Results of the search for inspiraling compact star binaries from TAMA300's observation in 2000-2004

We analyze the data of TAMA300 detector to search for gravitational waves from inspiraling compact star binaries with masses of the component stars in the range 1-3Msolar. In this analysis, 2705 hours of data, taken during the years 2000-2004, are used for the event search. We combine the results of different observation runs, and obtained a single upper limit on the rate of the coalescence of compact binaries in our Galaxy of 20 per year at a 90% confidence level. In this upper limit, the effect of various systematic errors such like the uncertainty of the background estimation and the calibration of the detector's sensitivity are included.Comment: 8 pages, 4 Postscript figures, uses revtex4.sty The author list was correcte

Observation results by the TAMA300 detector on gravitational wave bursts from stellar-core collapses

We present data-analysis schemes and results of observations with the TAMA300 gravitational-wave detector, targeting burst signals from stellar-core collapse events. In analyses for burst gravitational waves, the detection and fake-reduction schemes are different from well-investigated ones for a chirp-wave analysis, because precise waveform templates are not available. We used an excess-power filter for the extraction of gravitational-wave candidates, and developed two methods for the reduction of fake events caused by non-stationary noises of the detector. These analysis schemes were applied to real data from the TAMA300 interferometric gravitational wave detector. As a result, fake events were reduced by a factor of about 1000 in the best cases. The resultant event candidates were interpreted from an astronomical viewpoint. We set an upper limit of 2.2x10^3 events/sec on the burst gravitational-wave event rate in our Galaxy with a confidence level of 90%. This work sets a milestone and prospects on the search for burst gravitational waves, by establishing an analysis scheme for the observation data from an interferometric gravitational wave detector

Preliminary Results from a Multi-center Prospective Study (JROSG 05-5) on Postoperative Radiotherapy for Patients with High-risk Ductal Carcinoma in situ with Involved Margins or Margin Widths 1 mm or less than

Abstract Purpose: This prospective study aimed to evaluate the effectiveness of postoperative radiotherapy (PORT) consisting of whole breast irradiation followed by boost irradiation in patients with high-risk ductal carcinoma in situ (DCIS) with margin widths less than 1 mm. Materials and Methods: A multi-center phase II study (Japanese Radiation Oncology Study Group: JROSG 05-5) was conducted to evaluate the effectiveness of PORT. PORT consisted of whole breast irradiation (50 Gy/25 fractions) followed by boost irradiation (10 Gy/5 fractions) using electron beams for patients with high-risk DCIS. Eligibility criteria were as follows: 1) DCIS without an invasive carcinoma component, 2) age between 20 and 80 years, 3) involved margins or margin widths less than 1 mm, 4) refusal of re-resection, 5) performance status of 0−2, and 6) written informed consent. The primary endpoint was ipsilateral breast tumor recurrence (IBTR), and secondary endpoints were overall survival, relapse-free survival, recurrence patterns, and adverse events. Conclusions: Our preliminary results suggest that this PORT schedule may be promising for patients with high-risk DCIS. However, to make any definitive conclusions, a longer follow-up time is required