No abstract available

[en] High-spin states in the odd-odd N=Z nucleus ⁵⁰₂₅Mn have been investigated. A sequence of states up to J^π=6⁺ has been assigned as the T=1 analogue of the yrast band in ⁵⁰₂₄Cr for the first time. The differences in energy between levels in these bands are interpreted in terms of rotational alignments and the effect they have on the Coulomb energy of the nucleus. Comparisons with shell model calculations show that the Coulomb energy difference between the T=1 analogue structures is an important indicator of the competition between isovector pairing modes in N=Z nuclei and their isobars.

[en] In an attempt to resolve the inconsistencies found among earlier measurements, we remeasured the half-life of ⁵⁰Mn, paying particular attention to possible count rate and contaminant effects, and obtained 283.10(14) ms. Although most previous accounts seem to lack adequate detail, we are nevertheless constrained to retain their values in an overall recommended half-life of 283.21(11) ms

No abstract available

[en] The half-lives of the Fermi superallowed β transitions of ³⁴Cl, ³⁸K/sub m/, ⁴²Sc, ⁴⁶V, and ⁵⁰Mn have been measured by multiscaling β rays detected in a plastic scintillator. The activities were produced in the reactions ³²S(t,n)³⁴Cl at E/subt/=3.0 MeV, ³⁵Cl(α,n)³⁸K/sub m/ at E/sub alpha/=8.0 MeV, ⁴²Ca(p,n)⁴²Sc at E/subp/=10 MeV, ⁴⁶Ti(p,n)⁴⁶V at E/subp/=10 MeV, and ⁵⁰Cr(p,n)⁵⁰Mn at E/subp/=10 MeV. Results for the half-lives (in msec) were as follows: ³⁴Cl, 1525.2 +- 1.1; ³⁸K/sub m/, 922.3 +- 1.1; ⁴²Sc, 680.98 +- 0.62; ⁴⁶V, 424.01 +- 0.47; and ⁵⁰Mn, 282.72 +- 0.26. Comparisons are made with previous measurements; the systematics of the superallowed Fermi β emitters are discussed. The value for the vector coupling constant g/sub beta//subV/subR/ including the ''inner'' radiative correction is deduced to be g/sub beta//subV/subR/= (1.41220 +- 0.00043) x 10^-49 erg cm³

No abstract available

[en] The analysis of new experimental data, rotor-plus-quasideuteron and shell model calculations for the odd-odd N = Z nuclei ⁴⁶V and ⁵⁰Mn is presented. Low-lying low-spin states exhibiting collective properties appropriate for the K = 0, K = 3, and K = 5 bands are identified. The strong isovector M1 transitions of quasideuteron origin in ⁴⁶V and ⁵⁰Mn are shown to be important indicators for collective features and perfectly fit into the systematics of M1 transitions in odd-odd N = Z nuclei. (author)

[en] MEMS thruster with blended propellant was fabricated and experimentally tested in order to improve specific impulse of micro scale monopropellant thruster and to improve stability of thrust to be better. 90 wt. % H₂O₂ blended with 25 O/F ratio ethanol was used as propellant of thruster and platinum on alumina support was used as catalyst for decomposition of propellant. Thruster was made by five layers of photosensitive glasses. Four layers were integrated by thermal bonding method and catalyst was directly inserted into chamber before UV bonding process for the last layer bonding. Results of experimental tests showed ethanol blended hydrogen peroxide had higher specific impulse than unblended hydrogen peroxide. Expected improvement of thrust stability due to the blended propellant was found only in the transient state of thrust. Also, unlike the thrust instability of vertical type thruster of previous research, improvement of thrust stability was found owe to horizontal type thruster pattern on glass, despite aspect ratio limitation of glass fabrication with wet etching process. During the experimental test, combustion phenomena of ethanol with decomposed hydrogen peroxide were observed through glass layer and it made fracture on structure of thruster

[en] Deformed configuration mixing shell model with isospin projection (DSMT) is applied to study the structure of collective T=0 and T=1 bands in the odd-odd N=Z nuclei ⁴⁶V and ⁵⁰Mn. The pf-shell KB3 interaction is employed in the calculations. The T=0 and T=1 bands in both the nuclei compare well with experiment including the E2 and M1 transition strengths. The DSMT predicted structures of the bands in these nuclei are similar to those in the rotor-plus-quasideuteron model

[en] The f-p shell nuclei, lying between the spherical magic gaps at Z=20 and Z=40, play a very important role in our understanding of nuclear structure. Forming a bridge between the most stable nuclei around ⁵⁸Ni and the heaviest nuclei around Z=92, these nuclei also play an important role in nucleosynthesis and astrophysics