Sr [3,11], Kr, and Kr [19,21,22]. Harris parameters Jo = 11 5 /MeV and Jq = 0 5 /MeV were used for the reference rotor.…”

Section: -mentioning

confidence: 99%

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Shape changes inKr79

Döring

et al. 1994

Phys. Rev. C

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High-spin states in Kr were studied using the Cu( O,p3n) reaction at 65 MeV at the Florida State University Tandem-LINAC facility. Prompt p-p coincidences were observed using the Pitt-FSU detector array. Twelve new states were found, along with 19 new transitions. The yrast positive-and negative-parity bands were extended up to spins of (45/2+) and (31/2 ), respectively. Spin assignments were made based on directional correlation of oriented nuclei ratios whenever possible. A cranked-shell-model analysis shows some indication for a second band crossing in the positive-parity band at hu 0.75 MeV. This crossing, probably due to an aligned g9/Q neutron pair, occurs with a much larger band interaction than the Srst y9gq proton crossing. An increase in signature splitting above ho 0.75 MeV and a return of large alternations in the B(M1)/B(E2) ratio is consistent with the theoretically predicted return to a nearly oblate shape.PACS number(s): 23.20.Lv, 27.50.+e, 29.30.Kv

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“…The same trends appear in the neighboring isotopes Kr [19] and srKr [4], although the a = -2 bands are not known in the second crossing region.…”

Section: -supporting

confidence: 65%

Section: -mentioning

confidence: 99%

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Shape changes inKr79

Döring

et al. 1994

Phys. Rev. C

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“…Among other odd-odd nuclei, they have been reported for 7 Br [1] and can be inferred from intensity tables in papers on 7sBr [2] and 7sRb [26]. In 1-qp bands they have been observed in the N = 41 isotones TsSe [5] and 77Kr [27,28] and interpreted in terms of triaxiality in the particle-rotor model [6]. There have also been two recent observations of alternating M1 strengths at high excitation in even-even s4Sr [29] and Zr [30], where the effect has been attributed to a doublet structure in the interacting boson approximation.…”

Section: B Cranking Model Analysismentioning

confidence: 84%

Nuclear structure of odd-oddY82

et al. 1993

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Excited states in Y have been investigated via the Ni( Si, 3pn) Y and Fe( Si,p2n) Y reactions using beams provided by the Florida State University Tandem-LINAC with energies of 95 to 135 MeV. Particle-p coincidences with a full-sphere charged-particle detector and an excitation curve were used to assign p rays to Y. The Fe( Si,p2n) Y reaction at 95 MeV was used to measure p-p coincidences with five Compton-suppressed Ge detectors, Lifetimes in the ns and ps ranges were measured using direct timing and the Doppler-shift attenuation method. A level scheme with 39 states was constructed up to tentative spins and parities of (15 ) and (21+). In the positive-parity yrast band a phase reversal was observed in the signature splitting at I = 105. The B(M1) strengths in this band alternate with signature between about 0.1 and 1.0 p~. The B(E2) strengths of about 90 Weisskopf units are in good agreement with those predicted by Hartree-Fock-Bogolyubov calculations. Particle-rotor calculations indicate a prolate or triaxial core shape for the positive-parity band. PACS number(s):

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“…The huge staggering of radii in the light Hg region was explained by coexisting weak oblate and strong prolate deformation minima whose relative depth depends on the presence of an unpaired neutron [20]. Experimentally, the rigid-rotor-like behaviour of the odd-A neutron deficient 77 Sr, 79 Sr and 75 Kr, 77 Kr is established through the studies of their high spin states [24][25][26][27][28][29][30]. The same conclusion can be drawn from the nuclear moments measured by laser spectroscopy [8,10,11].…”

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confidence: 99%

On the odd-even staggering of mean-square charge radii in the light krypton and strontium region

et al. 1996

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Recently isotope shifts of 72, Kr and 77-100 Sr have been measured at the ISOLDE/ CERN mass separator facility by collinear laser spectroscopy. The deduced changes in mean square charge radii reveal sharp transitions in nuclear shape from spherical near the magic neutron number N=50 towards strongly deformed for both the neutron deficient and neutron rich isotopes far from stability. The mean square charge radii of the neutron deficient isotopes exhibit a sign change of the odd-even staggering (OES), i.e. below the neutron number N=46 the radius is systematically larger for the odd-N nuclei than for their even-N neighbours. This is in contrast to the situation of normal OES which is observed for the heavier isotopes. The inversion of the OES is interpreted as an effect of polarization, triggered by the addition of an unpaired neutron and driving the soft eveneven core into stable strong deformation. accepted for publication in Europhysics Letters (IS80 and IS304)

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Transition strengths and deformation inKr77

Cited by 20 publications

References 32 publications

Shape changes inKr79

Shape changes inKr79

Nuclear structure of odd-oddY82

On the odd-even staggering of mean-square charge radii in the light krypton and strontium region

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