Search for Low-spin Negative Parity States in<sup>97</sup>Mo and<sup>99</sup>Mo

Dietrich, Wolfgang; Madueme, G.Ch.; Westerberg, L.; Bäcklin, A.

doi:10.1088/0031-8949/12/5/004

Cited by 13 publications

(5 citation statements)

References 21 publications

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“…The extracted half-life T 1/2 = 742(13) ns, shown in Fig. 1c), is in good agreement with previous measurements [15,17] leading to a more precise reduced transition probability B(M 2) = 0.104(3) W.u. value.…”

Section: Experimental Measurementssupporting

confidence: 90%

“…This second isomeric state will be noted in the following as 99m2 Mo. A spin and parity assignment was reported to be J π = 11/2 − [15,16], with an expected pure νh 11/2 configuration. The 99m2 Mo state has a weakly prolate shape and was identified as the head of the decoupled band associated with the population of the low-K components of the unique-parity νh 11/2 orbital [10,16].…”

Section: Introductionmentioning

confidence: 88%

“…In 99 Mo, a second microsecond isomeric level, located above the T 1/2 = 15.5 µs, J π = 5/2 + , E x = 97.785 keV one [14], at an excitation energy of E x = 684.10 keV was first observed by the work of Ref. [15]. This second isomeric state will be noted in the following as 99m2 Mo.…”

Section: Introductionmentioning

confidence: 98%

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Magnetic moment of the 11/2− isomeric state in Mo99 and neutron spin g

et al. 2021

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The gyromagnetic factor of the low-lying Ex = 684.10(19) keV isomeric state of the nucleus 99 Mo was measured using the Time Dependent Perturbed Angular Distribution technique. This level is assigned a spin and parity of J π = 11/2 − , with a half-life of T 1/2 = 742(13) ns. The state of interest was populated and spin-aligned via a single-neutron transfer on an highly enriched 98 Mo target. A magnetic moment µexp. = −0.627(20)µN was obtained. This result is far from the Schmidt value expected for a pure single-particle νh 11/2 state. A comparison of experimental spectroscopic properties of this nucleus is made with results of multi-shell Interacting Boson-Fermion Model (IBFM-1) calculations. In this approach, the J π = 11/2 − isomeric state in 99 Mo has a pure νh 11/2 configuration. Its magnetic moment, as well as that of other two excited states could be reasonably well reproduced by reducing the free neutron spin g factor with a quenching factor of 0.45. This low value is not appropriate only for this case, similar values for the quenching factor being also required in order to describe magnetic moments in other nuclei from the same mass region.

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Section: Experimental Measurementssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 88%

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Magnetic moment of the 11/2− isomeric state in Mo99 and neutron spin g

et al. 2021

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“…It has the multipolarity M1 [14] with an upper limit of 7% for an E2 admixture. Hence, the probability for M 1 fraction of the transition is T=(8.0+ 1.6) 108/s.…”

Section: M0mentioning

confidence: 99%

Half-lives of levels in99Nb and99Mo

et al. 1982

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The half-lives of the 469-keV level in 99Nb and the 236-keV state in 99Mo have been determined to (0.21 + 0.06) ns and (0.87__ 0.15) ns, respectively, from fl, 7-delayed coincidences. Values of B(E2)=(89_+28)e 2 fmr and B(M1)=(0.017 +0.003)gg are deduced for the 469-keV transition in 99Nb and the 138-keV transition in 99Mo. The result for the E2-transition probability seems to be in accordance with the particle-core coupling interpretation of the low-lying levels in 99Nb if 98Zr is used as the core. The M1 probability for 99M0 agrees with the systematics for "/-forbidden" lgv/2-+2ds/2 neutron transitions.

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“…There are several published studies of the (d, p) and (p, d) reactions on 100 Mo [22][23][24][25][26][27][28][29][30][31]. Studies of both these reactions, albeit fewer in number, have been made on targets of 98 Mo [27,[32][33][34] and 102 Ru [35][36][37][38][39]. Neutron addition has been performed on 100 Ru [40,41], although the neutron removal with the (p, d) reaction has not.…”

Section: Introductionmentioning

confidence: 99%