Relationship between the intensity of running exercise on a treadmill and the changes in the concentrations of beta-endorphin + beta-lipotropin (beta-E + beta-LPH) and adrenocorticotropic hormone ...(ACTH) in plasma were studied in 10 experienced male endurance athletes. At random order, the subjects run on a treadmill six exercises which required on an average (mean +/- S.E.) 50 +/- 0.8%, 58 +/- 0.8%, 69 +/- 1.1%, 80 +/- 0.7%, 92 +/- 1.0% and 98 +/- 0.5% of their maximal oxygen consumption. Plasma levels of beta-E + beta-LPH and ACTH did not show any significant changes during the 50-80%-tests. During the 92% test, the mean levels (+/- S.E.) of beta-E + beta-LPH and ACTH increased significantly (p less than 0.001), from 3.0 +/- 0.4 to 8.0 +/- 1.2 pmol/l and from 3.1 +/- 0.5 to 8.9 +/- 1.3 pmol/l, respectively, and during the 98% test, from 3.7 +/- 0.6 pmol/l to 20.4 +/- 1.5 pmol/l, and from 3.6 +/- 0.6 to 21.8 +/- 1.5 pmol/l, respectively. Increases in the plasma levels of beta-E + beta-LPH and ACTH were always accompanied by an increase in the blood lactate level. We conclude that intensive running with an anaerobic response causes an increase in the concentrations of beta-endorphin and ACTH in plasma in endurance athletes, whereas slight aerobic exercise did not elicit any response.
The quenching of the experimental spectroscopic factor for proton emission from the short-lived \(d_{3/2}\) isomeric state in \(^{151m}\)Lu was a long-standing problem. In the present work, proton ...emission from this isomer has been reinvestigated in an experiment at the Accelerator Laboratory of the University of Jyv\"{a}skyl\"{a}. The proton-decay energy and half-life of this isomer were measured to be 1295(5) keV and 15.4(8) \(\mu\)s, respectively, in agreement with another recent study. These new experimental data can resolve the discrepancy in the spectroscopic factor calculated using the spherical WKB approximation. Using the R-matrix approach it is found that the proton formation probability indicates no significant hindrance for the proton decay of \(^{151m}\)Lu.
The lifetime of the first excited 2(+) state in the neutron deficient nuclide (108)Te has been measured for the first time, using a combined recoil decay tagging and recoil distance Doppler shift ...technique. The deduced reduced transition probability is B(E2;0(g.s.)(+) -> 2(+)) = 0.39(-0.04)(+0.05)e(2)b(2). Compared to previous experimental data on neutron deficient tellurium isotopes, the new data point constitutes a large step (six neutrons) toward the N = 50 shell closure. In contrast to what has earlier been reported for the light tin isotopes, our result for tellurium does not show any enhanced transition probability with respect to the theoretical predictions and the tellurium systematics including the new data is successfully reproduced by state-of-the-art shell model calculations.
Full text
Available for:
CMK, CTK, FMFMET, IJS, NUK, PNG, UM
495.
Bandcrossings in 171Os Bark, R.A.; Törmänen, S.; Bäck, T. ...
Nuclear physics. A,
2/1999, Volume:
646, Issue:
4
Journal Article
Peer reviewed
The nucleus
171Os has been populated using the reaction
116Sn(
58Ni,2pn). Four new bands are identified, and the previously known bands are extended in spin, to a maximum of
53
2
h
̵
. One- and ...three-quasiparticle configurations are identified, and β, γ, and octupole configurations are assigned tentatively. The effects of a possible intruder configuration on the negative parity bands are tested using band-mixing calculations.
Full text
Available for:
IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, UL, UM, UPCLJ, UPUK
Decay paths, half-lives, and excitation energies of the i{sub 13/2} bandheads of the neutron-deficient nuclei {sup 171}Pt, {sup 167}Os, and {sup 163}W have been established for the first time. ...Gamma-ray transitions, X-rays, and internal conversion electrons have been observed, allowing internal-conversion coefficients to be measured and B(M2) reduced transition probabilities to be extracted. These results elucidate the low-lying single-quasiparticle structures and give the energy level spacings between the nuf{sub 7/2}, nuh{sub 9/2}, and nui{sub 13/2} quasineutron states for all three nuclei. Moreover, ground-state spin assignments have been made for the first time, along with the measurement of the {alpha}-decay branching ratio for {sup 171}Pt. The decay paths of the i{sub 13/2} bandheads were followed by favored {alpha} decays, indicating that all three nuclei have the same I{sup {pi}}=7/2{sup -} ground state.
Full text
Available for:
CMK, CTK, FMFMET, IJS, NUK, PNG, UM
Excited states in the neutron-deficient nuclide {sup 163}W were investigated using the {sup 106}Cd({sup 60}Ni,2pn){sup 163}W reaction at a beam energy of 270 MeV. The level scheme for {sup 163}W was ...extended significantly with the observation of five new band structures. The yrast band based on a 13/2{sup +} isomeric state is extended up to (57/2{sup +}). Two band structures were established on the 7/2{sup -} ground state. Quasiparticle configuration assignments for the new band structures were made on the basis of cranked Woods-Saxon shell-model calculations. The results reported in this article suggest that the negative-parity nu(f{sub 7/2},h{sub 9/2}) orbitals are responsible for the first rotational alignment in the yrast band.
Full text
Available for:
CMK, CTK, FMFMET, IJS, NUK, PNG, UM
Excited states of the nucleus Os-167 have been populated by the reaction Mo-92(Kr-78,2pn). The JUROGAM gamma-ray detector array has been used in conjunction with the RITU gas-filled separator and the ...GREAT spectrometer to observe prompt gamma rays in coincidence with recoiling fusion-evaporation residues and their subsequent decay by alpha particle emission. By correlating prompt gamma radiation with the characteristic alpha radioactivity of Os-167, it has been possible to extend the level scheme for this nucleus significantly. In particular, an extension of the yrast band and four previously unobserved bands are reported. In addition, the recoil distance Doppler-shift method was used to determine a lifetime of tau=20(4) ps for The I-pi=17/2(+) state in Os-167. Hence, the level of collectivity and magnitude of deformation of the low spin yrast band of this nucleus is established.
.
Full text
Available for:
CMK, CTK, FMFMET, IJS, NUK, PNG, UM
PDF