Sn108studied with intermediate-energy Coulomb excitation

Abstract

The NEMO collaboration is looking to measure neutrinoless double beta decay. The search for the effective neutrino mass will approach a lower limit of 0.1 eV. The NEMO 3 detector is now operating in the Frejus Underground Laboratory. The fundamental design of the detector is reviewed and the performances detailed. Finally, a summary of the data collected in the first runs which involve energy and time calibration and study of the background are presented.

New sub-μs isomers in125,127,129Snand isomer systematics ofLozeva1, Simpson2, Grawe3 et al. 2008Phys. Rev. CSelf Cite

“…11(c)], where the optimum effective charge changes from 0.70e to 1.00e from 130 Sn to 124 Sn in the present calculations. It seems that the value of 0.85e best describes the experimental values [21].…”

“…The 19/2 + and 15/2 + wave functions comprise of the h ±4, 6 11/2 configuration with two 6 + and 8 + states with v = 2, 4 within 150 keV, which will undergo increased mixing by virtue of pn interaction and, depending on the relative sign of the valence and core-excited contribution, enable constructive or destructive interference of v = 2 contributions to the E2 matrix element. It should be noted that while the v = 0 strength disappears in mid-shell, the v = 2 transition strength peaks there (see, e.g., 2 + → 0 + transitions [15,21] (Fig. 2) for the g n 9/2 system).…”

“…A good description of the experimental data is found from using an effective neutron charge of e n = 0.70e, in agreement with previous work in this region [19,20], and at variance with the larger values found in Refs. [3,12,21]. The experimental method and results are introduced in Secs.…”

Z=50core stability inSn110from magnetic-moment and lifetime measurements

“…The reduced transition probability data in 104−134 Sn ( [1][2][3][4][5][6][7][8][9][10] and references therein), follow only above midshell (A = 116) the * Electronic address: kum@physics.rutgers.edu parabola-like curve of the shell model expectations [6]. For nuclei below midshell the B(E2) values are larger than expected but finally decrease at N = 54, as the doubly-closed shell Z = N = 50 is approached.…”

Nucleon pair approximation description of the low-lying structure of108,109Te and109I

“…There are no experimental data for the remaining orbitals. Their single-particle energies are extracted from a shell model calculation [34]. The proton singleparticle energies are taken to be the same as those for neutrons.…”