Search for Low-spin Negative Parity States in⁹⁷Mo and⁹⁹Mo

Abstract

By means of in-beam gamma-ray and conversion electron spectroscopy spin and parity has been assigned to states of 97,99Mo observed in the 96Mo(d,pγ)97Mo and 98Mo(d,pγ)99Mo reaction, respectively. The data indicate that no low-spin negative parity states are likely to exist below ∼ 1 Mev.

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

“…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.…”

“…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].…”

“…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.…”

Half-lives of levels in99Nb and99Mo

“…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.…”

Experimental study of the rearrangements of valence protons and neutrons amongst single-particle orbits during double- β decay in Mo100

“…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.…”