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- Banu, A, et al.
(författare)
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108Sn Studied with Intermediate-energy Coulomb Excitation
- 2005
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Ingår i: Physical Review C (Nuclear Physics). - 0556-2813. ; 72:6
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Tidskriftsartikel (refereegranskat)abstract
- The unstable neutron-deficient Sn-108 isotope has been studied in inverse kinematics by intermediate-energy Coulomb excitation using the RISING/FRS experimental setup at GSI. This is the highest Z nucleus studied so far with this method. Its reduced transition probability B (E2;0(g.s.)(+)-> 2(1)(+)) has been measured for the first time. The extracted B(E2) value of 0.230(57)e(2) b(2) has been determined relative to the known value in the stable Sn-112 isotope. The result is discussed in the framework of recent large-scale shell model calculations performed with realistic effective interactions. The roles of particle-hole excitations of the Sn-100 core and of the Z=50 shell gap for the E2 polarization are investigated.
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- du Rietz, Rickard, et al.
(författare)
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Investigation of High-spin States in 53Fe
- 2005
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Ingår i: Physical Review C (Nuclear Physics). - 0556-2813. ; 72:1
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Tidskriftsartikel (refereegranskat)abstract
- The fusion-evaporation reactions Si-28(S-32,1 alpha 2p1n)Fe-53 at 125 MeV and Mg-24(S-32,2p1n)Fe-53 at a 95-MeV beam energy were used to investigate excited states in Fe-53. The combination of the Gammasphere Ge detector array and ancillary devices led to the construction of an extensive level scheme comprising some 90 transitions connecting 40 states. The lifetime of the yrast 25/2(-) state and upper limits for the lifetimes of a number of additional states were determined using the Cologne plunger device coupled to the GASP gamma-ray spectrometer. The experimental results are compared to large-scale shell-model calculations using different sets of two-body matrix elements. In particular, predictions on electromagnetic decay properties such as lifetimes, branching ratios, and mixing ratios are studied in detail.
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| 3. |
- Morici, Andrea, et al.
(författare)
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A 3.6 mW 90 nm CMOS 2.4 GHz Receiver Front-End Design for IEEE 802.15.4 WSNs
- 2009
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Ingår i: ISSCS 2009. - New York : IEEE. - 9781424437849 ; , s. 77-80
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Konferensbidrag (refereegranskat)abstract
- In this paper a low-power design of an integrated RF receiver for Wireless Sensor Networks (WSNs) in 90nm CMOS technology is proposed. The receiver is IEEE 802.15.4 physical specifications compliant. It is designed to operate in ISM band at 2.45 GHz center frequency. Target devices for this kind of transceiver are low-cost battery powered smart embedded devices and sensors. The receiver is designed to reduce the count of external components in the final system, integrating on silicon the balun for single-ended to differential conversion. The receiver is composed of an inductorless Low Noise Amplifier (LNA), a buffer stage, I and Q passive mixers and Variable Gain Amplifiers (VGAs) that also act as second order filters. A novel integration of balun into the LNA is described. The system is designed to have direct conversion from RF to 6 MHz low-IF. Voltage supply is 1.2 V with a current consumption of 3 mA including necessary biasing networks, and the total power consumption is 3.6 mW. The complete voltage gain is more than 41.5 dB with a Noise Figure (NF) of 12.6 dB. The receiver layout exhibits an area of only 0.12 mm(2). Simulations are provided, including mismatch scenarios.
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| 7. |
- Nafari, A., et al.
(författare)
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MEMS Sensor for< emphasis emphasistype
- 2008
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Ingår i: Microelectromechanical Systems, Journal of. - Philadelphia : Institute of Physics (IOP). - 1057-7157. ; 17:2, s. 328-333
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Tidskriftsartikel (refereegranskat)abstract
- Here, we present a MEMS atomic force microscope sensor for use inside a transmission electron microscope ITEM). This enables direct in situ TEM force measurements in the nanonewton range and thus mechanical characterization of nanosized structures. The main design challenges of the system and sensor are to reach a high sensitivity and to make a compact design that allows the sensor to be fitted in the narrow dimensions of the pole gap inside the TEM. In order to miniaturize the sensing device, an integrated detection with piezoresistive elements arranged in a full Wheatstone bridge was used. Fabrication of the sensor was done using standard micromachining techniques, such as ion implantation, oxide growth and deep reactive ion etch. We also present in situ TEM force measurements on nanotubes, which demonstrate the ability to measure spring constants of nanoscale systems
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