Positive parity levels in 36S observed in the 37Cl(d, 3He)36S reaction

Transition to the 36S ground state and excited states at 3.30, 4.57, 6.51, 7.11 and 7.69 MeV were observed in the reaction 37Cl(d, 3He)36S at a bombarding energy of 28.9 MeV. Using distorted wave analysis, l-values and strength coefficients C2S were extracted from the measured angular distributions. The results are in reasonable agreement with calculations by Glaudemans et al.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/33212/1/0000601.pd

Study of the structure of 36S and 38Ar

The 37Cl(d, 3He)36S and 39K(d, 3He)38 Ar reactions have been studied at a bombarding energy of 28.9 MeV. The results are compared with theoretical calculations for two or four holes in the sd-shell. The three-hole spectrum of 37Cl is also briefly discussed. In the calculation for 38Ar, additional states of a two-particle four-hole nature are included. In 38Ar, the ground state and levels at 2.166 and 7.14 MeV are excited principally by l = 2 transfer, while transitions with appreciable l = 0 strength are observed to levels at 3.935, 4.569, 5.158 and 5.563 MeV. This fragmentation is quite well reproduced by the inclusion of the 2p-4h states. In particular the level at 3.935 MeV is largely of this type, a conclusion supported by both the spectroscopic factors and [gamma] transition rates. The 36S ground state and levels at 6.511 and 7.12 MeV in 36S have angular distributions characteristic of l = 2. Three transitions with l = 0 strength are observed to levels at 3.295, 4.523 and 4.577 MeV in this nucleus. An additional level was identified at 7.71 MeV but the l-transfer could not be determined. The data are only qualitatively reproduced by the four-hole calculation, which while useful in making probable J[pi] assignments, suggests that core excitation is important here also.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/32822/1/0000196.pd

The University of Michigan neutron time-of-flight facility

The details of the neutron time-of-flight instrumentation associated with The University of Michigan 83" cyclotron are described and examples of capabilities of the instrument are given.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/22316/1/0000761.pd

Blueprint 2030: The Digital University in the Next Decade

In 2009, the original Blueprint for the Digital University set the stage for UC San Diego’s many accomplishments in cyberinfrastructure over the following decade. Many contemporary services and infrastructure used across campus have their origins in this document and subsequent projects. But research evolves, new needs arise, and new requirements are placed on researchers. Thus, campus leadership recognized the need for a new, updated Blueprint, helping point the way to the next generation of support.To compile this new Blueprint, the Research Computing and Data Services Governance Committee engaged in a multi-year process to obtain expert input into the future of research and research technology, including consulting a faculty advisory group, surveying campus faculty, engaging in in-depth interviews with UC San Diego administrators such as the Executive Vice Chancellor and Vice Chancellor for Research, and conducting faculty focus groups.This document outlines the priorities and directions our University must take to maximize new discoveries, increase funding, facilitate science, comply with regulatory demands and propel us forward in the decade to come.The themes described in this document come from trends in research processes and workflow, and are not specific to UC San Diego. This document is being shared publicly with the hope that it will be of assistance to other institutions facing similar generational evolution in both the conduct of research and in their research support infrastructure

Neutron Radiography with SNRS

The Stationary Neutron Radiography System (SNRS) is a real-time neutron radiography system nearing completion at McClellan Air Force Base, Sacramento, CA. SNRS will be used for the inspection of F-111 aircraft components for corrosion. General Atomics is the prime contractor providing the TRIGA reactor and the building and SAIC is a subcontractor providing the robotics, image acquisition and analysis and part of the reactor shielding.</p

Added precision in 57Fe Mossbauer spectroscopy

This paper contains (1) the necessary mathematics for a precise interpretation of Mossbauer data, and (2) a characterization of a spectrometer designed specifically to maximize the information avalable from these data. The innovative aspects of this spectrometer are that it provides a known absorber lineshape, that it is quantitative, and that is provides information of the vibrational states of the absorber via the second order Doppler shift vs temperature and the total absorption vs temperature. The spectrometer allows sample temperature and applied magnetic field to be varied in any combination of 2-350 K or 0-6 T, respectively. Simultaneous collection of four data streams allows an accurate representation of the transmission spectrum. Sophisticated computer treatment with extensive use of least squares fitting procedures and fast Fourier transform techniques provides the final output display of sample cross-section vs standardized source velocity. The cross-section display is shown to be independent of the thickness of samples with Mossbauer optical densities up to 3. In addition, we report the method and results of measurements which must precede the operation of the spectrometer: (1) the absorption coefficient of iron at 14 keV: (498+/-7)cm-1, (2) the Debye temperature of our source (57Co in rhodium matrix): (361+/-20)K, (3) the source lineshape: three Lorentzians with Heisenberg linewidth, a center line with twice the intensity of the symmetrically placed outer lines which are spaced 0.055 mm/s apart, (4) the Mossbauer effect cross-section for 57Fe: (2.4+/-0.2) x 10-18 cm2, (5) the Debye temperature of iron (NBS # 1541): (430+/-30) K, and (6) the values for the Hamiltonian parameters of iron metal (NBS # 1541) at 290, 101 and 4.2 K. The precision of the determined Hamiltonian parameters is defined in terms of a statistic with a weighted [chi]2 distribution.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/22843/1/0000403.pd